O P E R A T I O N
Installation
01_04
LDX-3412
7
C H A P T E R
2
Output Connectors
Output current is available from the 9-pin D-sub connector (J105). Pins 4 and 5
are the negative output, and pins 8 and 9 are the positive output current
connections. These pins are jumpered to provide greater contact area for the
output connections. This is done to reduce the risk of an open output connection
due to a loose connector. Thus, the output is made safer for laser diodes.
Note: Whenever external connections are made to the output at pins 4 and 5 and 8 and 9.
These connector leads must be jumpered as shown above to ensure the greatest laser
diode safety.
Chassis GND Connector
The output current terminals are floating with respect to chassis ground. A chassis
ground GND connector (bare metal) is available for the user's convenience. See
Section 2.5.4, Laser Diode Connections and Shielding.
Photodiode Feedback (PD) GAIN Adjustment
Photodiode feedback gain may be adjusted by the user via the COARSE and
FINE controls on the rear panel of the LDX-3412. When the CONST P mode is
selected, the user may adjust the feedback gain for proper testing of a laser diode.
Turning the COARSE and FINE controls counter-clockwise (CCW) will increase
the feedback gain and decrease the output current. See Figure 2.4 for setting the
photodiode feedback gain.
Warm-up and Environmental Considerations
The LDX-3412 should be operated at an ambient temperature between 0 and
50
o
C. Storage temperatures should be in the range of -40
o
C to 70
o
C. In order to
achieve rated accuracy, the LDX-3412 should be warmed up for 1 hour before
use.
Note: To prevent overheating, the LDX-3412 must be kept well ventilated. Allow at least
1/2 inch clearance around the vent holes.
Operating Instructions
The following sections contain instructions on the set-up and operation of the
LDX-3412. Section 2.5.6 contains the step-by-step operating procedures. For
calibration, see Section 4.2.
Connecting to Your Device
When connecting laser diodes and other sensitive devices to the LDX-3412, we
recommend that the LDX-3412 be powered up and the OUTPUT be off (LED
unlit). In this condition a low impedance shunt is active across the output
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