Fluke 6050H User Manual page 64

6050H
User's Guide
The display flashes "CUToUT" alternately
with an incorrect process temperature
The controller displays the wrong
temperature and the bath continually heats
or cools regardless of the set-point value
56
Problem Causes and Solutions
20°C above the desired maximum bath operating
temperature and that the cutout mode is set as
desired.
Continuous cutout. 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 reset, the cutout circuitry may
be faulty. Try performing the Factory Reset Sequence
explained below.
Factory Reset Sequence Hold the "SET" and "EXIT"
keys down at the same time while powering up the
unit. The display shows "-init", the model number, and
the firmware version. Each of the controller
parameters and calibration constants must be re-
programmed. The values can be found on the Report
of Calibration that was shipped with the instrument.
Low battery. 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. Access the battery by
removing the L-shaped panel covering the display
electronics.
Corrupt controller memory. If the problem reoccurs
after the battery is replaced, initialize the memory by
performing a Factory Reset Sequence (described in a
previous solution).
Defective control probe. The bath control probe may
be disconnected, burned out, or shorted. Check first
that the probe is connected properly to the socket in
the rear of the bath labeled "PROBE".
The probe may be checked with an ohmmeter to see
if it is open or shorted. The probe is a platinum 4-wire
Din 43760 type. The resistance should read 0.2 to 2.0
ohms between pins 1 and 2 on the probe connector
and 0.2 to 2.0 ohms between pins 3 and 4. The
resistance should read from 100 to 300 ohms
between pins 1 and 4 depending on its current
temperature.
Corrupt controller memory. Initialize the memory by
performing a Factory Reset Sequence (described in a
previous solution).