7526A Precision Process Calibrator Users Manual July 2012 © 2012 Fluke Corporation. All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies.
LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days.
Table of Contents Chapter 1 Title Introduction ......................................................................................... 1-1 Introduction ........................................................................................................ Contact Fluke Calibration .................................................................................. Safety Information ............................................................................................. Unpack the Product .........
7526A Users Manual Resistance Temperature Detector (RTD) and Ohms Measure........................... Resistance Temperature Detector (RTD) and Ohms Source ............................. Resistance Temperature Detector (RTD) with Custom Coefficients ................. Standard Platinum Resistance Thermometer (SPRT) Coefficients ................... Thermocouple (TC) Measure ............................................................................. Thermocouple (TC) Source ...................................
Contents (continued) 7 Maintenance ......................................................................................... 7-1 Introduction ........................................................................................................ Clean the Calibrator ........................................................................................... Replace a Line Fuse ........................................................................................... Change the Line Voltage ..............
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List of Tables Table 1-1. 1-2. 1-3. 2-1. 2-2. 2-3. 2-4. 5-1. 5-2. 5-3. 5-4. 5-5. 5-6. 5-7. 5-8. 6-1. 6-2. 6-3. 6-4. 6-5. 6-6. 6-7. 7-1. Title Symbols .................................................................................................................. Error Messages ....................................................................................................... Line-Voltage Settings.............................................................................................
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List of Figures Figure 1-1. 1-2. 1-3. 1-4. 1-5. 1-6. 1-7. 1-8. 1-9. 2-1. 2-2. 2-3. 2-4. 2-5. 2-6. 2-7. 3-1. 3-2. 3-3. 3-4. 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 4-7. 4-8. 4-9. 4-10. 4-11. 4-12. 4-13. 5-1. 5-2. Title Front Panel ............................................................................................................. Primary Input/Output Terminals ............................................................................ Primary Input/Output Display and Controls ..............................
7526A Users Manual 5-3. 5-4. IEEE-488 (GPIB) Remote Connection .................................................................. 5-6 Status Register Overview .......................................................................................
Chapter 1 Introduction Title Introduction .......................................................................................................... Contact Fluke Calibration .................................................................................... Safety Information ............................................................................................... Unpack the Product .............................................................................................. Standard Equipment ..
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Introduction Introduction 1 Introduction The Fluke 7526A Precision Process Calibrator (the “Product” or “Calibrator”) is an accurate, full-featured temperature, pressure, and DC calibrator. The Calibrator is meant for research and development, manufacturing, and calibration lab procedures. The Product operation is easy and you will quickly understand its operations and features.
7526A Users Manual Safety Information A Warning identifies conditions and procedures that are dangerous to the user; A Caution identifies conditions and procedures that could cause Product damage, equipment under test damage, or permanent loss of data. XWWarnings To prevent possible electrical shock, fire, or personal injury: 1-4 • Read all safety Information before you use the Product. • Carefully read all instructions.
Introduction Unpack the Product 1 Table 1-1 shows the symbols used on the Product and in this manual. Table 1-1. Symbols Symbol Definition Symbol Definition This product complies with the WEEE Directive (2002/96/EC) marking requirements. The affixed label indicates that you must not discard this electrical/electronic product in domestic household waste.
7526A Users Manual Standard Equipment Make sure the basic Calibrator package is complete. It includes: • The Calibrator • Users Manual CD-ROM • Getting Started • AC Mains Cord • Thermocouple Shorting Jumper • NIST Traceable Calibration Report • USB to Serial Adapter Cable. Options and Accessories For more information about these accessories and their prices, contact your Fluke representative.
Introduction Product Description 1 Product Description This section is a general description of the Product. Front-Panel Overview Figure 1-1 shows the layout of the front panel. Each of the three primary divisions is given in the subsequent sections.
7526A Users Manual Primary Input/Output Terminals Figure 1-2 shows the primary input/output terminals. 2 7526A PRECISION PROCESS CALIBRATOR mA VOLTS RTD/ 100 mA MAX 1 3 OUTPUT HI HI LO LO OUTPUT 100 V MAX TC INPUT/OUTPUT 100V PK MAX 4 4 W RTD/ INPUT HI CURRENT 20 V PK MAX SENSE LO 20 V PK MAX 5 6 gwp002.
Introduction Product Description 1 Primary Input/Output Display and Controls Figure 1-3 shows the primary input/output display and controls. 1 ZERO OUTPUT INPUT 7 8 9 DISPLAY CJC C/ F 4 5 6 SET RECALL AUTOSET 1 2 3 RNG LOCK LOCAL EXP 0 2 VOLTS mA STBY OPR TC RTD TYPE UNITS SHIFT ENTER CE 3 4 gwp003.eps Item Description Display: A two-line, 16-character display that gives all visual user feedback for the primary output and input operations.
7526A Users Manual Item Description Numeric and Secondary Function Keys: Output value data entry keys. Secondary function selection per the text printed above the numeric key. Push and then the numeric key to select the function. °C/°F SET RECALL AUTOSET Select Celsius or Fahrenheit units for RTD and Thermocouple temperature measurements. Set a new value for a preset output setpoint as given in Chapter 3, “Output Setpoints”.
Introduction Product Description 1 Function Keys For all but Thermocouple output modes, toggle between Standby and Operate modes. In Standby mode, changes to the output value in the display is not applied to the terminals until you select the Operate mode. In Operate mode, each change to the output value in the display is applied to the terminals immediately. Voltages more than 30 V are not applied to the terminals and the mode automatically reverts to Standby for your safety.
