® Model 187 & 189 True RMS Multimeter Users Manual August 2000, Rev.2, 6/02 © 2000, 2002 Fluke Corporation. All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies.
Lifetime Limited Warranty Each Fluke 20, 70, 80, 170 and 180 Series DMM will be free from defects in material and workmanship for its lifetime. As used herein, “lifetime” is defined as seven years after Fluke discontinues manufacturing the product, but the warranty period shall be at least ten years from the date of purchase.
Table of Contents Chapter 1 Title Page Before You Start .......................................................................................................... 1-1 Safety Information.......................................................................................................... 1-1 Contacting Fluke............................................................................................................ 1-1 Symbols ...........................................................................
Model 187 & 189 Users Manual Selecting the Range....................................................................................................... Understanding the Display ............................................................................................. Primary Display ......................................................................................................... Secondary Display.....................................................................................................
Contents (continued) Measuring AC Current .............................................................................................. Measuring DC Current .............................................................................................. Measuring Frequency .................................................................................................... Measuring Duty Cycle....................................................................................................
Model 187 & 189 Users Manual 6 Maintenance ................................................................................................................. 6-1 Introduction .................................................................................................................... General Maintenance..................................................................................................... Testing the Fuses..................................................................................
List of Tables Table 1-1. 1-2. 2-1. 2-2. 2-3. 3-1. 4-1. 5-1. 5-2. 6-1. Title Safety Information................................................................................................................. International Electrical Symbols............................................................................................ Rotary Switch Selections ...................................................................................................... Pushbuttons......................................
List of Figures Figure Title 2-1. 2-2. 2-3. 2-4. 2-5. 2-6. 2-7. 2-8. 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. 3-7. 3-8. 3-9. AC Volts Display ................................................................................................................... Rotary Switch........................................................................................................................ Pushbuttons....................................................................................................................
Model 187 & 189 Users Manual 3-10. 3-11. 3-12. 3-13. 3-14. 3-15. 3-16. 3-17. 3-18. 4-1. 5-1. 6-1. 6-2. Temperature Measurement ................................................................................................... AC Current Measurement...................................................................................................... DC Current Measurement .....................................................................................................
Chapter 1 Before You Start Safety Information Contacting Fluke The Fluke Model 187 and Model 189 True RMS Multimeters (hereafter referred to as the “meter”) comply with: To order accessories, receive assistance, or locate the nearest Fluke distributor or Service Center, call: • • • • • • EN61010.1:1993 ANSI/ISA S82.01-1994 CAN/CSA C22.2 No. 1010.
Model 187 & 189 Users Manual Table 1-1. Safety Information WWarning To avoid possible electric shock or personal injury, follow these guidelines: 1-2 • Do not use the meter if it is damaged. Before you use the meter, inspect the case. Look for cracks or missing plastic. Pay particular attention to the insulation surrounding the connectors. • Inspect the test leads for damaged insulation or exposed metal. Check the test leads for continuity. Replace damaged test leads before you use the meter.
Before You Start Safety Information 1 Table 1-1. Safety Information (cont.) WWarning • • • • • • • When using the probes, keep your fingers behind the finger guards on the probes. Connect the common test lead before you connect the live test lead. When you disconnect test leads, disconnect the live test lead first. Remove test leads from the meter before you open the battery door. Do not operate the meter with the battery door or portions of the cover removed or loosened.
Model 187 & 189 Users Manual Symbols Symbols used on the meter and in this manual are explained in Table 1-2. Table 1-2. International Electrical Symbols 1-4 AC (Alternating Current) Earth ground DC (Direct Current) Fuse AC and DC Double insulated Battery Important information Complies with relevant Canadian Standards Association directives Complies with European Union directives Inspected and licensed by TÜV Product Services. Underwriters Laboratories, Inc.
Chapter 2 Getting Acquainted Introduction Turning the Meter On Although this manual describes the operation of both Models 187 and 189, all illustrations and examples assume use of Model 189. Additional capabilities with Model 189 are discussed in Chapter 4. These capabilities include the following: To turn the meter on, turn the rotary switch from OFF to any switch setting. • An enhanced memory function that features an additional position (VIEW MEM) on the rotary switch.
Model 187 & 189 Users Manual Automatic Power Off tc031f.eps The display blanks and the meter goes into a “sleep” mode if you have not changed the rotary switch position or pressed a button for a set period. While in Sleep mode, pressing any button turns the meter on. The meter then returns to the display for the function selected with the rotary switch; all previously activated button features (HOLD, Hz, etc.) are discarded. Figure 2-1.
Getting Acquainted Battery Considerations 2 Automatic Backlight Off Low Battery Indication Press T to select the backlight level (low, high, or off.) In low or high, the backlight turns off automatically after a given period. This period is also preset to 15 minutes and can be set to a maximum of 99 minutes from the setup menu. If the period is set to 0, the backlight is on indefinitely and can only be turned off by pressing T or turning the meter off.
