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

5
C H A P T E R

Remote AD590 Sensor Calibration

38
 LDT-5500B Series
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
Calibration Adjustments
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 sending the command "TEC:CAL:SEN". After
this, the TEC display will indicate sensor reference current in A. Wait for three
seconds for the measurement to settle.
Send the command "TEC:R VALUE", where VALUE indicates in A, the current
d
measured by the precision ammeter.
e 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, then 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.