Actually almost the same,
Earth resistance meter is a safety type meter produced according to the principle of potential compensation. It is simple to operate, easy to carry, and widely used to measure the grounding resistance of a single grounding body and centralized grounding body. Measurement of grounding resistance is an important measure to monitor the quality of grounding and ensure the safety of electricity.
Grounding resistance meter of the national testing regulations is JJG366-2004 grounding resistance meter testing regulations
Grounding on-resistance tester (hereinafter referred to as the tester), is used for household appliances, electric heating appliances, medical equipment and measurement, control and laboratory electrical equipment, etc., by the AC power grid power supply of electrical equipment, the touchable metal shell and the safety of the ground between the ground resistance measurement. Measurement of conduction resistance between the accessible metal casing of electrical equipment powered by the AC power grid and the safety ground.
Ground on-resistance tester is through the output of AC constant current, applied to the test body of the accessible metal casing and the safety ground between, and measure the constant current flow through the body of the voltage drop, and then through the voltage value and the current value of the ratio, derived from the body of the test of the ground on-resistance value, or a direct display, directly indicating the body of the test of the ground on-resistance value. The test current is 1A, 10A, 25A, and 30A. generally not less than 25A. this device can directly output resistance, measure the current, and provide 3 1 2-digit AC digital voltmeter to measure the no-load voltage of the current source. This device can carry out the calibration of the basic error of the resistance, the calibration of the alarm preset error, the calibration of the error of the output test current value and stability test, the measurement of the no-load voltage of the current source.
"JJG 984-2004" grounding on-resistance tester picking up regulations