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SecUon
VIII
THEORY
OF OPERATION
Model
3455A
connected
to
the
input
of
the
operational attenuator
is
connected
to
the E>C
Preamp
input
by
FET
switch
through
FET
switch
A10Q33
and
relay
AI0K6. The
attenu-
A10Q15.
A DC
preamp
gain
of
XIO
is
selected
by
FET
atur
is
set
to
a
gain
of
0.1
(10
to
I
attenuation)
by
FET
switch
AI0Q21. The
measurement
result
is
stored
by
the
switch
AI
0Q3S. The
output of
the operational attenuator
main
controller as the
lOO
V
dc
gain error constant.
Figure 8-13.
100
V
dc and
1000
V
dc Gain
Error
Measurement.
Figure 8-14.
100
V
dc Reference
Offset Error
Measurement.
8-8
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