Yokogawa 30032A 1mA/60A Leakage Current Clamp-On meters

Harmonic Filter Function (Available in the 30032A)

1. What is a Harmonic?

Harmonic refers to sinusoidal quantity having a frequency that is an integral multiple of the fundamental frequency (for example, the commercial frequency). When a harmonic is superimposed on the fundamental frequency, the waveform is distorted.
2. Why is it Necessary to Accurately Measure the Leakage Current of the Fundamental Frequency (Commercial Frequency)?

One problem when measuring the leakage current to check the isolation of electrical circuits in power distribution equipment is that the electrical isolation cannot be correctly understood due to the influence of a harmonic current. That is, the leakage current flowing from the electrical circuit to ground is very small so that, in order to check the isolation of electrical circuits by means of the leakage current, it is necessary to remove the harmonic component of the leak current and measure only the current of the fundamental frequency (commercial frequency).
3. The 30032A Employs a Harmonic Filter

Conventional leakage clamp-on testers could not sufficiently remove harmonic current components so measured leakage current values were often larger than the specified value due to the influence of a harmonic current. In this case, retesting with an insulation tester was required, resulting in increased effort and cost for the test. Under these circumstances, Yokogawa Meters & Instruments Corporation has developed the leakage clamp-on tester 30032A, which employs a high-performance harmonic filter that can accurately measure just the fundamental frequency component of the leakage current.

Specifications

Yokogawa 30032A General Specifications
Method of Detection	Mean Value
Diameter of Measurable conductor	±40MM at maximum
Display	LCD	Digital Display: 3200 Counts
		Bar-graph Display: 32 Segments
		“OL” over-range indication  Low-battery symbol  Data hold symbol
Measurement Cycle	Digital Display: 2 times/Seconds
	Bar-Graph Display: 12 times/second
Range Switching	Auto-Range
Data Hold	On All range
Ambient Temperature and Humidity	0-50°C, 85% RH or less (no condensation)
Temperature coefficient	0.05% of range/°C or less (within the ranges of 0-18°C and 25-50°C for measurement of 0-50A)
Influence of external Magnetic Field	0.0005% typical*1 (on current value of adjacent cable)
Influence of Conductor Position	Within Accuracy
Circuit Voltage	300Vrms or less
Withstanding Voltage	3.7kV AC for one minute
Power Supply	CR2032 (coin-shaped) 3V x1
Battery Life	Approx. 90 hours (continuous use)
Auto Power-off	Approx. 10 Minutes
Dimensions	Approx. 70(W)x176(H)x25(D)mm
Weight	Approx. 200g

AC current measurement
Filter function OFF
Accuracy: ± (% of reading + digits)
Range	Resolution	Accuracy	Maximum Allowable Current
3mA	0.001mA	0.010 < I ≤32.70mA: 1.0%+5	3.270mA
30mA	0.01mA		32.70mA
30A	0.01A	0.05 < I ≤50.0A:1.0%+5 50.0 < I ≤60.6A:5.0%+5	32.70A
60A	0.1A		60.6A
Filter function ON
3mA	0.001mA	0.010 < I ≤32.70mA: 1.5%+5	3.270mA
30mA	0.01mA		32.70mA
30A	0.01A	0.05 < I ≤50.0A:1.5%+5 50.0 < I ≤60.6A:5.5%+5	32.70A
60A	0.1A		60.6A
Note: Input current of 2nd-order and higher harmonics : 150 mA rms maximum in the 3 mA/30 mA range : 62 A rms maximum in the 30 A/60 A range Filter specifications (3 mA and 30 mA ranges and 30 A and 60 A ranges) Amplitude ratio at 100 Hz: -38 dB (1.26%) or less (typical: -41 dB) Amplitude ratio at 120 Hz: -53 dB (0.22%) or less (typical: -56 dB) Zero correction 3 mA range: Displays 0.000 mA (zero) when 0.010 mA < I 30 A range: Displays 0.00 A (zero) when 0.05 A < I