7-2 2-Port Gain Measurements Chapter 7 — Built-In Bias Tee, Option 10
7-2 MS20xxA VNA Master UG 10580-00166 Rev. C
7-2 2-Port Gain Measurements
Two power levels are available with 2-port measurements: High (0 dBm) and Low (-35 dBm).
The low power setting should be used when making direct gain measurements of amplifiers.
This will ensure that the amplifier is operating in the linear region. The High power setting is
ideal when characterizing passive devices but can also be used when making relative gain or
antenna-to-antenna isolation measurements in the field.
The Variable Bias Tee Option (Option 10) can be used to place between +12V and +24V on the
center conductor of the
RF In port. It is designed to deliver 500 mA at +12V and 250 mA at
+24V.
Also refer to “Bias Tee Option” on page 7-4 in the sweep menu section.
Example 1
This example describes an S21 measurement of an attenuator.
Procedure
1. Ensure that the instrument is in Vector Network Analyzer mode and press the Shift key
and the
System (8) key, then press the Application Options soft key.
2. The
Meas Menu soft key toggles between Field and VNA. The active measurement function
is underlined.
3. Press the soft key (if necessary) until VNA
is underlined, then press the Back key.
4. The Measurement soft key menu now displays VNA measurement options.
5. If a test port extension cable is to be used, then connect it to the
RF Out connector on the
VNA Master.
6. Press the
Measurement function hard key and select S21 Transmission | Log Magnitude.
7. Press the Shift key, then the Sweep (3) key.
8. Select the
Power soft key and set power to High.
9. Press the
Freq/Dist function hard key and set the Start Frequency and Stop Frequency.
10. Press the
Shift key, then the Calibrate (2) key.
11. Press the
Start Cal soft key and perform a 2-port OSL calibration at the connector or at
end of the extension cable. Follow the instructions on the display or refer to section “3-3
Calibration” on page 3-3 for more details.
12. When the Calibration is finished,
Cal Status On should be displayed in the upper left part
of the display, and the trace should be a flat trace at 0 dB.
10580-00166C.book Page 2 Thursday, February 21, 2008 12:52 PM
To Next Page
Loading...
