30
LDX-3500 Series
A P P E N D I X
A
Output goes off intermittently
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.
Power Mode operation has high
output current, but little or no power
is measured
Check back panel PD BIAS; if set too low, may act as an open
feedback loop; if in doubt, set the PD BIAS to mid range
Output exceeds power limit
The “power limit” is not a hardware limit; it only serves as a
warning that the power measurement has exceeded the limit
set point
Power Limit Indicator does not work
in CW or IHBW modes
Power limit is not detected in the constant current modes
Open Circuit Error occurs during
calibration
Check load connections; check that meter does not auto-range
(use non-auto-ranging modes)
Calibration is aborted
unintentionally
Calibration modes will be aborted if an open circuit is detected
OPEN/V LIM indicator blinks
This indicates a voltage limit error; check laser connections; a
higher impedance may cause this condition
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