® 8845A/8846A Digital Multimeter Users Manual July 2006, Rev. 2, 6/08 © 2006, 2007, 2008 Fluke Corporation. Specifications subject to change without notice. All rights reserved. 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 Page Introduction and Specifications......................................................... 1-1 Introduction........................................................................................................ Manual Set ......................................................................................................... About this Manual ............................................................................................. Safety Information ...........
8845A/8846A Users Manual Continuity ...................................................................................................... 1-21 Diode Test ..................................................................................................... 1-22 Measurement Rates (IEEE488[4])................................................................. 1-22 2 Preparing the Meter for Operation ..................................................... 2-1 Introduction.........................................
Contents (continued) Controlling System-Related Operations ............................................................ Identifying Meter Errors................................................................................ Querying the Firmware for Revision Level................................................... Adjusting Display Brightness........................................................................ Setting the Meter’s Date and Time............................................................
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List of Tables Table 1-1. 1-2. 1-3. 1-4. 1-5. 2-1. 2-2. 3-1. 3-2. 3-3. Title Safety Information ................................................................................................. Safety and Electrical Symbols................................................................................ Volatile Memory Space.......................................................................................... Non-volatile Memory Space ....................................................................
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List of Figures Figure 2-1. 2-2. 2-3. 2-4. 3-1. 3-2. 4-1. 4-2. 4-3. 4-4. 4-5. 4-6. 4-7. 4-8. 4-9. Title Replacing the Line Fuse......................................................................................... Replacing the Current Input Fuses ......................................................................... Line Power Cords Types Available from Fluke..................................................... Bail Adjustment and Removal ............................................................
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Chapter 1 Introduction and Specifications Title Page Introduction........................................................................................................ Manual Set ......................................................................................................... About this Manual ............................................................................................. Safety Information ..........................................................................................
8845A/8846A Users Manual Diode Test ..................................................................................................... 1-22 Measurement Rates (IEEE488[4]).................................................................
Introduction and Specifications Introduction 1 Introduction The 8845A and 8846A are 6-1/2 digit, dual-display multimeters designed for bench-top, field service, and system applications. Their full complement of measurement functions plus its RS-232, IEEE 488, and Ethernet Remote Interfaces makes these multimeters ideal candidates for precision manual measurements and use in automated systems. For portability, these multimeters include a carrying handle that also serves as a bail for bench top operation.
8845A/8846A Users Manual About this Manual This is the Users Manual for the 8845A and 8846A Digital Multimeters (hereafter referred to as the Meter). It contains all of the information a new user will need to operate the Meter effectively. The manual is divided into the following chapters: Chapter 1 “Introduction and Specifications” provides information on how to safely use the Meter, standard and optional accessories, and specifications.
Introduction and Specifications Safety Information 1 Table 1-1. Safety Information XW Warning To avoid possible electric shock, personal injury, or death, read the following before using the Meter: • Use the Meter only as specified in this manual, or the protection provided by the Meter might be impaired. • Do not use the Meter in wet environments. • Inspect the Meter before using it. Do not use the Meter if it appears damaged. • Inspect the test leads before use.
8845A/8846A Users Manual Symbols Table 1-2 is a list of safety and electrical symbols that appear on the Meter or in this manual. Table 1-2. Safety and Electrical Symbols Symbol Description Symbol Description W Risk of danger. Important information. See manual X Hazardous voltage.
Introduction and Specifications Accessories 1 Non Volatile Memory Table 1-4 lists the Meter’s non-volatile memory elements. Table 1-4. Non-volatile Memory Space Type Size Function Flash 128 MB Application program storage, user string, user data, user remote interface settings, calibration constants. Flash 4 MB FPGA hardware setup, application program storage, calibration constants. To clear the 128 MB of non-volatile flash memory listed in Table 1-4: 1. Press M. 2.
8845A/8846A Users Manual Table 1-5. Accessories (cont) Model/Fluke PN 1-8 Description 884X-Case Black plastic case TL910 Precision Electronic Probe Set TL910 Precision Electronic Probe Set TL80A Basic Electronic DMM Test Set TL2X4W-PTII 2X4 Wire Ohms Test Lead TL2X4W-TWZ 2X4 Wire Ohms SMD Test Tweezer 8845A-EFPT Test Probe Tip Adapter, Extended Fine Point 8845A-TPIT Test Probe Tip Adapter, IC Probe Tip 803293 Fuse, 11 A, 1000 V, Fast, .406INX1.
Introduction and Specifications General Specifications 1 Table 1-5. Accessories (cont) Model/Fluke PN Description 1259340 Agreement, Calibration, Accredited 2441827 Agreement, Calibration, primary standards lab 1540600 Agreement, Calibration, artifact General Specifications Power Voltage 100 V Setting ...................................................... 90 V to 110 V 120 V Setting ...................................................... 108 V to 132 V 220 V Setting ................................
