HP 8559A Step, REFERENCE, Corrected, Deviation from, Step Attenuator, PERFORMANCE TESTS, Step Accuracy in Linear Mode, 4-23.REFERENCE LEVEL ACCURACY(Cont'd)

MODEL8559A PERFORMANCETESTS

PERFORMANCE TESTS

4-23. REFERENCE LEVEL ACCURACY(Cont'd)

TABLE 4-10. IFGAIN ACCURACY IN LOG MODE

REFERENCE	Step	Deviation from		Step Attenuator		Corrected
LEVEL	Attenuator		6th Division	Error (Calibration)"		Deviation
Setting (dBm)	Setting (dB)		(dB)		(dB)	(dB)
	o		0 (Ref)		(Ref)
	10
	20
	30
	40
	50
	60
	70
	80
	90

*Attenuations >dial settings are positive (+). Attenuations <dial settings are negative (-).For example, 9.99 dB calibration for a 10 dB attenuator setting represents an error of -0.01 dB.

Step Accuracy in Linear Mode

Set spectrum analyzer Amplitude Scale switch to LIN and REFERENCE LEVEL control to - 10 dBm. Set step attenuator to 0 dB. Readjust signal generator OUTPUT LEVEL control to position peak of signal 6 divisions above graticule baseline.

Set step attenuator and spectrum analyzer REFERENCE LEVEL control to settings indicated in Table 4-11. Record deviation of signal peak from 6th division for each setting.

Using Table 4-12, convert Deviation from 6th Division in Linear Mode to Deviation in dB for each setting. Record dB values in Table 4-11.

To calculate Corrected Deviation, add Step Attenuator Error to Deviation from 6th Division in dB for each setting. Corrected Deviation should not exceed +0.5 dB from - 10 dBm to -80 dBm and +1.0 dB from - 10 dBm to - 100 dBm. Record maximum values.