Buying multimeter and what to consider? This article gives you some more information about what you should take in consideration when buying a multimeter. A lot of people don’t know exactly what they need to consider, so this article is made to help with picking the right meter.
There are a few things that you need to think about before you even start to look for a meter. Take a piece of paper and write down the answers on the following questions.
1. What accuracy do I need?
2. Do I need a True RMS Converter?
3. Resolution or Digits?
4. What input impedance do I need?
The accuracy of a multimeter is simply what the maximum allowed error limit is. Most of the times the accuracy is expressed as ±(% of reading + number of least significant digit (LSD).
True RMS Converter or not?
If you take a look at the multimeters, there are two different types. There is an “true RMS” and a “average-responding” meter. The true RMS values are not only the average of the absolute value of the curve. It only works with sinusoidal waveforms but when the waves are more complex it will not work anymore. An average responding multimeter will will only display the same values for sine waves. For other waves there will be a much bigger difference. You really want to have that feature when you want to measure non-linear loads for example electronic controls. Read more information about TRMS in this article.
Resolution or digits?
If there is a small change in a input signal the resolution will be defined. The resolution of a digital multimeter is always showed by the number of digits it can display. Another word for the solution is “count”, it is exactly the same but just different words.
What input impedance do I need?
Compared to the circuit impedance the input impedance of multimeters are very high. In this case the meter will not be influenced negatively by the circuit. If you want to start measuring highly sensitive electronics it is very important to get a meter with a high input impedance. This is because you will get a more precise result. There is also a possibility when you get a meter with a lower input impedance that you will get a influenced result.
The answers you have given to these questions will help you with an indication of which meter is right for you. To make it easy for you we have a link to a product overview of cheap and more professional meters. Click here for the overview.
If you have made your choices on the above questions, you can start taking a look at the multimeter brands and their specifications.