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HZJD-470A Digital Ground Resistance Tester Ground Resistance Measurement Device
HZJD-470A Digital Ground Resistance Tester Ground Resistance Measurement Device
HZJD-470A Digital Ground Resistance Tester Ground Resistance Measurement Device

I. Introduction

HZJD-470A digital grounding resistance tester is designed and manufactured according to the new lightning protection grounding resistance detection standard. The short-circuit test current can reach 20mA. The precision 3-wire method or simple 2-wire method can be used to measure the grounding resistance, and FFT (fast Fourier transform) is introduced. Technology, using digital filtering algorithm, has unique anti-interference ability and environmental adaptability, and has strong consistency in repeated tests. It is widely used in grounding resistance and grounding voltage measurement of electric power, telecommunications, meteorology, oil field, construction, lightning protection and industrial electrical equipment, etc.

The instrument has a unique line resistance calibration function, which is more accurate in the measurement of low-value grounding resistance on site, and can avoid errors caused by changes in line resistance caused by long-term use of the test line; it can avoid errors caused by the test line not being fully inserted into the instrument interface or poor contact. Error; it can avoid the error caused by the user changing or lengthening the test line.

The instrument is composed of host, test line, auxiliary ground rod, data software, communication line and so on. The host adopts an integrated hand-held design, which has low density, light weight, superior strength, rigidity, hardness, wear resistance, heat resistance and insulation performance, ensuring high precision, high stability and high reliability of various environmental tests . The main unit has a large LCD display with backlight and bar graph instructions, which are clear at a glance, and can store 300 sets of data. Through the data software, functions such as reading, consulting, saving, reporting, and printing of historical data can be realized.

II. Technical Specifications

Function

Ground resistance, ground voltage, low value resistance measurement

Power supply

DC 14.8V 2600mAh rechargeable lithium battery , the battery is fully Charged at about 16.8V

Backlight

Controllable white screen backlight, suitable for use in dark places

Measurement method

Precise three-wire method and simple two-wire method to measure grounding resistance

Measurement methods

Earth resistance measurement: Rated current changing pole method

Voltage to ground: average value rectification (between PE interfaces)

Range

Ground resistance: 0.000Ω200KΩ

Ground voltage: AC 0.000V600V (50Hz/60Hz)

Resolution

0.001Ω ; 0.005V

Precision

Ground resistance: ±2%rdg±5dgt

Note: 1. Auxiliary connection Rc: 500Ω~1000Ω error≤±5dgt

2. Auxiliary connection Rp: 500Ω~10KΩ error≤±3dgt

3. When the interference voltage is 5V, the additional error is ≤±5%rdg± 5dgt

Ground voltage: ±2%rdg±3dgt (50Hz/60Hz)

Test voltage waveform

Sine wave

Test frequency

700Hz

Test current

0.000Ω~100.0Ω range: about 20mA constant current

100Ω~200.0KΩ range: about 0.1mA constant current

Open circuit test voltage

AC 40Vmax

Display mode

Large LCD display

Measurement indication

LED flashing indication during measurement, LCD countdown display

LCD size

128mm×75mm

LCD display field

124mm×67mm

Product Size

Meter size: length, width and height 258mm×21 5 mm×83mm

Package size: 27 0mm *16 0mm *25 0mm

Test line

3 pieces: red 15m, yellow 10m, green 5m each

Simple test line

2 pieces: 1 piece of red 1.6m and 1 piece of green 1.6m

Auxiliary ground rod

2 pieces: φ 10mm× 20 0mm

Measure time

Ground voltage: about 2 times/second; ground resistance: about 5 seconds/time

Measurement times

More than 5000 times (short circuit test, test once, stop for 30 seconds and test again)

Line voltage

Measured below AC 600V

Communication Interface

With USB interface

Communication line

1 USB communication line

Data retention

HOLD ” symbol indicates when data is held

Data storage

300 groups, " HOLD " storage indication, " FULL " symbol is displayed when the storage is full

Data review

READ " symbol indicates when looking up the data

Overflow display

OL " symbol indication when over-range overflow

Interference test

Automatic identification of interference signals; when measuring, the voltage of interference signals between PEs is higher than 5 volts, and the LCD displays NOISE symbols

Alarm function

When the measured value exceeds the alarm setting value, "beep-beep-beep--" alarm prompt

Battery voltage

When the battery power is lower than 25%, the low battery voltage symbol is always displayed, reminding that it needs to be charged in time; when the battery power is lower than 10%, the LCD screen continues to flash, and the instrument will automatically shut down after about 5 seconds

Automatic shut-down

When there is no operation, it will automatically shut down after about 15 minutes

Power consumption

Backlight: 25mA Max (power consumption of backlight alone)

Standby: 35mA Max (backlight off after power on)

Measurement: 150mA Max (backlight off)

Quality

Meter: 1.55kg (including battery)

Total mass: 3.45kg (including packaging)

Working temperature and humidity

-10℃40℃; below 80%rh

Storage temperature and humidity

-20℃60℃; below 70%rh

Overvoltage protection

AC 75V between CE ports

AC 600V between PE ports

AC 600V between PC ports

Insulation resistance

>500MΩ between test line and case

Withstand voltage

AC10.0kV 50Hz between the test line and the case for 1min

Electromagnetic properties

IEC61326(EMC)

Suitable for safety regulations

IEC61010-1 (CAT Ⅲ 300V, CAT IV 150V, pollution degree 2);

IEC61010-031; IEC61557-1 (grounding resistance); JJG 366-2004 (grounding resistance meter).


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