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Operating
Instructions
Model
1920
E.
For
specified
accuracy
(pulse
widths
,lOns,
peak voltage
(1.5
x full
scale)
Figure
2-1
shows
the
allowable
input
signal
vs.
crest
factor.
The figure
illustrates
that
for
a
crest
factor
of
three
the displayed
reading
must
be less
than
100,000
counts
(1V on
the
2V range).
So long
as the
maximum
input
is
not
exceeded
no
damage will
result
in
crest
factors
exceeding
that
shown
in
Figure2-I,
but
accuracy
will
slowly
degrade
(For
CF >3 but<10
typical
accuracy
is
degraded
by
(CF-3)
x 0.36%
arti
peak
signal
must
be
less
than
5 x full
scale
for
that
range).
CF
I
I
0
100000
200000
Displayed
Counts
Figure
2-l.
Crest
Factor
VS. Displayed
Counts
2-4.
Operating
Instructions
for
the
Model
lY20
installed
in
the
Model
192 are
as
follows:
2-5.
With
the
Model
1920
option,
the
Model
192
reads
AC voltages
from
1 microvolt/digit
to 1ooov.
The instrument
displays
the
True
Koot
Mean Square
(TKMS) value
of
an AC voltage
signal.
2-G.
The maximum
reading
is
199999.
Overrange
is
indicated
by OFLO.
Maximum
allowable
input
is
1OOOV Peak AC f DC; 2 x 107V.Hz.
Use the
Model
192
to measure
AC or AC + DC
voltages
as follows:
CAUTION
Do not
exceed
maximum
allowable
input
voltage.
Instrument
darnage may
occur.
A.
TURN POWER UN with
UN/OFF pushbutton.
B.
Press
the
ACV button
once
to
select
the
ACV (TKMS)
function.
Press
the
ACV button
ayain
and the
192 will
measure
the
T'KMS value
of
an AC + UC signal
(AC signal
superimposed
with
a DC
level).
The ACV and DCV LEDs will
light
simultaneously
when
the
AC + UC function
is
enabled.
Pressing
the
ACV button
again
will
return
the
192 to
the
ACV function.
Pressiny
the
DC button
while
in
AC t
DC returns
the
192
the
DCV
function.
2-2
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