Tektronix SPG8000 Technical Reference page 68

Performance verification
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5. Configure the GPI 1 output to be asserted on unlock as follows:
a. Press the SYSTEM button on the SPG8000 under test.
b. Use the down (▼) arrow button to select GPI, and then press the ENTER
button.
c. Use the down (▼) arrow button to select GPI : OUTPUT 1, and then
press the ENTER button.
d. Use the down (▼) arrow button to select LOCK ERROR.
e. Press the right (►) arrow button to select Enable, and then press the
ENTER button.
6. Check that the voltage on the GPI 1 output measures between 4.5 V and 5.5 V.
7. Record the result in the test record.
8. Disconnect the reference input to the SPG8000 under test. After 15 seconds,
check that the GPI 1 output is below 0.5 V.
9. Record the result in the test record.
10. Reconnect the cable from the reference unit to the reference input on the
SPG8000 under test.
11. Repeat steps 5 through 10 for the GPI 2 output.
12. Solder a wire to pin 6 of the male 9-pin DSUB connector.
13. Use test leads to attach the voltmeter to the pin-6 wire from the DSUB
connector and to chassis ground.
14. Repeat steps 5 through 10 for the GPI 3 output.
15. Disconnect the GPI 3 output from the voltmeter.
SPG8000 Specifications and Performance Verification