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To set the Constant Power limit, use the SELECT push button in the PARAMETER section to select LIM P. When
the LIM P is indicated by the accompanying LED, the display will indicate the limit set point in mW. Press and hold
the (PARAMETER) SET push button and rotate the adjust knob to set the limit to 1.50 mW. When the desired value
is reached, release the (PARAMETER) SET push button to store the new limit value.
The LIM P is the absolute limit of optical power, as detected by the unit via the monitor PD feedback loop. In order
for this limit to be meaningful, the monitor photodiode responsivity (CAL PD) must be adjusted correctly. This limit
is a software limit only. The LASER output is normally turned off if this limit is reached (See LASer:ENABle:OUTOFF
command in Chapter 4 for instructions on disabling this function). The maximum LIM P value is 100.0 mW (LDX-
3210), and 500.0 mW (LDX-3220).
Also, in constant power mode the LASER current limit and voltage limit values are in effect. Refer to the discussion
on page 8 that describes how to set these limits.
Now the instrument is configured to operate in Constant Power Mode. In the MODE section,
enable the output of the laser current source by depressing the OUTPUT push button once.
The accompanying led labeled ON will illuminate indicating that the laser output is on and
current is being driven to the laser. The LDX-3200 current source will drive the laser to the
Constant Power set point and maintain closed loop control with the PD current measurement.
ERROR INDICATORS
The LDX-3200 Series Precision Current Sources indicate general operational error conditions. Each error condition
results in an action as shown in the following table.
Error Condition
Interlock
Open circuit
Current limit
Voltage limit
Optical Output Power Limit
HOW TO OPERATE YOUR LDX-3200
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ERROR INDICATORS
Action
Output off, INTERLOCK light flashes at 1 Hz
Output off, OPEN CIRCUIT light flashes at 1 Hz.
If this condition was caused by an excessively high
compliance voltage, the VOLTAGE LIMIT light will also
be turned on.
CURRENT LIMIT light flashes at 1 Hz
VOLTAGE LIMIT light flashes at 1 Hz. This indicator warns that the
output is within 0.25 volts of LIM V setting. If the voltage limit (LIM
V) is reached, the LASER output will shut off.
Output off, POWER LIMIT light flashes at 1 Hz
Table 2.2 LDX-3200 Error Indicators
PAGE
8
CHPT 2
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