8845A/8846A Users Manual Trigger Delay ...................................................... 0 s to 3600 s; in 10 μS increments External Trigger Delay ........................................ <1 mS External Trigger Jitter ......................................... <500 μS Trigger Input ....................................................... TTL Levels Trigger Output..................................................... 5 V maximum (open collector) Memory 8845A...............................................
Introduction and Specifications Electrical Specifications 1 Input Characteristics Resolution 5½ Digits Range Resolution 100 mV 100.0000 mV 10 μV 1 μV 100 nV 10 MΩ or >10 GΩ [1] 1V 1.000000 V 10 μV 1 μV 10 MΩ or >10 GΩ [1] 10 V 10.00000 V 100 μV 1 mV 10 MΩ or >10 GΩ [1] 100.0000 V 10 mV 100 μV 1 mV 10 μV 100 V 1,000.000 V 100 mV 10 mV 100 μV 1 mV 10 MΩ ±1% 1000 V 4½ Digits 6½ Digits Input Impedance 10 MΩ ±1% [1] Inputs beyond ±14 V are clamped through 200 kΩ typical.
8845A/8846A Users Manual Additional Crest Factor Errors (<100 Hz)............ Crest factor 1-2, 0.05 % of full scale Crest factor 2-3, 0.2 % of full scale Crest factor 3-4, 0.4 % of full scale Crest factor 4-5, 0.5 % of full scale Input Characteristics Resolution 5½ Digits Range Resolution 100 mV 100.0000 mV 10 μV 1 μV 1V 1.000000 V 1 μV 10.00000 V 100 μV 1 mV 10 μV 10 V 10 μV 4½ Digits 100 V 100.0000 V 10 mV 100 μV 1 mV 1000 V 1,000.
Introduction and Specifications Electrical Specifications 1 8845A Accuracy Accuracy is given as ± (% measurement + % of range) 100 mV 1V 10 V 100 V 90 Days (23 ±5 °C) 3 – 5 Hz 5 – 10 Hz 1.0 + 0.03 0.35 + 0.03 1.0 + 0.04 0.35 + 0.04 1.0 + 0.04 0.35 + 0.04 0.10 + 0.004 0.035 + 0.004 10 Hz – 20 kHz 20 – 50 kHz 50 – 100 kHz [1] 100 – 300 kHz 3 – 5 Hz 5 – 10 Hz 10 Hz – 20 kHz 0.04 + 0.03 0.1 + 0.05 0.55 + 0.08 4.0 + 0.50 1.0 + 0.02 0.35 + 0.02 0.04 + 0.02 0.05 + 0.04 0.11 + 0.05 0.6 + 0.08 4.
8845A/8846A Users Manual Resistance Specifications are for 4-wire resistance function, 2 x 4-wire resistance, or 2-wire resistance with zero. If zero is not used, add 0.2 Ω for 2-wire resistance plus lead resistance, and add 20 mΩ for 2 x 4-wire resistance function. Measurement Method ............................................. Current source referenced to LO input Max. Lead Resistance (4-wire ohms) ..................... 10 % of range per lead for 10 Ω, 100 Ω, 1 kΩ ranges.
Introduction and Specifications Electrical Specifications 1 8845A Accuracy Accuracy is given as ± (% measurement + % of range) 1 Year (23 ±5 °C) Temperature Coefficient/ °C Outside 18 to 28 °C 24 Hour (23 ±1 °C) 90 Days (23 ±5 °C) 100 Ω 0.003 + 0.003 0.008 + 0.004 0.01 + 0.004 0.0006 + 0.0005 1 kΩ 0.002 + 0.0005 0.008 + 0.001 0.01 + 0.001 0.0006 + 0.0001 10 kΩ 0.002 + 0.0005 0.008 + 0.001 0.01 + 0.001 0.0006 + 0.0001 100 kΩ 0.002 + 0.0005 0.008 + 0.001 0.01 + 0.001 0.0006 + 0.
8845A/8846A Users Manual Accuracy (8846A) Accuracy is given as ± (% measurement + % of range) 1 Year (23 ±5 °C) Temperature Coefficient/ °C Outside 18 to 28 °C 24 Hour (23 ±1 °C) 90 Days (23 ±5 °C) 100 μA 1 mA 0.01 + 0.02 0.007 + 0.005 0.04 + 0.025 0.030 + 0.005 0.05 + 0.025 0.05 + 0.005 0.002 + 0.003 0.002 + 0.0005 10 mA 100 mA [3] 400 mA 0.007 + 0.02 0.01 + 0.004 0.03 + 0.004 0.03 + 0.02 0.03 + 0.005 0.04 + 0.005 0.05 + 0.02 0.05 + 0.005 0.05 + 0.005 0.002 + 0.002 0.002 + 0.0005 0.005 + 0.
