Tektronix SPG8000 Technical Reference page 93

Antenna current and fault
thresholds test
SPG8000 Specifications and Performance Verification
Perform the following procedure to check that the antenna current and fault
thresholds are within limits.
1. Use the equipment connection from the previous test. (See Figure 21 on
page 77.)
2. Set the antenna voltage to 5 V, if it is not already, 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 5 Volt.
d. Press the ENTER button.
3. Check that the antenna power LED on the rear panel of the SPG8000 is
flashing green. This indicates an open circuit.
4. Record Pass or Fail in the test record.
5. Apply a 75 Ω precision terminator to the BNC T connector.
6. Check that the voltage is between 4.5 V and 5 V.
7. Record the result in the test record.
8. Check that the antenna power LED on the SPG8000 rear panel is a steady
green. This indicates a nominal load.
9. Record the Pass or Fail in the test record.
10. Remove the BNC-to-Banana adapter from the BNC T, and install a second
BNC T and a precision terminator on the end of the cable to the antenna input.
This will exceed the allowed current on the antenna.
11. Check that the antenna power LED on the SPG8000 rear panel is a steady red.
This indicates a short circuit.
12. Record the result in the test record.
Performance verification
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