Model 187 & 189 Users Manual Rotary Switch The rotary switch is shown in Figure 2-2. Each position is described in Table 2-1. Turn the meter on by selecting any measurement function (identified with white letters around the rotary switch). The meter presents a standard display for that function (range, measurement units, modifiers, etc.) The display may also be influenced by some of the choices made in Setup. Use the blue button to select any rotary switch alternate function (labeled in blue letters).
Getting Acquainted Pushbuttons 2 Pushbuttons The buttons activate features that augment the function selected with the rotary switch. The buttons are shown in Figure 2-3 and described in Table 2-2. Use the blue button ( %) to access functions labeled in blue for some of the rotary switch positions. Table 2-1 defines all blue button functions. Use the yellow button ( O) followed by other buttons to access additional features. These features appear in yellow above the appropriate keys.
Model 187 & 189 Users Manual Table 2-1. Rotary Switch Selections Position % Blue Key Function Rotary Switch Function \ AC voltage measurement from 0 V to 1000.0 V dB over AC, AC over dB , AC millivolt measurement from 0 mV to 3000.0 mV dB over AC, AC over dB $ DC voltage measurement from 0 V to 1000.0 V AC over DC (AC in primary display, DC in secondary display), DC over AC, ac+dc m DC millivolt measurement from 0 mV to 3000.
Getting Acquainted Pushbuttons 2 Table 2-1. Rotary Switch Positions (cont.) % Blue Key Function Position Rotary Switch Function I AC current measurements from 0 mA to 20.000 A none AC current measurements from 0 µA to 5000.0 µA none DC current measurements from 0 mA to 20.000 A AC over DC (AC in primary display, DC in secondary display), DC over AC, ac+dc DC current measurements from 0 µA to 5000.
Model 187 & 189 Users Manual Table 2-2. Pushbuttons Button Yellow Button Function Description Description Note Press O to access “Yellow Button Functions.” The O box and the 24-hour clock appear in the lower corners of the display and the primary display freezes, allowing time to press a second button. T l Press to turn backlight on or off. Also, in Setup, use the arrow function (l) to select the previous digit or item in a list. Q Press to freeze the displayed value.
Getting Acquainted Pushbuttons 2 Table 2-2. Pushbuttons (cont.) Button [ ] R N % s Description • • • • • • • • In Setup, increment a digit . In counter functions, select positive pulse slope. In ohms continuity, select beep on open. In VIEW MEM, see Chapter 4 (Model 189). In Setup, decrement a digit . In counter functions, select negative pulse slope. In ohms continuity, select beep on short. In VIEW MEM, see Chapter 4 (Model 189). Exit AUTO and enter MANUAL ranging.
Model 187 & 189 Users Manual Selecting the Range Understanding the Display Press R to select either a fixed range or the autorange feature. Display features are shown in Figure 2-4 and described in Table 2-3. Major display features are described in the following paragraphs. Note Note You cannot use R in conductance, diode test, and temperature functions or with the REL, MIN MAX, and FAST MN MX features. These selections all use a specific fixed range.
Getting Acquainted Understanding the Display 2 • dB (in ac volts functions): the dBm or dBV value. Bar Graph • REL: the difference between the present reading and a stored reference reading. • Setup: various messages (see Chapter 5). • Overload conditions: OL displayed. • Error conditions. The bar graph provides an analog indication of the measured input. For most measurement functions, the bar graph updates 40 times per second.
Model 187 & 189 Users Manual 8 10 9 7 12 11 6 5 13 4 3 2 14 1 17 16 15 tc011f.eps Figure 2-4.
Getting Acquainted Understanding the Display 2 Table 2-3. Display Features Number Feature Description ~ Continuity test function is selected. < > Bar Graph. In normal operation 0 (zero) is on the left. In Relative %, 0 is in the center, negative values are to the left and positive to the right. The polarity indicator left of the bar graph shows the polarity of the input. Both polarity indicators appear in REL% mode. The arrow right of the bar graph indicates an overload condition.
Model 187 & 189 Users Manual Table 2-3. Display Features (cont.) Number Feature FAST MIN MAX AVG FAST MN MX mode is enabled. ( O M) ; Readings are being recorded in memory (Model 189 only.) ( O + D) g The meter is in Hold mode. ( Q) gS AutoHOLD is active. ( O + Q) 8.8.8.8.8 0L 2-14 Description Minimum reading displayed. Maximum reading displayed. Average reading displayed. Primary Display (4-1/2 digit) Overload input. Measurement Units V, mV V: Volts. The unit of voltage.
Getting Acquainted Understanding the Display 2 Table 2-3. Display Features (cont.) Number Feature Description AC+DC For dc volts and dc amps functions, reading represents the rms total of ac and dc measurements. e, ke Me, Ω: Ohm. The unit of resistance. kΩ: Kilohm. 1 x 103 or 1000 ohms. MΩ: Megohm. 1 x 106 or 1,000,000 ohms. nS S: Siemens. The unit of conductance. nS: Nanosiemens. 1 x 10-9 or 0.000000001 Siemens. nF, µF, mF °C ,°F A, mA, µA Hz, kHz, MHz F: Farad. The unit of capacitance.
