What frequency do ground resistance testers typically output to ensure accurate measurements?

Ground resistance testers often output at frequencies other than the standard power frequencies like 50 hertz or 60 hertz to ensure accurate measurements. This practice is crucial because using a frequency that is significantly different from those commonly encountered in electrical systems helps to reduce the influence of power system noise and interference on the measurement process.

By employing a frequency outside of the typical power line frequencies, the tester can enhance the sensitivity of the measurement and obtain more accurate readings of ground resistance, which is critical for ensuring the effectiveness of grounding systems. This capability ensures that the testing results are not skewed by signals present in the surrounding electrical environment.

Using frequencies such as 100 hertz or other specially chosen frequencies allows for better differentiation of the test signal from the noise, facilitating more reliable and consistent measurements of ground resistance.