Operation of the Step Gains and AO.0 to A15.9 Attenuator can be determined from the
display by several easy tests.
The Step Gains are checked in the following way. Connect a 10 dB step attenuator between
CAL OUTPUT and the input to the analyzer. Set this attenuator to 90 dB, press Instrument
Preset, and key in the following:
( S W E E P ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 s
Press the [a] sweep key and press the DATA STEP @J key to display each step. Figure 5
should be displayed. If one or more of the steps is missing, refer to Note 8 for the Step Gain
truth table to determine which stage is faulty. 0 V in the table indicates that a control line is
active.
1 0
0 dBm
C E N T E R 2 0 . 0 0 0 0 0 0 M H z
N O T E : C e n t e r F r e q u e n c y r e a d o u t w i l l b e 1 0 0 . 0 0 0 0 0 0 M H z f o r a n HP8566B
If a component has been replaced, a simple calibration/diagnostic program exists. The
calibration routine is started by connecting a cable from CAL OUTPUT to the input of the
analyzer and then pressing
R E F - 9 9 . 9 dBn
0 dB
R E F -EVEL
- 9 9 . 3
I
I
I
R E S B W 1 kHz
V B W 1 0 H z
Figure 5. 10 dB Step Gain Test
w 'c will list the calibration data. (Refer to Figure 6). Lines 19
h
equal to the CAL OUTPUT frequency
I
I
I
I
I
I I
0 Hz
-10 dBm
AND SG20-1
I
I
S P A N 0 H z
0