OPERATIONS
Connecting to the Laser Controller
7/01 LDC-3700 Series 11
CHAPTER 2
Connecting to the Laser Controller
When connecting your laser diode or any other sensitive devices to the LDC−3700B Series Laser
Diode Controller, ILX recommends that the instrument be powered up and the LASER output be off
(LASER MODE) ON LED unlit. In this condition, a low impedance shunt is active across the output
terminals. When disconnecting devices, it is only necessary to turn the LASER Output off.
ILX also recommends that the connections to the LDC−3700B Series Laser Diode Controller output
be made using twisted wire pairs with an earth−grounded shield (see Figure 2.1 on page 12). The
output terminals of the instrument 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 provide circuit paths that
induce spurious currents in the photodiode feedback circuit and output leads.
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