Model 187 & 189 Users Manual Table 2-3. Display Features (cont.) Number Feature 51000 AUTO Description MANUAL Time Display. Used with HOLD, AutoHOLD, MIN MAX, FAST MN MX (SAVE, and LOGGING Model 189). fMS88:88 HM Elapsed Time Display (f on): shown in minutes:seconds to maximum of 59:59 - used if time since Min, Max, or Logging started is less than 60 minutes. Always used for Min, Max, Avg. Displays hours:minutes after 1 hour.
Getting Acquainted Using the Input Terminals 2 Using the Input Terminals * All functions except current use the and COM inputs. Current functions use the inputs shown below: • • I or K function: Use A and COM inputs from 400 A mA A COM V mA to 20 A. Use mA/µA and COM for inputs ≤ 400 mA. = or x function: Use mA/µA and COM for inputs ≤ 5000.0 µA.
Model 187 & 189 Users Manual Using Display Hold AutoHOLD Press Q to enter the Display Hold mode and freeze the present reading and its time stamp. New readings now appear in the secondary display. See Figure 2-6. To exit Display Hold mode, press Q again. Note The bar graph and secondary display may show different units in Capacitance and Ohms due to Autoranging. In the MIN MAX mode, Display Hold functions like a toggle, interrupting and resuming the MIN MAX operations.
Getting Acquainted Using AutoHOLD Using AutoHOLD WWarning AutoHOLD mode does not capture unstable or noisy readings. Do not use AutoHOLD mode to determine that circuits are without power. To enter AutoHOLD, press OQ(AutoHOLD). AutoHOLD mode freezes the present reading and its time stamp. New readings now appear in the secondary display. See Figure 2-6. When the meter detects a new, stable reading (>4% change from last stable reading), it beeps and displays the new reading in the primary display.
Model 187 & 189 Users Manual To exit MIN MAX mode, press O N (CANCEL) or turn the rotary switch to a different position. Also, MIN MAX mode turns off automatically when a flashing B (low battery condition) occurs. Note Minimum, maximum, and average values stored in the MIN MAX mode are lost when the meter is turned off.
Getting Acquainted Using FAST MN MX 2 Using FAST MN MX FAST MN MX can capture transient signal events as short as 250 µs, but with decreased accuracy; only 3-1/2 display digits are allowed. Activate FAST MN MX by pressing O M. As with regular MIN MAX, you can then press M to cycle through maximum, minimum, and average primary displays. The meter beeps for any new minimum or maximum value. Exit FAST MN MX by pressing ON (CANCEL) or by turning the rotary switch.
Model 187 & 189 Users Manual Using HOLD with MIN MAX or FAST MN MX • You can enable the HOLD mode when in the MIN MAX mode is by pressing Q. No further minimum, maximum, or average updates occur while the HOLD mode is enabled. Press D a second time to enter the REL% mode and display the difference as ± 10 % of the reference reading. In REL%, e% appears on the display. • Press D a third time to exit the Relative Mode. Exit HOLD mode by pressing Q a second time.
Chapter 3 Making Measurements Introduction Ranges available in volts functions are: Chapter 3 explains how to make measurements. Most measurement functions can be selected by using the rotary switch. • White letters or symbols identify primary functions; blue letters or symbols identify alternative functions. Press the blue button to access these alternate functions. Frequency-related functions can be selected (Hz, duty cycle, and pulse width) when the rotary switch is in any volts or amps position.
Model 187 & 189 Users Manual When measuring voltage, the meter acts like a 10 MΩ (10,000,000 Ω) impedance in parallel with the circuit. This loading effect can cause measurement errors in highimpedance circuits. In most cases, the error is negligible (0.1% or less) if the circuit impedance is 10 kΩ (10,000 Ω) or less. 189 LOGGING MULTIMETER Measuring AC Voltage The meter presents ac voltage values as rms (root mean square) readings.
Making Measurements Measuring Voltage 3 dB Measurements in AC Volts Functions The two ac volts functions allow you to display readings as deviations in dB (decibels) above or below an established level. Set up dB measurements with the following procedure: 1. Make an ac volts measurement to be used as a reference point. 2. Press % to select dB. The dBm (or dBV) value appears in the primary display and the ac volts reading appears in the secondary display. A typical dB display appears in Figure 3-2. 3.
Model 187 & 189 Users Manual dB is calculated with the following formula: Vx dB = 20 * log10 Vr • • For dBm, Vr is the voltage across the reference resistance at 1 mW. For example, Vr would be 0.7746 V with a 600 Ω reference resistance. For dBV, the reference voltage (Vr) is 1 V. Measuring DC Voltage Set up the meter for dc voltage measurement as shown in Figure 3-4. All pushbutton features are available for a standard dc volts reading.
Making Measurements Measuring Voltage AC over DC DC over AC 3 AC + DC tc024f.eps Figure 3-3.
Model 187 & 189 Users Manual Measuring Resistance 189 AutoHOLD FAST MN MX LOGGING HOLD MIN MAX REL CANCEL SAVE Hz % ms RANGE SETUP ac+dc V To avoid possible damage to the meter or to the equipment under test, disconnect circuit power and discharge all high-voltage capacitors before measuring resistance. YES NO Resistance is an opposition to current flow. The unit of resistance is the ohm (Ω). The meter measures resistance by sending a small current through the circuit.
