GDRK-5A is applicable for testing power frequency characteristic parameters such as the power frequency earth impedance, contact voltage, step voltage, transfer potential and electric potential gradient of the site ground surface etc.; and the soil resistivity of all kinds of earthing devices.
With the technique of anti-interference, this instrument can accurately obtain data under 50Hz power frequency in strong interference environment. The test current is relatively low (maximum 5A) and will not cause the over-potential of earthing devices during the testing. Meanwhile, as the tester has strong anti-interference ability, so that the measurement can be done with power.
The measured power frequency has fine equivalency. And the waveform of test current is sine wave. Difference between the test frequency and power frequency is only 5Hz. Measurement shall be done by adopting 45Hz and 55Hz frequencies.
The interference capacity of voltage to ground is much strong. This instrument measures by adopting the non-power-frequency method. Combining with the modern technique of wave filtering by software and hardware, it has strong anti-interference ability. Tested data is stable and reliable. Error caused by 30V power-interference voltage shall only be 0.002Ω.
High accuracy. It can be used to measure large scale ground grid with small earth impedance.
It can measure all characteristic parameters of earthing devices stipulated by relevant standards. It can not only measure the ground impedance, but also the resistive and reactive components.
Site interference can be measured, which is convenient to estimate measurement error.
Disconnection alarm function, to avoid inaccurate measurement.
Easy operation. Directly display measurement result on LCD screen.
50 groups of measuring data can be saved, with mini printer.
No need to use high current cable.
Small size, easy to carry.
|Measurement range of the impedance||0-200Ω|
|Measurement error||± (reading ×1% +0.002Ω)|
|Interference capacity of voltage to ground||error caused by 30V power-interference voltage
shall be no more than 0.002Ω (when the test current is no less than 3A).
|Waveform of test current||sine wave|
|Frequency of test current||45Hz and 55Hz|
|Maximum output current||5A|
|Maximum output voltage||200V|
|Requirement of measurement wire||sectional area of copper core for the current wire ≥ 2.5mm2
sectional area of copper core for the voltage wire ≥ 1.0mm2
|Power supply||AC220V±10%, 50Hz|
|Environment to use||Temperature: -10℃~40℃; relative humidity: <90%|
|Weight of the instrument||10.5kg|