Ad590 Sensor Calibration - ILX Lightwave LDT-5500B Series User Manual

AD590 Sensor Calibration

The following procedure is for calibrating the AD590 sensor measurement so that
the temperature measurement will be accurate. This procedure calibrates the
current measurement of the AD590. This procedure does not calibrate C1 and C2.
For information on calibrating the AD590 sensor, see Appendix C.
Calibration may be aborted by pressing the OUTPUT switch.
05_11
M A I N T E N A N C E A N D T R O U B L E S H O O T I N G
a Set the SENSOR SELECT switch (back panel) to the AD590 position. Set C1 to 0.00,
C2 to 1.00.
b Connect a precision 20 k metal film resistor and a precision ammeter in series at
the sensor input of the LDT-5500B Series Temperature Controller. (pins 7 and 8)
c Enter the sensor calibration mode by pushing the display SELECT and parameter
SET buttons at the same time. After this, the TEC display will indicate sensor
reference current in A. Wait for three seconds for the measurement to settle.The k
enunciator is used to indicate sensor calibration.
d Press and hold in the ENABLE button and turn the ADJUST knob until the display
indicates the same current as shown on the precision ammeter.
e Release the ENABLE button and wait for the 7-segment display to flash off and then
back on. Replace the 20 k resistor with a 10 k metal film resistor. Wait for three
seconds and repeat Step d using the 10 k resistor.

Once the final sensor measurement is entered, the display will go blank. During this
step, the sensor temperature set point calibration is taking place internally. Allow the
instrument to self calibrate. Once completed, the calibration constants will be stored
to non-volatile memory, and the display will return to its previous state.
f After calibration, I LIMIT will be automatically set to 2.00 Amps. Reset the I LIMIT to
the desired value.
Calibration Adjustments
LDT-5500B Series
5
C H A P T E R
37
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