- ILX Lightwave Corporation User's Guide High Compliance Current Source LDX-3232

FUNCTIONS AND FEATURES
Saving and Recalling Under Remote Operation
84 LDX-3232
CHAPTER 5
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To recall a previously saved instrument setup, press the SELECT switch until the
RECALL indicator led becomes lit. The instrument will display a RECALL "bin"
number on the display. If you desire to change the RECALL bin, press and hold
the SET switch and rotate the adjust knob until the desired bin number is
displayed. Releasing the SET switch completes the RECALL operation. The
instrument is restarted and the front panel parameters are reconfigured to the new
parameters saved under that bin number.
The factory default values for front panel parameters may be restored by recalling
"bin" zero (0). See Table 2.1 for the default settings.
Saving and Recalling Under Remote Operation
For saving under remote operation, use the command *SAV x, where x is the
desired "bin" number (1-10). For a recall under remote operation, use the
command
*RCL x, where x is the desired "bin" number (0 - 10).
Using the Laser Compliance Voltage Adjustment
For applications where you need to have critical protection of the laser, we
recommend the following. Using a 1
Ω resistor or other non-critical load, set the
LASER voltage limit as described in Chapter 2.
Then with the LASER output on, slowly increase the LASER current and watch
the LASER voltage measurement. Press the (DISPLAY) SELECT push button to
see the voltage. At about 0.25 V below the LASER voltage limit value, the
VOLTAGE LIMIT warning indicator will become lit on the display. Continue to
adjust the current upwards until the voltage limit is reached and the output is shut
off. Record the voltage at that the LASER output shuts off. It should be within the
specification of the LASER voltage limit accuracy. However, there is typically
some offset error. For example, if the LASER voltage limit is set to 5.0 V, the
actual voltage where it shuts off may be 4.9 V. This error term of 0.1 V should be
considered when setting the LASER compliance voltage limit.
The closer the LASER voltage limit shut off point is to the operating voltage of
your laser, the faster the circuit will work in the event of an open circuit. Some
experimentation may be necessary for optimum results.