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3PERATING
INSTRUCTIONS
lNSTRUCTlON
MANUAL
Digital Mullimeler
Models
172,
173
NOTE
The Model
1728
is
shipped
from
the
factory
in
uncharged
condition.
Therefore
the
Model
1728 should
be
installed
and charged
prior
to
use.
After
the
Model
1728 has
been
charged
for
at
least
16 hours,
for
at
least
6 hours.
the
Model
172/173
can
be powered
continuously
TABLE
3-2.
Summary
of
Ooeration
in
LINE
and
BAT Modes
Condition
of
Instrument
Line
Power
Connected
Line
Power
Connected
Line
Power
Not Connected
Button
Depressed
1728
not
installed
1728
installed
1728
installed
LINE
ON
ON
OFF
Battery
trickle
charged.
BAT
OFF
ON
ON
Batteryslowly
discharged.
NE I THER
OFF
OFF
OFF
LINE
NOR BAT
Battery
charged
at
max-
I
imum rate.
3-3.
HOW TO SELECT FUNCTION.
V/A,
Function
is
selected
by means
of
four
pushbuttons
AC, DC,
and R
d.
DC.
This
pushbutton
must
be used
with
V/A to
select
either
DC voltage
or
DC cur-
rent
fu#lct
ions.
1.
DC Voltage.
Depress
DC
Release
V/A
2.
DC Current.
Depress
DC
Uepress
V/A
b.
AC.
This
pushbutton
must
be used
with
V/A to
select
either
AC voltage
or AC cur-
rent
fe Ict ions.
I.
AC Voltage.
Depress
AC
Release
V/A
2.
AC Current.
Depress
AC
Depress
V/A
t.
V/A.
This
pushbutton
selects
either
voltage
V or
current
A.
When
V/A
is
depressed,
along
with
DC or
AC, a shunt
resistor
is
connected
across
the
HI and
LO terminals
to
pro-
vide
current
sensing.
d.
{I.
Depress0
to measure
resistance.
NOTE
DC. AC,
and Sl pushbuttons
are
interlocked
so that
only
one
pushbutton
is
depressed
at
a time.
However,
it
is
possible
to have
all
pushbuttons
out
which
disconnects
the
input
HI and
LO terminals
and no measurement
can
be made.
(The
R indicator
will
be
lighted
in
this
instance.)
AA
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