Introduction and Specifications Electrical Specifications 1 Fast ..................................................................... 200 Hz to 10 kHz Crest Factor Error (applies to non-sinusoidal waveforms only) Maximum Crest Factor ....................................... 5:1 at full scale Additional Crest Factor Errors (<100 Hz)............ Crest factor 1-2, 0.05 % of full scale Crest factor 2-3, 0.2 % of full scale Crest factor 3-4, 0.4 % of full scale Crest factor 4-5, 0.
8845A/8846A Users Manual 8846A Accuracy Accuracy is given as ± (% measurement + % of range) Frequency (Hz) Range 100 μA 1 mA 10 mA 100 mA 400 mA 1A 3A [2] [1][2] 10 A [2] [3] 24 Hour (23 ±1 °C) 90 Days (23 ±5 °C) 1 Year (23 ±5 °C) Temperature Coefficient/ °C Outside 18 to 28 °C 3 – 5 Hz 1.1 + 0.06 1.1 + 0.06 1.1 + 0.06 5 – 10 Hz 0.35 + 0.06 0.35 + 0.06 0.35 + 0.06 0.2 + 0.006 0.1 + 0.006 10 Hz – 5 kHz 0.15 + 0.06 0.15 + 0.06 0.15 + 0.06 0.015 + 0.006 5 – 10 kHz 3 – 5 Hz 0.
Introduction and Specifications Electrical Specifications 1 8845A Accuracy Accuracy is given as ± (% measurement + % of range) Frequency (Hz) Range 10 mA 100 mA 400 mA 1A 3A [2] [1][2] 10 A [2] [3] 24 Hour (23 ±1 °C) 90 Days (23 ±5 °C) 1 Year (23 ±5 °C) Temperature Coefficient/ °C Outside 18 to 28 °C 3 – 5 Hz 1.1 + 0.06 1.1 + 0.06 1.1 + 0.06 5 – 10 Hz 0.35 + 0.06 0.35 + 0.06 0.35 + 0.06 0.2 + 0.006 0.1 + 0.006 10 Hz – 5 kHz 0.15 + 0.06 0.15 + 0.06 0.15+ 0.06 0.015 + 0.
8845A/8846A Users Manual 8846A Accuracy Accuracy is given as ± % measurement Range 100 mV to [1][2] 1000 V 24 Hour 90 Days 1 Year (23 ±1 °C) (23 ±5 °C) (23 ±5 °C) Frequency 3 – 5 Hz 0.1 0.1 0.1 Temperature Coefficient/ °C Outside 18 to 28 °C 0.005 5 – 10 Hz 0.05 0.05 0.05 0.005 10 – 40 Hz 0.03 0.03 0.03 0.001 40 Hz – 300 kHz 0.006 0.01 0.01 0.001 300 kHz – 1 MHz 0.006 0.01 0.01 0.001 [1] Input >100 mV. For 10 – 100 mV, multiply percent measurement error by 10.
Introduction and Specifications Electrical Specifications 1 Capacitance (8846A Only) Accuracy is stated as ±(% of measurement + % of range) Range 1 Year Accuracy (23 ±5 °C) Resolution [1] Temperature Coefficient/ °C Outside 18 to 28 °C 1 pF 2% ± 2.5 % 0.05 + 0.05 10 nF 10 pF 1% ± 0.5 % 0.05 + 0.01 100 nF 100 pF 1% ± 0.5 % 0.01 + 0.01 1 μF 1 nF 1% ± 0.5 % 0.01 + 0.01 10 μF 10 nF 1% ± 0.5 % 0.01 + 0.01 100 μF 1 mF 100 nF 1% ± 0.5 % 0.01 + 0.01 1 μF 1% ± 0.5 % 0.01 + 0.
8845A/8846A Users Manual Diode Test Test Current ............................................................ 100 μA or 1 mA Response Time....................................................... 300 samples/sec with audible tone. Accuracy is given as ± (% measurements + % of range) 24 Hour (23 ±1 °C) 90 Days (23 ±5 °C) 0.002 + 0.002 0.002 + 0.001 0.008 + 0.002 0.008 + 0.002 Range 5.0000 V 10.0000 V 1 Year (23 ±5 °C) 0.01 + 0.002 0.01 + 0.002 Temperature Coefficient/ °C Outside 18 to 28 °C 0.001 + 0.
Chapter 2 Preparing the Meter for Operation Title Page Introduction........................................................................................................ Unpacking and Inspecting the Meter ................................................................. Contacting Fluke................................................................................................ Storing and Shipping the Meter .........................................................................
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Preparing the Meter for Operation Introduction 2 Introduction This chapter explains how to prepare the Meter for operation by selecting the proper line voltage, connecting an appropriate line power cord, and turning on the Meter. Also included is information on the proper storage and cleaning of the Meter. Unpacking and Inspecting the Meter Every care is taken in the choice of packing material to ensure that your equipment will reach you in perfect condition.
