ILX Lightwave LDT-5525 User Manual page 34

Calibration may be aborted by pressing the OUTPUT switch.
a. Set the SENSOR SELECT switch (back panel) to the 100 µA position. Set C1 to 0.99, C2 to 2.57.
b. Measure and record the exact resistance of your 4 KΩ, 40 KΩ, and 400 KΩ metal film resistors. A 4-point
probe resistance measurement is recommended.
c. Connect the 4 KΩ metal film resistor to the sensor input of the LDT-5525 Temperature Controller (pins 7 and
8).
d. Enter the sensor calibration mode by pushing the MODE and SENSOR CAL switches at the same time. After
this, the display will indicate the sensor resistance in KΩ. Allow the measurement to settle for about three
seconds.
e. Press and hold in the ENBL switch and turn the ADJUST knob until the display indicates the same
resistance you recorded for the 4 KΩ metal film resistor.
f. Release the ENBL switch and wait for the VIEW SET indicator (LED) to be unlit. Replace the 4 KΩ resistor
with the 40 KΩ metal film resistor (for 100 µA) or 400 KΩ metal film resistor (for 10µA). After three seconds,
repeat Step e with this resistor. Ten seconds after the ENBL switch is released, the LDT-5525 Temperature
Controller will store the calibration data in non-volatile memory.
Press the DISPLAY switch three times to rotate the display back to the SENSOR mode.
g. Switch the SENSOR SELECT switch to the 10 µA position and repeat Steps c - f.
h. After calibration, the I LIMIT will be automatically set to 4.00 Amps. Reset the I LIMIT to the desired value.
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