Three-phase Reference Standard Meter CL3112D

The three-phase reference standard meter is made according to the R46 standard published by the OIML (International Organization of Legal Metrology), which is high precision, multifunctional and high performance.
It is used for tests and calibrations of gateway energy meters and high-level calibrators.

Reference Standard Meter CL3112D, front view

Reference Standard Meter CL3112D, rear view

Function

Tests of voltage, current, power, phase angle, power factor and frequency
Tests of the distortion of each phase voltage and current, and measure and analyze the 2^nd – 64^th harmonics
Tests of the peaked waveform, quadriform waveform, sub-harmonics, high-order harmonics and other waveforms specified in R46.
Test of fundamental active power / electric energy, total harmonic active power / electric energy and full wave
Tests of the stability and asymmetry of each electric quantity
7-inch color touch screen

Specification

Item	Parameter
Test voltage, phase-neutral	30 V – 720 V
Voltage ranges	60 V, 120 V, 240 V, 480 V, 720 V
Harmonics accuracy, voltage	Order: 2^nd – 20^th, ±0.2 % reading + ±0.05 % range Order: 21^st – 64^th, ±0.3 % reading + ±0.05 % range
Test current	1 mA – 120 A
Current ranges	10 mA, 20 mA, 50 mA, 0.1 A, 0.2 A, 0.5 A, 1 A, 2 A, 5 A, 10 A, 20 A, 50 A, 100 A
Current accuracy	1 mA – 25 mA: 240 ppm reading + 160 ppm range 25 mA – 100 A: 120 ppm reading + 80 ppm range
Harmonics accuracy, current	Order: 2^nd – 20^th, ± 0.2 % reading + ± 0.05 % range Order: 21^st – 64^th, ± 0.3 % reading+ ± 0.05 % range
Harmonics accuracy, power	Order: 2^nd – 20^th, ± 0.2 % reading + ± 0.1 % range
Phase shift	±180°
Phase shift accuracy	±0.02°
Frequency range	45 Hz – 65 Hz
Frequency accuracy	0.01 Hz
Power factor range	-1 … 0 … +1
Power factor accuracy	5 ppm
Impulse input	0 -100 kHz
Impulse output	0 – 50 kHz
Operating power supply	AC 220 V ±10 %, 45 Hz – 65 Hz
Power consumption	< 30 VA
Operating temperature	23 °C ±10 °C
Storage temperature	-5 °C – 50 °C
Voltage measurement accuracy	< 0.01 %
Voltage measurement drift	< 25 ppm/year
Current measurement accuracy, 1 mA…25 mA	≤ 0.1 %
Current measurement accuracy, ≥ 25 mA	< 0.01 %
Current measurement drift	< 55 ppm/year
Power measurement accuracy P, Q, S	< 0.02 % (current ≥ 25 mA and λ = 1)
Power measurement drift	< 80 ppm/year
Phase angle accuracy	< 0.01° (current ≥ 25 mA and voltage > 30 V)
Phase angle resolution	0.0001°
Frequency accuracy	0.01 Hz
Frequency resolution	0.0001 Hz
Voltage temperature drift	< 2.5 ppm/K
Current temperature drift	< 5 ppm/K
Power temperature drift	< 7.5 ppm/K
Preheating time	15 minutes
Surge voltage protection	Class C
Installation category	CATIII
Pollution degree	2
Relative humidity	≤ 85 % RH, not condensate
Dimensions (W x H x D)	500 mm × 133 mm × 485 mm
Weight	Approx. 19 kg

Meter Constant Table

CL3112D power constants
	60 V	120 V	240 V	480 V	600 V
0.01 A	1.8 x 10⁹	1.8 x 10⁹	1.8 x 10⁹	1.8 x 10⁹	1.8 x 10⁹
0.02 A	1.8 x 10⁹	1.8 x 10⁹	1.8 x 10⁹	1.8 x 10⁹	1.8 x 10⁹
0.05 A	1.8 x 10⁹	1.8 x 10⁹	1.8 x 10⁹	1.8 x 10⁹	1.8 x 10⁹
0.1 A	1.8 x 10⁹	1.8 x 10⁹	1.8 x 10⁹	1.25 x 10⁹	1.0 x 10⁹
0.2 A	1.8 x 10⁹	1.8 x 10⁹	1.25x 10⁹	6.25 x 10⁸	5.0 x 10⁹
0.5 A	1.8 x 10⁹	1.0 x 10⁹	5.0 x 10⁸	2.5 x 10⁸	2.0 x 10⁸
1 A	1.0 x 10⁹	5.0 x 10⁸	2.5 x 10⁸	1.25 x 10⁸	1.0 x 10⁸
2 A	5.0 x 10⁸	2.5 x 10⁸	1.25 x 10⁸	6.25 x 10⁷	5.0 x 10⁷
5 A	2.0 x 10⁸	1.0 x 10⁸	5.0 x 10⁷	2.5 x 10⁷	2.0 x 10⁷
10 A	1.0 x 10⁸	5.0 x 10⁷	2.5 x 10⁷	1.25 x 10⁷	1.0 x 10⁷
20 A	5.0 x 10⁷	2.5 x 10⁷	1.25 x 10⁷	6.25 x 10⁶	5.0 x 10⁶
50 A	2.0 x 10⁷	1.0 x 10⁷	5.0 x 10⁶	2.5 x 10⁶	2.0 x 10⁶
100 A	1.0 x 10⁷	5.0 x 10⁶	2.5 x 10⁶	1.25 x 10⁶	1.0 x 10⁶

The table refers to the automatic settings. It’s valid for 3 wire- and 4 wire measuring mode.

The output frequency for end of range in voltage/current pair with three phase connection is 50 kHz. The power pulses are on TTL/CMOS level. The burden capacity is > 20 mA.

Calculation formulas

Frequency

Constant

The meter constants can be set in the settings menu or selected automatic. Setting range is 1 i/kWh to 2 x 10⁹ i/kWh.

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Editor's note: This article was originally published in July 2022 and has been updated for comprehensiveness.

THREE-PHASE REFERENCE STANDARD METER CL3112D