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General Information:
EP8420 Dual-clamp digital phase meter is a multi-functional instrument developed specially for on-site test. Featured with high precision, good stability, less power consumption and easy operation, it measures directly A.C. voltage and A.C. current even when the tested circuit is not opened, as well as phase between two voltages, two currents and the voltage-current. In addition, it measures indirectly power factor and power of the circuit, identifies three-phase sequence, wiring group, inductive and capacitive circuit of transformer, tests secondary circuit and the busbar differential protection system, tells the phase relation between different CT groups of differential protection, examines whether the wiring of watt-hour meter is correct, and checks and repairs circuit equipment, etc. The instrument has huge LCD screen, with letters reaching 40mm in height and looks greatly clear thanks to the backlight design. The instrument is applicable to electricity, petrochemical engineering, metallurgy, railway, meteorology, industrial and mining enterprises, academic institutions, colleges and metrological sectors, etc.

Technical Specifications
Reference Conditions and Operating Conditions

Influence Factors

Reference Conditions

Operating Conditions

Remarks

Ambient environment

23±1

-1040

Ambient humidity

40%60%

80%

Signal waveform

Sine wave

Sine wave

β=0.05

Signal frequency

50HZ±1HZ

45HZ65HZ

Working voltage

9V±0.1V

9V±1V

Phase current range applicable

1A±0.1A

10mA20.0A

Phase voltage range applicable

100V±10V

30V600V

External electric field and magnetic field

Shall be avoided

Location of tested wire

The tested wire is located in approximate geometric center of the clamp jaw

General Specifications

Function

Directly test phase, A.C. current, A.C. voltage, A.C. leak current, and phase sequence; identify grouping, inductive, and capacitive circuit of transformer; and indirectly test power factor and power.

Power Supply

DC9V alkaline dry batteries (1.5V AA×6)

Power Consumption

Nearly 35mA at the maximum if backlight on, batteries work continuously for nearly 40 hours.

Nearly 5mA if backlight off, batteries work continuously for 300 hours.

Display

LCD display, blue screen with backlight design, applicable to dark places.

LCD Size

70mm×62mm

LCD Display Field

64mm×54mm

Instrument Size

(L x W x H): 196mm×92mm×54mm

Jaw Size:

φ7.5mm×13mm

Sampling Rate

Nearly 3 times/second

Range

A.C Voltage: 020V/200V/600V

A.C Current: 0200mA/2A/20A

Phase: 0360°

Range of tested signal during phase measuring

When measuring phase U1-U2: 30V600V

When measuring phase I1-I2: 10mA20.00A

When measuring U1-I2 or I1-U2: 10V600V, 10mA20.00A

Data-hold

Press HOLD to hold data during test, and DH displays.

Auto power-off

The instrument shut off automatically in 15min after startup so that to reduce battery consumption.

Voltage test

When the battery voltage is less than 7.2v, the low voltage symbol appears, reminding to replace the battery.

Weight of instrument

The body is nearly 550g (battery included), the clamp is nearly 170g x2, and the test wire is nearly 250g.

Length of test wire

1.5m

Line length of current clamp

2m

Operating temperature and humidity

-1040 80%Rh and less

Storage temperature and humidity

-106070%Rh and less

Input impedance

Input impedance of tested voltages: 2MΩ

Input impedance of voltage when testing phases U1U2: 40kΩ

Withstand voltage

Withstand voltage between upper cover of the instrument and bolt on battery cover place is 2000V/50Hz sine wave A.C. current for one minute.

Insulation

Insulation between wires and the shell of instrument and insulation between two voltage input ends ≥10MΩ.

Structure

Double insulation

Basic Errors and Performance Indexes under Reference Conditions

Category

Range

Resolution

Basic Error

Voltage

20V

0.01V

±(1.2%rdg+2dgt)

200V

0.1V

500V

1V

Current

200mA

0.1mA

±(1.0%rdg+2dgt)

2A

1mA

10A

10mA

Phase

0360°

±1°