I N S T A L L A T I O N A N D O P E R A T I O N
Introduction to the LDX-3500 Series Front Panel
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LDX-3500 Series
C H A P T E R
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power, and the display switch will toggle between laser power measurement, laser
power set point, and output current measurement.
When any control mode measurement is displayed, pressing the display switch
once will toggle to the specific control mode set point. If the display switch is not
pressed again within three seconds, the display will automatically return to the
control mode measurement. Likewise, when the output is off and a measurement
is displayed, if the adjust knob is turned the control mode set point will be
displayed for three seconds. If the set point is adjusted (by turning the adjust
knob) the set point timer will be restarted. Therefore, three seconds after the set
point is adjusted the display will return to the last measurement.
Parameters
The 3500 Series Precision Current Source allows adjustment of the following
parameters, I LIMIT (output current limit), P LIMIT (laser power limit) and CAL PD
(monitor photodiode responsivity).
When the I LIMIT is set, the hardware will limit the output current to the I LIMIT
value, regardless of the set point or control mode.
When the P LIMIT is set and the user is in POWER mode, the P LIMIT will NOT
limit the output current. If the power limit is reached in power mode, the P LIMIT
indicator will blink as a warning.
The CAL PD parameter is used to convert monitor diode (back facet) current
measurements to light power. The range of this parameter is 0.001 to 1.000
mA/mW. Setting CAL PD to 1.000 allows the user to measure the monitor diode
current directly in mA.
Parameter Setup
The PARAMETER switch is used to view and edit the parameters. Repeatedly
pressing the PARAMETER switch will cycle through the parameters.
When a parameter is selected for viewing, its value will remain on the display for
three seconds. If an adjustment is made to the parameter (by turning the adjust
knob) the three second timer will be restarted. Three seconds after the parameter
adjustment is done, the display will revert to the last measurement mode.
Current Output
The OUTPUT section contains the ON switch and indicator. The ON indicator is lit
whenever the output is on. Pressing the ON switch will toggle the current output
on or off.
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