Fluke 5500A Specifications, Specification for Clamp Meter/Coil interaction, Example

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
								'other-type' of Clamps
				Current Output	Toroidal-type Clamps
								[such as the Fluke 80i-KW, -400,
					[such as the Fluke 80i-600 and 80I-1000]
								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	Not applicable			0.5	0.14
3.0	- 20.5 A	DC		150 - 1025				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:

Stotal = S 2 coil + U 2 source

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:

S total = 0.325% 2 + 0.11% 2 = 0.343%