Troubleshooting - Fluke 9116A User Manual

12

Troubleshooting

If problems arise while operating the 9116A, this section provides some sug-
gestions that may help you solve the problem.
12.1 Troubleshooting
Below are several situations that may arise followed by suggested actions to
take for fixing the problem.
Problem
The heater indicator LED
stays red but the tempera-
ture does not increase
The controller display
flashes "Cut-out" and the
heater does not operate
Causes and Solutions
The display does not show "cutout" nor displays an incorrect instrument
temperature, but the controller otherwise appears to operate normally.
The problem may be either insufficient heating or no heating at all.
One or more burned out heaters or blown heater fuses may also cause
this problem. If the heaters seem to be burned out, contact an Authorized
Service Center (see Section 1.4) for assistance.
The display flashes "Cut-out" alternately with the process temperature.
If the process temperature displayed seems grossly in error, consult the
following problem: 'The display flashes "Cut-out " and an incorrect pro-
cess temperature'.
Normally, the cutout disconnects power to the heater when the instrument
temperature exceeds the cutout set-point causing the temperature to drop
back down to a safe value. If the cutout mode is set to "AUTO", the heater
switches back on when the temperature drops. If the mode is set to "RE-
SET", the heater only comes on again when the temperature is reduced
and the cutout is manually reset by the operator, see Section 6.9 Cutout.
Check that the cutout set-point is adjusted to 10 or 20°C above the maxi-
mum instrument operating temperature and that the cutout mode is set as
desired.
If the cutout activates when the instrument temperature is well below the
cutout set-point or the cutout does not reset when the instrument temper-
ature drops and it is manually reset, then the cutout circuitry or the cutout
thermocouple sensor may be faulty or disconnected. Contact an Autho-
rized Service Center (see Section 1.4) for assistance.
12 Troubleshooting
Troubleshooting
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