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

Chapter 2 423
Performance Verification Tests
59. Comms Absolute Power Accuracy (Options BAC or BAH)
Part 3: cdmaOne Receive Channel Power (Preamplifier On)
This procedure applies only to analyzers with Option 1DS
(preamplifier) installed.
Table 2-131 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.
Table 2-131 cdmaOne Receive Channel Power Preamp On (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
−90 −70 10 0 0 90 0
−90 −90 10 0 0 90 0
−100 −80 10 0 0 100 0
−100 −100 10 0 0 100 0
RefAtten40dB 10 dB Actual40dB 1 dB Actual0dB +=