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Troubleshooting and Service
The display is in the form, off Blk NNNN.NN ohm, where off
indicates that a target temperature has not yet been selected, Blk
indicates that the block probe channel is being tested, NNNN.NN is
a numeric read-out of the probe, and ohm indicates the units of the
readout. These readings are updated continuously.
2. Pressing the < key sequentially changes the target cooling well
block temperature from off to +1, to -8, in steps of -1°C to off, etc.
3. Pressing the > key sequentially changes the channel and readout
units from block probe resistance in ohms, to sample probe
resistance in ohms, to block temperature in tenths of a degree
Celsius, to sample temperature in tenths of a degree Celsius, to
cooling block duty cycle (NN % on), to block resistance in ohms,
etc.
CAUTION The temperature values displayed are based on the block
probe resistance which the instrument is configured for.
Thus, if the block probe bin number has been incorrectly
set, both the displayed temperatures and resistances will
be incorrect, as well as the actual temperature of the
sample cooling well.
While the target temperature is off, the block probe is warm and its
resistance should be less than 4,990 ohms. As the temperature is
set colder, the resistance will increase.
4. Press STOP to raise the operating head and exit to the test menu.
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