Remote Ite Current Calibration - ILX Lightwave LDT-5500B Series User Manual

5
C H A P T E R

Remote ITE Current Calibration

42
 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 For the LDT-5525B, connect a 1, 20W resistor across the TEC output terminals
(pins 1 and 3). For the LDT-5545B, connect a 1.5, 50W resistor. Use a calibrated
DMM to measure the voltage across the resistor. Calculate the current in the
following steps by using Ohm's Law: 

I = E / R

-where E is the accurately measured voltage across the resistor, and R is the
accurately measured load resistance. A 4-point probe resistance measurement is
recommended.
b Enter into remote ITE current calibration mode by sending the command
"TEC:CAL:ITE". After this, the TEC display will indicate ITE current in Amps.
c Remotely send the current value measured and calculated using Step a using the
command TEC:ITE - VALUE.
d Wait three seconds to allow the ITE current to settle at the new set point.
e Repeat Steps c and d for all six set points; once for each of the (automatically set) set
points. For the LDT-5525B, the set pints are 3A, -3A, 3A, 1A, -1A and -3A. For the
LDT-5545B, the set points are 4A, -4A, 4A, 1A, -1A and -4A.

After the last set point is entered, the LDT-5500B Series Temperature Controller's
front panel will go blank while the instrument calibrates the ITE set point and current
limits. Allow the instrument to self-calibrate. Once completed, the calibration
constants will be stored in non-volatile memroy, and the display will return to its
previous state.
f After calibration, the I LIMIT will be automatically set to 2.00 Amps. Reset the I LIMIT
to the desired state.