4-4 GPS (Option 31) Operational Check Options Performance Verification
4-6 PN: 10580-00307 Rev. D MS20xxC MM
4-4 GPS (Option 31) Operational Check
The following test is used to verify the operation of the GPS option in the Vector Network Analyzer mode of
MS2026C, MS2027C, MS2028C, MS2036C, MS2037C or MS2038C.
Equipment Required
• GPS Antenna, Anritsu part number 2000-1528-R or Trimble part number 57861-00
• SMA(m) to BNC(f) Adapter, Pomona part number 4290
• BNC(m) 93 ohm Terminator, Amphenol part number B1004A1-ND3G-93R-0.05-1W
• AC Power Adapter
Procedure
GPS Antenna Bias Tee Operational Check
1. Connect the SMA(m) to BNC(f) Adapter to the GPS connector of the VNA Master.
2. Connect the BNC(m) 93 ohm terminator to the BNC(f) end of the adapter.
3. Connect the external AC Power Adapter to the VNA Master and then plug the power cord of the AC
Power Adapter to an AC outlet.
4. Press the On/Off key to turn on the VNA Master.
5. Press the Shift key, the Preset (1) key, and then the Preset soft key to reset the instrument to the default
starting conditions.
6. Press the Shift key, and then press the System (8) key.
7. Press the GPS soft key
8. Confirm that the 3.3 V setting on the GPS Voltage soft key is selected (underlined). If not, then press the
soft key to toggle the setting to 3.3 V.
9. Press the GPS On/Off soft key to turn On GPS.
10. Press the GPS Info soft key and wait until the GPS INFO dialog box is displayed in the sweep window.
11. Verify that the GPS Antenna Current is within the expected current range for 3.3 V Bias in accord with
Table 4-3.
12. Press the Esc key to dismiss the GPS INFO dialog box.
13. Press the GPS Voltage soft key to toggle the setting to 5V.
14. Press the GPS Info soft key and wait until the GPS INFO dialog box appears.
15. Verify that the GPS Antenna Current is within the expected current range for 5 V Bias in accord with
Table 4-3.
Note The VNA Master must be powered by external AC power for this test.
Note Before continuing, allow a 30-minute warm up for the internal circuitry to stabilize.
Table 4-3. GPS Antenna Bias Tee Operational Check
Voltage Setting Expected Current Range
3.3 V 27 mA to 38 mA
5 V 42 mA to 64 mA
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