Ggdw-III Intellight Digital Earth Ground Grid Resistance Tester (5A)

GGDW-III Intellight Digital Earth Ground Grid Resistance Tester (5A)

I. Application

GDDW-5A Grounding Resistance Tester adopts new type variable frequency AC power supply and microcomputer processing control, signal processing and other measures, which can properly solve the interference problem during test, simplify test operating process, improve precision and accuracy of test results as well as greatly reduce labor intensity of testers and test cost.
GDDW-5A Grounding Resistance Tester is applicable to the power frequency earth impedance, contact voltage, step voltage, equal power frequency characteristics and soil resistivity of various grounding devices, which can test earth network of substation (4Ω ), hydraulic and thermal power plants, microwave station (10Ω ), arrester (10Ω ) multipurpose machine types.

II. Technical Index

1. Measurement scope: 0~150Ω (including impedance of current pile)
2. Resolution: . 001Ω
3. Measurement error: ± (reading× 2%+0.005Ω )
4. Maximum output voltage: AC 400V (45Hz, 55Hz, double frequency, sine wave)
5. Maximum output current: AC 5A (45Hz, 55Hz, double frequency, sine wave)
6. Current output gears: 5/4.5/4/3.5/3/2.5/2/1.5/1A, one gear every 0.5A, totalling 9 gears.
7. Anti-jamming capacity: Power frequency resistance 50Hz voltage 10V
8. Requirement for measuring line:
Sectional area of cooper core of current line≥ 1.5mm2
Sectional area of cooper core of voltage line≥ 1.0mm2
9. Electric power supply: AC 220V± 10%, 50Hz
10. Contour dimension: 440× 350× 210mm3
11. Instrument weight: 30kg