Fluke 187 - Procedure; Re-Programming Serial Number or Model Number

187/189
Calibration Manual
26
Procedure
While the rotary switch is in the OFF position, insert the certified 80T-150 probe into the
Meter’s
COM terminal (same temperature as reference junction). Make sure the probe tip
makes firm contact with the bottom of the terminal. Measure and record the
COM
terminal temperature in units of 1/100 °C. Do not convert this number to Fahrenheit,
even if the Meter is using the Fahrenheit scale for its display output.
Turn the rotary switch to the temperature position. It does not matter whether the Meter
is in calibration mode. On the Service Software menu screen, click
°
C Ref. Junction
.
Enter the measured temperature value in the text box and click
OK. This sends the
recorded reference junction temperature to the Meter through the IR Serial Cable.
Although the temperature calibration is not yet complete, it is safe at this point to turn
the Meter off if the need arises. Doing so will not invalidate the previous steps.
To complete the temperature calibration, the DC mV function must be calibrated.
After DC mV calibration is complete:
1. Turn the rotary switch to the temperature position. Put the Meter in calibration mode
by pressing the recessed button on the back of the Meter.
The secondary display, which normally shows the required input, displays zero. In
this case, no input is required.
2. Press the
UP button.
This sends the calculated temperature constants to EEPROM, and completes the
temperature calibration.
3. Continue calibrating the other functions, or turn the rotary switch to the
OFF
position to exit calibration.
Re-Programming Serial Number or Model Number
When the U10 EEPROM is replaced, you must also reenter the serial number and model
number for the 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
EEPROM. Enter the serial number from
the back of the Meter in the text box and click
OK. To enter the model number, click
Yes or No in the model menu box.