Troubleshooting - Fluke 1529 Chub-E4 User Manual

11
11.1
Problem
Incorrect temperature reading

Troubleshooting

In case you run into difficulty while operating the 1529 system, this section
provides some suggestions that may help you solve the problem. Below are
several situations that may arise followed by possible causes and suggested ac-
tions you might take.
Troubleshooting
The following table lists possible error messages, their causes, and suggested
actions.
Solution
While attempting to measure temperature, the display shows an incorrect value or no value at all
( . . . . . . . . . ).
•
If the temperature readings seem to be incorrect you should first check to see if the
resistance, or voltage in the case of thermocouples, is being measured correctly.
Set up the display to show the resistance or voltage for the channel.
•
If the resistance or voltage is incorrect refer to the next subsection for troubleshoot-
ing incorrect resistance or voltage readings.
•
If the resistance or voltage is being measured correctly but the displayed tempera-
ture value is incorrect consider the following possibilities:
One or more coefficients are incorrect. This is a common mistake. While entering coefficients
it is easy to miss a digit or sign. Check all the values carefully using the EDIT PROBE function
(see Section 7.2.1) comparing them with the values on the calibration certificate for the probe.
Use the TEST PROBE function to test the coefficients (see Section 7.2.1.10, Standard Thermo-
couple Conversions).
The selected conversion type is incorrect. Check to make sure the correct conversion type is
selected. In the case of thermocouples, make sure you have selected the correct type. You
should also make sure that you have selected the proper reference junction compensation (RJC)
made for your application (see Section 7.2.1.10, Standard Thermocouple Conversions). You
can use the TEST PROBE function to test the temperature conversion calculation.
The measurement is out of range. The 1529 may not be able to calculate temperature accu-
rately if the resistance or voltage is outside the valid range. The measured resistance or voltage
may be too low or too high if the actual temperature is too low or too high or if there is a problem
with the sensor.
•
The measure period may be set to a long interval. Check the measure period set-
ting.
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Troubleshooting
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