DC High Current GeneratorThis instrument is a high-precision, low-cost, handheld, dual-channel input measuring instrument 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, identify inductive and capacitive circuits, determine the phase sequence of three-phase voltages, detect transformer connection groups, test secondary circuits and bus differential protection systems, read the phase relationship between CTs in differential protection groups, and check the correctness of watt-hour meter wiring. It uses clamp-type current transformers for current input, so there is no need to disconnect the measured line during measurement. When measuring phase, the two input circuits are completely insulated and isolated, thus completely avoiding possible short circuits of the measured line caused by incorrect wiring, which could otherwise burn out the measuring instrument. The display uses a high-contrast LCD with a character height of up to 25mm, and the screen angle can be freely adjusted by approximately 70° for optimal viewing. The instrument housing is made of engineering insulating material, and is equipped with a rubber shockproof protective cover, ensuring safety and reliability.
1. Reference working conditions: 1) Ambient temperature: (23±5)℃ 2) Ambient humidity: (45～75)% RH 3) Measured signal waveform: sine wave, β=0.02 4) Measured signal frequency: (50±0.2)Hz
5) Position of the measured current-carrying conductor in the clamp: any 6) When measuring phase, the amplitude range of the measured signal: 100～220V, 0.5A～1.5A 7) External reference frequency electromagnetic field interference: should be avoided 2. Basic error limits 1) AC voltage (see Table 1)
1. Rated working conditions 1) Ambient temperature: (0～40)℃ 2) Ambient humidity: (20～80)% RH 3) Measured signal waveform: sine wave, β=0.05 4) Measured signal frequency: (50±0.5)Hz 5) Position of the measured current-carrying conductor in the clamp: any 6) When measuring phase, the amplitude range of the measured signal: When measuring U1-U2 phase: 30V～500V; when measuring I1-I2 phase: 10mA～10.00A; when measuring U1-I2 or I1-U2 phase: 10V～500V, 10mA～10.00A 7) External reference frequency electromagnetic field interference: should be avoided 2. Rated working error limits Under the rated working conditions described in 1, the rated working error limits for each measured quantity shall not exceed twice the corresponding basic error limits.
1. Display digits: three and a half digits 2. Sampling rate: 3 times/second 3. Power supply: single 9V laminated battery, power supply current less than 5mA
Meter body: 280g; measuring clamps: 2×200g 6. Storage conditions: temperature: -10℃～50℃
Clamp handle and secondary winding wire: The two voltage input terminals can withstand a sinusoidal AC voltage of 500V/50Hz for 1 minute. 2. Insulation resistance: Between the instrument circuit and the housing, and between the two voltage input terminals: ≥10MΩ.
Press the ON-OFF button, and rotate the function range switch to correctly select the test parameter and range. 1. Measuring AC voltage: Set the function range switch to the 500V range corresponding to parameter U1, and input the measured voltage from the U1 jack to measure. If the measured value is less than 200V, you can directly rotate the switch to the 200V range corresponding to U1 for measurement to improve accuracy. The two channels have identical voltage testing characteristics, so you can also set the switch to the range corresponding to parameter U2 and input the measured voltage from the U2 jack for measurement. 2. Measuring AC current: Rotate the switch to the 10A range corresponding to parameter I1, connect the secondary lead wire of the clamp-type current transformer labeled I1 to the jack, and clamp the jaw onto the measured line to measure. Similarly, if the measured value is less than 2A, you can directly rotate the switch to the 2A range corresponding to I1 for measurement to improve accuracy. When measuring current, you can also rotate the switch to the range corresponding to parameter I2, connect the measuring clamp labeled I2 to the I2 jack, and clamp the jaw onto the measured line.
3. Measuring the phase angle between two voltages: To measure the phase angle of U2 lagging U1, set the switch to parameter U1U2. During measurement, you can rotate the switch clockwise to the ranges of parameter U1 at any time, or counterclockwise to the ranges of parameter U2, to measure the U2 input voltage. Note: When measuring phase, the symbols U1, U2 next to the voltage input jacks and the red "*" symbol on the clamp-type current transformer are the phase same-name terminals. 4. Measuring the phase angle between two currents: To measure the phase angle of I2 lagging I1, set the switch to parameter I1I2. Similarly, during measurement, you can rotate the switch clockwise to the ranges of parameter I1 at any time to measure I1 input current, or counterclockwise to the ranges of parameter I2 to measure I2 input current. 5. Measuring the phase angle between voltage and current: Input the voltage from U1, use the I2 measuring clamp to input the current from I2, and rotate the switch to the U1I2 position to measure the angle by which the current lags the voltage. During the test, you can rotate the switch clockwise to the ranges of parameter I2 at any time to measure current, or counterclockwise to the ranges of parameter U1 to measure voltage. Alternatively, you can input the voltage from U2 and use the I1 measuring clamp to input the current from I1.
6. Phase sequence discrimination for three-phase three-wire power systems: Set the rotary switch to the U1U2 position. Connect phase A of the three-phase three-wire system to the U1 jack, connect phase B simultaneously to the ± jack corresponding to U1 and the ± jack corresponding to U2, and connect phase C to the U2 jack. If the measured phase value is around 300°, the system under test is in positive sequence; if the measured phase is around 60°, the system is in negative sequence. Alternatively, connect phase A to the U1 jack, phase B simultaneously to the ± jack corresponding to U1 and the U2 jack, and phase C to the ± jack corresponding to U2. In this case, if the measured phase value is 120°, it is positive sequence; if the measured phase value is 240°, it is negative sequence. 7. Phase sequence discrimination for three-phase four-wire systems: Set the rotary switch to the U1U2 position. Connect phase A to the U1 jack, phase B to the U2 jack, and the neutral line simultaneously to the ± jacks of both input circuits. If the phase display is around 120°, it is positive sequence; if the phase display is around 240°, it is negative sequence. 8. Inductive and capacitive load discrimination: Set the rotary switch to the U1I2 position. Connect the load voltage to the U1 input terminal, and the load current through the measuring clamp to the I2 jack. If the phase display is in the range of 0°～90°, the load under test is inductive; if the phase display is in the range of 270°～360°, the load is capacitive.
If you need to change the display angle, press the lock button above the display with your finger and flip out the display to the most suitable viewing angle.
When the low battery indicator symbol appears on the LCD screen, it indicates insufficient battery power, and the battery should be replaced. When replacing the battery, you must disconnect the input signal and turn off the power. Unscrew the rear cover screws, remove the rear cover, and then replace the 9V dedicated battery.
