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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.
TABLE
59.
LOG GAIN ADJUSTMENT LIMITS
=&tenvator
I
Reference Level (dBrn)
I
DVM
Reading*
*After subtracting offset.
0
10
20
30
40
28. Set spectrum analyzer controls as follows:
REFERENCELEVEL
....................................................
-50dBm
.........................................................
Amplitude Scale 1 dB/DIV
-
5
0
-
60
-
7
0
-
80
-
9
0
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.
Ref:
800
*
1
mV
800 +30 mV
800 +30 mV
800 +30 mV
800 +30 mV
30.
Return TEST-NORM switch
A12S1 to NORM.