Controls And Indicators - HP 3400A Operating And Service Manual

Section
III
Model 3400A
'
1.
Direct reading meter: dc
meter which
indicates
rms
voltage level
of
input signal.
2.
Mechanical zero
adjustment:
screwdriver
adjustment
for
zero
of direct
reading meter.
3.
LINE
ON
pilot
lamp:
neon
lamp which
indicates
when power
is
applied
to
instrument
and
power
switch
is
ON.
4.
Power
switch:
two-position toggle switch
which
applies 115- or 230- volts
ac
to
instrument.
5.
RANGE
switch:
12-position rotary switch
which
selects
various attenuation
ranges
available within
Model
3400A.
6.
INPUT
connector:
BNC
jack which enables
application
of
input signal
to
instruments
measuring
circuits.
7.
115/230-
volt
switch:
two-position
slide
switch
which
sets
instrument
to
operate
from
either
a 115- or 230-volt ac source.
8.
Input
power
jack:
three-prong jack
which
enables application of line
voltage
to
instru-
ments power
supply circuits.
9.
115V/230V
.
25A FUSE:
0.
25
ampere
fuse
which provides protection against line voltage
surges.
10.
DC OUT
jack:
telephone-type
jackwhich pro-
vides negative 1-volt
dc
out at full
scale de-
flection,
output
is
proportional
to
meter
de-
flection.
Output
impedance
is
1000
ohms.
A
telephone type plug for the
DC OUT
jack
may
be purchased under
-hp- Part No. 1251-0067.
I
Figure
3-1.
Model 3400A Controls and Indicators
t
3-0