Fluke 87V-MAX Product Manual - Page 43

Specifications - true rms

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87 Users Manual Specifications Function Range Resolution Accuracy* 50 Hz - 60 Hz 45 Hz - 1 kHz 1 kHz - 5 kHz 5 kHz - 20 kHz*** B 400.0 mV 0.1 mV ±(0.7% + 4) ±(1.0% + 4) ±(2.0% + 4) ±(2.0% + 20) V † 4.000V 0.001V ±(0.7% + 2) ±(1.0% + 4) ±(2.0% + 4) ±(2.0% + 20) 40.00V 0.01V ±(0.7% + 2) ±(1.0% + 4) ±(2.0% + 4) ±(2.0% + 20) 400.0V 0.1V ±(0.7% + 2) ±(1.0% + 4) ±(2.0% + 4)‡ unspecified 1000v 1V ±(0.7% + 2) ±(1.0% + 4)** unspecified unspecified * Accuracy is given as ±([% of reading] + [number] + [number of lease significant digits]) at 18°C to 28°C, with relative humidity up to 90%, for a period of one year after calibration. In the 4 ½-digit mode, multiply the number of lease 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. *** Below 10% of range, add 6 digits. † The Fluke 87 is a True-RMS responding meter. The meter will display a reading (typically

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87
Users Manual
36
Specifications
Function
Range
Resolution
Accuracy*
50 Hz - 60 Hz
45 Hz - 1 kHz
1 kHz - 5 kHz
5 kHz - 20 kHz***
B
V †
400.0 mV
4.000V
40.00V
400.0V
1000v
0.1 mV
0.001V
0.01V
0.1V
1V
±
(0.7% + 4)
±
(0.7% + 2)
±
(0.7% + 2)
±
(0.7% + 2)
±
(0.7% + 2)
±
(1.0% + 4)
±
(1.0% + 4)
±
(1.0% + 4)
±
(1.0% + 4)
±
(1.0% + 4)**
±
(2.0% + 4)
±
(2.0% + 4)
±
(2.0% + 4)
±
(2.0% + 4)‡
unspecified
±
(2.0% + 20)
±
(2.0% + 20)
±
(2.0% + 20)
unspecified
unspecified
*
Accuracy is given as
±
([% of reading] + [number] + [number of lease significant digits]) at 18°C to 28°C, with relative
humidity up to 90%, for a period of one year after calibration. In the 4 ½-digit mode, multiply the number of lease
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.
*** Below 10% of range, add 6 digits.
†
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 AC functions which is caused by internal amplifier noise. The accuracy on 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 mV range, and 2.5 is the internal offset.
RMS = SQRT[(20.0)
2
+ (2.5)
2
] = 20.16
If you 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.
‡
Frequency range: 1 kHz to 2.5 kHz.
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