Voltage Measurement Accuracy - Keithley 2520 Service Manual

Model 2520 Pulsed Laser Diode Test System Service Manual

Voltage measurement accuracy

Follow the steps below to verify that Model 2520 laser diode voltage measurement
accuracy is within specified limits. This test involves applying accurate voltages from a
DC calibrator, and verifying that the Model 2520 voltage readings are within specified
limits.
1.
2.
3.
4.
5.
6.
7.
Table 1-2
Voltage measurement accuracy limits
Model 2520
range
05V
10V
With the power off, connect the voltage calibrator to the testhead VOLTAGE
SENSE jacks, as shown in
Turn on the Model 2520 and calibrator, and allow them to warm up for a minimum
of one hour.
Restore BENCH defaults as covered previously in
page 1-6.
Press the LASER V key, then select the Model 2520 5V range with the RANGE
L
key.
Set the calibrator source voltage to +5.0000V, and turn on the output.
Press the TRIG key, then verify the Model 2520 voltage reading is within the limits
for the 5V range shown in
Repeat steps 4 through 6 for the 10V range with a 10V input voltage, as covered in
Table 1-2.
Calibrator
voltage
05.0000V
10.000V
Figure 1-2.
Table 1-2.
Voltage reading limits
(1 year, 18°C to 28°C)
4.9785 to 5.0215V
9.962 to 10.038V
Performance Verification
"Restoring factory defaults" on
1-9