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HP 460A Operating Manual page 7

Wide band amplifier serial 1996 and above
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200
ohms
load
-(<e-T-(-~'~--­
...1
Model 460A
OUTPUT
Model 460A
OUTPUT
Connect across output Jack
- - inside ins rument
--<~--f(-"+-\ --+~
620
To any
ohms
load
#812-52
200 ohm
cable
LO
LO
-
0 '
-
N
-
The GAIN control will vary the gain of the amplifier over a
ange
of approximately 6 db.
This control is provided so that the gain
of the amplifier can be set to a known value if necessary.
There
is no feedback in the amplifier D so the gain is directly propor-
tional to the Gm of the tubes.
The gain is also determined by he
output load and will vary with output load in accordance with th
relation
280 X ZL
280
+
ZL
The Wide Band Amplifier can be used with the
0jJ
Model 410B*
Vacuum Tube Voltme er to provide additional sensitivity in meas-
uring high frequencies.
A special adaptor is a ailable to connect
the probe of the Model 410B* to the output terminal
0
the amplifi r.
The overall frequency response of the Model 460A. in combination
with the Model 410B. is within 1 db out to 190 mc.
This combI-
nation will give a full scale meter reading on the Model 410B with
1 / 1 0 volt applied to the input of the Model 460A.
Several amplifiers can be cascaded when more than 20 db gain is
desired.
The maximum gain which can be used will be limited by
the effective noise generated in the input circuit of the amplifier.
The noise factor is approximately 10 db.
The time of rise of a single unit is approximately 2. 6 millimicro-
seconds.
As units are cascaded D the time of rise goes up as the
square root of the sum of the squares of times of rise of he
individual stages.
Therefore. for two stages in cascadeD the time
*
Also Model 4l0A
-3 -

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