Overview
HM2000B Double Clamp Digital Phase Meter is specially designed for measuring voltage, current and phase. It is characterized by high precision, low price, portable hand-held and dual-channel input measuring. It’s easy to measure the phase between U-U, I-I and U-I, identify the inductive/capacitive circuit and the phase sequence of three-phase voltage, check the wiring group of transformer, test the secondary circuit and busbar differential protection system, display the phase relationship among the CT groups of a differential protection system, and check if the wire of electric meter is correctly connected. Under test, you do not need cut off the tested current which is inputted by clamp-current transformer. When measuring the phase between U1 and U2, the two input circuit loops are completely isolated, so it can completely avoid short circuit and burning down the meter caused by misconnection. The display of this device is high-contrast LCD screen, and the character in which could be as high as 25mm, and can be freely rotated approximately 70 ° to obtain the best visual effects.
The shell of the device is made of engineering insulating material, together with a rubber anti-vibration protection casing for safety and reliability.
Intrinsic Error
1. Operating Conditions
1) Temperature:（23±5）℃
2) Relative humidity:（45～75）%
3) Wave forms of measured signal: Sine wave, β=0.02
4) Frequency of measured signal: 50±0.2）Hz
5) Position of Measured current carrying conductor in clamp jaw: Optional position
6) Amplitude range of measured signal when measuring phase: 100～220V, 0.5A～1.5A
7) External reference frequency electromagnetic interference: Should be avoided
2. Limits of Intrinsic Error
1) AC Voltage（see Table 1）
|
Table 1：Error of AC Voltage |
||
|
Measure range |
Resolution |
Limits of intrinsic error |
|
20V |
0.01V |
±（1.2%RD+2） |
|
200V |
0.1V |
±（1.0%RD+2） |
|
500V |
1V |
±（1.2%RD+2） |
Input Impedance：All measure ranges input 2MΩ
2)AC current（see Table 2）
|
Table 2：Error of AC current |
||
|
Measure range |
Resolution |
Limits of intrinsic error |
|
200mA |
0.1mA |
±（1.0%RD+2） |
|
2A |
1mA |
|
|
10A |
10mA |
|
3) Phase
U-U、U-I、I-I（see Table 3）
|
Table 3： Error of Power-frequency Phase |
||
|
Range |
Resolution |
Limits of intrinsic error |
|
0～360° |
1° |
±3° |
Loop impedance of input voltage when measuring phase U1-U2：40KΩ
Operating Error
1. Rated Operating Conditions
1) Temperature:（0～40）℃
2) Relative humidity:（20～80）%
3) Wave forms of measured signal: Sine wave, β=0.05
4) Frequency of measured signal:（50±0.5）Hz
5) Position of Measured current carrying conductor in clamp jaw: optional position.
6) Amplitude range of measured signal when measuring phase:
Phase U1-U2: 30V～500V
Phase I1-I2: 10mA～10.00A
Phase U1-I2 or I1-U2: 10V～500V、10mA～10.00A
7) External reference frequency electromagnetic interference: Should be avoided
2. Limits of Rated Operating Error
In item 1 Rated Operating Conditions, the limits of rated operating error should not more than twice limits of intrinsic error.
Other Technical Specifications
1. Display: three and half bits
2. Sampling Rate: 3 times per second
3. Power Supply: single 9V laminated battery, supply current is less than 5mA
4. Dimensions
Meter shell: 192x95x55mm
Clamp shell: 140×42×20mm
Clamp jaw: Φ7×9mm
5. Weight
Meter body: 280g
Measuring clamp: 2×200g
6. Storage Conditions
Temperature: －10℃～50℃