8845A/8846A Users Manual does not match the power the Meter will be plugged into, then the Meter’s line voltage setting must be changed and the line fuse possibly replaced. Selecting the Line Voltage The Meter will operate on any one of four different input line voltages. The set line voltage is visible through the window in the line fuse holder, found on the Meter's rear panel. To change the line voltage: 1. Remove the power cord from the Meter. 2.
Preparing the Meter for Operation Power Considerations 2 Table 2-1. Line Voltage to Fuse Rating Line Voltage Selection Fuse Rating Fluke Part No. 100 0.25 A, 250 V (slow blow) 166306 120 0.25 A, 250 V (slow blow) 166306 220 0.125 A, 250 V (slow blow) 166488 240 0.125 A, 250 V (slow blow) 166488 120 caw0201f.eps Figure 2-1. Replacing the Line Fuse Current-Input Fuses The 400 mA and 10 A inputs are protected by user-replaceable fuses.
8845A/8846A Users Manual If the fuse is good, the Meter will read less than 1 Ω. If the fuse is blown, the Meter will read overload. To replace the Current Input fuses, 1. Turn the Meter off, unplug the power cord from the Meter, and remove all test leads. 2. Turn the Meter on its back. 3. Unscrew the retaining screw on the fuse access door as depicted in Figure 2-2. 4.
Preparing the Meter for Operation Connecting to Line Power 2 Connecting to Line Power XW Warning To avoid shock hazard, connect the factory supplied threeconductor line power cord to a properly grounded power outlet. Do not use a two-conductor adapter or extension cord; this will break the protective ground connection.
8845A/8846A Users Manual Turning Power-On XW Warning To avoid electric shock, connect the Meter’s power cord to a power receptacle with proper earth ground. A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation. With the proper line voltage selected and the appropriate power cord connected to the Meter, connect the power cord to a power outlet and switch rear-panel power switch so the “I” side of the switch is depressed.
Preparing the Meter for Operation Cleaning the Meter 2 Cleaning the Meter XW Warning To avoid electric shock or damage to the Meter, never get water inside the meter. W Caution To avoid damaging the Meter’s housing, do not apply solvents to the Meter. If the Meter requires cleaning, wipe it down with a cloth lightly dampened with water or a mild detergent. Do not use aromatic hydrocarbons, chlorinated solvents, or methanolbased fluids when wiping down the meter.
8845A/8846A Users Manual 2-10
Chapter 3 Front-Panel Operation Title Page Introduction........................................................................................................ Controls and Indicators ...................................................................................... Front-Panel Feature Descriptions .................................................................. Display Panel................................................................................................. Rear-Panel Connectors ....
8845A/8846A Users Manual Identifying Meter Errors................................................................................ Querying the Firmware for Revision Level................................................... Adjusting Display Brightness........................................................................ Setting the Meter’s Date and Time................................................................ USB Operation ............................................................................
Front-Panel Operation Introduction 3 Introduction The Meter can be controlled either by sending commands through one of its communication interfaces or by manually operating its front panel controls. This chapter explains the function and use of the controls and indicators located on the front and rear panels of the Meter. Operating the Meter through its computer interfaces is covered in the Programmers Manual. The following features are not available in OutGuard SW versions earlier than 2.
8845A/8846A Users Manual Controls and Indicators Front-Panel Feature Descriptions Table 3-1 shows the Meter’s front-panel controls and connectors. Table 3-1.
Front-Panel Operation Controls and Indicators 3 Table 3-1. Front-Panel Controls and Connectors (cont.) Item Description D Memory key for accessing internal and external memory [1] containing meter setups and measurements. See the “Accessing and Controlling Memory” section for more information. E USB Port. [1] Connection for optional memory device to store meter readings. F Standby key to turn off the display. While in standby, the Meter will not respond to remote or front-panel commands.
8845A/8846A Users Manual Table 3-2. Display Elements mV 1 V 12 2 11 100.0002 10 -0.4561 9 8 ... 123.123. -- Hz 3 4 mV~ 123.123. 5 6 ENTER 7 caw02f.eps Item Description A Primary display. B Secondary display. C Indicates PASS, HIGH or LOW for limits testing. D Math function selected. E Error detected. F Memory enabled for storing readings. Extinguishes when last sample is stored. G Softkey labels. H Manual range mode selected. See “Adjusting the Meter’s Range” section.
Front-Panel Operation Controls and Indicators 3 Rear-Panel Connectors Table 3-3 indicates the connections on the rear panel and describes their use. Table 3-3. Rear-Panel Connectors 1 2 3 4 1/4 A SLOW FUSE,100/120 VAC 1/8 A SLOW FUSE, 220/240 VAC INPUT 47 - 440 Hz 25 VA MAX SENSE 4W V CAUTION: FOR FIRE PROTECTION REPLACE ONLY WITH A 250V FUSE AS STATED IN MANUAL.
