10. IF Gain Uncertainty Test

10.IF Gain Uncertainty Test

Related Adjustments Step Gain and 18.4 MHz Local Oscillator Adjustments

21.4 MHz Bandwidth Filter Adjustments

Specification Assuming the internal calibration signal is used to calibrate the reference level at -10 dBm and the input attenuator is fixed at 10 dB, any changes in reference level from the -10 dB setting will contribute to IF gain uncertainty as shown:

Range

Uncertainty (uncorrected; 20 - 30°C)

0 dBm to -55.9 dBm

Res BW 230 Hz, f0.6 dB; Res BW = 10 Hz, h1.6 dB

-56.0 dBm to -129.9 dBm Res BW 230 Hz, f1.0 dB; Res BW = 10 Hz, f2.0 dB

Description The IF gain steps are tested over the entire range from 0 dBm to -129.9 dBm using an RF substitution method. The 10 dB, 2 dB, and

0.1dB steps are compared against a calibrated signal source provided by an HP 3335A Frequency Synthesizer.

SIGNAL GENERATOR

SPECTRUM ANALYZER

 

 

 

RF OUTPUT

 

 

 

 

 

 

 

 

 

 

 

 

 

SIGNAL

INPU

ADAPTER

 

 

STEP

ATTENUATOR

 

ADAPTER

 

 

 

 

 

 

 

 

HP355CbHE9

 

 

 

-

-

 

 

 

-

-

 

 

 

 

STEP

ATTENUATOR

 

 

 

 

 

HP355C-HZ5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 2-17. IF Gain Uncertainty Test Setup

Performance Tests 2 - 33