HP 8568B manual If Gain Uncertainty Test, DBm to -55.9 dBm DBm to -129.9 dBm

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

0 dBm to -55.9 dBm

-56.0 dBm to -129.9 dBm

Uncertainty (uncorrected; 20 - 30°C)

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

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

ADAPTER

SIGNAL INPU

STEP ATTENUATOR

HP355CbHE9

- - - -

STEP ATTENUATOR

HP355C-HZ5

ADAPTER

Figure 2-17. IF Gain Uncertainty Test Setup

Performance Tests 2 - 33