8845A/8846A Users Manual Adjusting the Meter’s Range The range keys, (URV), switch the Meter between auto and manual ranging. The presence or absence of MAN in the display indicates the Meter’s ranging mode. All functions utilize these keys to control the Meter’s range except continuity, diode test, temperature (8846A only), frequency and period, which only have a single range. Note The secondary display’s range is always the same as that of the primary display when the functions are the same.
Front-Panel Operation Configuring the Meter for a Measurement 3 The beeper state is stored in non-volatile memory and does not change when the Meter is turned off or after a remote interface reset. The beeper is enabled when the Meter is shipped from the factory. Setting the Display Resolution The steps for setting the Meter’s displayed resolution, varies depending on the selected function. The dc volts, dc current and ohms functions set the resolution based on the power line cycle (PLC) setting.
8845A/8846A Users Manual Note The 20 Hz filter is the power-up default selection. Setting Continuity Resistance Threshold and Diode Test Parameters The threshold resistance value for the continuity function and the amount of current and voltage used for Diode testing are adjustable. Continuity resistance threshold can be set to four different values: 1 Ω, 10 Ω, 100 Ω and 1 kΩ. Diode test voltage and current can also be set to two different values: 5 V or 10 V and 1 mA or 0.1 mA.
Front-Panel Operation Using the Analyze Functions 3 2. Press the MORE soft key. 3. Press the HIGH INPUT Z soft key. The soft key label becomes highlighted to indicate high input Z is activated. Press the soft key again to disable the function. Using the Analyze Functions The Meter is capable of performing mathematical operations with measured values, as well as tracking a series of measurements. With the exception of Diode Test and Continuity, all Meter functions work with all analysis functions.
8845A/8846A Users Manual Stopping Measurement Collection There are two methods of stopping the collection of measurements for the statistics function. To manually stop the measurement collection, press the STOP soft key from the statistics menu. The display will update with the final set of statistical data. The process can also be stopped automatically by entering the number of samples on which you want to calculate statistics. To enter the number of statistic samples: 1.
Front-Panel Operation Using the Analyze Functions 3 With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the character. The right most character is the multiplier. This character can be set to p, n, μ, m, k, M, or G. 5. Press ENTER to set the selected limit. 6. Press ENABLE to start the limits testing. Note Since the high and low limits are independent of each other, both high and low limit conditions could be satisfied by a measurement.
8845A/8846A Users Manual To make an mX+B calculation: 1. Press J. 2. Press the MATH soft key. 3. Press the €X+B soft key. To enter the M value: 4. Press the €X soft key To select the digit to adjust, press either <-- or -->. With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the character. 5. Press ENTER to enter the M value. 6. Press Bto return to the MX+B menu. To enter the B value: 7. Press the B soft key.
Front-Panel Operation Using the Analyze Functions 3 plot point. Previously laid down plot marks are adjusted down in size proportionally to the new vertical axis. The left section of the Meter’s display indicates the highest (maximum) and lowest (minimum) reading taken since the start of a TrendPlot session. In addition, the length of the TrendPlot session is displayed in hours, minutes, and seconds (hh:mm:ss). To start a TrendPlot session: 1.
8845A/8846A Users Manual F1 F2 F3 F4 F5 caw056.eps Figure 3-2. Histogram Display In addition to the bar graph, the left third of the display also displays the number of samples, the average, and standard deviation values. To start a histogram session: 1. Set up the Meter for the desired measurement by selecting the function, and connecting the signal to the Meter’s input. 2. With the Meter taking measurements, press J. 3. Press HISTOGRAM to start the session.
Front-Panel Operation Controlling Trigger Functions 3 Note Setting the Meter to trigger via a remote command is only accessible through the remote interface. See the “Triggering” section in the Programmers Manual for more information on remote triggering. Auto Triggering In auto trigger mode, the Meter’s measurements are triggered by internal circuitry. These triggers are continuous and occur as fast as the configuration will allow. Auto triggering is the Meter’s power-on trigger source.
8845A/8846A Users Manual 4. To select a specific digit to adjust, press either <-- or -->. With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the digit. 5. With the desired delay set, press the soft key labeled ENTER. Setting the Number of Samples Normally, the Meter takes one measurement (or sample) each time a trigger is received if in “wait-for-trigger” state. However, you can set the Meter to take a specified number of measurements for each trigger.
Front-Panel Operation Controlling Trigger Functions + 3 0.5993 F1 F2 F3 F4 F5 caw032.eps 2. Press the STORE READINGS soft key shown above. 3. If not already highlighted, press the INTERNAL MEMORY soft key. 4. Press the #SAMPLES soft key. 5. To adjust the number of samples, press either <-- or --> to select a digit. With the desired digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the character.
8845A/8846A Users Manual Note Each memory file will store up to 10000 readings. If the number of samples is set to a value greater than 10000, consecutive memory files will be used to store all the samples. If the readings fill the last file (999), reading storage will stop. Recalling Readings from Memory To recall readings from internal memory: 1. Press M. 2. Press the RECALL READING soft key. The Meter displays the first stored reading from the internal file.
