This instrument is a special instrument for measuring the characteristic parameters of grounding device. The instrument adopts new frequency conversion ac power supply and frequency anti-interference technology, and adopts 32-bit ARM processor control and signal processing, which can be accurately measured in the substation's strong interference environment. The results are displayed on a large LCD screen, with a micro printer and usb flash disk storage. It mainly has the following functions:

1. Measure the grounding resistance or resistance of the grounding device.

2. Measure the conductive impedance or resistance between grounding devices.

3. Measure soil resistivity.

1.the grounding impedance measurement range: 0 ~ 5000 Ω, resolution: 0.001 m Ω

2. the measurement accuracy: + / - (reading by 1% plus or minus 0.01 Ω)

3. Connection method: standard quadrupole method

4. Automatic measurement

5. test frequency: single frequency 40 Hz, 45 Hz, 47.5 Hz, 50 Hz, 52.5 Hz, 55 Hz, 60 Hz and 65 Hz

Dual-frequency 45/55 Hz, 55/65 Hz, 45/55 Hz, 40/60 Hz

Accuracy: + / - 0.01 Hz

6. Current output :1.0 ~ 5.0a, 1A step

7. Maximum output voltage: 400V

8. Main protection: ground protection, mis-connected 380V protection, audible and visual alarm, etc

9. Requirements for the measurement line: the copper core area of the current line is not less than 1.5mm2, and the copper core area of the voltage line is not more than 1.0mm2

10. Working power :180V ~ 270VAC/10A, 50Hz + / - 1%

11. Data storage: 100 sets of measurement data are stored

12. Communication interface: standard rs-232 interface /USB interface

13, working environment: - 10 ~ 50 ℃ temperature humidity < 90%

14. Instrument weight :21kg(excluding cables)

15. Size: main engine length is 290mm * width 230 * height and 335mmmm