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:
– An alternative network analyzer can be used, as long as it can measure S11 in
– These specific models of power sensors and power splitters must be used
– Any type of pad can be used (as long as there are no additional mating
– 1 unit of 11667A, 1 unit of 8481D, and the 30 dB pad combine to create the
– 1 unit of 11667A, 1 unit of 8481D, and the 20 dB pad combine to create the
Keysight N1913B/N1914B EPM Series Power Meters Service Guide
– 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)
– 2 units of 11730A power sensor cable
the 45 MHz to 55 MHz range
connections, or differing pad values)
'Calibration System'
'Measurement System'
Performance Tests
2
51