Figure 2.6 Common Laser Anode - Photodiode Cathode; Figure 2.7 Common Laser Anode - Photodiode Anode - ILX Lightwave LDX-3500 Series User Manual

The cable connections to the laser must be secure enough that they won't open-circuit,
should they be jostled or bumped. Should an open circuit occur during laser operation,
the LASER output will be turned off (ON LED unlit) automatically.
Experience indicates that should an open circuit occur during laser operation (while the
LASER is on, the lasr may be damaged by a momentary circuit break-and-remake before
the final circuit break. Therefore, although the LDX-3500 Series Precision Current Source
provides a proprietary debounce protection circuit for LASER output, secure cabling is
important.
It is recommended that the connections to the LDX-3500 Series Precision Current
Source output be made using twisted wire pairs with an earth-grounded shield
(see Figures 2.4 - 2.7). The output terminals of the unit are left floating relative to
earth ground to suppress AC power-on/power-off transients that may occur
3_03
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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
OUTPUT
P. D. L. D.

Figure 2.6 Common Laser Anode - Photodiode Cathode

OUTPUT
P. D. L. D.

Figure 2.7 Common Laser Anode - Photodiode Anode

3500 Series Precision Current Source
7
+
Bias
6 +
-
8, 9
4, 5
3
E arth Ground
3500 Series Precision Current Source
7
+
Bias
6 +
-
8, 9
4, 5
3
Earth Ground
2
C H A P T E R
19
LDX-3500 Series