Chapter 3 — Performance Verification 3-10 1 GHz Calibrator VSWR Verification
ML248xx, ML249xA MM PN: 13000-00164 Rev. K 3-19
3-10 1 GHz Calibrator VSWR Verification
(ML248xx-Option 15, ML249xA)
The following procedure is used to measure the VSWR of the RF Calibrator port when the 1 GHz Calibrator is
selected on the ML248xx (with option 15) and ML249xA power meters. This procedure uses many calculations.
It’s recommended to use a spreadsheet to enter the equations and calculate the results.
Required Equipment
• Agilent N432A Power Meter
• Agilent 8478B Power Sensor
• Agilent 34401A DMM or equivalent
• Anritsu S820E VNA, or equivalent
Recording Results
Record measurements and calculations within this procedure, and record the final VSWR result within the
Test Records on page A-11.
Procedure
1. Power off the N432A.
2. Connect the power sensor cable to the N432A without connecting the power sensor.
3. Refer to Figure 3-8. Measure the resistance from the Vrf BNC center conductor on the rear of the N432A
to Pin 1 of the sensor cable.
4. Power on the N432A.
5. Go to the Channel Menu of the N432A and then scroll through the menu to select Bridge Resistance.
6. The internal N432A resistance can be changed between the 100, 200, 300 and 400 ohm settings. Select
the 100 ohm setting.
7. Power off the N432A.
8. With a DMM, measure the resistance of the new Bridge Resistance setting.
9. Record the measurement below.
10. Repeat step 4 through 9 to measure and record the measurements for the 200, 300, 400 Ohm settings.
11. Record the 4 resistance measurements below.
R
100
= ______________ (A value near 100 ohms)
R
200
= ______________ (A value near 200 ohms)
R
300
= ______________ (A value near 300 ohms)
R
400
= ______________ (A value near 400 ohms)
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