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THEORY
OF OPERATION
SWI-CH
V
A
n
2 WI RE/4 WI RE"*
2
WIRE/4
WIRE""
INSTRUCTION
MANUAL
DigitsI Mullimet*r
Modela
172A. 173A
TABLE 5-l.
(CONIT)
Summary of
Pushbutton
Switching
STYLE
"Interlock
*Interlock
Push-Push
Push-Push
Push-Push
Push-Push
Push-Push
Push-Push
SETTING
In
In
In
In
out
In
Out
In
Out
REMARKS
DMM is
set
to
V mode.
Overriaes
A and R
functions
due
to
interlocked
pushbuttons.
DMM~is set
to A mode.
Overrides
V and 5
functions
due to
interlocked
pushbuttons.
DMM is
set
to n mode.
Overrides
V and A
functions
due
to
interlocked
pushbuttons,
also
overrides
DC/AC switch.
:':NOTE
If
V, A, and R pushbuttons
are
OUT simultan-
eously,
no function
will
be selected,
the
input
terminals
will
be open-circuited,
and
the
DMM will
display
V.
The displayed
read-
ing
is meaningless.
DMM is
set
to measure
AC (either
V or A).
Not
functional
when
set
to R.
DMM ib set
to measure
DC (either
V or A).
DMM is
set
to
low ohms function.
DMM is
set
to high
ohms function.
DMM is
set
for
4-WIRE
ohms measurements.
Upper
pair
of
terminals
are
used
for
Volt-
age sensing.
Lower
pair
of
terminals
are
used
for
ohms source.
Lower
pair
of
terminals
are
useable
only
in 4-WIRE
3 mode
and are
open
circuited
for
all
other
conditions.
DMil is
set
for
conventional
2-WIRE
ohms
measurements.
Upper
pair
of
terminals
must
be used.
Lower
pair
of
terminals
are
open-
circuited.
Only
functional
when
set
to R.
5-4
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