Making Measurements Measuring Resistance In-Circuit Resistance Measurements 3 Isolating a Potentiometer Circuit Power OFF 1 189 3 2 LOGGING MULTIMETER Disconnect 2 1 AutoHOLD FAST MN MX HOLD MIN MAX YES CANCEL SAVE RANGE NO nS Isolating a Resistor nS ac+dc ac+dc F mV C A mA V mV A V A mA dB 3 REL Hz % ms SETUP dB LOGGING ac+dc A OFF ac+dc VIEW CLEAR MEM TEMPERATURE mA A A 10A MAX FUSED V COM 400mA FUSED CAT 1000V Disconnect ach004f.eps Figure 3-5.
Model 187 & 189 Users Manual Keep the following in mind when measuring resistance: • • Because the meter’s test current flows through all possible paths between the probe tips, the measured value of a resistor in a circuit is often different from the resistor’s rated value. The test leads can add 0.1 Ω to 0.2 Ω of error to resistance measurements. To test the leads, touch the probe tips together and read the resistance of the leads. If necessary, you can press D to automatically subtract this value.
Making Measurements Using Conductance for High Resistance Tests Continuity testing provides you with both a visual indication of the state encountered (usually near 0 resistance for a short or OL for an open) and an audible beep when the input is low. In continuity, a short means a measured value less than 5% of full scale. You can raise this threshold by manually selecting a higher range.
Model 187 & 189 Users Manual For in-circuit tests, turn circuit power off. 189 LOGGING MULTIMETER AutoHOLD FAST MN MX HOLD MIN MAX YES CANCEL SAVE RANGE NO ac+dc FAST MN MX HOLD MIN MAX F mV C mV A V A mA ac+dc A OFF ac+dc VIEW 1 Press to select “ ac+dc dB SAVE Hz % ms RANGE F mV C A mA mV A V A mA dB A OFF .
Making Measurements Using Conductance for High Resistance Tests 3 The following are some tips for measuring conductance: 189 nS FAST MN MX LOGGING HOLD MIN MAX REL ac+dc CANCEL SAVE Hz % ms RANGE YES There is normally a residual conductance reading with the test leads open. To ensure accurate readings, press D with the test leads open to subtract the residual value. NO F mV C A mA V mV A V A mA dB • nS ac+dc dB High-resistance readings are susceptible to electrical noise.
Model 187 & 189 Users Manual Measuring Capacitance Caution To avoid possible damage to the meter or to the equipment under test, disconnect circuit power and discharge all high-voltage capacitors before measuring capacitance. Use the dc voltage function to confirm that the capacitor is discharged. Capacitance is the ability of a component to store an electrical charge. The unit of capacitance is the farad (F). Most capacitors are in the nanofarad (nF) to microfarad (µF) range.
Making Measurements Testing Diodes 3 Testing Diodes Caution 189 LOGGING MULTIMETER AutoHOLD FAST MN MX HOLD MIN MAX YES REL CANCEL SAVE Hz % ms RANGE SETUP NO ac+dc F mV C A mA V mV A V A mA dB Use the diode test to check diodes, transistors, silicon controlled rectifiers (SCRs), and other semiconductor devices. The test sends a current through a semiconductor junction, then measures the junction’s voltage drop. A typical junction drops 0.5 V to 0.8 V.
Model 187 & 189 Users Manual Typical Reading 189 AutoHOLD FAST MN MX HOLD MIN MAX YES REL SAVE Hz % ms RANGE ac+dc MIN MAX C ac+dc A mA A V A mA ac+dc A OFF Press for Diode Test + ac+dc dB LOGGING SAVE Hz % ms RANGE C A mA mV A V A mA dB A OFF ac+dc ac+dc VIEW CLEAR MEM V COM 400mA FUSED + ac+dc TEMPERATURE mA A Reverse Bias F mV VIEW 10A MAX FUSED NO V CLEAR MEM A YES REL CANCEL nS Forward Bias F mV mV dB FAST MN MX HOLD SETUP V LOGGING M
Making Measurements Measuring Temperature 3 Measuring Temperature To measure temperature, set up the meter as shown in Figure 3-10. The meter begins temperature measurement in the degree units last used (Celsius °C or Fahrenheit °F). Once you have selected the temperature function, you can change units by pressing the blue button. The meter remembers the units selected until they are changed. The primary display shows either the temperature or the message ‘0PEn’ (for an open thermocouple condition).
Model 187 & 189 Users Manual Measuring Current WWarning Never attempt an in-circuit current measurement where the open-circuit potential to earth is greater than 1000 V. You may damage the meter or be injured if the fuse blows during such a measurement. To measure ac or dc current, proceed as follows: 1. Turn off power to the circuit. Discharge all highvoltage capacitors. 2. Insert the black lead into the COM terminal.
