Comments on: About The Impedance Of Multimeters

By: Jestine Yong

Jestine Yong — Tue, 23 Jun 2026 05:17:31 +0000

In reply to Nazir.

Hi Nazir,
You are welcome!

Jestine

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By: Nazir

Nazir — Mon, 22 Jun 2026 06:42:11 +0000

As a laboratory technician of university of Mauritius this article is of great use to me Thank you

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By: Jestine Yong

Jestine Yong — Sun, 21 Jun 2026 08:57:16 +0000

In reply to jagath.

Hi Jagath,

You are welcome!

Jestine

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By: jagath

jagath — Sun, 21 Jun 2026 07:12:53 +0000

Hi Jestine,

Thank you for the very informative article.

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By: Kushal Saini

Kushal Saini — Tue, 09 Apr 2024 05:26:44 +0000

In reply to Mark.

Hi sir iwant a Multimeter for low current AC 100ma dc 200ma

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By: Jestine Yong

Jestine Yong — Sat, 19 Nov 2022 23:28:19 +0000

In reply to michaelgp3.

Hi Michael,
Thanks for the comment!

Jestine

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By: michaelgp3

michaelgp3 — Sat, 19 Nov 2022 08:47:45 +0000

I would add that digital multimeters are, by themselves, not very useful in troubleshooting ground faults where water and the resultant corrosion is involved as continuity readings go all over the place due to the high impedance of that type. Analog multimeters will provide steady and reliable readings in these circumstances due to their lower impedance.

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By: Prasanna mendis

Prasanna mendis — Wed, 26 Jan 2022 16:52:21 +0000

In reply to Jestine Yong.

Useful article thanks for you

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By: Jestine Yong

Jestine Yong — Tue, 26 Oct 2021 02:11:38 +0000

In reply to Henrique J. G. Ulbrich.

Hi Henrique,
Thanks for the clear explanation and example. This is also why using digital meter (with 10 Megaohm input impedance) to check the DC voltage of electronic circuit be it a low or high impedance circuit would be the best choice.

Jestine

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By: Henrique J. G. Ulbrich

Henrique J. G. Ulbrich — Mon, 25 Oct 2021 15:04:36 +0000

Thanks for sharing again another useful and didactic article. The impedance of an analog multimeter is not really expressed as 20 kΩ. The correct specification is Ohm/V. In an analog multimeter specified as 20kΩ/V, this value is only found if there is a 1V scale, not common in these instruments. If a voltage of 3V is measured using such device in the 10V scale (a very common situation), the impedance of the multimeter in this case is 20kΩ * 10 = 200 kΩ. In the same sense, the same multimeter in the scale of 500 V has an output impedance of 20kΩ * 500 = 10 MΩ. So, in this case the impedance of the analog multimeter will not really affect the measurement, as compared to the digital ones. Eventual differences will be due to inherent precision (and quality/price) of the instruments, as well as their calibration status. There will be problems only when measuring low voltages in a high-impedance circuit (as the AGC voltage in the old BW TVs, as pointed out by Paris Azis). In the remaining trivial situations, the impedance of an analog multimeter will not in practice affect the precision of the measurements taken. This is true, for example, in the measurement of the 5V line from a power supply. Such a circuit have inherently a very low impedance. By the way, the load imposed by a device is also known as burden.

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