HP 3400A Service Manual

Model
3400A
Maintenance
5-10. Input Impedance Check
5-11. Resistance Check. Do the following:
a.
Connect
the
Test
Oscillator,
50
ohm
feedthru
and
-hp-
Model
3400A
to
position
A
in
Figure
5-3.
b. Set 3400A to 1 volt range and Test Oscillator to 400 Hz.
c.
Adjust
Test
Oscillator
output
for
1
volt
indication
on
Model
3400A.
d.
Connect
Model
3400A
to
position
B,
as
shown
in
Figure
5-3.
The
3400A
meter
reading
now
should
change
less
than
or
equal
to
.02
volts
(2
minor
divisions).
2
minor
divisions
cor-
responds
to
an
input
impedance
of
10
megohms.
hp3400A
TEST
OSCILLATOR
RMS
VOLTMETER
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SOQ FEEO-THRU
TERMINATION
Apiio4es
200Kn
Ap 0757-0782
Figure 5-3. input impedance Test Setup
5-12.
Capacitance
Check.
Do
the
following:
a.
Connect
the
Test
Oscillator,
50
ohm
feedthru
termination,
and
the
-hp-
Model
3400A
as
shown
in
Figure
5-3.
Make
sure
the
3400A
is
connected
to
position
B,
and
NOT
position
A.
Insert
the
resistor
directly
into
the
3400A’s
input
BNC
and
connect
the
other
end
to
the
feedthru
termination.
This
minimizes
the
effect
of
any
external
capacitance.
b.
Set
the
3400A
to
the
.001
V
range
and
the
Test
Oscillator
for
a
400
Hz
output.
c.
Adjust
the
Test
Oscillator
for
a
full
scale
reading
on
the
3400A.
d.
Change
the
Test
Oscillator
frequency
to
16
kHz
and
make
sure
the
34004
reading
is
greater
than
.707
mV.
This
corresponds
to
an
input
shunt
capacitance
of
less
than
50
pF.
e.
Set
the
3400A
to
the
1
V
range
and
the
Test
Oscillator
for
a
400
Hz
output.
Repeat
step
c.
f.
Change
the
Test
Oscillator
frequency
to
40
kHz
and
make
sure
the
3400A
reading
is
greater
than
.707
V.
This
corresponds
to
an
input
shunt
capacitance
of
less
than
20
pF.

HP 3400A Specifications

General

Brand	HP
Model	3400A
Category	Measuring Instruments
Language	English