HP 8559A Operation And Service Manual page 85

MODEL 8559A
4-23. REFERENCE LEVEL ACCURACY (Cont'd)
REFERENCE
LEVEL Attenuator
Setting (dBm) Setting (dB)
>
*Attenuations dial settings are positive
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
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
4-1 1. 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 4-1 1.
To calculate Corrected Deviation, add Step Attenuator Error to Deviation from 6th Division in dB for
each setting. Corrected Deviation should not exceed
from 10 dBm to 100 dBm. Record maximum values.
- -
PERFORMANCE TESTS
TABLE 4-10. IF GAIN ACCURACY IN LOG MODE
Step Deviation from
6th Division
o
10
20
30
40
50
60
70
80
90
Attenuations
Step Attenuator
Error (Calibration)"
dial settings are negative (-). For example, 9.99 dB
10 dBm to - 80 dBm and
0.5 dB from
-
PERFORMANCE TESTS
Corrected
Deviation
10 dBm.
-
1.0 dB