Troubleshooting - Fluke 5606 User Manual

8 Troubleshooting

8.1 Troubleshooting
In the event that the probe appears to function abnormally, this section may be of use
in solving the problem. Several possible problem conditions are described along with
likely causes and solutions. If a problem arises, please read this section carefully and
attempt to understand and solve the problem. If the probe seems faulty or the problem
cannot otherwise be solved, contact an Authorized Service Center (see Section 1.3,
Authorized Service Centers, on page 2) for assistance. Be sure to have the model num-
ber and serial number of your probe available.
Problem
Data changes greater than 0.1°C
are observed
Data unstable
Temperature readout different
than expected, e.g. the heat
source is set at 300°C, the PRT
measures 275°C.
Causes and Solutions
Mechanical shock can cause temperature errors as great as 0.5°C.
If this is observed, recalibrate the PRT.
If the data is unstable at the Triple Point of Water (TPW), check
the connector. If the connector is correct, contact an Authorized
Service Center (see Section 1.3, Authorized Service Centers, on
page 2). The PRT may be damaged and need repair.
If the data is unstable at high temperatures, it may be due to
electrical noise in the system. Reduce the temperature and
observe the data. If it is stable, electrical noise is interfering with
the measurements at high temperatures. Check the grounding of
the readout device and the heat source. A faulty ground on either
device could interfere with high temperature measurements. A
ground wire attached to the metal sheath of the PRT may help to
reduce electrical noise interference.
Measure the PRT resistance at TPW.
If the resistance of the PRT is less than the rated resistance, e.g.
70W for the 5606/5607, there may be a short in the sensor. Contact
an Authorized Service Center (see Section 1.3, Authorized Service
Centers, on page 2).
If the resistance of the PRT is only a few ohms, there may be a
short in the four lead-wires. Contact an Authorized Service Center
(see Section 1.3, Authorized Service Centers, on page 2).
If the PRT is open, the resistance will be "Out of Limits" or in the
kilohm or megohm range. Contact an Authorized Service Center
(see Section 1.3, Authorized Service Centers, on page 2).
Troubleshooting
Troubleshooting
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