Front-Panel Operation Controlling Trigger Functions 3 4. To store the present Meter configuration in one of the first four memory locations, press the appropriate soft key. If you want to store the present Meter configuration in a location other than the first four locations, press the MORE soft key. The display indicates the next available memory location. If all configuration memory locations are filled, the Meter will always indicate memory location 10. 5.
8845A/8846A Users Manual Removing the Power-up Configuration To remove the Meter’s stored power-up configuration: 4. Press M. 5. Press the STORE CONFIG softkey. 6. Press the REMOVE POWER-UP softkey. After removing the power-up configuration, power the Meter down and back up using the rear-panel power switch to restore factory default settings. Recalling a Meter Configuration To recall a configuration from internal memory: 1. Press M. 2. Press the RECALL CONFIG soft key. 3.
Front-Panel Operation Controlling System-Related Operations 3 To copy the last or interrupted readings file from internal memory to an already-inserted USB memory device: 1. Press M. 2. Press the INIT MEAS TO USB soft key. The copy process will take several seconds. To erase USB memory, refer to the “Media Memory” section in Chapter 1. To clear internal memory contents: 3. Press M. 4. Press the MANAGE MEMORY soft key as shown below. 9.30011 V~ F1 F2 F3 F4 F5 caw062.eps 5.
8845A/8846A Users Manual Querying the Firmware for Revision Level The Meter makes available the hardware version, software version, and serial number of the instrument. To view the versions and serial number: 1. Press I. 2. Press the soft key under SYSTEM. 3. Press the soft key under VERSIONS + SN under the Setup menu. The display shows the outguard software version (OutG SW), the inguard software version (InG SW), the outguard hardware version (OutG HW) and the inguard hardware version (InG HW).
Front-Panel Operation Configuring the Remote Interface 3 If STOP is selected during storage to the USB device, readings in internal memory will be written directly to the device. Note that this may take several seconds. A USB memory device should never be removed while a write is occurring. The data is initially stored in internal memory and then transferred to the USB memory device. For large data samples (i.e.
8845A/8846A Users Manual + F1 0.5993 F2 F3 F4 F5 caw034.eps 3. Press the CAL DATE soft key to display the date the Meter was last calibrated. 4. Press B to go back to the previous menu. Note UNLOCK CAL allows entry of a password so authorized personnel can calibrate the Meter or change the (CAL) USER STRING. Note CAL USER STRING can be changed/entered after UNLOCK CAL. The string also appears on the top line/row of the stored readings files.
Chapter 4 Making Measurements Title Page Introduction........................................................................................................ Selecting Function Modifiers............................................................................. Activating the Secondary Display ..................................................................... Measuring Voltage............................................................................................. Measuring DC Voltage..........
8845A/8846A Users Manual 4-2
Making Measurements Introduction 4 Introduction XW Warning To avoid possible electrical shock, and/or damage to the Meter, • Read the safety information found in Chapter 1 before operating this meter. • Do not apply more than 1000 volts between any terminal and earth ground. This chapter covers the steps for making a measurement with each of the Meter’s functions.
8845A/8846A Users Manual Measuring Voltage The Meter is capable of measuring up to 1000 V dc, 750 V ac (8845A) or 1000 V ac (8846A). W Caution To avoid blowing the current fuses and possible damage to other equipment, do not apply voltage to the meter’s input until the test leads are properly connected to the input, and the proper voltage function selected. Measuring DC Voltage To make a dc voltage measurement: 1. Press E.
Making Measurements Measuring Voltage 4 is only available for dc functions at rates slower than 1 PLC. The number of readings averaged by the digital filter varies with dc function and range. A FLTR A 3-pole analog filter for improving noise immunity. The filter is active when this soft key label is highlighted and will increase stabilization time of the measurement. See Appendix D for more information on when to use the analog filter.
8845A/8846A Users Manual Function modifiers: Filter Displays the filter menu. For best accuracy and stable readings, choose a filter based on the lowest frequency to be measured and the performance needed. 3HZ SLOW Provides higher measurement accuracy on ac signals between 3 Hz and 20 Hz. However, the measurement cycle time is longer than it is when using the 20 Hz filter. 20HZ Provides higher measurement accuracy on ac signals between 20 Hz and 200 Hz.
Making Measurements Measuring Frequency and Period 4 Measuring Frequency and Period The Meter measures the frequency, or period of ac signals between 3 Hz and 1 MHz, applied between the Meter’s HI and LO connectors. The G key not only activates the Meter’s Frequency/Period function, but also toggles the Meter’s primary display between the signal’s frequency and period measurement.
8845A/8846A Users Manual will source current through the INPUT HI and LO terminals and use the SENSE HI and LO to measure the resistance. Making a Two-wire Resistance Measurement To make a two-wire resistance measurement: 1. Connect the test leads to the Meter’s input connectors as shown in Figure 4-1. 2. Press N. 0.206220MΩ F1 F2 F3 F4 F5 caw030.eps 3. If not already highlighted as shown above, press the 2W 2WX4W soft key. Function modifiers: D FLTR A filter for quieting noisy measurments.