7526A Users Manual Isolated Input Display, Controls, and Terminals Figure 1-4 shows the isolated input display, controls, and terminals. 1 VOLTS mA LOOP PWR Press and Hold for Switch Test Switch Test Reset 2 HART HI INPUT 3 LO 100 V PK MAX gwp004.eps Item Name Display Description A two-line, 16-character display gives all visual user feedback for the isolated input operations.
Introduction Product Description Item Name Description Selects Pressure input mode. Subsequent pushes of this key cycle through the pressure units. Pressure input mode uses the pressure module connector on the primary input/output side. Each side can use pressure mode at the same time and can be set to show the same pressure measurement in different units if necessary. Input Terminals [1,2] 1 Common input terminals for dc voltage and current.
7526A Users Manual Display Layouts Figure 1-6 shows the primary voltage and current display. 1 2 3 4 5 gwp006.eps Item Description Operation mode: AUTO Auto-range LOCK Range lock rem Remote operation SP # Automatic stepping of preset setpoints Current range and output mode Output condition: Stby Standby, terminals inactive Operating, terminals are active with output that refers to the shown value. Output value Units Figure 1-6.
Introduction Product Description 1 Figure 1-7 shows the primary thermocouple and RTD display. 1 2 3 4 5 6 gwp007.
7526A Users Manual Figure 1-8 shows the primary and isolated pressure display. 1 2 gwp008.eps Item Description On the primary display, rem is shown to the left during remote operation. Input value Figure 1-8. Primary and Isolated Pressure Display Figure 1-9 shows the isolated voltage and current display. 1 2 3 gwp009.
Introduction Set Up 1 Error Messages Table 1-2 shows the error messages that can appear on the displays. Table 1-2. Error Messages Message OVER RANGE Description The numeric keypad value is larger than the range of the output mode selected. OVER LOAD For dc voltage output mode, the current necessary to make the output is larger than the Product specifications. For dc current mode, the resistance of the circuit is larger than the Product specifications.
7526A Users Manual 3. When the line voltage is correctly set, make sure that the power switch is off and connect the mains power cord to the Product. See the “Rear Panel” section of this chapter, for the location. 4. Turn on the Product with the rear-panel rocker switch. The Product will power up in a few seconds. It briefly shows the model number and firmware version in the primary display before it changes to the correct input/output display.
Introduction Specifications 1 DC Voltage Specifications, Output Ranges Absolute Uncertainty tcal ± 5°C, ±(ppm of output +µV) [1] 90 Days Stability 24 hours, ±1 °C ±(ppm of output +μV) 1 Year Resolution Maximum [2] Burden 0 mV to 100.000 mV 25 3 30 3 5 ppm + 2 μV 1 μV 10 mA 0 V to 1.00000 V 25 10 30 10 4 ppm + 10 μV 10 μV 10 mA 0 V to 10.0000 V 25 100 30 25 1 mV 100 4 ppm + 100 μV 30 1 mV 5 ppm + 1 mV TC Output and Input 100 μV 1 mV 10 mA 0 V to 100.000 V -10 to 75.
7526A Users Manual Resistance Specifications, Output Ranges Absolute Uncertainty, tcal ±5 °C, ± Ohms Resolution Nominal Current 90 Days 1 Year 5 Ω to 400.000 Ω 0.012 0.015 0.001 Ω 1 to 3 mA 5 kΩ to 4.00000 kΩ 0.25 0.3 0.01 Ω 100 μA to 1 mA [1] [1] For currents lower than shown, the specification becomes New Spec. = Stated Spec. x Imin/Iactual. For example, a 500 μA stimulus that measures 100 Ω has a specification of: 0.015 Ω x 1 mA/500 μA=0.
Introduction Specifications 1 Thermocouple Specification, Output and Input Absolute Uncertainty, tcal ±5 °C, ±(°C) Range (°C) TC Type Minimum [1] Output/Input 90 days 1 Year B 600 °C 800 °C 1550 °C 800 °C 1550 °C 1820 °C Maximum 0.35 °C 0.28 °C 0.21 °C 0.35 °C 0.28 °C 0.22 °C C 0 °C 1000 °C 1800 °C 2000 °C 1000 °C 1800 °C 2000 °C 2316 °C 0.15 °C 0.22 °C 0.24 °C 0.32 °C 0.16 °C 0.23 °C 0.26 °C 0.35 °C E -250 °C -200 °C -100 °C 0 °C 600 °C -200 °C -100 °C 0 °C 600 °C 1000 °C 0.24 °C 0.
7526A Users Manual TC Type Minimum [1] Absolute Uncertainty, tcal ±5 °C, ±(°C) Range (°C) [1] Output/Input Maximum 90 days 1 Year T -250 °C -200 °C -100 °C 0 °C 200 °C -200 °C -100 °C 0 °C 200 °C 400 °C 0.34 °C 0.14 °C 0.09 °C 0.07 °C 0.06 °C 0.35 °C 0.16 °C 0.11 °C 0.09 °C 0.09 °C U -200 °C 0 °C 200 °C 0 °C 200 °C 600 °C 0.15 °C 0.08 °C 0.07 °C 0.16 °C 0.10 °C 0.10 °C XK -200 °C -100 °C 0 °C 600 °C -100 °C 0 °C 600 °C 800 °C 0.10 °C 0.07 °C 0.06 °C 0.07 °C 0.11 °C 0.09 °C 0.08 °C 0.
