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MODEL 8559A PERFORMANCE TESTS
PERFORMANCE
TESTS
4
-
23.
REFERENCE LEVEL ACCURACY (Cont'd)
Vernier Accuracy
9.
Replace 10
-
dB step attenuator with 1
-
dB step attenuator. Set spectrum analyzer controls as follows:
FREQUENCY BAND
GHz
..................................................
.01- 3
..............................................................
TUNING 0.030GHz
..........................................................
FREQSPAN/DIV 50kHz
RESOLUTION BW
..............................................
300 kHz, uncoupled
..............................................................
INPUTATTEN OdB
REFERENCE LEVEL
....................................................
-
10 dBm
..............................................................
REFLEVELFINE 0
Amplitude Scale
.........................................................
1 dB/DIV
........................................................
SWEEPTIME/DIV AUTO
SWEEPTRIGGER
.....................................................
FREERUN
ALT IF
.....................................................................
OFF
.................................................................
SIGIDENT OFF
....................................................................
BLCLIP OFF
..........................................................
VIDEOFILTER 2o'clock
10.
Set step attenuator to
0 dB. Center signal on CRT and adjust signal generator OUTPUT LEVEL control
to position peak of signal 6 divisions above graticule baseline. Set step attenuator and spectrum analyzer
REFERENCE LEVEL FINE control to settings indicated in Table 4
-
13. Record deviation of signal peak
from 6th division for each setting.
11.
To compute Corrected Deviation, add Step Attenuator Error to Deviation from 6th Division for each
setting. Corrected Deviation should not exceed
k
0.5 dB for each setting. Record maximum value.
TABLE
4
-
13.
VERNIER ACCURACY
Step Attenuator
Setting
(dB)
--
-
REFERENCE
LEVEL FINE
Setting
-
--
Deviation from
6th Division
(dB)
0
(Ref)
Step Attenuator
Error (Calibration)*
(dB)
Corrected
Deviation
(dB)
*Attenuations
>
dial settings are positive
(t).
Attenuations
<
diaI settings are negative
(
-
).