Remote Thermistor Calibration - ILX Lightwave LDT-5500B Series User Manual

5
C H A P T E R

Remote Thermistor Calibration

36
 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 100
0.99, C2 to 2.57, and C3 to 0.855.
b Measure and record the exact resistance of your 4 k, 40 k, and 400 k metal film
resistors. A 4-point probe resistance measurement is recommended.
c Connect the 4 k(for 100
input of the LDT-5500B Series Temperature Controller (pins 7 and 8).
d Enter the sensor calibration mode by sending the command "TEC:CAL:SEN". After
this, the display will indicate the sensor resistance in k. Allow the measurement to
settle for about three seconds.
e Send the command "TEC:R VALUE", where VALUE indicates the resistance in K
measured in Step b for the 4 k resistor.
f Wait for the 7-segment display to flash off and then back on. Replace the 4 k
resistor with the 40 k metal film resistor (for 100 A) or 400 k metal film resistor
(for 10 A). After three seconds, repeat Step e with this 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.
g Switch the SENSOR SELECT switch to the 10
h After calibration, the I LIMIT will be automatically set to 2.00 Amps. Reset the I LIMIT
to the desired value.
 
A) or 40k (for 10 A) metal film resistor to the sensor

A position and repeat Steps c - f.

A position. Set C1 to