Making Measurements Measuring Current 3. 4. If you are using the A terminal, set the rotary switch to mA/A. If you are using the mA/µA terminal, set the rotary switch to µA for currents below 5000 µA (5 mA), or mA/A for currents above 5000 µA. Open the circuit path to be tested. Touch the red probe to the more positive side of the break; touch the black probe to the more negative side of the break. Reversing the leads will produce a negative reading, but will not damage the meter. 5.
Model 187 & 189 Users Manual The following are some tips for measuring current: Measuring AC Current • If the display shows LEAd5 and you are sure the meter is set up correctly, test the meter’s fuses as described under "Testing the Fuses" in Chapter 6. To measure ac current, set up the meter as shown in Figure 3-11. • A current meter drops a small voltage across itself, which might affect circuit operation.
Making Measurements Measuring Current 189 AutoHOLD FAST MN MX HOLD MIN MAX YES REL SAVE Hz % ms RANGE ac+dc F mV C A mA V A mV dB FAST MN MX HOLD MIN MAX A mA V A mA YES REL SAVE Hz % ms RANGE ac+dc F mV C A mA A mA V ac+dc OFF ac+dc RANGE V CAT 1000V NO F mV C A mA V dB A ac+dc A OFF ac+dc VIEW CLEAR MEM TEMPERATURE mA A A 10A MAX FUSED V COM 400mA FUSED A A mA V VIEW COM 400mA FUSED Hz % ms CLEAR MEM TEMPERATURE mA A SAVE mV ac+dc VI
Model 187 & 189 Users Manual Measuring DC Current To measure dc current, set up the meter as shown in Figure 3-12. You can view separate dc and ac amps signal components. • Press % once to display ac current in the primary display and dc current in the secondary display (ac over dc). • Press % a second time to reverse the displays (dc over ac). In either of these states, the following pushbutton functions are not available: Display hold ( Q).
Making Measurements Measuring Current Circuit Power: OFF to connect meter. ON for measurement. OFF to disconnect meter. 189 FAST MN MX HOLD MIN MAX LOGGING YES REL CANCEL SAVE Hz % ms RANGE NO Current through one component nS ac+dc ac+dc dB F mV C A mA V mV A V A mA dB Total current to circuit LOGGING MULTIMETER AutoHOLD SETUP 3 ac+dc A mA ac+dc A OFF ac+dc TEMPERATURE mA A A 10A MAX FUSED V COM 400mA FUSED CAT 1000V ach007f.eps Figure 3-12.
Model 187 & 189 Users Manual Measuring Frequency nS Frequency is the number of cycles a signal completes each second. The meter measures the frequency of a voltage or current signal by counting the number of times the signal crosses a threshold level each second. Figure 3-13 highlights the function selections that allow frequency measurement. To measure frequency, select an appropriate function, connect the meter signal source, and press N. The meter autoranges to one of four frequency ranges: 500.
Making Measurements Measuring Duty Cycle 3 The following are some tips for measuring frequency: tc026f.eps Figure 3-14. Hz Display The meter beeps to indicate when a particular pushbutton is not allowed when measuring frequency. The following are some general rules. • Relative ( D), Hold ( Q), and MIN MAX ( M)can be used. • FAST MN MX ( O M) cannot be used. • If a reading shows as 0 Hz or is unstable, the input signal may be below or near the trigger level.
Model 187 & 189 Users Manual Measures Positive Pulse +Slope Trigger Point -Slope Trigger Point 30% Above Trigger Point 100% Measures Negative Pulse -Slope Trigger Point +Slope Trigger Point 70% Below Trigger Point 100% tc009f.eps Figure 3-15.
Making Measurements Measuring Pulse Width To measure duty cycle, set up the meter to measure frequency; then press N a second time. You can select the level the meter uses by pressing [ to trigger on the positive slope or ] to trigger on the negative slope. A typical duty cycle display is shown in Figure 3-16. 3 input range will often measure better than the AUTOselected input range.
Model 187 & 189 Users Manual Start and Stop on Positive Slope +Slope Trigger Point Pulse Width 1 Period = Frequency Start and Stop on Negative Slope -Slope Trigger Point Pulse Width Period tc020f.eps Figure 3-17.
Making Measurements Measuring Pulse Width 3 The meter measures pulse width in the 500.00 or 1000.0 ms ranges. To measure pulse width, set up the meter to measure frequency; then press N two more times. As with the duty cycle function, you can select which level the meter uses by pressing [ to trigger on the positive slope or ] to trigger on the negative slope. A typical pulse width display is shown in Figure 3-18. You can improve pulse width stability by selecting the averaging feature.
Chapter 4 Using Memory & Communications Features Introduction Logged Readings Memory Chapter 4 shows you how to use memory and communication features available on the meters. The logging interval (Log Int) can be set using the meter or FlukeView Forms. You can view the average reading for each logging interval on the meter’s display. A scheduled logging interval may contain stable and unstable logged readings. Unstable logged readings represent unstable events as defined by the AutoHOLD function.
Model 187 & 189 Users Manual Storing Saved Readings Starting Logging To add the current displayed reading to the saved readings memory, press O R (SAVE). To begin logging, press O D(LOGGING). • 5AVEd appears briefly to confirm the operation and the index number display increments by one. • FULL appears if no room is available in the saved readings memory (after 100 saves). Saved readings can be viewed later as originally displayed.
