Tektronix SPG8000 Technical Reference page 92

Performance verification
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6. Set the antenna voltage to 0 V as follows:
a. Press the REF button.
b. Use the up (▲) or down (▼) arrow button to select GPS ANTENNA
POWER.
c. Use the right (►) arrow button to select Off.
d. Press the ENTER button.
7. Check that the voltmeter shows 0 V.
8. Record the result in the test record for the 0 V entry.
9. Set the antenna voltage to 3.3 V as follows:
a. Use the right (►) arrow button to select 3.3 Volt.
b. Press the ENTER button.
10. Check that the voltmeter shows between 3.3 V and 4 V.
11. Record the result in the test record for the 3.3 V entry.
12. Now set the antenna voltage to 5 V as follows:
a. Use the right (►) arrow button to select 5 Volt.
b. Press the ENTER button.
13. Check that the voltmeter shows between 5 V and 6 V.
14. Record the result in the test record for the 5 V entry.
SPG8000 Specifications and Performance Verification