Heathkit IM-16 - Specifications; DC Voltmeter Specifications; AC Voltmeter Specifications; Ohmmeter Specifications

OPERATION
The
power
consumption
of
the
Solid-State
Volt-
meter
is
very low
and
there
is
no
objection
to
leaving
the
instrument
turned
on
continuously
during the daily
work
period
rather
thanturning
it
off each time
a measurement
function
is
completed,
when
operating
from a power
line.
However,
to
prevent
drain
on theohmmeterbat-
tery, do
not
leave the FUNCTION
switch
set in
the
OHMS
position
longer than
is necessary
to
make
resistance
measurements.
SAFETY
PRECAUTIONS
CAUTION:
It
is
good
practice
to
observe
certain
basic rules
of operatingprocedure
anytime
volt-
age
measurements
are to
be made. Always
handle
the testprobe
bythe insulatedhousing
onlyand
do
not
touch
the
exposed tip
portion.
When
high
voltage measurements
are
to
be made,
remove
operating
power
to the
unit
under test
before
connecting the test
leads, If this
is not
possible,
be careful
to
avoid
accidental
contact
with
nearby
objects whichcouldprovide
a
ground
return
path.
When working
on
high
voltage
cir-
cuits,
play
safe.
Keep
one
hand
inyourpocket
to
minimize
accidental
shock
hazard, andbe
sureto
stand
on
a
properly
insulated
floor
orfloorcov-
ering"
COMBINATION
PROBE
The
combination
AC-OHMS/DC
testprobe
elim-
inates two
of the
usual three
test
jack
installa-
tions
on
the Voltmeter
front
panel"
The
probe
switch
should
be
settoAC-OHMSfor
all AC
volt-
age
measurements,
and
resistance measure-
ments.
The
DC position
of
the probe
switch
is
used
only for
DC
voltage
measurements.
The
probe
can be
clipped
onto
anyleadinthe
circuit,
by installing
the alligator
clip
on
the threaded
probe
tip
as
shown in
Figure
3"
F
igure 4
READING
THE
METER
Figure
4 shows
the
scales
and markings
on
the
face
of
the
meter. Before making
any
voltage
or
resistance
measurements
with
your
Voltmeter,
be
sure
to
check
the
zero
position
ofthe
pointer
with
the
FUNCTION
switch at DC+
and DC-.
Turn
the
ZERO ADJUST
control, if necessary,
to zero
the
meter.
Resi
stonce
(C[rms]
Reodings
The
probe
switch must
be intheAC-OHMSposi,
tion,
and
the FUNCTION
switch at
OHMS,
when
making
resistanee
measurements"
Turn
the
OHMS ADJUST
control
until the
pointer
rests
over
the
last
green
mark
at the
right-hand
end
of
the
Ohms
scale.
Do
not
change the
setting
of
the
ZERO
ADJUST
control while
making
resist-
ance
measurements"
The
figures
on
the
green
Ohms scale
are multi-
plied
by 1,
10, 100,
etc,, accordingtothe
setting
of
the
OHMS
range
switch. When
this
switch is
in
the
RX100
position,
for example, a
readingof
6
would
indicate
600
ohms,
or
a
reading
of
50
would
indicate
5000 ohms.
The
RX
1K
position
indicates that
the meter
scale
should
be multiplied
by 1000
(K
=
1000).
RX
100K
would multiply
the
reading
by
100,000,
etc.
The
last
clockwise
position
of
the
OHMS
range
switch
is
marked
RX
1
meg.
Megohm
means
1,000,000
ohms,
so
the
meter reading
would
be
multiplied
by 1,000,000,
F igure
3