User's Manual

LDT-5100 9
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CHAPTER 3
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CALIBRATION
Thermistor Current Source Calibration
To calibrate the thermistor current source, connect an ammeter in series with a 10
kΩ resistor at the output connector (J1).
1 Place the thermistor current jumper (J5) in the 100 µA position.
2 Adjust trim pot R51 to read 100.00 µA on the current meter.
3 Place the thermistor current jumper (J5) in the 10 µA position.
4 Adjust trim pot R50 to read 10.00 µA on the current meter.
TE Current Limit Calibration
To calibrate the ITE limit current, connect a fixed known load
(approximately 1.0 Ω / 25 Watt) at the TE output.
1 Set the current limit jumper to the 1 Amp position.
2 Set the resistor select jumper in the internal position.
3 Adjust trim pot R52 so that a negative I
TE
current is produced.
4 Measure the voltage developed across the load with a voltmeter.
5 Adjust trim pot R5 so that the output current is 1.00 Amps.