Chapter 3 Laser Diode Driver Operation 23
NOTE
The cable connections to the laser must be secure
to avoid an open circuit, should they be jostled or
bumped. Should an open circuit occur during laser
operations, the laser output will normally be
turned off automatically.
Special circuits in the laser driver are present for
detecting intermittent contacts and connections.
These circuits detect the abrupt change in current
that occurs when the output circuit is opened, and
the 5600 will generate an E-503 error.
Experience indicates that should an open circuit
occur during laser operation, the laser may be
damaged. Therefore, secure cabling is important.
NOTE
Although the intermittent contact circuitry works
well in helping to protect the laser diode, there is
still a danger in having poor connections, as no
circuit can protect completely.
NOTE
It is possible with some modes of modulation,
especially pulse or square-wave, to trigger the
intermittent contact circuit and cause a shutdown.
If this is the case for you, the intermittent contact
feature may be disabled in the laser set up menu,
with reduced laser protection in the case of poor
connections.
The output terminals of the unit are left floating relative to earth ground to
suppress AC power-on/power-off transients that may occur through an earth-
ground path. If the output circuit is earth-grounded at some point (such as
through the laser package and mount), the user must be careful to avoid
multiple earth grounds in the circuit. Multiple earth grounds may short out
the driver and may damage the laser.
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