The digital dual-clamp phase meter is a high-precision, low-cost, portable, handheld, dual-channel input measuring instrument specifically designed for on-site measurement of voltage, current, and phase. With this meter, you can conveniently measure the phase between U-U, I-I, and U-I on site, determine the phase sequence of inductive, capacitive circuits, and three-phase voltages, detect the connection group of transformers, test secondary circuits and bus differential protection systems, read the phase relationship between CTs in each group of differential protection, and check whether the wiring of the watt-hour meter is correct. It uses a clamp-type current transformer to convert and input the measured current, so there is no need to disconnect the circuit under test during measurement. When measuring the phase between U1-U2, the two input circuits are completely insulated and isolated, thus completely avoiding possible short circuits in the measured circuit caused by incorrect wiring, which could otherwise burn out the measuring instrument. The display uses a high-contrast liquid crystal display with oversized characters for optimal visual effect.
The digital dual-clamp phase meter uses a clamp-type current transformer to convert and input the measured current, so there is no need to disconnect the circuit under test during measurement. When measuring the phase between U1-U2, the two input circuits are completely insulated and isolated, thus completely avoiding possible short circuits in the measured circuit caused by incorrect wiring, which could otherwise burn out the measuring instrument.
The digital dual-clamp phase meter is an ideal instrument for secondary circuit inspections in power departments, factories, mines, petrochemical, and metallurgical systems. It is especially suitable for relay protection, energy metering, power construction, and power transmission and transformation projects.
Digital Dual-Clamp Phase Meter Parameters:
1. Basic Error
1.1 Reference Working Conditions
Ambient temperature: (23±5)°C.
Ambient humidity: (45～75)% RH.
Measured signal waveform: sine wave, β=0.02.
Measured signal frequency: (50±0.2) Hz.
Position of the current-carrying conductor in the clamp: arbitrary.
Measured signal amplitude range when measuring phase: 100～220V, 0.5A～1.5.
External reference frequency electromagnetic field interference: should be avoided.
1.2 Basic Error Limits
1) AC Voltage (see Table 1):
Table 1: AC Voltage Measurement Error | ||
Range | Resolution | Basic Error Limit |
20V | 0.01V | ±（1.2%RD+2） |
200V | 0.1V | ±（1.0%RD+2） |
500V | 1V | ±（1.2%RD+2） |
Input impedance: 2MΩ for all ranges.
2) AC Current (see Table 2):
Table 2: AC Current Measurement Error | ||
Range | Resolution | Basic Error Limit |
200mA | 0.1mA | ±（1.0%RD+2） |
2A | 1mA | |
10A | 10mA | |
3) Phase U-U, U-I, I-I (see Table 3):
Table 3: Power Frequency Phase Measurement Error | ||
Range | Resolution | Basic Error Limit |
0～360° | 1° |
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