Using Memory & Communications Features Viewing Memory Data Viewing Memory Data 3. The primary display shows memory data. Refer to Figure 4-1 for an explanation of the VIEW MEM display. 4. If the primary display data is a logged reading, ; appears in the display. You can switch between the two types of memory data. Use the following procedure to view memory data: Note Viewing memory data involves turning the rotary switch from its current function. Selections are not retained when you turn the switch.
Model 187 & 189 Users Manual Table 4-1. View Display No. 3 2 4 1 7 6 5 tc035f.eps Figure 4-1. View Display 4-4 Item Description q arrow icons. Denotes use of [ or ] to select higher or lower index numbers. Z symbol Hazardous voltage could be present at inputs. ; Identifies that the average of a logging interval is displayed. When off, a saved reading is displayed. Memory data Shows logged readings or secondary readings.
Using Memory & Communications Features Clearing Memory Clearing Memory You can clear memory in two ways. • First, If the rotary switch is in the VIEW MEM position, you can press the blue button (%) to activate the CLEAR MEM function. CLr.? appears in the display. You are then prompted to press [ (YES) to clear the type of memory presently in use or ] (NO) to stop the clear procedure. The display defines the type of memory to be cleared, as: ; to clear logged readings memory.
Chapter 5 Changing the Default Settings Introduction The meter allows you to change the default operating configuration of the meter by changing setup options made at the factory. Many of these setup options affect general meter operations and are active in all functions. Others are limited to one function or group of functions. These settings are stored and can be changed in the Setup mode using the procedure described in this chapter.
Model 187 & 189 Users Manual Table 5-1. Function Specific Setup Selections Selection Precondition 000.0 °C or 000.0 °F Temperature ( w ) selected. L Int Model 189 only. Choices ( < > ) Option Temperature offset adjust Factory Default 000.0 ° to ±100.0 °C(180.0°F) - Use q to increment or decrement digit. 000.0 °C (or °F) Use < > to select digit. Selected digit flashes. Log interval MM:SS - Use q to increment or decrement minute or second values. 15:00 Use < > to select minute or seconds.
Changing the Default Settings Selecting Setup Options 5 Table 5-2. Common Setup Selections Selection Option bEEP Beeper 8888 Display digits bLoFF Backlight time out Choices yE5 or no (flashing) Use < > to select. 8888 (4) or 88888 (5) Use < > to select. MM:SS - Use q to increment or decrement minute or second values. Factory Default yE5 88888 15:00 Use < > to select minutes or seconds. Selected values flash. Setting value to 00:00 disables timeout.
Model 187 & 189 Users Manual Select and edit setup options as follows: Adjusting the Temperature Offset • Turn the rotary switch to a measurement function: • Press O T to advance to the next setup option and save the present selection. If the meter is in a temperature measurement function, use the following procedure to set an offset for your temperature probe: • Press [ to increase or ] to decrease a value. • Press T (l) to go back to the previous digit or selection.
Changing the Default Settings Adjusting the Temperature Offset 5 If necessary, adjust the temperature offset until the temperature on the primary display matches the temperature indicated by the lag bath thermometer. 1. Press % ( s) to advance to the next digit and press T (l) to go back to the previous digit. 2. Press [ or ] to increase or decrease the digit value. 3. Save changes by pressing O T. 4. Press O N to exit Setup. tc041f.eps Figure 5-1.
Model 187 & 189 Users Manual Selecting Display Resolution (3 1/2 or 4 1/2 Digits) Setting the Power Off Timeout 1. For most functions, you can choose whether the meter displays the reading in 3-1/2 or 4-1/2 digits. • The 3-1/2 digit setting provides lower resolution with faster response time. • The 4-1/2 digit setting provides greater resolution with slower response time. The 4-1/2 digit display is available with all functions except continuity, conductance, capacitance, and FAST MN MX.
Changing the Default Settings Setting the 24-Hour Clock 5 Setting the 24-Hour Clock 3. Press % ( s) to advance to the minute setting; the minute digits begin flashing. The meter uses 24-hour clock readings as time stamps during HOLD, AutoHOLD, MIN MAX, FAST MN MX, SAVE, and LOGGING operations. 4. Press [ or ] to increase or decrease the minute value. Hours and minutes to a maximum of 23:59 can be set. 5. Press O T to store the selection and proceed to the next selection.
Model 187 & 189 Users Manual Returning to Factory Defaults Saving Setup Options Your meter comes with the setup options preset at the factory. These factory settings are shown in Tables 5-1 and 5-2. You can always return to these settings as follows: At each setup option, store your choice and advance to the next option by pressing O T. 1. Press O T until Fcty appears in the display. 2. Press % to select yE5; press T to select no.
Chapter 6 Maintenance Introduction 3. This chapter describes basic operator maintenance. For calibration and performance test information, order the 187 & 189 Service Manual, PN 1584337. Testing the Fuses General Maintenance Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Dirt or moisture in the terminals can affect readings and can falsely activate the Input Alert feature. Clean the terminals as follows: 1.
