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Problem
The controller erratically heats then
cools, control is unstable
The Bath does not achieve low
temperatures
Table 6. Troubleshooting (cont.)
If both the Bath temperature and output power do not
vary periodically but in a very erratic manner, the
problem can be excess noise in the system. Noise due
to the control sensor should be <0.001 °C. However, if
the probe is damaged or has developed an intermittent
short, erratic behavior can exist. The probe is located
inside the stirrer motor cover.
•
Make sure for a damaged probe or poor connection
between the probe and Bath.
•
Make sure the resistance between the probe pins
and the sheath is open.
•
Intermittent shorts in the heater or controller
electronic circuitry can also be a possible cause.
Contact Fluke Calibration.
Too much heating or not enough cooling can cause this
problem.
Check that the control indicator glows green which
shows that the controller is attempting to cool. The
heaters can be disabled as a test by temporarily
removing the heater fuses. Insufficient cooling can be
caused by lack of refrigerant in the system. Contact
Fluke Calibration.
Causes and Solutions
Calibration Bath
Troubleshooting
57
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