Introduction Specifications 1 RTD and Thermistor Specification, Input Absolute Uncertainty, tcal ±5 °C, ±(°C) Range (°C) RTD Type Output/Input Minimum Maximum 90 Days 1 Year -200 °C -80 °C 100 °C 300 °C 400 °C 630 °C -80 °C 100 °C 300 °C 400 °C 630 °C 800 °C 0.012 °C 0.018 °C 0.022 °C 0.025 °C 0.031 °C 0.037 °C 0.013 °C 0.020 °C 0.024 °C 0.026 °C 0.033 °C 0.038 °C Pt 3926, 100 Ω -200 °C -80 °C 0 °C 100 °C 200 °C 400 °C -80 °C 0 °C 100 °C 300 °C 400 °C 630 °C 0.012 °C 0.014 °C 0.016 °C 0.
7526A Users Manual Pressure Measurement Specifications The Calibrator can accept the Fluke 700 or 525A-P Series pressure modules. Pressure modules connect directly into the front panel Lemo connector with the Calibrator firmware auto-detecting the type and value of the module you connect.
Chapter 2 Primary Inputs and Outputs Title Page Introduction .......................................................................................................... 2-3 DC Voltage Output .............................................................................................. 2-3 DC Current Output............................................................................................... 2-4 Resistance Temperature Detector (RTD) and Ohms Measure.............................
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Primary Inputs and Outputs Introduction 2 Introduction This chapter explains the main (primary) inputs and outputs of the Product. Connection figures are also shown so that you properly connect the Product to a unit under test (UUT). DC Voltage Output The Product can source dc voltages from 0 V to 100 V and uses these four ranges for maximum accuracy: • 0.1 V • 1V • 10 V • 100 V For dc voltage output: 1. Disconnect test leads from external devices. 2.
7526A Users Manual Notes Scrolling the output when the output value is already larger than 30 V will not place the Calibrator in standby mode for each new value. Automatic setpoints higher than 30 V will not put the Calibrator in standby mode for each new value. 9. The Product can be locked to a specified voltage range. Select a value in that range and then push and + to select the secondary RNG LOCK function. DC Current Output The Product can source dc current from 0 mA to 100 mA. 1.
Primary Inputs and Outputs Resistance Temperature Detector (RTD) and Ohms Measure 2 Resistance Temperature Detector (RTD) and Ohms Measure The Product can measure all common RTD types, 5 custom RTD curves, and a custom SPRT in °F or °C, plus basic resistance from 0 Ω to 4000 Ω. The Product uses these common RTD types: • Pt 385 100 Ω, 200 Ω, 500 Ω, 1000 Ω • Pt 3926 100 Ω • Pt 3916 (JIS) 100 Ω • Ni120 120 Ω • Cu 427 (Minco) 10 Ω • YSI 400 Disconnect test leads from external devices. 1.
7526A Users Manual To zero a RTD resistance circuit: • Select the RTD measure function as in the “Resistance Temperature Detector (RTD) and Ohms Measure” and “Resistance Temperature Detector (RTD) and Ohms Source” sections of this chapter and push until the low or high ohms range is selected. • Short the RTD/Ω terminals with the test leads normally used for RTD/Ω measurements. • It is necessary for the test leads and terminals to stabilize to the same temperature.
Primary Inputs and Outputs Resistance Temperature Detector (RTD) with Custom Coefficients 2 6. Push and to toggle the RTD display between °F and °C. 7. Use the numeric keypad to type the necessary output value and push E. 10. As an alternative, use M or to select a digit to change, followed by or P to ramp the digit up or down. This method gives you a simple solution when small changes to an output value are necessary, or if is necessary to increment or decrement decades.
7526A Users Manual 6. To use a different custom RTD curve, push two times to show the USR_DEF selection prompt. The USR_DEF function of the Product uses the Callendar-Van Dusen equation to source and measure custom RTD's. The C coefficient is only used for the subrange -260 °C to 0 °C. Only the A and B coefficients are necessary for the subrange 0 °C to 630 °C. The R0 value is the resistance of the probe at 0 °C. All five of the custom RTD curves are set to PT385 at the factory, as shown in Table 2-1.
Primary Inputs and Outputs Thermocouple (TC) Measure 2 custom SPRT, and push E . 7. At the "ENTER RTPW" prompt, key in the nominal resistance value (RTPW) for the custom SPRT, and push E. 8. At the "ENTER COEFF A" prompt, key in the first (A) deviation coefficient for the custom SPRT, and push E . To key in a coefficient that includes an exponent, key in the mantissa, push E and . to select the EXP function, key in the exponent, and push E. 9.
7526A Users Manual 4. Push to select the necessary thermocouple type or the millivolt range. 5. Connect the UUT to the thermocouple terminals of the Product with a standard TC miniplug as shown in Figure 2-5. One pin is wider than the other. Do not push the plug into the incorrect polarization. The TC wire used for the connection must agree with the thermocouple type selected for correct cold junction compensation. It is necessary for the miniplug and terminals to stabilize to the same temperature.
Primary Inputs and Outputs Thermocouple (TC) Source 2 Thermocouple (TC) Source The Product can source all common thermocouple types in °F or °C, plus basic millivolts from -10.0 mV to 75.0 mV. The following common thermocouple types are supported: • B • C • E • J • K • L • N • R • S • T • U • XK • BP 1. Disconnect test leads from external devices. 2. Push to select thermocouple and RTD/Ω mode, if not already selected.
