Technical data

Performance Tests 2
N1911A/1912A P-Series Power Meters Service Guide 25
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 unit of 8481D power sensor
2 unit of 11667A #001 power splitter
1 unit of 20dB pad, male to female (e. g. 8491A)
1 unit of 30dB pad (e. g. 11708A reference attenuator)
2 unit of 11730A power sensor cable
• An alternative network analyzer can be used, as long as it can measure
S11 in the 45 MHz - 55 MHz range
• Either of these E4419B or E4417A power meters can be used
• 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
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’