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6
C H A P T E R
Recommended Equipment
Recommended test equipment for calibrating the LDX-32420 Current Source is
listed in Table 6.1. Equipment other than that shown in the table may be used if
the specifications meet or exceed those listed.
Table 6.1 Recommended Test Equipment
Description
DMM
Current Transducer
DC Power Supply
The DC power supply is necessary to power the current transducer. The current
transducer is used to reduce the current down to acceptable measurement ranges
for the DMM. For most of the tests, the Laser Anode and Cathode connections are
looped through the IT 150-S twice to increase the measurement sensitivity. In this
configuration, the current from the transducer is 1/375
LDX-32420.
Calibration of the LDX-32420 Current Source
There are three calibration adjustments required for the current source. They are
calibration of the constant current source for both bandwidths and ranges,
calibration of the laser voltage measurement, and calibration of the constant light
power (I
The LDX-32420 Current Source implements a two-point calibration for the Laser
current source. Two current levels (approximately 80% and 20% of FS) are
applied to a test load, and the resulting current measurements are fed back (by
the user) to the Current Source. The Laser Current Source calibration program
uses the two sets of data to calculate new calibration constants. These calibration
constants are used to set the actual current output of the current source.
74
LDX-32420
C A L I B R A T I O N A N D T R O U B L E S H O O T I N G
Recommended Equipment
) feedback circuits.
PD
Manufacturer/Model
Agilent 3458A
LEM IT 150-S
Agilent E3631
Specification
DC Amps 0.5 A @ 5 mA
DC Volts 500 V @ 5V
Accuracy 0.0043%
+15 V, 250 mA
th
the current from the
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Troubleshooting
