Overview of ground loop resistance testers

The ground loop is the main and integral device for protecting a person from electric shock during the failure of the appliance or breakdown of insulation. In order to monitor the condition of the ground electrode system, it is necessary to carry out periodic measurements, since metal parts in the earth are subject to corrosion. With the destruction of metal parts, the resistance of the circuit drops and it ceases to fulfill its protective function. In this article, we will consider instruments for measuring grounding resistance.

Instrument Overview

The F4103-M1 measuring instrument does check of a contour of any geometrical forms and sizes. The appearance of the device is shown in the photo:


Specifications are shown in the table:

Parameters Ф4103

The next in our review is a direct reference meter for determining the active resistance M416. The device is time-tested, has high accuracy and stability. This is how it looks:


Basic technical data:

Characteristics M416

Carrying out measuring work using m416 is shown in the video:

The modern microprocessor measuring device IS-10 is next in our review. LCD display, automatic measurement range, built-in memory of the last forty measurements. Shockproof housing with IP42 protection. You can see the appearance in the photo below:


The device is intended for measurements and testing of grounding elements using the two-, three-, and four-wire method. Also, it can be used to check the quality of the connection of conductors ground bus etc.

Parameters of IS-10

The instruction manual for the more advanced meter IS-20/1 is shown in the video:

Well and completes our list of instruments for measuring the resistance of the ground loop - a professional device MRU-101. The device can measure the resistivity of the soil, adapt to a specific task, using analysis and data collection. The MRU-101 has memory for the last four hundred measurements.Appearance of the meter:
MRU-101 photo

The main technical characteristics of this device:

Parameters of MRU-101

Video review MRU-101:

The principle of operation of meters

Soil resistance measurement is carried out according to the classical Ohm's law (R = U / I). The voltage source in the device supplies the potential difference to the electrodes and current is measured through the device. Having received the data, the meter calculates and displays the result. The diagram below shows the measurement scheme:

Measurement Scheme

Most measurements take place by this method or close to this principle. Following the instructions for the device you have in stock, you need to install measuring electrodes spacing them from the main ground.

Three pin measurement

Work is done within a couple of minutes, during which time the readings are established. This procedure is performed for each ground electrode separately. Learn more about how they spend grounding resistance measurementsYou can from our article.

Finally, we recommend that you watch the video, which clearly shows how the measurements are carried out by one of the apparatus considered by us - F4103-M1:

So we examined the basic instruments for measuring grounding resistance. We hope the information provided was useful to you!

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