CALIBRATE DEVICE: TCS
AMP GA: 1
OS 1: 0.0006
GA 1: –0.257
CJ OS 1: –0.08
CJ OS 2: –0.11
CJ OS 3: –0.07
$
The second screen contains the parameters OS 2 through CJ OS 12 and also
CAL DATE.
CALIBRATE DEVICE: TCS
OS 2: –0.0004
GA 2: –0.241
CJ OS 7: –0.05
CJ OS 8: 0.02
CJ OS 9: –0.10
CJ OS 10: –0.08
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13.4.3
Calibration Procedure
Calibration is performed in two steps. The voltage measurement is calibrated
first and then the internal CJC. Calibration is performed on sets of three chan-
nels at a time. The equipment required are a copper shorting plug, a program-
mable voltage source, a precision voltmeter with an accuracy of 20 ppm or
better, a thermocouple (preferably type E) with a calibrated accuracy of
0.025°C or better from 0 to 30°C, and a temperature source between 0 and
30°C with an accuracy of 0.025°C. The AMP GA parameter is set at the factory
according to the type of amplifier installed and should never be changed. At
each step during the calibration procedure the readings should be allowed to
settle for at least five minutes before recording the measurement. Also, the
2566 should be allowed to warm up for one hour after power up prior to cali-
bration. The recommended procedure is as follows:
1.
Connect the copper short to Input 2 (or any of inputs 1 through 6) and
measure voltage. Adjust the OS 1 parameter by subtracting the measured
error. For example, if the
Black Stack
measures –0.0013 mV, adjust the
OS 1 parameter by adding 0.0013 to it. This adjusts the offset for chan-
nels 1 through 6.
2.
Connect the voltage source to Input 2, set it for 100 mV, and measure the
1560 Thermometer Readout
User’s Guide
160
