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Output goes off intermittently
Unable to adjust output
Power Mode operation has high output current,
but little or no power is measured
Output exceeds Power Limit
Open Circuit Error occurs during calibration
Calibration is aborted unintentionally
CALIBRATING AND TROUBLESHOOTING THE 3916338 CURRENT SOURCE MODULE
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Check the interlock circuit. An intermittent interlock will
turn the output off.
Check that the AC power cord connection is secure.
Power-line drop-outs may reset the unit and when power
is restored, the output will be off.
Make sure that the ISET adjust parameter is highlighted.
Check the I LIMIT parameter; it should be set above the
laser operating current.
Check the VLIMIT parameter, the voltage limit should be
set above the voltage condition of your laser load.
Check the photodiode bias. If it is off, the circuit may act
as an open feedback loop. Set the bias to on (5V).
It is possible via GPIB to disable turning off the output
when the power limit is exceeded. Ensure that this is not
the case. Default at power-up is to enable this safety
feature.
The "Power Limit" is not a hardware limit. It only serves
as a warning that the power measurement has exceeded
the limit set point.
Check load connections. Check that measuring meter
does not auto-range (use non-auto-ranging modes).
Calibration modes will be aborted if an open circuit is
detected or if entered measurements are invalid.
PAGE 11
CHPT 5
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