Working standard WS

The Working Standard is a single-phase (WS 2120) and three-phase (WS 2320) precision reference meter for electrical power and energy measurement dedicated to on-site meter testing. The device can be used also as hand-held unit for local data exchange with smart meters (programming and data readout of meters).


  • Impulses scanning with the aid of universal optical scanner, with cable for SO output pulses and eventually by manual snap switch simulates pulses;
  • Current scanning by current sensors or current clamps;
  • Measured and cummulative results are dsiplayed on coloured LCD phase by phase. It is possible to display them in a form of phasor diagram at the same time or in the form of oscilloscopic waveforms;
  • Measured and calculated results are stored in high capacity flash memory;
  • The software and device menu are implemented in regional languages;
  • The portable printer for printing of measured results or actual content of display is an optional accessory;
  • The device is equipped with internal rechargeable accumulators.

Technical data

Basic Frequency Range 40 ... 70 Hz
Input Circuits 1-phase 2-wires (WS 2120 & WS 2320); 1-phase 3-wires and 2-phase (WS 2320);3-phase 3-wire / 4-wire (WS 2320)
Voltage Range 0,1 ... 600 V phase to neutral Manual orauto range
Current Range Depending on type of current sensor - up to 20 A / 120 A / 240 A / 6000 A or more
Power Factor Range -1 ... 0 ... 1
Phase Angle 0 ... 360°
Communication USB, RS-232 interfaces (SCPI protokol); optical interface for communication with meters according to IEC 62056-21(via OPTH 1200), optionally wireless (2,4 GHz)
Display 3,5” / 320 x 240 pixels / 256 colors
Memory for Data min 1GB (>1000 load points)
Operating Temperature -20 ... +50 °C
Storage Temperature -25 ... +60 °C
Operating Humidity max. 95% relative humidity (non-condensing)
Power Consumption approx. 1,5 W
Power Supply from int. rechargeable accumulators (4xNiMH, AA size); from Power Adapter (100 - 240 V AC / 12 V DC); from Car Outlet Adapter (12 V); from measured volt. circuit (46 - 520 V /45 - 65 Hz)
Applicable Standards IEC 60736, IEC 62056-21, IEC 61010-2-032
Degree of Protection IP-42 (basic device); IP-54 (device with connectors protective cover);
IP-67 (transport case)
Safety Requirements Isolation protection: EN 61010-1; Measurement category: CAT IV (with VT 2x60), Protection resistance: 4 MOhm (each voltage input)
Dimensions 210 x 105 x 40 mm (basic device); 406 x 330 x 174 mm (transport case)
Weight basic device: approx. 0,55 kg; total standard setup: 6,5 kg