7526A Users Manual 6. Push and to toggle the thermocouple display between °F and °C. 7. Push and to toggle the cold junction compensation between the internal temperature sensor and an external reference. 8. Use the numeric keypad to type the necessary output value and push E. 9. As an alternative, use M or to select a digit to change, followed by or P to ramp the digit up or down.
Primary Inputs and Outputs Pressure Measure 2 Pressure modules that can be used with the Product are listed in Tables 2-3 and 2-4. Table 2-3.
7526A Users Manual Table 2-4.
Chapter 3 Isolated Inputs Title Page Voltage Input ....................................................................................................... 3-3 Current Input ........................................................................................................ 3-3 Pressure Input ...................................................................................................... 3-4 Switch Test ............................................................................................
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Isolated Inputs Voltage Input 3 Voltage Input The Product can measure dc voltages from 0 V to 100 V. Use these ranges for maximum accuracy: 10 V and 100 V. 1. Disconnect test leads from external devices. 2. Push to select isolated dc voltage and current input mode, if not already selected. If the necessary dc voltage mode is not shown, push again to cycle to the necessary dc voltage mode. 3.
7526A Users Manual push L to turn on the Product internal 24 V supply in series with the current measuring circuit. The top line changes to 24mA LPWR to show that the supply is on. Push L again to turn off the supply and the top line reverts to 50mA RANGE. 5. If a 250 Ω resistor is necessary during a HART calibration procedure, push to switch in the Product internal 250 Ω resistor. HART is added to the top line of the display to show that the resistor is turned on in the circuit.
Isolated Inputs Switch Test 3 Switch Test When in Switch Test mode the Calibrator can sense a contact transition (closed or opened). At the time of the transition the Calibrator records the value and units shown on the primary display. This means that a switch test can be done in all modes, read or source. After two transitions the Calibrator changes to recall mode. In recall mode, the value of the first transition, second transition, and the calculated deadband of the switch can be seen on the display.
7526A Users Manual After the second contact transition, the switch opens. After the second contact transition, the Calibrator enters the recall mode: gwp035.eps 2. Push . gwp038.eps 3. Push . gwp039.eps When necessary, push L to reset the switch test. Hold down for 3 seconds to put the Calibrator into the isolated input mode that was selected before.
Isolated Inputs Output Setpoints 3 To recall a setpoint: 1. Select the output mode. 2. Push and to select the RECALL function. 3. At the setpoint number selection prompt "RECALL SPT#", push the numeric key, 1 to 9, for the setpoint to be recalled. To start an automatic setpoint cycle: 1. Select the output mode. 2. Push and to select the AUTOSET function. 3. At the end setpoint number selection prompt "AUTO SET POINT", push the numeric key, 1 to 9, for the end setpoint number for the cycle. 4.
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Chapter 4 Application Notes Title Introduction .......................................................................................................... P/I Transmitter ..................................................................................................... I/P Transmitter ..................................................................................................... V/I Transmitter ....................................................................................................
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Application Notes Introduction 4 Introduction This chapter includes application notes that will help you to understand how to better use the Product under different situations. P/I Transmitter 1. Disconnect test leads from external devices. 2. Select pressure input on the primary display as given in the “Pressure Measure” section of Chapter 4. 3. Select current input on the isolated display as given in the “Current Input” section of Chapter 5. Select isolated loop power.
7526A Users Manual I/P Transmitter 1. Disconnect test leads from external devices. 2. Select current output on the primary display as given in the “DC Current Output” section of Chapter 4. 3. Select pressure input on the isolated display as given in the “Pressure Input” section of Chapter 5. 4. Connect the transmitter as shown in Figure 4-2. 5. To verify and calibrate the transmitter, refer to the transmitter documentation.
Application Notes V/I Transmitter 4 V/I Transmitter 1. Disconnect test leads from external devices. 2. Select voltage output on the primary display as given in the “DC Voltage Output” section of Chapter 4. 3. Select current input on the isolated display as given in the “Current Input” section of Chapter 5. Select the isolated loop power option. 4. Connect the transmitter as shown in Figure 4-3. 5. To verify and calibrate the transmitter, refer to the transmitter documentation.
7526A Users Manual RTD Test 1. Disconnect test leads from external devices. 2. Select RTD input on the primary display as given in the “Resistance Temperature Detector (RTD) and Ohms Measure” section of Chapter 4. 3. Select the correct RTD type. 4. Connect the RTD as shown in Figure 4-4. 5. To verify the RTD, refer to the RTD documentation.
Application Notes RTD Transmitter 4 RTD Transmitter 1. Disconnect test leads from external devices. 2. Select RTD output on the primary display as given in the “Resistance Temperature Detector (RTD) and Ohms Source” section of Chapter 4. 3. Select the correct RTD type. 4. Select current input on the isolated display as given in the “Current Input” section in Chapter 5. 5. Select the isolated loop power option. If a HART communicator will be used for setup of the transmitter, select HART. 6.
7526A Users Manual Thermocouple Test 1. Disconnect test leads from external devices. 2. Select thermocouple input on the primary display as given in the “Thermocouple (TC) Measure” section in Chapter 4. 3. Select the correct thermocouple type. 4. Connect the thermocouple as shown in Figure 4-6. 5. To verify the thermocouple, refer to the thermocouple documentation.
