Voltmeters – Interchangeable scale

Voltmeter with voltage measurement. True RMS value. Interchangeable scale option. DIN rail or panel

Connections

Dimensions

Our sliding iron voltmeter

A voltmeter is a digital or analog instrument used to measure the potential difference between two points of the same electrical circuit. Almost all voltmeters can perform these measurements on most electrical devices. They are also capable of measuring DC currents, transistors and even battery testing. A wide variety of voltmeters are available on our website, including the moving iron voltmeter with voltage measurement and with an interchangeable scale option.

How is this instrument used?

In order to measure the potential difference correctly, it must be placed in parallel. So it should be connected across the points between which the measurement is desired. This means that the instrument must have an internal resistance as high as possible so that there is no wrong voltage measurement.

What the voltmeter does is to record the positive electric charge that circulates through a point of the electrical circuit. It then measures the negative charge at another point. Thus, it is not surprising that these devices are found in objects used in everyday life, such as a car. The car voltmeter measures the voltage between two terminals of the battery to check the proper functioning of its electrical system.

The different types of voltmeters

Generally speaking, we can find two types: analog and digital. The analog ones are perfect for measuring voltage, resistance, current, signal power and frequency. This type of instruments are characterized by having more precision than the digital ones in terms of diode testing. In contrast, digital voltmeters are known for their accuracy in calculations such as resistance, voltage and current. It should be added that the accuracy is tighter than analog voltmeters, as they display numbers to exact decimal places. They can also be set to measure in ohms, amps and volts.

The parts of a voltmeter

  • All of these instruments are characterized by having:
  • A positive input terminal, which is usually red in color.
  • A negative input terminal, which is usually black.
  • If it is analog, it will have a scale where the results of the measurement can be read. If it is digital, the results can be read on the LED or LCD display.

Voltmeter, voltameter or ammeter?

Although all three are measuring instruments, it is important to differentiate between them. First of all, it is key to consider that a voltmeter measures voltage, i.e. electrical potential, while a voltameter measures electrical charge. In addition, the former expresses the measurement in volts and the latter in coulombs.

On the other hand, the difference between a voltmeter and an ammeter is that the first one measures the voltage of the electrical circuit and the second one measures the current intensity. A decisive aspect to differentiate them is that the voltmeter is connected in parallel and the ammeter is connected in series.

DIN rail
EC5VR – 45×52,5 mm DIN – 0,15kg

Interchangeable scale 90º Lateral
EC5V – 48x48mm – 0,14kg
EC4V – 72x72mm – 0,2kg
EC3V – 96x96mm – 0,25kg

Measuring range: 100V, 110V
Scale: 90°.
Frequency: 45…65 Hz
Accuracy: 1.5 %.
Power consumption: 1.5…3 VA
Module: 1.2 x/100 V or 1.2 x/110V
Scale (Vn): 1.2 times the primary of the voltage transformer.

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Voltmeters – Interchangeable scale

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Voltmeters – Interchangeable scale