The single-phase energy standard PEWM-3C-1-1 is used for a quick check on site of all types single-phase electricity meters – for active, reactive or apparent energy, electromechanical and electronic. The voltage and the current are measured at the same time. The current can be measured directly within 10A or 100A range or with current clamp to 100A. The current clamp is electronically compensated.
Error of the electricity meter can be determined. The disc revolutions or the pulses from the electricity meter can be counted with a universal scanning head (type EH 11) or manually with the help of a hand switch. The scanning head is suitable for disk flag detection (red or black), or LED pulses from electronic meters (square, pulse, or modulated). Theregisters of the electricity meter can be tested too, a preliminary quantity of energy being set in this latter case.
Other functions of the device are indication of the numerical values of current, voltage, phase shift, power, cos φ andharmonic distortion measurement; drawing of two input signals in real time (two beam oscilloscope).
The device is powered from the voltage measuring circuit or from an auxiliary supply.
200 screen displays of error or vector diagram measurement can be memorized in a non-volatile memory and transferred to a computer via RS 232. The PEWM-3C-1 Software is operating under latest versions of Windows. The program transfers the readout data into a database, and can perform search with different criteria and print of reports. The measurements can be printed on a thermal printer, connected to the RS232C output, or transferred to a computer. The unit can be remotely controlled by a PC.
The device indicates the electricity meter error in [%] and the true value of energy in this mode. The delivery of pulses is traced with a bar-graph. The pulses or revolutions number “r”, the constant of the electricity meter “X” are preset by the operator. The measurement can be changed for active , reactive and apparent energy. The operator can enter the pulses manually or with the help of a scanning head.
The value of energy is preset in this mode. The measurement is started and stopped by the operator using the relevant button. The error of the register is indicated in [%].
The harmonic content of each input signal of voltage or current can be measured in this mode. The amplitude in [%] of the 1st harmonic and the initial phase of the odd harmonics up to the 29th are indicated. The value to expand into harmonics is determined by the operator among the 2 input signals. The measurement and the corresponding screen display are renewed every two seconds.
Two signals are drawn on-line on the display. The signals are selected by the operator. Near the waveforms, the true RMS value of the corresponding signal in [V] or [A] is displayed.
200 electricity meter measurements can be stored in a non-volatile memory, and transferred to a computer via RS 232. The following data are stored: number of electricity meter (alpha-numerically); the current, voltage and power factor values; error of the electricity meter; the transformation ratio, regime. The program in the computer operates under Windows 98 ,XP, Vista, 7 and has the following features: printing of protocol; archive file organization; data search from the archive.
The thermal printer is connected to the RS232C output of the unit. Whenever a save function is performed, the saved information will also be printed, if the printer is powered on.
The unit can be remotely controlled by a PC and together with a phantom load can be used as an automatic testing system for one electricity meter.
|auxiliary||230V +10% -25%, 45 … 65 Hz|
|from the measuring circuit||45V ÷ 480V, 45 … 65 Hz|
|Power consumption||max 8VA|
|Dimensions||220 x 130 x 75 mm|
|Operation temperature||-10°C ÷ + 50 °C|
|Storage temperature||-20°C ÷ +60°C|
|Temperature coefficient||100 ppm / °C|
|Relative humidity||Max 95% at 25 °C , non condensing|
|Graphic, back lit, LCD display
or color 5" display, 65K colors
|160 x 128 pixels
|Degree of protection||IP52|
|Jaw capacity of 120A CC||12 mm diameter|
|Jaw capacity of 150A CC||20 mm diameter|
|Voltage measurement||± 0.1 [%] *||30V ÷ 300V (overburden up to 500V)|
|Current measurement (direct to 120A)||± 0.10 [%] *||0.50А ÷ 120.00А|
|± 0.10 [%] **||0.05А ÷ 0.49А|
|Current measurement (direct to 12A)||± 0.10 [%] *||0.05А ÷ 12.00А|
|± 0.10 [%] **||0.01А ÷ 0.05А|
|Current measurement with 120A current clamps||± 0.2 [%] *||0.100А ÷ 120.00А|
|± 0.2 [%] **||0.020А ÷ 0.099А|
|Power / energy measurement (direct to 120A)||± 0.10 [%] *||0.50А ÷ 120.00А|
|± 0.10 [%] **||0.05А ÷ 0.49А|
|Power / energy measurement (direct to 12A)||± 0.10 [%] *||0.05А ÷ 12.00А|
|± 0.10 [%] **||0.001A ÷ 0.05А|
|Power / energy measurement (current clamp)||± 0.2 [%] *||0.100A ÷ 120.00A|
|± 0.2 [%] **||0.01A ÷ 0.099A|
|Frequency||0.01Hz||45Hz ÷ 65Hz|
|Phase-shift||0.01°||0.0° ÷ 359.99°|
|Temperature coefficient||0.01% / K||0°C ÷ 40°C|
* Error related to the measured value.
** Error related to the maximum value of the range.
All power / energy errors are related to apparent power (to be divided by power factor).
EN 61010-1, IEC 61010-2-032
EN 61010-4-2, EN 61000-4-4, EN 61000-4-5, EN 61000-4-6
according to IEC 60736, EN 62053