Three Phase Reference Standard CL3115

reference standard CL3115-HW
reference standard CL3115

This reference standard has accuracy class 0.02 related to apparent power
It can be used for

  • voltage measurement
  • current measurement
  • phase angle measurement
  • frequency measurement
  • harmonics analysis up to the 63th
  • power measurement, active-, reactive-, apparent
  • self consumption measurements
  • accuracy error calculations stand-alone with one pulse input socket, or together with error calculators in stationary test benches
  • register tests


Specifications Reference Standard CL3115-HW, Mains connection
Item Values
Voltage 85 V … 265 V AC
Frequency 45 Hz … 65 Hz
Power consumption < 30 VA
Preheating time 15 minutes
Operating temperature 5 °C … 45 °C
Max. relative humidity ≤ 85 %, not condensate
Surge voltage protection class C
Installation category III
Pollution degree 2
Weight approx. 13 kg
Dimensions 19” 3 units,
H x W x D: 132,5 mm x 483 mm x 405 mm
Specifications Reference Standard CL3115-HW, measurement values
Item Values
Test voltage, phase-neutral 30 V … 576 V
Voltage ranges 60 V, 120 V, 240 V, 480 V, auto 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, auto range
Frequency range, fundamental wave 40 Hz … 70 Hz
Bandwidth 4 kHz
Voltage measurement accuracy < 0.01 %
Voltage measurement drift < 35 ppm / year
Current measurement accuracy < 25 mA < 0.02 %
Current measurement accuracy ≥ 25 mA < 0.01 %
Current measurement drift < 65 ppm / year
Power measurement accuracy P, Q, S < 0.02 % (current ≥ 25 mA and λ = 1)
Power measurement drift < 100 ppm / year
Phase angle < 0.01° (current ≥ 25 mA and voltage > 30 V)
Frequency 0.005 Hz
Voltage temperature drift < 2,5 ppm / K
Current temperature drift < 5 ppm / K
Power temperature drift < 7.5 ppm / K
Errors are independent of measurement mode and when using auto range. The reference standard provides a power proportional frequency output (160 kHz nominal).


The equipment can be operated manually with menu keys or via RS485 remote control. A interface description for integration into 3rd party meter test equipment is available on request. Below are some screen-shots



The recalibration period is defined by national rules or by company policy. Typically it’s one or two years. The reference standard can be calibrated by any recognized body or metrological institute. Please note that there is a difference between recalibration and readjustment. An adjustment becomes necessary once the reference standard accuracy is out of the specified class. The adjustment can be done locally. There is no need to sent the instrument back to us.

The reference standard CL3115 is by default delivered with a company calibration certificate. It can also be delivered with a calibration certificate issued by an ILAC accredited laboratory on additional cost.

Following measurement modes are supported by the reference standard CL3115:

  • Three-phase four-wire system, active/ reactive true/apparent
  • Three-phase three-wire system, active/ reactive true/ apparent
  • Single-phase system, active/ reactive true/ apparent
  • Three elements cross connected 90° (Q390)
  • Two elements cross connected 90° (Q290)
  • Two elements cross connected 60° (Q260)

A frequency proportional to the total power is generated by a signal processor, which applies to the pulse output fOUT of the CL3115. The energy output pulse constant can be set to automatic mode or manual mode. Setting range is: 1…2,000,000,000 i/kWh. The pulse output frequency is 160 kHz for End of range in voltage and current. The energy pulse is on TTL/CMOS level, burden capacity >20 mA. The range can be selected in Auto-mode or direct assigned.
Calculation formula for the output frequency


Calculation formula for the meter constant

UR and IR are the ranges, the frequency is 160 kHz


CL3115 meter constants
3 wire and 4 wire mode













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Published by

Lao Ren

more than 30 years experience in energy metering Product Director Shenzhen CLOU Electronics

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