Application Notes Thermocouple Transmitter 4 Thermocouple Transmitter 1. Disconnect test leads from external devices. 2. Select thermocouple output on the primary display as given in the “Thermocouple (TC) Source” section of Chapter 4. 3. Select the correct thermocouple type for the transmitter. 4. Select current input on the isolated display as given in the “Current Input” section of Chapter 5. 5. Select the isolated loop power option.
7526A Users Manual RTD Indicator 1. Disconnect test leads from external devices. 2. Select RTD output on the primary display as given in the “Resistance Temperature Detector (RTD) and Ohms Source” section of Chapter 4. 3. Select the correct RTD type for the indicator. 4. Connect the indicator as shown in Figure 4-8. 5. To verify and calibrate the indicator, refer to the indicator documentation. RTD/ HI 1 2 3 1 2 3 4 2 Wire RTD Indicator 135.78 C 3 Wire RTD Indicator 135.
Application Notes Thermocouple Transmitter 4 Precision Current Trip 1. Disconnect test leads from external devices. 2. Select current output on the primary display as given in the “DC Current Output” section of Chapter 4. 3. Select voltage input on the isolated display as given in the “Voltage Input” section in Chapter 5. 4. Connect the trip as shown in Figure 4-9. 5. To verify and calibrate the trip, refer to the trip documentation.
7526A Users Manual I/I Isolator/Transmitter 1. Disconnect test leads from external devices. 2. Select current output on the primary display as given in the “DC Current Output” section of Chapter 4. 3. Select current input on the isolated display as given in the “Current Input” section of Chapter 5. 4. Select the isolated loop power option. 5. Connect the transmitter as shown in Figure 4-10. 6. To verify and calibrate the transmitter, refer to the transmitter documentation.
Application Notes Thermocouple Transmitter 4 Precision Temperature Measurement with Probe 1. With the probe and the custom coefficients that go with the probe, the total system error is 0.03 °C. 2. Disconnect test leads from external devices. 3. Select RTD input on the primary given as given in the “Resistance Temperature Detector (RTD) and Ohms Measure” section of Chapter 4. 4. Select the user-defined curve with the custom coefficients for the probe.
7526A Users Manual Temperature Switch Test To do a temperature switch test, see Figure 4-12 for the necessary connections and do the subsequent steps.
Application Notes Thermocouple Transmitter 4 1. To go to the switch test mode, push and hold for three seconds. 2. Connect the Calibrator to the switch with the isolated terminals. The polarity of the terminals is not important. 3. The top of the isolated display will read “CLOSE”: gwp060.eps 4. Increase the temperature slowly until the switch opens. 5. When the switch opens, “OPEN” will be shown. Decrease the temperature slowly until the switch closes: gwp061.eps 6.
7526A Users Manual Note The last example uses a normally closed switch. The basic procedure is the same for a normally open switch, but the display will read “OPEN” as an alternative to “CLOSE”. Pressure Switch Test The connections for this test are shown in Figure 4-13.
Application Notes Thermocouple Transmitter 4 To do the pressure switch test: 1. To go to the switch test mode, push and hold for 3 seconds. 2. Connect the Calibrator to the switch. Use the isolated terminals. The polarity of the terminals is not important. 3. Connect the pump to the Calibrator and the pressure switch. Make sure the vent on the pump is open. 4. Zero the Calibrator if necessary. 5. Close the vent after you zero the Calibrator. 6. The top of the isolated display will read “CLOSE”. gwp065.
7526A Users Manual 10. Push the “NEXT” option to see when the switch closed, and the deadband. wp068.eps gwp069.eps Note The previous example uses a normally closed switch. The basic procedure is the same for a normally open switch but the display will show “OPEN” as an alternative to “CLOSE”.
Chapter 5 LCD and Remote Interface Setup Procedures Title Page Introduction .......................................................................................................... 5-3 Access LCD and Remote Interface Setup Procedures ......................................... 5-3 Remote Interface .................................................................................................. 5-3 Set Up the RS-232 Port for Remote Control ...................................................
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LCD and Remote Interface Setup Procedures Introduction 5 Introduction This chapter tells you how to set up and use the Remote Interface. It also explains the IEEE-488 interface and gives a listing of remote commands and their functions. Access LCD and Remote Interface Setup Procedures To access LCD and Remote Interface setup procedures: 1. Push and to select the SETUP function. 2. At the "LCD CONTRAST" prompt, push or P to adjust the LCD contrast. 3. Push E. 4.
7526A Users Manual Set Up the RS-232 Port for Remote Control The Product is programmable with a standard RS-232 connection with a PC. The RS-232 cable for the port must be shorter than 15 meters (50 feet). Longer cables are permitted if the load capacitance measured at a connection point (including signal terminator) is not larger than 2500 pF.
LCD and Remote Interface Setup Procedures Remote Interface 5 Use with Computer USB Ports The Product can be used with a computer USB ports with a USB to serial converter. Fluke can supply the equipment for this connection: • 80313, Cable, USB to serial adapter • 80157, Cable, Null modem, RS-232 See Figure 5-2 for connections. IEEE Port IEEE-488 Cable IEEE-48 Port 7526A Calibrator UUT Controller Figure 5-2. RS-232 Remote Connection gwp032.
