The Working Standard WS 2x20 is a single-phase (WS 2120) and three-phase
(WS 2320) precision reference meter for electrical power and energy measurement,
dedicated to on-site meters testing. The device can be used also as hand-held unit
for local data exchange with smart meters (programming and data readout of meters).
The device is designed for operation in single, two and three-phase systems, where
it evaluates and displays all individual quantities per phase and cumulative three-
phase ones as well.
Universal inputs can be equipped with any combination of interchangeable precision
voltage sensors working up to 600 V and current sensors working up to 6000 A or
Measurement is based on precision A/D conversion and DSP technology and enables
accurate high-speed real time evaluation of all main and informative quantities.
Beyond measurement of power, voltage, current and phase the device indicates
voltage sequence, evaluates active, reactive and apparent energy and measures
distortion and wave-form of measured signals.
The device can generate any programmed energy proportional or constant frequency
on the impulse output. This unique feature allows precision error evaluation with
minimum integration period. The device is equipped with integrated error calculator
and meter scanner capturing LED, DISK or Closed Contact output of tested meters
and snap switch for simple manual testing. Multiple optical scanners can be arranged
to wireless network for simultaneous testing of complex distribution networks with
single Working Standard. Synchronous differential mode of energy consumption is also
The device can be supplied from internal rechargeable accumulators, from external
power adapter, from car outlet or optionally also from measured voltage circuit.
Software for MS Windows enables transfer and presentation of measured data in PC.
Optional portable printer enables on-site printing of results or actual display content.
Lightweight compact size
Single- and three-phase versions, accuracy classes 0.2, 0.1, 0.05, 0.02
Color graphic display and alphanumerical keypad
USB, RS-232 and optical interface for local data exchange with multi-functional meters according to IEC 62056-21
Configuration and data stored in high capacity memory (min. 2 GB)
Vector diagram and signal shape display (oscilloscope mode)
Harmonics analysis in tabular and graphical format
LED and TTL impulse outputs with programmable energy proportional meter constant or programmable frequency
Enhanced internal database system for tested meters and measured results with search capabilities
Enhanced self-adjusting optical scanning head
Synchronous differential energy consumption measurement
Two universal input channels for any combination of Voltage and Current probes for Power or CT / VT ratio, phase and burden measurement
Optional wireless communication interface and wireless scanning head network for simultaneous testing of multiple delivery nodes
Enhanced fast synchronization of measured data and configuration with PC
PC software for MS Windows
Transport case with high protection degree
Optional portable printer for printing of results and actual display content
Optional universal isolated input/output (relay, logic signal)
Configurable user interface (regional and functional modifications)