Frequency Response Check; Input Impedance Check; Resistance Check - HP 3400A Operating And Service Manual

Section
V Model 3400A
t,
VOLTMETER CALIBRATOR
A/J738BR
A/73400A
RMS VOLTMETER
DIGITAL
VOLTMETER
A/J3440A
•
°
®
V3443A
HIGH GAIN/
AUTO RANGE
UNIT
TO
D.C.
OUT
JACK
ON REAR
Figure
5-1.
Accuracy,
Linearity,
and
DC
Output Test Setup
5-9.
FREQUENCY RESPONSE CHECK.
•NOTE-
Connect 50fi
feedthru termination
directly to
3400A
INPUT
to elimi-
nate loss
in
output cable
at
high
frequency.
a.
Connect
test
setup illustrated
in
Figure 5-2.
b.
Set
Model 3400A
RANGE
switch
and Test
Oscillator output attenuator
to
1
volt position.
c.
Set
Test Oscillator for 400
Hz
output
and ad-
just output
amplitude
for the
reading obtained
in
Paragraph 5-8 step d on
the
Model 3400A.
d.
Switch
the
Test
Oscillator
monitor
switch to
expand
mode and
set
a convenient reference
level.
e.
Adjust
test oscillator output frequency
to
values
listed
under "frequency"
in
Table
5-3; adjust oscillator output voltage to
maintain reference
level set in
step
d. If
Model 3400A
does not indicate
within values
under
"meter
reading"
in
Table 5-3,
perform
high frequency
calibration
procedures,
Para-
graph
5-25.
Table
5-3.
Frequency Response Check
FREQUENCY METER READING
15
Hz
0.
95 to
1.
05
45
Hz
0.95
to
1.05
100
Hz
0.99 to
1.01
900
kHz
0.99
to
1.01
1.
2
MHz
0.98
to
1.02
1.8
MHz
0.98 to
1.02
2.
2
MHz
0.97
to
1.03
2.8
MHz
0.97
to 1.03
3.2
MHz
0.95
to
1.05
9.8
MHz
0.95
to
1.05
'-.
5-10.
INPUT
IMPEDANCE
CHECK.
5-11.
RESISTANCE CHECK.
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 in-
dication on
Model 3400A.
TEST OSCILLATOR
•
652A
hpZAQOA
RMS VOLTMETER
500
FEED-THRU
TERMINATION
/ipllOISB
—
boCZDco-
J
/
Figure 5-2.
Frequency Response
Test Setup
5-2