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Symptom
Unable to adjust output
Power mode operation has high
output current, but little or no
power measured
Output exceeds power limit
Open circuit error occurs during
calibration
Calibration is aborted
unintentionally
VOLTAGE LIMIT indicator blinks
Open circuit error E503 or voltage
limit error E505 prevents output
from reaching desired value
01_10
C A L I B R A T I O N A N D T R O U B L E S H O O T I N G
Corrective Actions
Check the I LIMIT parameter for the output range in use, see
that it is set above 0 A.
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 (2.5 V)
The "power limit" is not a hardware limit. It only serves as a
warning that the power measurement has exceeded the limit
setpoint. Normally this limit will cause the output to shut off. This
feature can be defeated via the LAS:ENABLE:OUTOFF
command.
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.
This indicates a voltage limit error; check laser connections. A
high impedance may cause this condition.
The LDX-32420 instruments have an adjustable laser
compliance voltage. Check to see if the LASER voltage limit
setting is too low (Chapter 2); check laser connections.
Troubleshooting Guide
6
C H A P T E R
83
LDX-32420
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Table of Contents
Troubleshooting
