NASGQ Series Digital Display Clamp-on Phase Meter
Product introduction
NASGQ series Digital Display Clamp-on Phase Meter is special designed for voltage, current and phase tests, it is in high-precision, low price, portable hand-held, dual-channel input measuring. It's easy to measure the phase between U-U, I-I and U-I, identify the inductive circuit ,capacitive circuit and the phase sequence of three-phase voltage, detect the wiring group of transformer, test the secondary circuit and bus differential protection system, display the phase relationship among the CT groups of a differential protection system, and check if the wire of electric meter was correctly connected. When testing customers do not need cut off the tested current which input by slip core current transformer. When measuring the phase between U1 and U2, the two input circuit loop are completely isolated, so the possible miss connection is absolutely avoided, which may result in short circuit and may even burn the meter. The monitor of the device is high-contrast LCD screen, and the character in which could be as high as 25mm, and can be freely rotated approximately 70 °, which helps to obtain the best visual effects.
The shell of the device is made of engineering insulating material, together with a rubber–made anti-vibration protection kits for safety and reliability.

Also called name
Phase meter, clamp phase meter, digital clamp phase meter,NASGQ Series Digital Display Clamp-on Phase Meter

The Characteristics of the products
1. Withstand Voltage
Parts between voltage input terminal and meter shell, parts between the iron core of the clamp-current transformer and secondary windings can stand 1000V/50Hz. Parts between the two voltage input terminals can stand Sinusoidal AC Voltage 500V/50Hz for 1min when testing.
2. Insulation Resistance
Between meter circuit and meter shell, between the two voltage input terminals:≥10MΩ

The parameters of the products
1. Intrinsic Error
1.1 Reference Operating Conditions
(1) Temperature: (23±5)℃
(2) Humidity: (45~75)% RH
(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 the nipper 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
1.2 The limits of intrinsic error
 

project		NASGQB			NASGQE
Error of AC Voltage	Measure range	20V	200V	500V	20V	200V	500V
	Resolution	0.01	0.1	1	0.01	0.1	1
	Intrinsic limits of error	±(1.2%RD+2）	±(1.0%RD+2)	±(1.2%RD+2)	±(0.3%RD+0.2% Range）
	Input Impedance	All the measure range is 2MΩ			All the measure range is 2MΩ Voltage input impedance of phase testing: >500KΩ
Error of AC Current	Measure range	200mA	2A	10A	200mA	2A	10A
	Resolution	0.1mA	1mA	10mA	0.1mA	1mA	10mA
	limits of intrinsic error	±(1.0%RD+2)			±(0.3% RD +0.2% Range）
Error of Power-frequency Phase	Range	0～360°
	Resolution	1°
	limits of intrinsic error	±3°			±2°

 
2. Operating error
2.1 Rated Operating Conditions
(1) Temperature (0~40)℃
(2) Humidity: (20~80)% RH
(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 the nipper 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
2.2 Limits of rated operating error
   Under the conditions described in 1, the limits of rated operating error will not exceed twice of the limits of intrinsic error.
3. Other technical parameters:
(1) Display: three and half digital
(2) Sampling rate: 3 times/ seconds
(3) Power supply: single laminated batteries with 9V, the current of power supply is less than 5 mA.
(4)Dimension:
The size of the shell of meter: 192mm×95mm×55mm
The size of the shell of clamp: 140mm×42mm×20mm
The size of jaws: Φ7mm×9mm
(5)Weight:
The weight of meter: 280g
The weight of clamp: 2×200g
(6)the conditions of storage:
    Temperature: -10℃~ 50℃