Newport 500B Series, User Manual, Page: 28 / 64

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4 System Operation
WARNING
Before operating the Model 500B Series Laser Diode Drivers,
please read and understand all of Section 1.
4.1 Front Panel
The front panel of the Model 500B Series Laser Diode Driver is arranged for
easy operation. Seven distinct areas, each with a specific set of related
functions, and a control knob are located on the front panel, as shown in
Figure 12 below.
Figure 12 Front Panel Layout (501B shown)
4.1.1 AC Power Switch
When AC power is turned on the unit starts up in a default configuration with
the OUTPUT off and the display in the SETPOINT mode. The power switch
is located in the lower left corner of the instrument front panel.
4.1.2 MOD
Modulation of the laser diode by an external signal source through the MOD
input BNC only available in the CURRENT mode. The output current level
to the laser diode can be set using external voltage source or it can be
modulated with a function generator signal. Any input modulation signal is
added to the DC drive current level set by the front panel control knob. The