Voltmeters

A voltmeter is an instrument used to measure the electric potential difference, also known as voltage, between two points in an electrical circuit. Voltmeters are used throughout electrical, industrial, and process-control applications to monitor supply voltages, verify circuit operation, and support maintenance and troubleshooting activities.

At RS Singapore, we stock analogue and digital voltmeters in a range of panel sizes, mounting configurations, and measurement ranges. The product range includes both AC and DC electrical volt meter solutions, from general-purpose panel meters to industrial voltmeter models built for control panels, switchgear, and process-control systems.

Types of Voltmeters

The appropriate volt measurement tool depends on the type of circuit being monitored, the required accuracy, the voltage range, and the installation method. RS Singapore supplies several categories of voltmeters suitable for industrial and commercial applications.

Analogue Voltmeters

Analogue voltmeters use a moving pointer and calibrated scale to indicate the measured voltage. They are commonly used where operators need to observe voltage trends, fluctuations, or relative changes over time rather than a precise numerical value. Analogue meters are widely used in panel-mounted applications and can be found in switchboards, generator panels, and industrial distribution systems.

Digital Voltmeters

Digital voltmeters (DVMs) provide voltage measurements as a numeric readout on an LCD or LED display. They use analogue-to-digital converters (ADCs) to process the input signal, delivering higher resolution and easier readability than analogue meters. Depending on the model, digital voltmeters may offer additional functions such as programmable alarms, communication interfaces, or configurable display parameters.

Moving Coil & Moving Iron Voltmeters

Moving-coil voltmeters are primarily designed for DC measurements and operate using electromagnetic interaction between a coil and a magnetic field. They are valued for their sensitivity and relatively linear scale characteristics.

Moving-iron voltmeters can be used for both AC and DC measurements. Their robust construction makes them suitable for industrial environments, power systems, and panel instrumentation applications where durability is important.

Electrostatic Voltmeters

Electrostatic voltmeters measure voltage using electrostatic forces generated between charged elements inside the instrument. They are most commonly used in high-voltage measurement applications because they draw very little current from the measured circuit. These specialised instruments are frequently found in laboratories, calibration facilities, high-voltage testing environments, and research applications.

Panel Mount Voltmeters

Panel mount voltmeters are designed to sit flush in the cut-out of a control panel, switchgear assemblies, machinery enclosure, or distribution board. Standard DIN sizes such as 48 x 48 mm, 68 x 68 mm, and 92 x 92 mm are the most common, with the choice driven by the panel space available and the operator's viewing distance rather than the measurement itself.

Depending on the application, panel-mounted industrial voltmeters may be connected directly to the measured circuit or used with voltage transformers and associated measurement circuits where higher voltages are involved.

Industrial Applications of Voltmeters

Voltmeters earn their place in almost every setting where electricity is generated, distributed, controlled, or repaired. The five applications below cover the most common industrial uses, from routine installation checks through to specialist laboratory calibration work.

Electrical Installation & Maintenance

On new installations and routine maintenance rounds, an electrical voltmeter confirms supply voltage at outlets, distribution boards, and equipment terminals. Verifying the absence of voltage before work starts is a fundamental safety step for licensed electricians in Singapore, and a panel or handheld voltmeter is the tool that provides that verification.

Control Panel & Switchgear Monitoring

An industrial voltmeter mounted directly on a control panel gives operators a continuous readout of supply and load voltage. Analogue moving-iron units remain common for AC busbar monitoring in switchgear cabinets, while digital panel meters are preferred where remote signalling or data logging is required alongside the local display. Panel voltmeters are typically installed alongside panel ammeters on the same cabinet face.

Fault Finding & Troubleshooting

Voltage measurement is one of the most common diagnostic methods used when troubleshooting electrical systems. Engineers and technicians use a volt measurement tool to verify supply presence, check circuit continuity through control systems, and identify abnormal operating conditions. Measuring voltage at key points in the circuit can help isolate faults to specific components, wiring sections, or control devices.

Calibration & Test Laboratories

In a calibration laboratory, precision digital voltmeters serve as reference standards against which other measurement instruments are verified. Electrostatic voltmeters extend the workable range into high-voltage territory, supporting tests on transformers, insulation systems, and specialist power equipment.

Automotive & Battery Testing

Voltmeters are core to automotive electrical diagnostics and battery testing across workshops, fleet operations, and vehicle assembly lines. A DC volt measurement tool confirms battery state of charge, alternator output, and the voltage drop across cabling and connectors, which is often the root cause of intermittent electrical faults.

Trusted Voltmeters Manufacturer & Supplier in Singapore

RS Singapore is a trusted supplier and distributor of voltmeters, stocking analogue and digital panel meters across common DIN sizes and measurement ranges from brands including HOBUT, Sifam Tinsley, and RS PRO at competitive prices. We offer companion products such as digital multimeters and clamp meters to complete your test and measurement kit. Explore our guides on ammeters and shunt resistors for background on companion instruments.

Delivery is free for RS business account holders for online orders above $28 (excluding GST), with next working day delivery for orders placed Monday-Friday before 3.30pm. As delivery timings and fees may be subject to change, please refer to our delivery page for the latest terms.