HP 8559A Log Gain, ADJUSTMENTS, 5-19.LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS(Cont'd)

ADJUSTMENTS MODEL 8559A

ADJUSTMENTS

5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS(Cont'd)

Log Gain

24.Set spectrum analyzer controls as follows:

REFERENCE LEVEL ....................................................	- 50 dBm
Amplitudescale ..........................................................	ldb/DIV

25.Set 10-dB step attenuator to 0 dB. Retune spectrum analyzer to peak signal. Adjust signal generator OUTPUT LEVEL for DVM reading (+1 mV) of 800 mV plus offset recorded in step 4, as measured at Al5TP1.

26.Set 10-dB step attenuator to 40 dB. Set REFERENCE LEVEL to -90 dBm and adjust LOG GAIN control A14R121 for DVM reading of 800 mV plus offset recorded in step 4, as measured at Al5TP1.

27.Check log gain steps according to Table 5-9. If limits are not met, repeat steps 25 through 27. If limits still are not met, return to step 1.

	TABLE59. LOG GAIN ADJUSTMENT LIMITS
=&tenvator	I Reference Level (dBrn) I		DVM Reading*
0		-5 0	Ref: 800 *1 mV
10		-60	800	+30 mV
20		-7 0	800	+30 mV
30		-80	800 +30 mV
40		-9 0	800	+30 mV

*After subtracting offset.

28. Set spectrum analyzer controls as follows:

REFERENCELEVEL ....................................................	-50dBm
Amplitude Scale .........................................................	1 dB/DIV

29.Set both step attenuators to 0 dB. Reduce signal generator OUTPUT LEVEL until signal appears at top of display. Adjust spectrum analyzer FINE TUNE to peak trace on display and adjust signal generator OUTPUT LEVEL for DVM reading (k 1 mV) of 800 mV plus offset recorded in step 4, as measured at Al5TPl. Increase attenuation in 1-dB steps as shown in Table 5-10 and take DVM readings to check log amplifier output.

30.Return TEST-NORM switch A12S1 to NORM.