7526A M E EX E D D E Q YE 0 O PC C PO N 0 Users Manual 7 6 5 4 3 2 1 0 Event Status Register Data Available? Read using *ESR? Logical OR & & & Output Buffer & & & & & 7 6 5 4 3 2 1 0 Event Status EnableRegister Read using *ESE? Write using *ESE Error Available? Error Queue Read using ERR? Read by Serial Poll RQS Service Request Generation 0 6 ESB MAV EAV 0 0 0 SRQ on IEEE bus Logical OR MSS & Status Byte Register Read using *STB? & & & & & & 7 6 5 4 3 2 1 0 Service Requ
LCD and Remote Interface Setup Procedures IEEE-488 Interface Overview 5 Table 5-1 gives the possible operation state transitions. For more information about IEEE-488 GPIB messages, see the “IEEE-488 Interface Overview” section of this chapter. Table 5-1.
7526A Users Manual Command Use Communications between the controller and the Product use commands, queries, and interface messages. Although the commands use the 488.2 standard as their basis, they can be used on the IEEE-488 or RS-232 interface. There are some special RS-232 only commands as shown in the section “Commands for RS-232 Only”. For more information on IEEE command structures, see the IEEE 488.2 standard. See Chapter 6 for more information about the commands referenced in this section.
LCD and Remote Interface Setup Procedures Command Use 5 4. Compound Commands A compound command is two or more commands put on one command line isolated from each other with semicolons. For example, the subsequent two individual commands: OUT 1 V OPER can be mixed into the compound command: OUT 1 V; OPER These commands tell the Product to source 1 V dc, and then go into operate mode. 5.
7526A Users Manual Table 5-3. Commands for RS-232 Only IEEE-488 Message RS-232 Equivalent GTL LOCAL command GTR REMOTE command LLO LOCKOUT command 8. Commands for IEEE-488 These are all of the commands but those used for RS-232 only, as shown above. All commands are moved through the IEEE-488 as data, but the commands LOCAL, REMOTE, and LOCKOUT, which are done per the IEEE Standards as uniline messages.
LCD and Remote Interface Setup Procedures Command Use 5 Table 5-4.
7526A Users Manual 3. More Space or Tab Characters In the command descriptions, parameters are shown isolated by spaces. One space after a command is necessary (unless no parameters are necessary). All other spaces are optional. Spaces are put in for clarity in the manual and can be left in or left out as necessary. You can put more spaces or tabs between parameters as necessary. More spaces in a parameter are typically not permitted.
LCD and Remote Interface Setup Procedures Command Use 5 6. Response Message Syntax In the complete command descriptions in Chapter 6, the responses from the Product are given where applicable. To know what type of data to read in, refer to the start of the response description for the command. M E EX E D D E Q YE 0 O PC C PO N 0 Check Product Status Figure 5-4 shows the status registers, enable registers, and queues in the Product which show different conditions in the Product.
7526A Users Manual 1. Serial Poll Status Byte (STB) The Calibrator sends the serial poll status byte (STB) when it answers to a serial poll. This byte is set to 0 when the power is turned on. The STB byte structure is shown in Table 5-7. Refer to the *STB? command in Chapter 6 for more information on how to read this register. Table 5-7. Serial Poll Status Byte (STB) and Service Request Enable (SRE) Registers 7 0 6 RQS MSS 5 4 3 2 1 0 ESB MAV EAV 0 0 0 RQS Requesting Service.
LCD and Remote Interface Setup Procedures Command Use 5 5. Event Status Register (ESR) The Event Status Register is a two-byte register in which the higher eight bits are always 0, and the lower eight bits show different conditions of the Product. The ESR is cleared (set to 0) when the power is turned on, and each time it is read. Parameters are necessary for many of the remote commands. Incorrect parameter use causes command errors to occur.
7526A Users Manual characters. The controller reads it with a statement such as a BASIC INPUT statement. What is read is removed from the queue. If the queue is empty, the Product does not answer to the INPUT statement from the controller. The Message Available (MAV) bit in the Serial Poll Status Byte is 1 if there is something in the output queue and 0 if the output queue is empty. 10.
Chapter 6 Remote Commands Title Page Introduction .......................................................................................................... 6-3 Command Summary by Function ........................................................................ 6-3 Error Code List .................................................................................................... 6-6 Remote Command List ........................................................................................
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Remote Commands Introduction 6 Introduction Remote commands duplicate actions that can be started from the front panel in local operation mode. After the summary table is a complete alphabetical list of all commands complete with protocol information. Headings in the alphabetical list give the parameters and responses, plus an example for each command. For information on how to use the commands, see Chapter 5. Command Summary by Function See the subsequent tables for command summary function information.
7526A Users Manual Table 6-2. External Connection Commands Command Description FUNC? Shows the current output, measurement, or calibration function selected on the isolated and primary displays, in that sequence. HART? Shows the HART resistor setting for the isolated milliamp range, ON or OFF. HART_OFF Turns off the HART resistor on the isolated milliamp range. HART_ON Turns on the HART resistor on the isolated milliamp range. ISO_PRES_UNIT Sets the isolated display pressure units.
Remote Commands Command Summary by Function 6 Table 6-4. Measurement Commands Command Description ISO_MEAS Sets the isolated input measurement type. PRES? Queries the connected pressure module for its manufacturer and serial number. PRES_MEAS Changes the operation mode of the primary display to pressure measurement. RTD_MEAS Changes the operation mode to RTD measurement. ST_START Puts the Calibrator in switch test mode and/or starts a new switch test.
