Agilent Technologies E1401-90493 RefAtten40dB 10 dB Actual40dB 1 dB Actual0dB

Chapter 2 419
Performance Verification Tests
59. Comms Absolute Power Accuracy (Options BAC or BAH)
Part 2: cdmaOne Receive Channel Power (Preamp Off)
Table 2-127 lists the reference level, input attenuation, and nominal
input level for the analyzer, and nominal attenuation for the calibrated
1 dB and 10 dB step attenuators for the amplitude accuracy
measurements.
1. Set the 10 dB step attenuator to 40 dB and the 1 dB step attenuator
to 0 dB.
2. Obtain the actual attenuation for the 0 dB setting of each attenuator
at 50 MHz from the metrology data for the step attenuators. In some
cases this value might be zero, by definition. Add the two actual
attenuations to obtain the 0 dB reference attenuation.
For example, if the actual attenuation for the 10 dB step attenuator
at the 0 dB setting is 40.03 dB, then 10 dB Actual40dB is 40.03 dB. If
the actual attenuation for the 1 dB step attenuator at the 0 dB
setting is 0.02 dB, then 1 dB Actual0dB is 0.02 dB. In this case
RefAtten40dB is 40.05 dB.
3. Obtain the metrology data for the step attenuators at 50 MHz.
4. Calculate the actual total attenuation by adding the actual
attenuation for the 1 dB step attenuator to the actual attenuation for
the 10 dB step attenuator for each total attenuation setting listed in
Table 2-128.
Table 2-127 cdmaOne Receive Channel Power, Preamp Off (Option BAC)
Nominal
Input
Amplitude
(dBm)
Reference
Level
(dBm)
Resolution
Bandwidth
(kHz)
Input
Attenuation
(dB)
1 dB Step
Attenuator
(dB)
10 dB Step
Attenuator
(dB)
Source
Nominal
Level
(dBm)
−40 −20 10 0 0 40 0
−40 −40 10 0 0 40 0
−60 −40 10 0 0 60 0
−60 −60 10 0 0 60 0
−70 −50 10 0 0 70 0
−70−70 10 0 0 70 0
−80 −60 10 0 0 80 0
−80 −80 10 0 0 80 0
−85 −65 10 0 5 80 0
−85 −85 10 0 5 80 0
RefAtten40dB 10 dB Actual40dB 1 dB Actual0dB +=