Hitachi CHROMASTER 5160 Instruction Manual page 692

4.1.6 How to Check the Temperature Control Accuracy
Check the accuracy (stability) of temperature control at the set
temperature in the following procedure.
(1) Set the thermocouple in place the same way as in steps (1)
to (3) of the preceding section for checking the temperature
setting accuracy, and connect the thermometer output to a
recorder.
(2) Set the column oven parameters as follows.
Temperature setting : 40 °C
Tolerance range
Wait time
(3) Once the READY LED comes on, output the oven
temperature to the recorder for 10 minutes.
Specification: Variation width of oven temperature over
10 minutes should be within 0.2 °C (max. - min.
value).
4 - 7
: 1.0 °C
: 20 min
4.1.5