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through 26 give the step gain errors. Acceptable error is fl dB. Locations of the correction
data are given in Table l-l.
1 0
C O R R ' D
C E N T E R
-10
Step Gain
A20 dB A10
Control Line
assembly) assembly)
Line
Calibration
26
The A2dB, A4dB, and A8dB circuitry of the AO.0 to A15.9 Attenuator is activated by the
following routine. First, connect a 1 dB step attenuator between CAL OUTPUT and the
input to the analyzer. Set this attenuator to 10 dB, press Instrument Preset, and key in the
following:
LOG SCALE
Press [SINGLE) sweep and repeatedly press the DATA STEP @ key. The display should
appear as in Figure 7. If every other step is missing, the AVdB control line is faulty. Check
the AldB circuitry on the A4A9 IF Control board to find the defective component. If
6
R E F . O dBm
I
E S
V B W 1 0 kHz
Figure 6. Error Correction Routine Data
Table 1. Locations of Step Gain Calibration Data
-20
-30
25
24
0
I
I
I
I
S P A N 1 . 0 0 M H z
- 4 0
- 5 0
23
22
equal to the CAL OUTPUT frequency
I
0
- 6 0
21
20
0 Hz
1 dB
20 s
-10 dBm
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