Model 187 & 189 Users Manual Replace F2 if " displayed or " Replace F1 if " displayed 189 LO GGIN G or 189 LO GGIN G MUL TIMET ER FAST MN MIN MAX HOLD Hz % m ac+d c dB dB V ac+d c O FF A VIE CLEA W RM EM 10A FUSEMAX D mA A 400m FUSE A D CO M TEMP ERAT ac+d c C F A mA A A mA ac+d c dB dB V A VIE CLEA W RM EM A 10A FUSEMAX D URE V CA 1000T V mA A 400m FUSE A D CO M YES SAVE RAN GE NO mV mV V O FF A mA LOGG ING REL s nS NO mV mV Hz % m SETU P SAVE RAN GE
Maintenance Replacing the Batteries Replacing the Batteries Replace the batteries with four AA batteries (NEDA I5A or IEC LR6). WWarning To avoid false readings, which could lead to possible electric shock or personal injury, replace the batteries as soon as the battery indicator (B) appears. 6 Replace the batteries as follows (refer to Figure 6-2): 1. Turn the rotary switch to OFF and remove the test leads from the terminals. 2.
Model 187 & 189 Users Manual F2 F1 tc037f.eps Figure 6-2.
Maintenance Replacing the Fuses Replacing the Fuses W Warning To avoid electrical shock or damage to the meter, only use replacement fuses specified in Table 6-1. Referring to Figure 6-2, examine or replace the meter’s fuses as follows: 1. Turn the rotary switch to OFF and remove the test leads from the terminals. 2. Remove the battery acccess door by using a standard-blade screwdriver to turn the battery door screws one-quarter turn counterclockwise. 3.
Model 187 & 189 Users Manual Table 6-1. User-Replaceable Parts Description Reference Designators Part Number Qty Access Door, Battery / Fuse MP14 666446 1 Tilt-Stand MP8 659026 1 Accessory Mount MP9 658424 1 WFuse, 0.44 A (44/100 A, 440 mA), 1000 V, FAST F1 943121 1 WFuse, 11 A,1000 V FAST F2 803293 1 Battery, 1.
Chapter 7 Specifications Safety and Compliances Maximum voltage between any terminal and earth ground. 1000 V dc or rms ac Compliances - DUAL RATINGS Complies with IEC 1010-1 to 1000 V Overvoltage Category III, Pollution Degree 2; and IEC 664-1 to 600 V Overvoltage Category IV, Pollution Degree 2 * CSA per standard CSA/CAN C22.2 No. 1010.1-92 UL per standard UL 3111 TÜV per standard EN 61010 Part 1-1993 8 kV peak per IEC 1010.1-92 0.
Model 187 & 189 Users Manual Physical Specifications Display (LCD) Operating Temperature Storage Temperature Temperature Coefficient Relative Humidity Altitude Battery Type Battery Life Shock Vibration Electromagnetic Compatibility (EMC) Size Weight Warranty Calibration Interval 7-2 Digital: 50000/5000 counts primary display, 5000 counts secondary display; updates 4/second. Analog: 51 segments, updates 40/second. − 20 °C to + 55 °C − 40 °C to + 60 °C 0.
Specifications Feature Summary 7 Feature Summary Feature Dual Digital Displays Description Analog Bar Graph Primary: 50,000 counts Secondary: 5,000 count Bar graph: 51 segments, updates 40 times/second Backlight with 2 brightness levels Bright white backlight for clear readings in poorly lighted areas Fast Autorange Meter automatically selects best range - instantly AC+DC true rms, ac rms specified to 100 kHz Choices for AC only, AC and DC dual display, or AC+DC readings dBm, dBV User selectabl
Model 187 & 189 Users Manual Basic Specifications Function Ranges/Description DC Voltage 0 to 1000 V AC Voltage, true RMS 2.5 mV to 1000 V – 100 kHz bandwidth Basic Accuracy DC voltage: 0.025 % AC voltage: 0.4 % DC Current 0 to 10 A (20 A for 30 seconds) AC Current, true RMS 25 µA to 10 A (20 A for 30 seconds) Resistance 0 to 500 MΩ Conductance 0 to 500 nS Capacitance 0.001 nF to 50 mF Diode Test 3.1 V Temperature −200 °C to 1350 °C (−328 °F to 2462 °F) Frequency 0.
Specifications Detailed Accuracy Specifications 7 Detailed Accuracy Specifications Accuracy is specified for a period of one year after calibration, at 18 °C to 28 °C (64 °F to 82 °F), with relative humidity to 90 %. Accuracy specifications are given as: ± ( [ % of reading ] + [ number of least significant digits ] ) AC mV, AC V, AC µA, AC mA, and AC A specifications are ac coupled, true rms and are valid from 5 % of range to 100 % of range. AC crest factor can be up to 3.0 at full-scale, 6.