Making Measurements Measuring Resistance 4 0.217384 F1 F2 F3 F4 F5 caw031.eps 3. If not already highlighted as shown above, press the 4WIRE soft key to switch to a four-wire measurement. INPUT SENSE 4W V 2W/4W 2 HI HI 1000 V CAT I 600V CAT II 300V LO LO 1V FUSED 400 mA 10A REAR FRONT caw023.eps Figure 4-2. Input Connections for 4-wire Resistance Measurements To make a four-wire resistance measurement using Fluke’s 2X4 test leads: 1.
8845A/8846A Users Manual INPUT SENSE 4W V 2W/4W 2 HI HI 1000 V CAT I 600V CAT II 300V LO LO 1V FUSED 400 mA Ground tab 10A REAR FRONT caw060.eps Figure 4-3. Input Connections for 4-wire Ohms Using 2x4 Wire Leads Function modifiers: D FLTR A filter for quieting noisy measurments. This filter averages readings to reduce reading noise when in immedicate trigger mode or when in trigger mode with an unending number of triggers selected.
Making Measurements Measuring Current 4 Current measurements expecting to be between 400 mA and 10 A are made using the Input LO and 10A input connectors as shown in Figure 4-5. I < 400 mA INPUT SENSE 4W V 2W/4W 2 HI HI 1000 V CAT I 600V CAT II 300V LO LO 1V FUSED V AC 400 mA 10A FRONT REAR caw025.eps Figure 4-4.
8845A/8846A Users Manual 0.0086 F1 F2 F3 F4 F5 caw09f.eps 3. With the test leads connected to the 400 mA and Input LO connectors, press the€A soft key as shown above, if not already highlighted. If the test leads are connected to the 10A and Input LO connectors, then press the 10A soft key. 4. Apply power to the measured circuit and read the current in the Meter’s display. Function modifiers: D FLTR A filter for quieting noisy measurments.
Making Measurements Measuring Capacitance (8846A only) 4 2. Press K. 0.0333uA~ F1 F2 F3 F4 F5 caw08f.eps 3. With the test leads connected to the 400 mA and Input LO connectors, press the €A soft key as shown above, if not already highlighted. If the test leads are connected to the 10A and Input LO connectors, then press the 10A soft key. 4. Apply power to the measured circuit and read the current in the Meter’s display. Function modifiers: Filter Displays the filter menu.
8845A/8846A Users Manual 2. With the leads open, press Z. 3. Connect the Meter’s test leads as shown in Figure 4-6. INPUT SENSE 4W V 2W/4W 2 HI HI 1000 V CAT I 600V CAT II 300V LO LO 1V FUSED 400 mA 10A FRONT REAR caw027.eps Figure 4-6. Measuring Capacitance Refer to the “Range Keys” section in Chapter 3 of this manual for information on how to adjust the measurement range.
Making Measurements Testing Continuity 4 - 246.645 ºF F1 F2 F3 F4 F5 caw11f.eps To change the temperature scale, refer to the “Setting the Default Temperature Scale” section in Chapter 3 of this manual. Available scales are Celsius, Fahrenheit, and Kelvin. Refer to the “Adjusting the Meter’s Range” section in Chapter 3 of this manual for information on how to adjust the measurement range. Function modifiers: 4Wire Switches the measurement input connectors to 4-wire measurement for 4-wire RTDs.
8845A/8846A Users Manual None Checking Diodes The diode function sends a current through a semiconductor junction while the Meter measures the voltage drop across the junction (or junctions). Measurements are displayed in the 10 V range at a relatively fast measurement rate. "OPEN" is displayed for voltages 10 % above the compliance voltage setting. Typical junction voltage drop on good junctions are 0.3 to 0.8 volts. If enabled, the beeper will make a short beep when a good junction is detected.
Making Measurements Making a Triggered Measurement 4 Four soft keys allow changing the test voltage and current applied to the diode through the test leads. The compliance voltage is set to either 5 volts or 10 volts. The compliance current is set to either 1 mA or 0.1 mA. Press the appropriate soft key to select the desired voltage and current setting.
8845A/8846A Users Manual 1. Press Lto display the measurement setup menu. 2. Press the TRIGGER soft key. 3. Press the soft key labeled #SAMPLES. 4. Use the soft keys to set the number of samples between 1 and 50,000. Select the digit in the value by pressing either <-- or -->. With the digit selected, press the soft key labeled -- to decrement the digit or ++ to increment the character. 5. Press ENTER.
Appendices Appendix A B C D Title 2X4 Test Leads ................................................................................................... Errors................................................................................................................... RS-232 Port Connections .................................................................................... Analog Filter Applications ..................................................................................
