PEWM-3C-1 Portable single-phase energy standard class 0.2
APPLICATION AND BRIEF DESCRIPTION
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). The registers 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 and harmonic 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 Windows (Win 98, XP, Vista). 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.TECHNICAL DATA OF PEWM-3C-1
| Power supply | |
| auxiliary | 230V ± 15% , 50 / 60 Hz |
| from the measuring circuit | 45V ÷ 480V |
| Power consumption | max 8VA |
| Dimensions | 220 x 130 x 60 mm |
| Weight | 1.4 kg |
| Housing | plastic |
| Operation temperature | -10°C ÷ + 50 °C |
| Relative humidity | Max 95% at 25 °C , non condensing |
| Pulse output | 50 000 imp/ kWh (kVarh) |
| Graphic, back lit, LCD display | 160 x 128 pixels |
| Degree of protection | IP52 |
| Jaw capacity of 100A CC | 12 mm diameter |
SAFETY TESTS: EN 61010-1 (Transient over voltage category ІІІ, Degree of pollution 2)
EMC TESTS: EN 61010-4-2, EN 61000-4-4, EN 61000-4-5, EN 61000-4-6
FUNCTIONALITY: according to IEC 60736
ACCESSORIES: Voltage cables – 2 m (2 units); Current cables 100A; Current cables 10A; PEWM-3C-1 Software;
Hand switch; Optical scanning head and frame; Instructions manual; Transport case.
MEASUREMENT ERROR
| ERROR | RANGE | |
| Voltage measurement | ± 0.05 [%] * | 10V ÷ 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 100A current clamps | ± 0.2 [%] * | 0.200А ÷ 100.00А |
| ± 0.2 [%] ** | 0.020А ÷ 0.199А | |
| 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 [%] * | 0.200A ÷ 100.00A |
| ± 0.2 [%] ** | 0.01A ÷ 0.199A | |
| Frequency | 0.01Hz | 45Hz ÷ 65Hz |
| Phase-shift | 0.01° | 0.0° ÷ 359.99° |
| Temperature coefficient | 0.0015% / °C | 0°C ÷40°C |
Notes: * 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).
ACCESSORIES:
| -Voltage Cables . 2 m (2 units) | - PEWM-3C-1 Software | - Hand Switch |
| -Optical Scanning Head and Frame | - Instructions Manual | -Transport Case Peli. 1430 |
| -Compensated current clamps 100 A | - Crocodile clips | - Power Supply Cable |
FUNCTIONS OF PEWM-3C
General measurement
General measurement The true RMS values of voltage and current, the angle between them, active and reactive power and the frequency are indicated in this mode.
Error measurement
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.
Register error measurement
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 [%].
Harmonics
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.
Oscilloscope
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.
Memory
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.
Thermal printer
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.
Mode "PC"
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.