Model 187 & 189 Users Manual Accuracy Function AC µA AC mA AC A Range Resolution 45-1 kHz 20-45 Hz 1-20 kHz 500.00 µA 0.01 µA 0.75 % + 20 1 % + 20 0.75 % + 20 6 % + 40 5,000.0 µA 0.1 µA 0.75 % + 5 1% + 5 0.75 % + 10 2 % + 40 50.000 mA 0.001 mA 0.75 % + 20 1% + 20 0.75 % + 20 9 % + 40 400.00 mA 0.01 mA 0.75 % + 5 1% + 5 1.5 % + 10 4 % + 40 5.0000 A 0.0001 A 1.5 % + 20 1.5% + 20 6 % + 40 Not specified 0.001 A 1.5 % + 5 1.5% + 5 5 % + 10 Not specified 10.000 A 1 1.
Specifications Detailed Accuracy Specifications Accuracy Function DC mV DC V DC µA DC mA DC A Range Resolution DC 50.000 mV 0.001 mV 0.1% + 20 500.00 mV 0.01 mV 0.03 % + 2 3000.0 mV 0.1 mV 0.025 % + 5 Accuracy Dual Display AC or AC+DC 20 - 45 Hz 2 % + 80 45 Hz - 1 kHz 0.5 % + 40 3 1 kHz- 20 kHz 6 % + 40 2 % + 40 2 5.0000 V 0.0001 V 0.025 % + 10 50.000 V 0.001 V 0.03 % + 3 500.00 V 0.01 V 0.1 % + 2 2 Not specified 2 Not specified 2 1000.0 V 0.1 V 0.1 % + 2 500.
Model 187 & 189 Users Manual Function Resistance 1 Conductance Range Resolution Accuracy 500.00 Ω 0.01 Ω 0.05 % + 10 5.0000 kΩ 0.0001 kΩ 0.05 % + 2 50.000 kΩ 0.001 kΩ 0.05 % + 2 500.00 kΩ 0.01 kΩ 0.05 % + 2 5.0000 MΩ 0.0001 MΩ 0.15 % + 4 5.000 MΩ up to 32.000 MΩ 0.001 MΩ 1.0 % + 4 2 32.0 MΩ up to 50.0 MΩ 0.1 MΩ 3.0 % + 2 4 50.0 MΩ up to 100.0 MΩ 0.1 MΩ 3.0% + 2 100.0 MΩ up to 500.0 MΩ 0.1 MΩ 10.0 % + 2 50.00 nS 0.01 nS 1 % + 10 4 1.
Specifications Detailed Accuracy Specifications Function Capacitance Diode Test 1 2 Ranges Resolution Accuracy 1.000 nF 0.001 nF 2% + 5 10.00 nF 0.01 nF 1%+5 100.0 nF 0.1 nF 1.000 µF 0.001 µF 10.00 µF 0.01 µF 100.0 µF 0.1 µF 1,000 µF 1 µF 10.0 mF 0.01 mF 50.00 mF 0.01 mF 3.1000 V 0.0001 V 3 7 3 % + 10 2 % + 20 1. For the 5,000 count mode, divide the number of least significant digits (counts) by 10. 2.
Model 187 & 189 Users Manual Function Frequency Range Resolution 1 Accuracy ± (0.0050 % + 1) 500.00 Hz 0.01 Hz 5.0000 kHz 0.0001 kHz 50.000 kHz 0.001 kHz 999.99 kHz 0.01 kHz Duty Cycle 10.00% to 90.00 % 0.01 % ± ((voltage range/input voltage) X 300 counts) Pulse Width 499.99 ms 0.01 ms ± (3 % X (voltage range/input voltage) + 1 count) 999.9 ms 0.1 ms Temperature MIN MAX AVG FAST MN MX −200 to +1350 °C 0.1 °C ± ( 1% of reading + 1 °C) −328 to +2462 °F 0.
Specifications Frequency Counter Sensitivity 7 Frequency Counter Sensitivity Input Range 50 mV 500 mV 3000 mV 5V 50 V 500 V 1000 V Approximate VAC Sensitivity 1 (RMS Sine Wave) 15 Hz to 2 2 100 kHz 500 kHz 5 mV 20 mV 500 mV 0.5 V 5V 20 V 100 V 10 mV 20 mV 2000 mV 2.0 V 5.0 V 20 V 100 V VAC Bandwidth 1 MHz 1 MHz 800 kHz 950 kHz 1 MHz 1 MHz > 400 kHz 3 Approximate VDC 1 Trigger Levels -5 mV & 5 mV 5 mV & 65 mV 140 mV & 200 mV 1.4 V & 2.0 V 0.5 V & 6.
Model 187 & 189 Users Manual Input Characteristics Function Input Impedance (Nominal) Volts, mV 10 MΩ, < 100 pF Common Mode Rejection Ratio DC Volts, mV >100 dB at dc, 50 Hz or 60 Hz ±0.1% AC Volts, mV > 90 dB dc to 60 Hz Normal Mode Rejection >90 dB at 50 Hz or 60 Hz ± 0.1% Full-Scale Voltage Open Circuit Test Voltage Ohms <5V Diode Test <5V To 5 MΩ 30 MΩ + nS 500 mV 3.1 V 3.