Fluke 187 Calibration Manual
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Fluke 187 Calibration Manual

True rms multimeter
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187/189
True RMS Multimeter
Calibration Manual
PN 1584337
November 2000
© 2000 Fluke Corporation, All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.

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  • Page 1 ® 187/189 True RMS Multimeter Calibration Manual PN 1584337 November 2000 © 2000 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies.
  • Page 2 For ten years from the date of purchase, this warranty also covers the LCD. Thereafter, for the lifetime of the DMM, Fluke will replace the LCD for a fee based on then current component acquisition costs.

  • Page 3: Table Of Contents

    Table of Contents Title Page Introduction ....................... 1 Contacting Fluke ....................1 Precautions and Safety Information ..............2 International Symbols..................2 Safety Information..................... 3 Specifications ....................4 Accuracy ....................... 4 Feature Summary ..................4 Basic Specifications ..................5 Detailed Accuracy Specifications ..............6 Frequency Counter Sensitivity ................
  • Page 4 187/189 Calibration Manual Remote Interface ................... 25 Temperature Calibration ................25 Setup ......................25 Procedure ....................26 Re-Programming Serial Number or Model Number........26 Parts and Accessories ..................27...
  • Page 5 List of Tables Table Title Page International Symbols .................... 2 Required Tools and Equipment ................10 Temperature Test Input and Display ..............17 Performance Test Steps ..................18 Calibration Inputs ....................23...
  • Page 6 187/189 Calibration Manual...
  • Page 7 List of Figures Figure Title Page Removing LCD Mask to Access LCD..............12 Testing the Current Fuses ..................14 Battery and Fuse Replacement ................15 Display Test ......................16 Locating Recessed Calibration Button ..............21 Calibration Display....................22 Replacement Parts and Accessories............... 28...
  • Page 8 187/189 Calibration Manual...

  • Page 9: Introduction

    Follow the standard practices for handling static sensitive devices. The information in this manual deals with the Fluke Models 187 & 189 True RMS Multimeters, (hereafter referred to as “the meter”). Information provided includes: • Precautions and safety information •...

  • Page 10: Precautions And Safety Information

    187/189 Calibration Manual Precautions and Safety Information WWarning If this product is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. Read the “Safety Information” page before servicing this product. In this manual, a Warning identifies conditions and actions that pose hazard(s) to the user;...

  • Page 11: Safety Information

    True RMS Multimeter Safety Information Safety Information WWarnings and Precautions To avoid possible electric shock or personal injury, follow these guidelines: • 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.

  • Page 12: Specifications

    187/189 Calibration Manual Specifications Accuracy 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...

  • Page 13: Basic Specifications

    True RMS Multimeter Basic Specifications 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) 25 µA to 10 A (20 A for 30 seconds) AC Current, true RMS...

  • Page 14: Detailed Accuracy Specifications

    187/189 Calibration Manual 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...
  • Page 15 True RMS Multimeter Detailed Accuracy Specifications Accuracy Accuracy Dual Display AC or AC+DC 20 Hz- 45 Hz - 1 kHz- Function Range Resolution 45 Hz 1 kHz 20 kHz DC mV 50.000 mV 0.001 mV 0.1% + 20 2 % + 80 0.5 % + 40 6 % + 40 500.00 mV...
  • Page 16 187/189 Calibration Manual Function Ranges Resolution Accuracy Capacitance 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...

  • Page 17: Frequency Counter Sensitivity

    True RMS Multimeter Frequency Counter Sensitivity Frequency Counter Sensitivity Approximate VAC Sensitivity (RMS Sine Wave) Approximate Input VDC Trigger 15 Hz - Range Bandwidth Levels VDC Bandwidth 100 kHz 500 kHz 50 mV 5 mV 10 mV 1 MHz -5 mV & 5 mV 1 MHz 500 mV 20 mV...

  • Page 18: Required Equipment

    Temperature Range: -10 to 350 °C Accuracy: 0.3% Thermocouple Adapter K-type Fluke 80AK Accessory K-type Thermocouple K-type, mini-plug on both ends Serial Cable, Infrared Fluke P/N 1578406 Fluke P/N 676152 87/89-IV, 187/189 Service Software IR Cable Adapter Fluke P/N 1576688...

  • Page 19: Basic Maintenance

    True RMS Multimeter Basic Maintenance Basic Maintenance WWarning To avoid electrical shock or personal injury, remove the test leads and any input signals before opening the case or replacing the battery or fuses. To prevent damage or injury, install ONLY batteries or fuses specified for this product. Opening the Meter Case Caution To avoid unintended circuit shorting, always place the...

  • Page 20: Replacing The Lcd

    187/189 Calibration Manual Replacing the LCD If you need to replace the LCD, you will find it easier to leave the LCD assembly attached to the circuit board and access the LCD by removing the LCD mask from the front of the LCD assembly.

  • Page 21: Reassembling The Meter Case

    True RMS Multimeter Basic Maintenance Reassembling the Meter Case To reassemble the Meter case, do the following: 1. Verify that the rotary switch is in the position. 2. Reinsert the circuit board by placing it into the case top with the LCD showing through the window.

