Recommended Equipment; Figure 5.1 Ipd Calibration Circuit; Table 5.2 Recommended Test Equipment; Table 5.3 Required Photodiode Current Source Calibration - ILX Lightwave LDC-3926339 User Manual

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
5
C H A P T E R
Calibration
The LDC-3926339 must be calibrated while installed in a mainframe. Calibrate the
module every 12 months or whenever performance verification indicates that
calibration is necessary, such as differences between set point and measurement
display values which exceed the accuracy specification. Calibrate the modules
under laboratory conditions; typically, 23.0 °C (±3.0 °C). If possible, calibrate the
LDC-3926339 at its intended use temperature if this is within the specified
operating temperature range of 0-40 °C.
Note: Turn on and warm-up the LDC-3926339 for at least one hour before calibration.

Recommended Equipment

The recommended test equipment specifications for calibrating the module are
shown in Table 5.2. Equipment other than that shown in the table can be used if
the specifications meet or exceed those listed.

Table 5.2 Recommended Test Equipment

DMM
You must connect various loads and circuits to the outputs of the module for the
calibration procedure. The devices required for most of the calibration loads are
listed in Table 5.4. A schematic is shown in Figure 5.1 for the photodiode
calibration circuit, with the required components listed in Table 5.3.
Table 5.3 Required Photodiode Current Source Calibration (I
68
LDC-3926339
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DC Amps (@ 6.0 A): ±0.02 %
DC Volts (@10 V range): ±0.005 %
0.1 µA or 0.1 mV resolution
Figure 5.1 I
R1 15 Ω resistor, 5% 3 W
R2 100 Ω resistor, 1%, 1/4 W
R4 100 Ω resistor, 1% 1/4 W
1
R5 100 Ω resistor, 1% 1/4 W
Calibration Circuit
PD

) Circuit Components

PD