What is a digital multimeter?

In this article, we will describe its basic information and its difference from an analog multimeter.

▪ Summary

The condition of electronic equipment needs to be determined using a measuring instrument. For electronic devices whose condition cannot be determined visually, it is recommended that a digital multimeter be used. In this section, we will introduce the basic knowledge and types of digital multimeters such as "What is a digital multimeter", "Is there a difference between a digital multimeter and an analog multimeter", and the selection method of digital multimeters in detail.

■ Digital multimeter that is easy to operate even for beginners

A digital multimeter is an electronic measuring instrument mainly used to measure basic electrical characteristics such as voltage, current, and resistance. Because the measured values are displayed digitally and can be read directly, they are easy to operate even for beginners.

Depending on the model of the digital multimeter, there are multimeters that can automatically switch ranges without having to manually select the measurement range. Therefore, even beginners can operate them easily. Of course, analog multimeters have their own advantages, such as "the ability to visualize changes in the measured value during measurement" and "the ability to easily understand the status of a digital multimeter by the oscillation of the analog multimeter's pointer in some cases where it is difficult to read it".

Both digital multimeters and analog multimeters have their own advantages, so be sure to clarify the purpose of the measurement and the object of the measurement before making a choice.

A digital multimeter that is easy to operate even for beginners		An analog multimeter that allows you to visualize changes in measurement values by oscillating the pointer.

■ Highly accurate digital multimeter

Although it is said that digital multimeters are highly accurate, the accuracy of the measurement results themselves is not much different from that of analog multimeters. However, the high accuracy referred to here means that the digital display can show more digits and thus can cope with higher resolutions. An analog multimeter displays values by means of a pointer, and the user may make errors when reading. This is called "reading error".

However, digital multimeters have the advantage of being displayed digitally and are therefore less prone to reading errors. If you use an analog multimeter, human error can occur no matter how careful you are, so many people prefer digital multimeters that are easy to read measurements.

Another advantage of digital multimeters, unlike analog multimeters, is that they are easy to read even in dark places because they do not have fine scales and can read values directly. Therefore, it can be said that digital multimeters excel in "readability" (*1). Some models of digital multimeters can be connected to a personal computer for even more accurate data measurement.

※1 If the stability of the measurement object is poor, the smallest digit number in a digital multimeter may be difficult to read due to its instability. In this case, an analog multimeter may be easier to read the average value because the pointer comparison is not affected.

■ Types of digital multimeters

Digital multimeters can be broadly divided into two categories.

handheld

desktop

5 1/2 digit multimeter		7½-digit high-precision DC voltage special type

Handhelds are mainly compact digital multimeters that are small and can be used in the hand. Because they are easy to carry, they are versatile and can be used in a variety of environments, from laboratories to field work. Small size does not mean low functionality, and there are also high-end models available, so you can choose the right model for your purpose. There are generally a variety of types available, such as handheld, card and pen models.

On the other hand, benchtop multimeters are stationary digital multimeters. They are often integrated into workstations, systems and production lines, and some are capable of displaying multiple digits. There is also a trend towards high value-added digital multimeters, which can be used alone or in connection with a computer to perform data transfer, averaging and advanced arithmetic.

When choosing a digital multimeter, you need to consider "Do I need portability?" and "Is this something that can only be done with a benchtop multimeter?" etc.

■ Methods of selecting digital multimeters

Due to the wide range of features of digital multimeters, many first-time buyers may not know how to choose one. First, see if it has the required functions, ranges, resolution, etc. Second, if you are going to work outdoors such as in the field, it is recommended to choose a model that is suitable for use in the corresponding environment.

If the device needs to be carried around a lot, then use of a large model is not an option. In addition, since compact digital multimeters are available in both small, simple card-type models and highly functional hand-held models, the operating environment should also be carefully considered better. It is also important to choose a digital multimeter with appropriate accuracy.

Of course, the advantage of a digital multimeter with multiple functions is that it can be adapted to many work environments. However, if your application does not require high accuracy, there is no need to choose a more expensive digital multimeter. Just choose a model that has the right accuracy and functions for your needs.

It is also important to choose a digital multimeter that is suitable for the safety requirements of your workplace.

■ Choosing the right digital multimeter for your needs

Digital multimeters tend to be powerful, with easy-to-read values, high accuracy and high resolution. Due to the wide variety of multimeters available, many people have difficulty choosing the right one for them. To choose a digital multimeter, it is crucial to first determine "which functions you want to use". Also consider its operating environment and safety so that you can pick a digital multimeter that is more suitable for you.