  • Page 22: Replacing Fuses

    187/189 Calibration Manual Replace F2 if " " Replace F1 if " " displayed displayed ach038f.eps Figure 2. Testing the Current Fuses Replacing Fuses WWarning To avoid electrical shock, remove the test leads and any input signals before replacing the battery or fuses. To prevent damage or injury, INSTALL ONLY specified fuses and batteries.

  • Page 23: Cleaning

    True RMS Multimeter Basic Maintenance To replace the batteries, refer to Figure 3 and do the following: 1. Turn the rotary switch to and remove the test leads from the terminals. 2. Remove the battery door by using a standard-blade screwdriver to the turn the battery door fasteners one-quarter turn counterclockwise.

  • Page 24: Performance Tests

    The following performance tests will ensure that the Meter is in proper operating condition and will check the accuracy of each meter function against its specifications. To perform the tests you will need a Fluke 5520A Calibrator or equipment meeting the minimum specification given in Table 1.

  • Page 25: Keypad Test

    1. Connect the Infrared Serial Cable to the com port of a PC. 2. Connect the Infrared Serial Cable to the IR Cable Adapter and insert into the 187/189 accessory mount so that it is flush with the IR adapter window. Turn the Meter rotary switch to DC V.

  • Page 26: Testing Voltage, Current, Resistance, Capacitance And Diode Functions

    187/189 Calibration Manual Testing Voltage, Current, Resistance, Capacitance and Diode Functions To verify the accuracy of Meter functions, do the following. 1. Connect the Calibrator to the inputs on the Meter. 2. Turn the rotary switch to the function listed in each step.
  • Page 27 -49.930 -50.070 DC mV 500.00 mV DC mV 500.00 mV 500 mV 499.83 500.17 187 and 189 test limits are different for 3000.0 dc mV range DC mV 3000.0 mV +2 V 1999.0 2001.0 DC mV 3000.0 mV -3 V -2998.7...
  • Page 28 187/189 Calibration Manual Table 4. Performance Test Steps (cont.) Display Frequency or Lower Upper Step Function Range Input Level Model Limit Limit AC uA 5000.0 uA 1.5 mA 1 kHz 1488.2 1511.8 DC mA 50.000 mA -0.010 0.010 DC mA 50.000 mA...

  • Page 29: Calibration

    True RMS Multimeter Calibration Calibration Calibrate the Meter once a year to ensure that it performs to specifications. Before you begin the calibration procedure, locate the recessed calibration button on the back of the Meter, underneath the accessory mount. It is inside a small opening covered by a seal.

  • Page 30: General Procedure

    187/189 Calibration Manual Function indicator UP button moves to the Autoranging next step is disabled for calibration Calibration step number Input signal required Calibration mode indicator aau01f.eps Figure 6. Calibration Display General Procedure A sequence of signal inputs is required for each function that must be calibrated. The secondary display shows the required input next to the step number for that function.

  • Page 31: Special Requirements

    True RMS Multimeter Calibration Special Requirements DC mV calibration will affect the calibration of all other functions. Therefore, the DC mV function must be calibrated before calibrating any other function. Similarly, AC mV must be calibrated before any AC function, but after DC mV. The remaining functions may be calibrated in any order.
  • Page 32 187/189 Calibration Manual Table 5. Calibration Inputs (cont.) Step Value Frequency Time to Settle (In Seconds) AC V 700 Hz 50 V 700 Hz 500 V 700 Hz 500 V 700 Hz DC V 50 V 500 V 500 V...

  • Page 33: Remote Interface

    Remote Interface You can perform semi-automated calibration with the remote interface using MET/CAL software. Temperature Calibration Required equipment: • Fluke 87/89-IV, 187/189 Service Software, Fluke P/N 676152 • Infrared Serial Cable, Fluke P/N 1578406 • IBM compatible PC • Fluke 80T-150U with accuracy certified to +0.2 °C •...

  • Page 34: Procedure

    Meter. Do this as follows: 1. Connect the IR Serial Cable to the serial com port of the PC. Install 87/89-IV, 187/189 Service Software (Fluke P/N 676152). 2. Turn the Meter rotary switch to any function. 3. On the Service Software menu screen, click .

  • Page 35: Parts And Accessories

    True RMS Multimeter Parts and Accessories Parts and Accessories Replacement parts and accessories are listed in Table 6 and identified in Figure 7 by the reference designator. Table 6. Replacement Parts and Accessories Reference Description Designators Part Number Access Door, Battery / Fuse MP14 666446 Tilt-Stand...
  • Page 36 187/189 Calibration Manual MP31 MP38 MP30 MP39 H8,9,10,11 MP14 MP34 aau03f.eps Figure 7. Replacement Parts and Accessories...
  • Page 37 The revision letter stamped on the indicated PCA is equal to or higher than that given with each change. No revision letter is indicated at the beginning of the change. © 2000 Fluke Corporation. All rights reserved. Printed in the U.S.A.
  • Page 38 Upper Linit -0.02 0.02 -4987.3 -5012.7 -0.2 On page 25, under Temperature Calibration , replace the second bullet with: • Infrared Serial Cable Kit, Fluke P/N 1590638 Under Optional equipment, delete the following: • IR Cable Adapter, Fluke P/N 1576688 12/00...

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