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HP 492A Operating And Service Manual page 14

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Model 492A/494A
Section III
Figure 3-6
)
1600+-----+-----1
-.::..bp--
MODEL 494A
TYPICAL MODULATION CHARACTERISTICS
INPUT
-6
OBM
-21 OBM
-250BM
-280BM
-31 OBM
OUTPUT
- - - - - - - 0 DB
- ' - ' - ' 3 0 B
............- _
6 DB
- , , - , , - 9 DB
- - - - 1 2 DB
FREQUENCY
: 9000 Me
HELIX VOLTAGE: OPTIMIZED AT
Eg=O
FOR EACH CURVE.
OUTPUT : DB BELOW SATURATION
OUTPUT AT
E
g
=
0
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800
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6 00
+--4-~.____--+-.:,.-----4---;.-+-----l..-____,r----__r___---......,.....---_+---__l
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0~---_+_---_+_----1f_--==:..::.!!!~---_+_---_+---___l
1400+------+--~
1200
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+10
o
-10
GRID
-20
-30
BIAS
VOLTS
-40
-50
G-M-37
-60
Figure 3-6. Typical Plot of Output Voltage
VB
Grid Voltage of a Model 494A
00144-2
3-5

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