ILX Lightwave LDC-3700C Series, User Manual, Page: 172 / 176

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
Troubleshooting
156
LDC-3700C Series
C H A P T E R
5

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.
Open Circuit Error occurs during
calibration Check load connections. Check that measuring
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.
VOLTAGE LIMIT indicator blinks This indicates a voltage limit error. Check laser
connections. A high impedance may cause this
condition.
Open circuit error E503 or Voltage Limit
error E505 prevents output from reaching
desired value. The LDC-3700C Series instruments have an
adjustable laser compliance voltage. Check to see if
the LASER voltage limit setting is too low (see
Chapter 2). Check laser connections.
TE Controller
Power on, but no TE current output If TE MODULE OPEN indicator is lit, check the load
connections.
Check that pins 14 and 15 of the output connector
are not connected. See Boosting the TE Controller
on page 41.
Power on, but temperature is not controlled If SENSOR OPEN indicator is lit, check the sensor
connections.
Check that the rear panel SENSOR SWITCH
position is set for the proper sensor type.
Check that C1 and C2 and C3 are correct values for
your temperature sensor.
Check that the GAIN setting is not too low and that
the LIM I
TE
value is not too low for your thermal
load.
Unable to adjust output or parameter Check the (ADJUST)TEC indicator, the indicator
must be lit for any TEC adjustments to be made.
Check the MODE or DISPLAY indicators. If they do
not respond to a switch, the unit may be in
measurement calibration mode. Cycle the power
switch to abort this mode.
Output goes off intermittently 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.
Check the TE module connections. A high
impedance on the TE load may cause the output to
exceed the compliance voltage momentarily, thus
shutting the output off.
Table 5.3 Symptoms and Actions
Symptom Corrective Actions