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Section V Model 3555B
Table 5-9. Range Attenuation and Amplifier Gain
Attenuator Pads Used Amplifier Gain
(See Figure 7-3) Switching
RANGES 1 2 3 4
+30 X X X
+20 X X X
+10 X X
0 X X
-10 X X
-20 X
-30 X
-40 X
-50
-60 A2R13, A2R14
-70 A2R13
-80
Ranges Affected +30 -20 +30 +20 -60 and -70
If Defective +20 thru 0 -10
+10 +30 -30 -40
Table 5-11. Factory Selected Values
Designator Purpose
C4 Adjust balance at 600kHz, 135 BAL
A1C5 Padding capacitor for A1 C4
A1C9 Adjust balance 20kHz, 600 BAL (VF/Nm)
A1C8 Padding capacitor for A1C7
A1C10 and Frequency response correction for A1TI
A1R12
A1R14 600 BAL, VF/Nm calibration
A3C1 Padding capacitor for A2C12
A3C15 Frequency response, 20Hz, -80dBm, 600
BAL (VF/Nm)
A3R46 Adjust the bias level for A3Q10 (-10V at +
side of A3C24)
A3R72 Response, 20Hz, 600 BAL (VF/Nm)
-70dBm and 20Hz, 900 BAL, 0dBm.
Compromise between these two settings.
A3R74and Meter tracking at 1/3 full scale. Resistors
A3R75 should be the same value.
Table 5-10. Resistance Checks
RANGE (dBm) Pin 1 to 3 Pin 2 to 3 Pin 1 to 2
-50 thru +30 154 kilohms 0 Infinity
-60 13 kilohms 28.64 kilohms 41.6 kilohms
-70 2.33 kilohms 28.64 kilohms 31 kilohms
-80 0 28.64 kilohms 28.64 kilohms
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