Keysight Technologies N8262A, Service Manual

Page: 46 / 125

2 Performance Tests
46 Keysight N8262A Service Guide
Output Standing Wave Ratio (SWR) Test
Description
Connector mismatch is the largest single contributor to measurement uncertainty,
so this specification must be warranted to provide assurance of instrument
accuracy. The 1 mW power reference level test must be carried out prior to this
test, as the VSWR specification is only valid at 1 mW. This test measures VSWR by
equating relative powers (measured by the test system power meter and its
sensors) when the power reference is exercised under different load conditions.
Equipment
– Required test equipment:
1 unit of 8753ES/ET network analyzer
1 unit of 85032B type-N calibration kit
1 unit of E4419B or E4417A dual channel power meter
2 units of 8481D power sensor
2 units of 11667A #001 power splitter
1 unit of 20 dB pad, male to female (e. g. 8491A)
1 unit of 30 dB pad (e.g. 11708A reference attenuator)
– An alternative network analyzer can be used, as long as it can measure S11 in
the 45 to 55 MHz range
– Either of the E4419B or E4417A power meter can be used
– The specific models of power sensors and power splitters listed above must be
used
– Any type of pad can be used (as long as there are no additional mating
connections or differing pad values)
– 1 unit of 11667A, 1 unit of 8481D, and the 30 dB pad combine to create the
‘Calibration System’
– 1 unit of 11667A, 1 unit of 8481D, and the 20 dB pad combine to create the
‘Measurement System’