Tektronix SPG8000 Technical Reference page 96

Performance verification
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8. Check the signal quality on the SPG8000 under test as follows:
a. Press the STATUS button.
b. Press the down (▼) arrow button until you see STATUS : GPS.
c. Use the left (◄) or right (►) arrow button to view the GPS SIGNAL
QUALITY: 30.0 Sats: 4/4 readout. Check that the signal quality value is
greater than 30 and that the number of satellites is above 4/4.
9. Add attenuating pads between the antenna and the splitter until the signal
quality on the reference unit is in the 40 to 80 range.
10. Record the signal quality of the reference unit in the test record.
11. Check that the signal quality on the SPG8000 under test is within 20 counts
of the reference unit.
12. Record the difference between the reference unit and the SPG8000 under
test in the test record.
13. Remove the attenuators from the input to the splitter and reconnect the signal
from the antenna. If possible, leave the antenna on the SPG8000 under test
connected during subsequent tests to allow the system to stabilize.
SPG8000 Specifications and Performance Verification