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Model
1920
SECTION 2.
OPERATING
INSTRUCTIONS
Operating
Instructions
Z-l.
Operating
Instructions
for
the
rlcdel
1920
installed
in
the
ilodel
191 are
as
follows:
2-2.
Ilith
the
ilodel
1920
option,
the
ilcdel
191 reads
AC voltages
froln
10 r;licrovolts/digit
to
1000v.
The instrument
displays
the
True
Koot
llean
Square
(TKilS)
value
of
an AC
voltage.
It
has
a frequency
response
of 20Hz
to 100ktlz.
2-3.
The rnaximm
reading
is
199YYY.
Werrange
is
irdicatcd
by
(-)
l-----,
except
on
the
1000 volt
range.
The 700 volt
range
is
selected
idith
the
1000 volt
button.
On the
700 volt
range,
the display
can
read
beyond
the
rnaxiinuln
allobiable
input
voltage.
ilaximun
allobcable
input:
1OOOV Peak AC + DC; 2
x lo7
V'Hz.
Use the ilodel
191
to lneasure
AC
voltage
as follobis:
CAUTION
Do not
exceed
maximum
allohcable
input
voltage.
Instrument
damage
may
occur.
A.
Turn
the
pokier
on IJith
the UN/OFF
pushbutton,
ati
depress
the
ACV pushbutton.
8.
Select
the desired
range
from
the
4 ranges
available.
The decimal
point
is
positioned
by
the
range
pushbutton.
C.
Ensure
that
the
I0JLL pushbutton
is
out
(light
off)
unless
measurements
are
to be made
as deviations
from
a preset
value.
NOTE
Do not
use NULL to zero
the
range.
A small
residual
zero
readirq
is
normal.
If
NULL is
used
to zero
this
offset,
readings
in
specified
accuracy
range
will
be low
by
the
offset
amount.
This
is
because
rms
measurement
signals
add in
a root
mean square
fashion
arrl
not
linearly.
The NULL function
is
a linear
offset
axl
not
usable
in
TKllS
measurements.
0.
Connect
the
signal
to be measured
between
the
INPUT HI ati
LO binjiny
posts.
The
birding
posts
accept
wires,
spade
lugs
or banana
plugs
for
ease
of
connectiq
the
circuit
to be measured.
Observe
the displayed
digits
ard decimal
point.
2-1
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