# How to choose an appropriate measuring instrument for electrical power and efficiency measurement?

**URL:** <https://forumautomation.com/t/how-to-choose-an-appropriate-measuring-instrument-for-electrical-power-and-efficiency-measurement/1657>\
**Category:** Electrical\
**Created:** [January 14, 2017, 5:34am UTC](https://forumautomation.com/t/how-to-choose-an-appropriate-measuring-instrument-for-electrical-power-and-efficiency-measurement/1657 "2017-01-14T05:34:06Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![denizen](https://forumautomation.com/letter_avatar_proxy/v4/letter/d/848f3c/32.png) [@denizen](https://forumautomation.com/u/denizen)\
**Post date:** [January 14, 2017, 5:34am UTC](https://forumautomation.com/t/how-to-choose-an-appropriate-measuring-instrument-for-electrical-power-and-efficiency-measurement/1657/1 "2017-01-14T05:34:06Z")

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Fundamental questions for power measurement.

These questions will help you to choose the right instrument for electrical power and efficiency measurement.

1.What do i need to measure?

Is the power repetitive ? Is the power stable ? Do i also need to measure cycle by cycle or sub cycle power/transients? PWM? Noisy signal? Wiring?

2.What accuracy do i need?

3.How can i have confidence in specified accuracy?

4.Is there one instrument for all test ?

5.What about cost effectiveness ?

**Types of power measuring instruments**