HP 3400A Service Manual

Maintenance
Model
3400A
5-26. High Frequency Calibration
5-27.
Amplifier
Gain
Adjustment.
Do
the
following:
NOTE
The
Test
Oscillator
should
be
calibrated
at
the
end
of
its
output
cable
with
50
ohms
termination
connected
at
the
end
of
the
cable.
a.
Connect
the
test
setup
shown
in
Figure
5-2.
b.
Set
the
-hp-
Model
3400A
RANGE
switch
and
Test
Oscillator
output
attenuator
to
the
.001
volt
position.
c.
Set
the
Test
Oscillator
for
a
400
Hz
output
and
adjust
its
amplitude
for
a
90%
full
scale
reading
on
the
3400A.
d.
Change
the
Test
Oscillator
frequency
to
10
MHz.
e.
Adjust
C405
(10
MHz
ADJUST)
on
the
A4
Assembly
for
a
90%
full
scale
reading
on
the
3400A.
Replace
the
right
side
cover.
If
the
reading
changes
after
cover
replacement,
readjust
C405
f.
Vary
the
oscillator
frequency
between
3
and
10
MHz.
If
the
3400A
reading
goes
above
95%
or
below
85%
of
full
scale,
repeat
step
e
until
optimum
response
is
obtained
between
3
and
10
MHz.
5-28.
Input
Attenuator
Adjustment.
Do
the
following:
NOTE
~
The
Test
Oscillator
used
in
this
procedure
should
be
calibrated
at
the
end
of
its
output
cable.
a. Connect the test setup shown in Figure 5-2.
b.
Set
the
-hp-
Model
3400A
RANGE
switch
and
test
Oscillator
output
attenuator
to
the
1
volt
position.
c.
Set
the
Test
Oscillator
for
a
400
Hz
output
and
adjust
its
amplitude
for
a
90%
full
scale
reading
on
the
3400A.
t
d. Change the Test Oscillator frequency to 100 kHz.
e.
Remove
the
bottom
cover.
Adjust
C102
(1
V,
100
kHz
ADJUST)
for
a
90%
full
scale
reading
on
the
3400A.
f.
Vary
the
oscillator
frequency
between
100
kHz
and
10
MHz.
If
the
3400A
reading
varies
more
than
+1%
from
100
kHz
to
1
MHz,
+2%
from,
1
MHz
to
2
MHz,
+3%
from
2
MHz
to
3MHz,
or
+5%
from
3
MHz
to
10
MHz,
readjust
C102
until
optimum
response
is obtained.
5-10

HP 3400A Specifications

General

Brand	HP
Model	3400A
Category	Measuring Instruments
Language	English