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Page Title:
Table 3-1. Controls and Indicators-continued |
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  TM 11-6625-444-14-1
Table 3-1. Controls and I n d i c a t o r s C o n t i n u e d
Control, indicator,
Ref.
Function
No.
or connector
5
FUNCTION
switches
Select
the
desired
operating
mode:
RATIO.................................................................
Places
voltmeter
in
ratio
mode
with
full-scale
ranges of 10, 100, and 1,000.
FILT.....................................................................
Controls
4-pole
active
input
filter
to
provide
desired
noise
rejection.
Functional
for
dc
voltage,
voltage,
ac
and
resistance
measurements.
VDC..................................................................
Places voltmeter in dc voltage mode with full-
scale ranges of 10, 100, and 1,000.
VAC....................................................................
Places
voltmeter
in
ac
voltage
mode
with
full-
scale ranges of 10, 100, and 1,000.
REMOTE............................................................
Places
voltmeter
in
remote
mode,
enabling
function
and
range
to
decontrolled
remotely
via the remote control unit.
Adjust
for
.00000±1
with
VDC,
filter
and
10
range
called
and
INPUT
ter-
minals shorted.
7
INPUT
terminals
HI,
LO
input
connections
fordcand
ac
voltage
measurements.
8
Connects
to
internal
guard
chassis.
When
properly
connected
externally,
GUARD
terminals
provides
maximum
common
mode
rejection.
10
Adjusted
for
minimum
readout
with
VDC,
FILT,
RATIO,
and
10
buttons
RATIO
FULL
SCALE
control
depressed
andequal
voltage
applied
toEXT
REFand
INPUT
terminals.
10
Places
voltmeter
in
autorange
mode,
providing
automatic
ranging
for
each
AUTO
RANGE
switch
function
and
its
range
complement.
11
Enable
manual
selection
of
range.
Not
calling
a
range
or
incorrect
range
Manual
RANGE
selection
automatically
places
voltmeter
in
autorange
mode.
12
SAMPLE
RATE
control
Permits
variation
of
sample
rate
from
2
readings
per
second
to
1
reading
per
4.5
seconds.
In
Exposition
(fully
counterclockwise),
sample
rate
control
is
transferred
to
remote
control
point
via
the
data
output
unit.
If
the
data
output option is not installed and the control is turned to EXT, the volt-
meter will readout and display from its internal storage circuitry indefinitely,
with
readout
corresponding
to
value
of
last
measurement
sample.
Provides
connections
for
rear
input.
Rear
INPUT
terminals
EXTERNAL
REFERENCE
ratio
ter-
Provides
connections
for
±
external
reference
voltage
input
for
dc
voltage
ratio
measurements.
minals
Provides
access
to
data
drive
signals.
15
Data
output
connector
16
Selects either 115 or 230volt ac line operation.
115/230
volt
input
power
switch
Line FUSE
Protects
voltmeter
from
overloads.
Fuse
rating
is
AGC
½
ampere.
17
18
Mates
with
polarized
3-wire
power
cord
for
connection
to
115/230
volt,
50
Hz
AC
line
voltage
connecter
to 400 Hz, single phase, ac line.
Guard
terminals
Connects
to
each
other
and
to
internal
guard
chassis.
When
properly
connected
externally,
provides
maximum
common
mode
rejection.
3-3
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