Keithley 2520, Руководство по обслуживанию, Страница: 21 / 137

Model 2520 Pulsed Laser Diode Test System Service Manual Performance Verification 1-9
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. With the power off, connect the voltage calibrator to the testhead VOLTAGE
SENSE jacks, as shown in Figure 1-2 .
2. Turn on the Model 2520 and calibrator, and allow them to warm up for a minimum
of one hour.
3. Restore BENCH defaults as covered previously in “Restoring factory defaults” on
page 1-6 .
4. Press the LASER V
L
key, then select the Model 2520 5V range with the RANGE
key.
5. Set the calibrator source voltage to +5.0000V, and turn on the output.
6. Press the TRIG key, then verify the Model 2520 voltage reading is within the limits
for the 5V range shown in Table 1-2 .
7. Repeat steps 4 through 6 for the 10V range with a 10V input voltage, as covered in
Table 1-2 .
Table 1-2
Voltage measurement accuracy limits
Model 2520
range Calibrator
voltage Voltage reading limits
(1 year, 18°C to 28°C)
0 5V 0 5.0000V 4.9785 to 5.0215V
10V 10.000V 9.962 to 10.038V