7526A Users Manual Error Code List Table 6-7 is list of error codes for the Product. Table 6-7. Error Code List Error Number 6-6 Message Class Description 1 DDE Error queue overflow. 100 EXE OPER or STBY was received when the Calibrator is in measure mode or thermocouple source mode. 101 CME A non-numeric entry was received in a field that must contain a numeric entry. 102 EXE The numeric field is more than 10 characters. 103 CME incorrect units name or prefix.
Remote Commands Remote Command List 6 Table 6-7. Error Code List (cont.) Error Number Message Class Description 118 CME An incorrect parameter was received. 120 EXE The serial input buffer overflowed. 121 EXE The command string buffer overflowed. 122 QYE The serial output buffer overflowed. 123 DDE The output overloaded. See display error message OVER LOAD in Chapter 1. 124 DDE The Calibrator is out of tolerance.
7526A Users Manual * ESE? Event Status Enable query. This command shows the contents of the Event Status Enable (ESE) register. See the Event Status Enable Register (ESE) description in the “Check Product Status” section of Chapter 5. Parameter: Response: where is the decimal equivalent of the ESE byte, 0 to 255 Example: *ESE? 133 This example shows decimal 133 (binary 10000101) which shows that bits 7 (PON), 2 (QYE), 1 (OPC) are enabled. * ESR? Event Status Register query.
Remote Commands Remote Command List 6 FAULT? This command shows the most recent error code from the error queue. If the queue is empty (no errors have occurred) it shows 0. The command is typically used to verify that the prior command did what it was intended to do. Parameter: Response: where is one of the error codes documented in Chapter 6.
7526A Users Manual HART? This command shows the isolated DC current input HART resistor status. Parameter: Response: where is ON or OFF Example: HART? OFF This example is an indication that the isolated DC current input HART resistor is turned off. HART_OFF This command disables the isolated DC current input HART resistor. Parameter: Response: Example: HART_OFF This example disables the isolated DC current input HART resistor.
Remote Commands Remote Command List 6 *IDN? This command shows the unit identification: instrument manufacturer, model number, serial number, and firmware revision level. Parameter: Response: where contains the subsequent four fields separated by commas: 1. Manufacturer 2. Model number 3. Serial number (always 0) 4. Firmware revision level Example: *IDN? FLUKE, Calibrator,0,1.
7526A Users Manual ISO_PRES_UNIT This command sets the isolated pressure unit.
Remote Commands Remote Command List 6 ISO_PRES_UNIT? This command shows the isolated pressure unit.
7526A Users Manual LOCKOUT This command puts the Calibrator into the lockout condition when in remote control (see the REMOTE command). In this condition, no local operation is permitted at the front panel. This includes the LOCAL key. To clear the lockout condition, use the LOCAL command. This command duplicates the IEEE-488 LLO (Local Lockout) message. Parameter: Response: Example: LOCKOUT This example puts the instrument into the lockout condition. No front panel controls can be used.
Remote Commands Remote Command List 6 *OPC Operations Complete command. This command sets bit 0 (OPC) of the Event Status Register to 1 when all pending device operations are complete. Also see the *ESR? command. Parameter: Response: Example: *OPC This example sets bit 0 of the Event Status Register to 1 when all pending device operations are done. *OPC? Operations Complete query. This command shows a 1 after all pending Calibrator operations are complete.
7526A Users Manual OPER? This command shows the current operate/standby mode setting. Parameter: Response: where is "1" for operate mode and "0" for standby mode Example: OPER? 1 This example is an indication that the Calibrator is in operate mode. *OPT? This command shows a list of the installed hardware and software options. This command is reserved for future use.
Remote Commands Remote Command List 6 OUT This command sets the output mode and value of the Calibrator. To source a temperature, select the necessary mode and sensor parameters first with the TSENS_TYPE, RTD_TYPE, and TC_TYPE commands. Use the multiplier prefixes k for kilo, m for milli, and u for micro with the OUT command units, as necessary. The unit can be ignored if the output mode is not to be changed.
7526A Users Manual OUT? This command shows the current output value and units of the Calibrator. Parameter: Response: , where is the current output value and where is one of these: V DC volts A DC current OHM Resistance CEL Temperature in Celsius FAR Temperature in Fahrenheit Examples: Explanation OUT? 1.88300E-02,A Current output is 18.83 mA OUT? 1.23000E+00,V Current output is 1.23 V OUT? 4.00000E+03,OHM Current output is 4.0 KO OUT? 1.
Remote Commands Remote Command List 6 PRES_MEAS This command changes the primary display operation mode to pressure measurement. Parameter: Response: Example: PRES_MEAS This example changes the primary display operation mode to pressure measurement. PRES_UNIT This command sets the primary display pressure units.
7526A Users Manual PRES_UNIT? This command shows the primary display pressure units.
Remote Commands Remote Command List 6 RANGE? This command shows the current DC voltage or current output range. Parameter: Response: where is one of these: Example: V_0.1V DC volts, 100 mV range V_1V DC volts, 1V range V_10V DC volts, 10 V range V_100V DC volts, 100 V range A_0.1A DC current NONE neither volts nor current is selected RANGE? V_10V This example is an indication that the current output range is 10 V.
7526A Users Manual RANGELCK? This command shows the DC voltage range lock status. Parameter: Response: where is one of these: Example: ON DC voltage range lock is on OFF DC voltage range lock is off RANGELCK? OFF This example is an indication that the range lock is off. REMOTE This command puts the Calibrator into the remote condition. It duplicates the IEEE-488 REN (Remote Enable) message.
