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1529 Chub-E4 Thermometer Readout
Troubleshooting
Problem
Incorrect resistance or voltage
reading
Blank screen
Error message at power up
Temperature not
updating
10.1.1
Self-Test Error Messages
The following messages may appear during the self-test. If the recommended action
fails to correct the error, contact an Authorized Service Center (see Section 1.3, Autho-
rized Service Centers on page 4) for assistance.
Message
SYSTEMS: INVALID TIME
SYSTEMS: SERIAL PORT FAILURE
126
Solution
While attempting to measure resistance or voltage, the display shows an incorrect value or no
value at all
(. . . . . . . . . . ).
Consider the following possibilities:
Poor or incorrect connection of the probe. A common mistake is to connect the wires of the
probe to the wrong terminals. Check the wiring carefully, especially when using a four-wire PRT
(see Section ). Make sure the lead wires are fastened down tightly.
Open, shorted, or damaged sensor or lead wires. In the case of resistance sensors check
the resistance across the sensor using a hand-held DMM. Also check the resistance between
common pairs of leads. Check to make sure there is no conductivity between any of the leads
and the probe sheath. Use a good-quality sensor to avoid errors caused by drift, hysteresis, or
insulation leakage. In the case of thermocouples, use a hand-held DMM to check its voltage.
Improper setting for three or four-wire probe. Make sure the correct wiring type is selected
Selecting three-wire input while using four-wire probes may cause errors of 0.01 to 0.1 ohms.
Selecting four-wire input while using three-wire probes will result in erratic or out-of-range
readings (see Section 5.4.1, Connecting a PRT or Thermistor Probe on page 18).
Electrical interference. Intense radio-frequency radiation near the 1529 or probes can induce
noise into the measurement circuits resulting in erratic readings. The 1529 is intended to operate
in a laboratory environment with limited radio-frequency noise. If interference seems to be a
problem you might try eliminating the source of interference or moving the 1529 to a different
location. A well-grounded, shielded cable should be used for the probe leads.
Stem conduction error. The problem may be that the actual temperature of the sensor is not
what you expect. This is often the result of stem conduction where heat flowing through the stem
of the probe to ambient affects the temperature of the probe. It is very important that probes be
inserted to an adequate depth into the material being measured. Measuring temperature using a
surface sensor can be especially difficult as the sensor is directly exposed to ambient.
Wrong calibration parameters. The problem may be that the calibration parameters for the 1529
are invalid. Check the parameters currently stored in the unit against those listed on the 1529
Report of Calibration.
The screen lights up when the 1529 is switched on but the screen appears blank. This
problem can be caused by improper adjustment of the contrast. After the power is switched on
allow the 1529 at least one minute to complete its self-test and power on sequence. Then, try to
adjust the contrast using the contrast buttons.
The 1529 reports an error during the power up self-test. On power up the 1529 performs a
series of self-tests to check the operation of all its components and each of the modules. The
results of the self-tests are reported on the screen. Normally, all tests report 'OK'. Below is a
table of error messages and recommended actions to correct the error. Often these errors can
be corrected by completing the actions listed. A failure of one or more component causes error
messages to be reported. Component failures generally require a qualified factory technician to
replace the faulty component. Contact an Authorized Service Center (see Section 1.3, Authorized
Service Centers on page 4).
The 1529 measure period may be set to a long interval. Check the measure period.
Recommended Action
Set the date and time.
Cycle the power.
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