Fluke 8012A - 4-54. RMS Converter DC Offset Adjustment; 4-56. AC Calibration Adjustment; 4-58. LO RANGE Ω Calibration Adjustment (8012 A Only)

SPECIFICATIONS
Specifications
FUNCTION
RANGE RESOLUTION ACCURACY*
50 Hz-60
Hz 45 Hz-5
kHz
5
kHz-20
kHz**
V
T
400.0
mV 0.1 mV
±(0.7%
+
4)
±(1.0%
+
4)
±(2.0%
+
4)
4.000V
0.001V
±(0.7%
+
2)
±(1.0%
+
4)
±(2.0%
+
4)
40.00V 0.01V
±(0.7%
+
2)
±(1.0%
+
4)
±(2.0%
+
4)
400.0V 0.1V
±(0.7%
+
2)
±(1.0%
+
4)
±(2.0%
+
4)
1000V
1V
±(0.7%
+
2)
±(1.0%
+
4)**
Unspecified
*
Accuracy is given as
+/-([%
of
reading] + [number ofleast significant digits])
at 1
8"
Cto
28°
C,
with relative humidity up to
90%,
foraperiod
of
one
year
after calibration, in the 4 1/2-digit mode,
multiply the number
of
least significant digits
(counts) by
10. AC
conversions
are
ac-coupled, true rms responding,
calibrated
to
the rms value of a sine
wave
input, and valid from 5% to 100%
of
range.
AC
crest
factor
can
be up to
3 at
full scale, 6 at half scale.
For non-sinusoidal wave forms add
-(2%
Rdg + 2% Fs)
typical,
for a crest
factor
up
to
3.
**
Below 10%
of
range,
add 16
counts.
f
The
Fluke
87
is
a
True-RMS responding
meter.
The
meter will display a reading (typically < 25
digits)
when
the
input leads
are
shorted
together
in the
A
C functions which is
caused
by
internal amplifier noise. The accuracy of the Fluke 87 is not significantly affected
by this
internal
offset
when
measuring inputs that are within 5%
to
100% of
the selected range. When the RMS value of
the
two values
(5%
of
range and
internal offset) is calculated,
the effect is
minimal
as
shown in
the
following example where 20. 0=5% of 400 mVrange, and
2.5 is the
internal
offset:
RMS
=
SQRT[(20.0)
2
+
(2.5)
2
]
=
20. 16
Ifyou use
the REL function
to zero
the display when using the
AC
functions, a
constant
error that
is equal
to
the internal offset
will
result.
34