SMG2000B digital double-clamp phase volt-ampere meter is a high-precision, low-cost, hand-held, dual-channel input measurement instrument designed for on-site measurement of voltage, current and phase. This table can be used to conveniently measure the phase between UU, II and UI in the field, determine the phase sequence of inductive, capacitive and three-phase voltage, detect the wiring group of the transformer, test the secondary circuit and the busbar protection system. Read out the phase relationship between the CTs of the differential protection groups and check whether the wiring of the meter is correct or not. The instrument generally has two kinds of test errors:
First, the basic error 1, reference working conditions 1) Ambient temperature: (23 ± 5) °C
2) Environmental Humidity: (45-75)% RH
3) The measured signal waveform: sine wave, β = 0.02
4) Frequency of the signal to be measured: (50 ± 0.2) Hz
5) The location of the measured current-carrying wire in the jaw: Any 6) The amplitude of the signal to be measured when measuring the phase: 100-220V, 0.5A-1.5
7) External reference frequency electromagnetic field interference: should be avoided 2. Basic error limit 1) AC voltage (see Table 1)
Table 1: AC voltage measurement error Limit 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: each limit is 2MΩ
2) AC current (see Table 2)
Table 2: AC Current Measurement Errors Limit Resolution Basic Error Limit 200mA 0.1mA ± (1.0% RD+2)
2A 1mA
10A 10mA
3) Phase UU, UI, II (see Table 3)
Table 3: Power frequency phase measurement error Range Resolution Basic error limit 0～360° 1° ±3°
Voltage input loop impedance when measuring U1-U2 phase: 40KΩ
Second, the working error 1, rated operating conditions 1) Ambient temperature: (0 ~ 40) °C
2) Ambient humidity: (20~80)% RH
3) measured signal waveform: sine wave, β = 0.05
4) Frequency of the signal to be measured: (50±0.5) Hz
5) The location of the measured current carrying wire in the jaw: Any 6) The range of the measured signal amplitude when measuring phase When measuring U1-U2 phase: 30V～500V
When measuring I1-I2 phase: 10mA～10.00A
When measuring U1-I2 or I1-U2 phase: 10V to 500V, 10mA to 10.00A
7) External reference frequency electromagnetic field interference: should be avoided 2. The rated working error limit is 1 under the rated operating conditions. The double-clamp phase volt-ampere meter is not exceeding the corresponding basic error limit in the range of rated working error limits to be measured. Times.
At the same time, our company also sells three clamp phase volt-ampere meter.
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Shenzhen Keith Electronic Equipment Co., Ltd. , https://www.aismtks.com