HP 8559A Operation And Service Manual page 124

ADJUSTMENTS
5-19. LOG AMPLIFIER LOG AND LINEAR ADJUSTMENTS (Cont'd)
Log Gain
24. Set spectrum analyzer controls as follows:
REFERENCE LEVEL
25. Set 10-dB step attenuator to 0 dB. Retune spectrum analyzer to peak signal. Adjust signal generator
OUTPUT LEVEL for DVM reading
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.
0
10
20
30
40
*After subtracting offset.
28. Set spectrum analyzer controls as follows:
REFERENCELEVEL
Amplitude Scale
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
amplifier output.
30. Return TEST-NORM switch A12S1 to NORM.
ADJUSTMENTS
1 mV) of 800 mV plus offset recorded in step 4, as measured at
TABLE 59. LOG GAIN ADJUSTMENT LIMITS
Reference Level (dBrn)
- 5 0
-60
- 7 0
-80
- 9 0
.........................................................
1 mV) of 800 mV plus offset recorded in step 4, as measured at
DVM Reading*
800 1 mV
Ref:
800 +30 mV
800 +30 mV
800 +30 mV
800 +30 mV
MODEL 8559A
50 dBm
-
1 dB/DIV