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2
C H A P T E R
The Power On State
You can choose to "clear" the last saved state by recalling the default values.
These values are stored in BINS to that you can save or recall instrument
configurations (described in more detail in Chapter 5). "BIN 0" contains all of the
default configurations listed in Table 2.1.
Table 2.1 LDX-32420 Default Settings
GPIB mode in LOCAL via front panel, or in REMOTE via GPIB
PARAMETERS not selected
CAL PD = 0 µA / mW
LIM I (high range) = 10 A
LIM I (low range) = 5 A
LIM V = 4 volts
LIM P = 50W
Output off
DISPLAY enabled, in I mode
Constant I, low bandwidth mode selected
I setpoint = 0 mA
I
PD
P
RECALL BIN number = 0
Connecting to the Laser
When connecting your laser to the LDX-32420, we recommend that the
instrument be powered up with the output off. In this condition, a low impedance
shunt is active across the output terminals. When disconnecting devices, it is only
necessary to turn the current source output off.
It is also recommended that the connections from the LDX-32420 current source
output to the anode and cathode of the laser diode be made using stranded or
solid core wire. For best performance in any of the LDX-32420's operating modes,
we recommend the ILX CC-320 or CC-325 interconnect cables which connect
directly to the LDX-32420 current source output connector.
The laser current and photodiode 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 diode package and mount), the
12
LDX-32420
O P E R A T I O N
Connecting to the Laser
setpoint = 0 µA
setpoint = 0 mW
PD
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Table of Contents
Troubleshooting
