4-3 Bias Tee (Option 10) Operational Check Options Performance Verification
4-4 PN: 10580-00307 Rev. D MS20xxC MM
4-3 Bias Tee (Option 10) Operational Check
If the Bias Tee (Option 10) is installed in the VNA Master, then the following test can be used to verify the
internal bias tee functionality in the Vector Network Analyzer mode of MS2026C, MS2027C, MS2028C,
MS2036C, MS2037C or MS2038C.
Equipment Required
• 40 ohm, 5 watt, High Current Load, Anritsu T2904
• 78 ohm, 1 watt, Low Current Load, Anritsu T3536
• 105 ohm, 1 watt, Low Current Load, Anritsu T3377
• AC Power Adapter
Procedure
1. Connect the AC Power Adapter to the VNA Master.
2. Press the On/Off key to turn on the VNA Master.
3. For an MS20xxC VNA Master, press the Shift key and then the Mode (9) key. Use the rotary knob to
highlight Vector Network Analyzer, and then press the Enter key to switch to Vector Network Analyzer
mode.
4. Press the Shift key, the Preset (1) key, and then the Preset soft key to reset the instrument to the default
starting conditions.
5. Press the Freq/Time/Dist hard key and then press the Start Freq soft key.
6. Enter 10, then press the MHz soft key to set the Start Frequency to 10 MHz.
7. Press the Measure hard key and then the S-Parameter soft key. Select S21 and press the Enter key to
accept the selection.
8. Press the Number of Traces soft key and then press 1.
9. Press the Maximize Active Trace soft key.
10. Press the Sweep hard key, the Configure Ports soft key, and then the Bias Tee Setup soft key.
11. Press the Int Port Selection soft key to change to bias output to Port 1.
Voltage and Current Test
12. Connect the 105 ohm load to Port 1.
13. Ensure that the Int Voltage P1 setting is 12.0 V.
14. Press the Bias Tee soft key and then the Internal soft key to turn On the Internal Bias Tee.
15. Verify that the voltage and current readings that are displayed in the upper-left corner of the screen are
within the ranges shown in Table 4-2.
16. Press the Bias Tee soft key and then the Off soft key to turn Off the Internal Bias Tee.
17. Press the Int Voltage P1 soft key. Change the voltage to 18.0 V.
18. Repeat Step 14 through Step 16.
19. Remove the 105 ohm Load from Port 1, and connect the 78 ohm Load to Port 1.
Note The VNA Master must be powered by the AC Adapter for this test.
Note Before continuing, allow a 30-minute warm up for the internal circuitry to stabilize.
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