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Chapter 2 107
Performance Verification Tests
14. Reference Level Accuracy: Agilent E4401B and E4411B
14. Reference Level Accuracy: Agilent E4401B
and E4411B
A 50 MHz CW signal is applied to the 50 Ω input 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 external 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 (−41.25
dBmv for 75
Ω inputs) (with 10 dB internal 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.
The related adjustment for this performance test is “IF Amplitude.”
Equipment Required
Synthesized signal generator
1 dB step attenuator
10 dB step attenuator
6 dB fixed attenuator (2 required)
Attenuator switch driver (if programmable step attenuators are
used)
Cable, Type-N 152-cm (60-in) (2 required)
Cable, BNC 122-cm (48-in)
Attenuator interconnect kit
Additional Equipment for 75 Ω Input
Pad, minimum loss
Adapter, Type-N (f), to BNC (m), 75
Ω