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Section
IV
Model
339A
Figure
4-13.
Input
Impedance
Test.
a.
Set the
339A
controls as follows:
FUNCTION
INPUT LEVEL
FILTERS
OFF
(out)
INPUT
RANGE
IV
INPUT/
GND
SELECT
....
DIS.
AN./J.
(center position)
Connect
the
equipment
as
shown
in
Figure
4-13.
c.
Set the
Synthesizer
(3330B)
for
an
output frequency
of
1
kHz
and
adjust the
amplitude
as
necessary
to
obtain
a
meter reading
of 0
dB
on
the
339A.
d.
Set the
Spectrum
Analyzer
(3571
A)
reference
by
pressing the Enter Offset button.
Observe
a
display
reading
of
00.00 dB.
e.
Disconnect
the cable
from
the
339A
and
insert
the
1
00
k
C2
resistor
in
series
with
the input.
The Spectrum
Analyzer must
indicate -6.02
dB
±
.05
dB.
f.
Change
the
Synthesizer frequency
to
17.000
kHz.
The Spectrum
Analyzer
reading
must
be
less
than
-9.00
dB
indicating
an
input capacitance of
less
than
100 pF.
4-12
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