45A/8846A Users Manual
Appendix A 2X4 Test Leads Introduction The optional Fluke TL2X4W test leads simplify making 4-wire ohms measurements by integrating the HI+HI Sense and LO+LO Sense test leads into one cable. The Meter’s Input HI and LO jacks consist of two contacts. One contact is connected to HI or LO input circuits and the other contact is connected to the Sense input circuits. Like the input jacks, the 2x4 test lead also has two contacts that align with the input jack contacts to provide a four wire connection.
8845A/8846A Users Manual A-2
Appendix B Errors Introduction Listed below are the error messages the Meter uses to indicate a problem. AC Line frequency too high Invalid calibration step number *TRG/GET received but was ignored 488.2 I/O deadlock 488.2 interrupted query 488.2 query after indefinite response 488.
8845A/8846A Users Manual CALibration:DATE not supported for the 8846A Can't get 1V/10V DC linearization constants CCO constant name is bad Character string was more than 12 characters Command not allowed in local Command only allowed in RS-232/Ethernet Could not open guard crossing port Could not open measurement file on USB device Could not open the ethernet port Could not save configuration Could not save MAC address Could not save network configuration Data stale Error occurred reading characters from E
Appendices Errors B Incorrect packet size from inguard Info packet rec'd; link not active Inguard Calibration Constant write failed Inguard not responding (recv) Inguard not responding (send) INITiate received but was ignored Instrument configuration load failed Instrument configuration store failed Insufficient memory Invalid dimensions in a channel list Invalid parameter Invalid parameter Invalid response type from inguard Invalid secure code Invalid string data Invalid suffix in command header Line too
8845A/8846A Users Manual Serial buffer full Someone forgot to call begin (cal) Someone forgot to call begin (ICONF) Someone forgot to call begin (MCONF) Store reading to file failed String size is beyond limit Suffix Error.
Appendix C RS-232 Port Connections Introduction Table C-1 lists the pins and related signals available through the RS-232 port. Table C-1. RS-232 Pin to Signal List Pin Name Usage 1 DCD 2 RX Receive data 3 TX Transmit data 4 DTR Not used 5 GND Signal ground 6 DSR Not used 7 RTS Request to send 8 CTS Clear to send 9 RI Not used Not used The Meter’s RS-232 control lines can be rewired to an alternate pairing instead of the RTS/CTS control pair.
8845A/8846A Users Manual C-2
Appendix D Analog Filter Applications Introduction The Meter’s analog filter is intended to reduce the presence of external ac when making dc measurements. Most applications do not require the use of this filter, but in some situations it can be utilized to improve DC measurements. A good example of this is using the filter when measuring the DC value of a signal with AC content, such as a DC power supply voltage that has significant AC line ripple present.
8845A/8846A Users Manual Table D-2. Ohms Analog Filter Errors Range 10 Ω 100 Ω 100 kΩ NPLC Additional Analog Filter Error 10, 100 0.5 mΩ <10 1.9 mΩ 10, 100 1.5 mΩ <10 9.0 mΩ 10, 100 0.6 Ω <10 2.5 Ω Table D-3. DC Current Analog Filter Errors Range NPLC 100 μA, 10 mA, 1 A 100 0.005 % of range 10 0.015 % of range 1 0.027 % of range 0.2 0.09 % of range 0.02 0.27 % of range 10 0.001 % of range 1 0.0025 % of range 0.2 0.009 % of range 0.02 0.
Index —A— AC Voltage Measurements, 4-5 Analyze functions Histogram, 3-15 Math Limits testing, 3-12 MX+B, 3-13 Offset, 3-13 Statistics, 3-11 TrendPlot, 3-14 —B— Bail adjustment of, 2-8 removal of, 2-8 —C— Calibration date checking of, 3-25 Capacitance measurements, 4-13 Cleaning the Meter, 2-9 Clock setting date and time, 3-24 Configurations recalling, 3-22 storing, 3-20 Configure for Measurements, 3-8 Continuity Setting of threshold, 3-10 Testing for, 4-15 Current measurments AC, 4-12 DC, 4-11 DC Voltag
8845A/8846A Users Manual —H— —O— Historgram, 3-15 Offset, setting of, 3-13 Options and Accessories, 1-7 —I— Input Impedance, Automatic, 3-10 Inspecting Meter, 2-3 —K— Keys Range, 3-8 Soft, 3-4 Soft, labels for, 3-6 —L— Limits Testing setting of limits, 3-12 Using, 3-12 Line Voltage Selection, 2-4 —M— Manual set, 1-3 Math functions Limits testing, 3-12 MX+B, 3-13 Offset, 3-13 Math Operations, 3-11 Measurement Complete Monitoring of, 4-18 Understanding of, 3-18 Measurements AC current, 4-12 AC Voltage
Index (continued) —U— Unpacking Meter, 2-3 User documentation, 1-3 —V— Voltage AC measurements, 4-5 DC measurements, 4-4 3
8845A/8846A Users Manual 4
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