FLIR
CM72_CM74
USER
MANUAL
Document
Identifier:
CM72_CM74
‐
en
‐
US_AA
23
7.2
Electrical
specifications
Accuracy
is
±
(%
reading
+
number
of
digits
(dgt))
at
73.4
°
F
±9
°
F
(23
°
C
±5
°
C),
<80%
RH.
Table
7.1
Voltage
(TRMS)
Function
Range
Accuracy
(of
reading)
DCV
60.00
V
±
(1.0%
+
5
dgt)
600.0
V
1000
V
(CM74)
ACV
60.00
V
±
(1.0%
+
5
dgt)
45~400
Hz
600.0
V
(CM72)
1000
V
(CM74)
ACV
VFD
(CM74
only)
60.00
V
±
(1%
+
5
dgt)
45~65
Hz
±
(5%
+
5
dgt)
65~400Hz
600.0
V
1000
V
Lo
Z
(Low
Impedance)
60.0V
AC/DC
AC:
±
(1.0%
+
5
dgt)
45~400
Hz
DC:
±
(1.0%
+
5
dgt)
600.0V
AC/DC
(CM72)
1000V
AC/DC
(CM74)
Notes:
LCD
Displays
‘0’
counts
when
the
AC
reading
is
<10
counts
CM72
Overload
protection:
600
V
(rms)
CM74
Overload
protection:
1000V
(rms)
Input
impedance:
10
M
Ω
//,
<100
pF
Lo
Z
Input
impedance:
2.5k
Ω
AC
conversion
type:
AC
coupled,
true
RMS
responding,
calibrated
to
the
RMS
value
of
a
sine
wave
input.
Accuracies
are
given
for
sine
waves
at
full
scale
and
non
‐
sine
waves
below
half
scale.
If
the
meter
measures
a
4000
‐
count
signal
and
the
Crest
Factor
of
the
signal
is
more
then
3.0,
the
reading
may
not
meet
specified
tolerances.
For
non
‐
sine
waves
(50/60
Hz),
add
the
following
Crest
Factor
corrections:
For
a
crest
factor
of
1.0–2.0,
add
3.0%
to
the
accuracy.
For
a
crest
factor
of
2.0–2.5,
add
5.0%
to
the
accuracy.
For
a
crest
factor
of
2.5–3.0,
add
7.0%
to
the
accuracy.
