Specifications, Specification for clamp meter/coil interaction, Calculating total specification – Fluke 5500A User Manual
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Specifications
Number of Turns
50
Maximum Current
11A rms, continuous
20.5A rms, 2 minutes
Maximum Duty Cycle Derating
< 11A, continuous
> 11A, 2 minutes ON, 8 minutes OFF
Maximum Voltage
7 V dc or 7 V rms ac
Minimum Inner Diameter of Clamp Jaws
2.54 cm [1”]
Specification for Clamp Meter/Coil interaction
Specification for 5500A/COIL
Coil Specifications [clamp/coil interaction]
Calibrator Output
Effective
Current Output
Toroidal-type Clamps
[such as the Fluke 80i-600 and 80I-1000]
'other-type' of Clamps
[such as the Fluke 80i-KW, -400,
80i-410, -500, -1010 and 30-series]
Magnitude
Frequency
Amp-turns
±(% of output + Amps)
±(% of output + Amps)
0.2 - 0.33 A
DC
10 - 16.4999
0.50
0.02
0.33 - 2.9999 A
DC
16.5 - 149.999
0.5
0.14
3.0 - 20.5 A
DC
150 - 1025
Not applicable
0.5 0.5
0.2 - 0.33 A
45 Hz to 65 Hz
10 - 16.4999
0.28
0.003
0.56
0.03
0.33 - 2.9999 A
45 Hz to 65 Hz
16.5 - 149.999
0.28
0.025 0.56 0.25
3.0 - 20.5 A
45 Hz to 65 Hz
150 - 1025
0.28
0.09
0.56
0.9
0.2 - 0.33 A
65 Hz to 440 Hz
10 - 16.4999
0.79
0.003
1.00
0.03
0.33 - 2.9999 A
65 Hz to 440 Hz
16.5 - 149.999
0.79
0.027 1.00 0.25
3.0 - 20.5
**
A
65 Hz to 440 Hz
150 - 1025
0.79 0.1
1.00
0.9
0.2 - 20.5 A
Above 440 Hz
10 - 1025
Usable but unspecified
**Note: Some calibrators may not have adequate compliance voltage to drive coil in this range.
Calculating Total Specification
The total specification of the effective current that the clamp-type meter measures is a function of the
clamp/coil interaction and of the current calibrator. To determine the total specification use the following
formula:
source
2
coil
2
total
U
S
S
+
=
Example:
Assume we are driving the coil with the Fluke 5500A at 4A, 60 Hz (the clamp meter will see an effective
current of 200A, 60 Hz) and we are calibrating a toroidal-type clamp meter. The Calibrator’s 1 year
specification at 4 Amps is
± (0.06% + 2 mA), so the effective current in the coil bundle will have a speci-
fication of
± (0.06% + 0.1A). Next, we find the total specification of the calibrator and the coil as a per-
centage of the output:
Specification of effective calibrator current in coil bundle =
± (0.06% + 0.1A) = 0.11%
Specification due to clamp Meter/Coil Interaction =
± (0.28% + 0.09A) = 0.325%
The RSS of these two specifications determines the total specification of the clamp/source combination:
%
343
.
0
%
11
.
0
%
325
.
0
2
2
total
=
+
=
S