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Nov 4, 2021
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How to measure current up to 100 A or even up to 1000 A with an ordinary multimeter

An ordinary multimeter, available to almost any radio amateur, is capable of measuring current only up to 10 amperes. But what if you need to measure a larger current, several times and even tens of times higher than this value? Everything is very simple and now you will be convinced of it. With the help of this life hack, you can measure almost any current with an ordinary Chinese tester.

How to measure current up to 100 A or even up to 1000 A with an ordinary multimeter

You will need the following:

The article will discuss how to measure current up to 100 A, hence the composition of the components.

  • Single-core wire with a cross section of 1.5 sq. Mm.
  • Laboratory block.
  • Wires with crocodile clips.
  • Load in the form of incandescent lamps and electric motor.

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How to measure any current with an ordinary multimeter

The essence of the method is that we ourselves will make an ammeter from a shunt and a microvoltmeter, which will be a multimeter.

We measure out a piece of single-core copper wire. A piece of 20 cm will be enough.

How to measure current up to 100 A or even up to 1000 A with an ordinary multimeter

Using a clerical knife, remove the insulation from it.

How to measure current up to 100 A or even up to 1000 A with an ordinary multimeter

We take the wires with clamps and connect them to the multimeter. This is not necessary, just for the convenience of moving the contact along the bus.

How to measure current up to 100 A or even up to 1000 A with an ordinary multimeter

An elementary diagram will look like this:

How to measure current up to 100 A or even up to 1000 A with an ordinary multimeter

The shunt is included in the load break. The multimeter is set to the millivolt measurement mode – “200 mV”.

Next, we calibrate. We set a current of 1 A on the laboratory source.

How to measure current up to 100 A or even up to 1000 A with an ordinary multimeter

And moving the clamp along the shunt we achieve equal readings on the source and the multimeter.

How to measure current up to 100 A or even up to 1000 A with an ordinary multimeter

To retest, set 10 A on the block and check the readings on the tester.

How to measure current up to 100 A or even up to 1000 A with an ordinary multimeter

Everything works fine. To check, we will test our 100 A ammeter on a load.

How to measure current up to 100 A or even up to 1000 A with an ordinary multimeter
How to measure current up to 100 A or even up to 1000 A with an ordinary multimeter

The readings are the same. At the end, we will put a “short” one on the old battery.

How to measure current up to 100 A or even up to 1000 A with an ordinary multimeter

As a result, the short-circuit current was approximately 80 A.

In conclusion, I would like to say that this method can measure any current, you only need to select the shunt cross-section in accordance with the strength of the measured current.

Watch the video

How to make a display backlight for a Chinese multimeter – https://sdelaysam-svoimirukami.ru/7285-kak-sdelat-podsvetku-displeja-dlja-kitajskogo-multimetra.html

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