HP ESA-L1500A, Руководство пользователя и калибровки

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212 Chapter 9
Performance Verification Tests
7. Reference Level Accuracy
7. Reference Level Accuracy
A 50 MHz CW signal is applied to the Input 50
Ω
of the analyzer
through two step attenuators. The amplitude of the source is decreased
in 10 dB steps and the analyzer marker functions are used to measure
the amplitude difference between steps. The source’s internal
attenuator is used as the reference standard. The test is performed in
both log and linear amplitude scales.
It is only necessary to test reference levels as low as
−
90 dBm (with
10 dB attenuation) since lower reference levels are a function of the
analyzer microprocessor manipulating the trace data. There is no error
associated with the trace data manipulation.
Equipment Required
Synthesized signal generator
1 dB step attenuator
10 dB step attenuator
Attenuator/ switch driver (if programmable step attenuators are
used)
Cable, Type-N 152-cm (60-in)
Cable, BNC 122-cm (48-in) (2 required)
Attenuator interconnect kit
Adapter, Type-N (m) to BNC (f) (2 required)
Additional Equipment for 75
Ω
Input
Pad, minimum loss
Adapter, Type-N (f), to BNC (m), 75
Ω
Procedure
Calculate Actual Attenuation Errors
1. From the calibration data supplied with the 10 dB step attenuator,
enter into column 2 of Table 9-7 and Table 9-8 the actual attenuation
for the corresponding nominal attenuation settings. If using a
programmable attenuator, enter the data for the section three 40 dB
step.
2. Calculate the reference attenuation error by subtracting 40 dB from
the actual attenuation for the 40 dB setting, and enter below.