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5-2
Section V
–
Maintenance and Servicing
Calibration Environment
Calibration and verification should be performed in laboratory operating conditions as
stated in Section I; Table 1.1. Allow 1830A to warm up for at least one hour before
calibration.
Disassembly of 1830A
There is no disassembly required for calibration of the 1830A. The 1830A should remain
fully assembled during the calibration process.
Calibration and Diagnostic Process
Both the calibration and diagnostic performs the same process on both channels. However; the
calibration is more automated and controlled then the diagnostic. Table 5.1 Lists all of the
calibration/diagnostic procedures.
Calibration Process
Process Definition
Zero the Servo Loop
This operation is done to eliminate any difference
between the voltages across the bolometer and
reference resistor when the loop is balanced.
Calibrate the ADC for
Reading BV and RV
This operation is done to determine any gain or
offset values in the bolometer and reference
resistor voltages.
Calibrate the Auto-Zero DAC This operation is done to determine any gain or
offset values in the offset DAC voltage.
Calibrate the ADC for
reading DAC-RV at high gain
This operation is done to determine any gain or
offset values in the DAC-RV reading of the ADC, at
high gain.
Calibrate the ADC for
reading DAC-RV at low gain
This operation is done to determine any gain or
offset values in the DAC-RV reading of the ADC, at
low gain.
Calibrate 100-Ohm
Reference Resistor
This operation is done to measure the actual
resistance value of the analog channel 100 Ohm
resistor.
Calibrate 200-Ohm
Reference Resistor
This operation is done to measure the actual
resistance value of the analog channel 200 Ohm
resistor.
Calibrate the Gain Adjust
Channel
This operation is done to measure the slope and
offset values for the custom resistance setting.
Table 5.1 - Calibration Process
