ILX Lightwave LDT-5525 User Manual page 41

II. 100 uA Sensor Calibration.
1_______ Set C1 to 0.99, C2 to 2.57.
2_______ Set the sensor select switch to "100 uA" (-01-).
3_______ Connect the output of the LDT-5525 to the 5525 Sensor Test Fixture. Set the fixture for SENSOR 1,
2
Load 1 .
4_______ Hold down both the "MODE" and "SENSOR CAL" buttons. This will put the 5525 into "Sensor Cal"
3
mode.
5_______ Allow the sensor measurement circuit to settle, usually about 3 seconds.
6_______ Hold down the "ENBL" button and turn the knob until the display reads the value of the calibrated
resistor, in kΩ (4.00).
7_______ Release the "ENBL" button and wait for the "VIEW SET" light to go out.
8_______ Set the 5525 SENSOR Test Fixture "Load" switch to position 2
9_______ Allow the sensor measurement circuit to settle.
10______ Hold down the "ENBL" button and dial in the known sensor resistance (40.08).
11______ Release the "ENBL" button.
12______ Wait for the automatic set point cal procedure to complete - about 10 seconds.
13______ Set the 5525 Sensor Test Fixture "Load" switch to the "Chk" position. Verify the resistance reading is
20.07 plus or minus 0.05.
14______ Connect a voltmeter to the Analog Output BNC connector of the 5525 and measure the DC volts.
Verify the voltage reading is 2.007 volts plus or minus 0.5 volts.
2
Be sure you are properly grounded whenever you make contact with the rear connector.
3
Calibration can be terminated at any time by pressing the "OUTPUT" button. This will stop cal; no cal constants
will be stored to the EEPROM.
4
It doesn't matter which value resistor is used first.
4
.
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