I N S T A L L A T I O N A N D O P E R A T I O N
General Operating Procedures
3_03
LDX-3500 Series
21
C H A P T E R
2
General Operating Procedures
The following sections present some guidelines for operation, as well as some
common operating procedures.
Warm-Up and Environmental Considerations
Operate the LDX-3500 Series Precision Current Source at an ambient
temperature in the range of 0 to +40 °C. Storage temperatures should be in the
range of -40 to +70 °C. To achieve rated accuracy, let the LDX-3500 Series
Precision Current Source warm up for about 1 hour before use.
Current Mode Operation
You can operate the LASER current source portion of the LDX-3500 Series
Precision Current Source in several modes, constant I CW, constant I HBW, or
constant POWER. This example is for constant I CW or I HBW mode. Refer later
in this chapter for POWER mode operation.
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Plug the LDX-3500 Series Precision Current Source into an AC power source supplying the
correct voltage and frequency for your unit (refer to the back panel for the correct ratings).
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Turn on the LDX-3500 Series Precision Current Source. The OUTPUT stage will be off at
power-up and the unit will automatically configure its parameters to the state which existed
when the power was last shut off.
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Press the ENBL switch in the ADJUST section of the front panel so that the indicator is lit
(adjustment enabled). Press the MODE switch until the I CW or I HBW (high bandwidth)
mode is selected. Press the RANGE switch until the desired current range is selected.
•
Press the PARAMETER switch and check the setting of I LIMIT to insure that it is compatible
with the laser you are using. If not, turn the adjust knob until the current limit is correct.
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Press the DISPLAY switch and check the set point (operating) current. If it requires changing,
turn the adjust knob until the desired value is displayed.
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Turn the current output on by pressing the ON switch (in the OUTPUT section). The unit will
automatically drive the laser to the set point current.
In I CW or I HBW mode the output may also be modulated via the MODULATION input.
During operation, the adjust knob may be disabled by pressing the ADJUST ENBL switch.
The LED indicator will be unlit when the adjust knob is disabled.
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When the unit is powered off, the state of the unit at power-down is saved in non-volatile
memory.
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