Fluke 7008 User Manual page 74

7008
Users Guide
The display flashes "cutout" and an incorrect
process temperature
13-2
temperature'.
•
Normally, the cutout disconnects power
to the heater when the bath 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 "RESET", the heater only comes
on again when the temperature is
reduced and the cutout is manually reset
by the operator, see Section 9.8, Cutout.
Check that the cutout set-point is
adjusted to 10 or 20 °C above the
maximum bath operating temperature
and that the cutout mode is set as
desired.
•
If the cutout activates when the bath
temperature is well below the cutout set-
point or the cutout does not reset when
the bath temperature drops and it is
manually re- set, then the cutout circuitry
or the cutout thermocouple sensor may
be faulty or disconnected. Contact an
Authorized Service Center (see Section
1.3) for assistance.
The problem may be that the controller's
voltmeter circuit is not functioning properly.
•
A problem could exist with the memory
back-up battery. If the battery voltage is
insufficient to maintain the memory, data
may become scrambled causing
problems. A nearby large static
discharge may also affect data in
memory. Verify that the parameters on
the Report of Test are accurate. Cycle
the power off, disconnect the bath from
AC, and then restart the bath.
•
The controller may need to be reset.
Perform the following Factory Reset
Sequence. Factory Reset Sequence.
Hold the SET and EXIT buttons down at
the same time while powering up the
instrument. The instrument display
shows '-init-', the model number, and the
firmware version. Each of the controller
parameters and calibration constants
must be reprogrammed. The values can
be found on the Report of Test that was
shipped with the instrument.
•
If initializing the memory does not
remedy the problem, there may be a
failed electronic component. Contact an
Authorized Service Center (see Section