Voltage Standing Wave Ratio (Vswr) Performance Verification - Keysight Technologies U8480 Series Service Manual

2 Performance Verification and Adjustments

Voltage Standing Wave Ratio (VSWR) Performance Verification

VSWR is a measure of how efficiently RF power is transmitted from an RF power
source. In real systems, mismatched impedances between the RF source and
load can cause some of the power to be reflected back towards the source and
vary the VSWR.
Procedure (DC to 10 MHz)
This performance verification requires the following equipment:
– network analyzer (E5071C)
– mechanical calibration kit (85054B/D)
1 Turn on the network analyzer and allow it to warm up for approximately an
2 Set the start frequency of the network analyzer to 9 kHz and the stop
3 Calibrate the network analyzer using the appropriate calibration kit. Perform
4 After calibration, connect the U8480 Series to the test port of the network
5 Compare the measured results to the specifications in the datasheet. If the
Procedure (10 MHz to 120 GHz)
This performance verification requires the following equipment:
– network analyzer (E8361A/3B/4B/N5227B)
– calibration kit (85054B/D, 85056A/D, 85058B/E, 85059B)
1 Turn on the network analyzer and allow it to warm up for approximately an hour.
2 Set the start frequency of the network analyzer to 10 MHz and the stop
3 Calibrate the network analyzer using the appropriate calibration kit (85054B/D
22
hour.
frequency to 10 MHz (for the Option 200).
calibration for the open, short, and load circuits of the network analyzer.
analyzer. Turn on Correction on the network analyzer to perform the VSWR
measurement.
verification fails, refer to
frequency to 18 GHz (for the U8481A), 33 GHz (for the U8485A), 50 GHz
(for the U8487A), 67 GHz (for the U8488A), or 120 GHz (for the U8489A).
for the U8481A, 85052B/C for the U8485A, 85056A/D for the U8487A,
"Adjustments" on page 31.
Keysight U8480 Series Service Guide