Remote Commands Remote Command List 6 *RST This command resets the Calibrator to the power-up condition and holds off execution of subsequent commands until the reset operation is complete. A reset action invokes the subsequent commands and values for the primary display: Command Value OUT 0V PRES_UNIT Last selected RANGE 0.
7526A Users Manual RTD_TYPE This command sets the Resistance Temperature Detector (RTD) sensor type for RTD source and measure. Typically, before you use the RTD_TYPE command to select the RTD type, use the TSENS_TYPE command to select RTD mode, and afterwards set the output temperature with the OUT command, if applicable. A change in temperature sensors sets the output to 0 °C. Note that the SPRT can only be used to measure signals, not source them.
Remote Commands Remote Command List 6 RTD_TYPE? This command shows the Resistance Temperature Detector (RTD) sensor type that is in operation for RTD temperature source and measurement. Parameter: Response: where is one of these: Example: PT385_100 100-ohm RTD, curve a=0.00385 ohms/ohm/°C PT385_200 200-ohm RTD, curve a=0.00385 ohms/ohm/°C PT385_500 500-ohm RTD, curve a=0.00385 ohms/ohm/°C PT385_1000 1000-ohm RTD, curve a=0.
7526A Users Manual *SRE Service Request Enable command. This command puts a byte into the Service Request Enable (SRE) register. See the Service Request Enable Register (SRE) description in the “Check Product Status” section of Chapter 5. Since bit 6 is not used (decimal value 64), the maximum entry is 255 - 64 =191. Parameter: where is the decimal equivalent of the SRE byte, 0 to 191 Response: Example: *SRE 48 This example enables bits 4 (MAV) and 5 (ESB).
Remote Commands Remote Command List 6 STBY This command puts the Calibrator in standby mode. This stops the output at front panel terminals. This command does the same as if you push the front panel key when in operate mode. Parameter: Response: Example: STBY This example disconnects the selected output from the Calibrator front panel terminals. It also shows Stby on the display. ST_START This command puts the Calibrator in switch test mode and starts a new switch test.
7526A Users Manual ST_OPEN? In switch test recall mode, this command shows the value at which the switch opened. Parameter: Response: , where is the value recorded from the primary display at the time the switch opened and where are the units recorded from the primary display at the time the test was done. Example: ST_OPEN? 5.53000E+01,CEL This example shows the value at which a temperature switch opened in Celsius.
Remote Commands Remote Command List 6 TC_MEAS This command places the primary display in thermocouple measure mode. Parameter: where is one of these: CEL display in degrees Celsius FAR display in degrees Fahrenheit display in the last selected temperature unit Response: Example: TC_MEAS FAR This example puts the Calibrator into thermocouple measure mode, and shows in degrees Fahrenheit.
7526A Users Manual TC_TYPE This command sets the Thermocouple (TC) sensor type that is used for TC temperature source and measurement. Typically, before you use the TC_TYPE command to select the TC type, use the TSENS_TYPE command to select TC mode, and afterwards set the output temperature with the OUT command, if applicable. A change in temperature sensors sets the output to 0 °C.
Remote Commands Remote Command List 6 TC_TYPE? This command shows the Thermocouple (TC) sensor type that is used for TC temperature source and measurement.
7526A Users Manual TSENS_TYPE? This command shows the current temperature mode, thermocouple (TC) or Resistance Temperature Detector (RTD). Parameter: Response: where is one of these: Example: TC Thermocouple RTD Resistance Temperature Detector TSENS_TYPE? TC This example is an indication that the current temperature mode is thermocouple. *TST? This command does a series of self-tests and shows a "0" for pass or a "1" for fail.
Remote Commands Remote Command List 6 VAL? This command shows the last values for the isolated and primary measurements, in that sequence. Parameter: Response: ,,, where is the current isolated measurement expressed in scientific notation.
7526A Users Manual *WAI This command prevents further remote commands from being executed until all prior remote commands are complete. For example, if you send an OUT command, you can cause the Calibrator to wait until the output has settled before continuing on to the next command if you follow OUT with a *WAI command. The *WAI command is useful with all overlapped commands. This prevents the Calibrator from processing other commands until the overlapped command is complete.
Remote Commands Remote Command List 6 ZERO_MEAS? This command shows the zero offset for pressure modules, thermocouple millivolts, or RTD ohms. Parameter: Response: , where < zero offset > is the current offset. and where is one of these: Example: OHM Ohms V DC volts (thermocouple millivolts) or one of the pressure units listed with the PRES_UNIT? command ZERO_MEAS? 1.
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Chapter 7 Maintenance Title Introduction .......................................................................................................... Clean the Calibrator ............................................................................................. Replace a Line Fuse ............................................................................................. Change the Line Voltage .....................................................................................
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Maintenance Introduction 7 Introduction This chapter tells you how to do the usual maintenance and tasks necessary to keep the Product in service. XWWarnings To prevent possible electrical shock, fire, or personal injury: • Have an approved technician repair the Product. • Disconnect the mains power cord before you remove the Product covers. • Do not operate the Product with covers removed or the case open. Hazardous voltage exposure is possible. • Use only specified replacement parts.
7526A Users Manual and 120 V ±10 % about setting, or that the selector is set to 240 V for line voltages between 220 V and 240 V ±10 % about setting.
