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China Ammeter and Voltmeter Suppliers - High-Quality Factory Instruments for AC and DC Voltage Measurements
Product Scope
⚡ 1. Voltmeter
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1.1 AC Voltmeter (Moving Iron Movement)
Core Design & Operational Principle
The moving iron AC voltmeter utilizes a robust attraction-type or repulsion-type moving iron movement, optimized for reliable operation in harsh industrial environments. Its non-polarized design eliminates the need for phase-sensitive wiring, making it ideal for general-purpose AC voltage monitoring applications.
Measuring Range
Direct Direct Measurement Range
0 ~ 600 V AC
This range supports direct connection to low-voltage AC systems without external signal conditioning, suitable for applications such as panel-mounted monitoring of motor control centers, distribution panels, and standalone equipment.
Extended Extended Measurement Range (With Accessory Voltage Transformer - PT)
0 ~ 9999 kV AC
For high-voltage system monitoring, the voltmeter is paired with a voltage transformer (PT) calibrated to standard secondary output ratings of 100 V AC or 110 V AC. The primary voltage range (0 ~ 9999 kV) is determined by the PT ratio, enabling safe and accurate measurement of extra-high voltage (EHV) and ultra-high voltage (UHV) transmission lines, substations, and high-voltage equipment.
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1.2 AC Voltmeter With Rectifier (Moving Coil Movement)
Core Design & Operational Principle
This voltmeter integrates a precision rectifier circuit with a highly sensitive permanent magnet moving coil (PMMC) movement. The rectifier converts AC input signals to DC, which then drives the moving coil for measurement—delivering superior accuracy and linearity compared to moving iron movements, ideal for precision voltage monitoring tasks.
Measuring Range
Direct Direct Measurement Range
0 ~ 600 V AC
Supports direct connection to low-voltage AC systems, with enhanced measurement precision suitable for laboratory testing, process control systems, and precision equipment monitoring.
Extended Extended Measurement Range (With Accessory Voltage Transformer - PT)
0 ~ 9999 kV AC
Compatible with external PTs rated for 100 V AC or 110 V AC secondary output, enabling safe measurement of high-voltage AC systems up to 9999 kV. The PT isolates the voltmeter from high-voltage circuits, ensuring operator safety and device protection.
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1.3 DC Voltmeter (Moving Coil Movement)
Core Design & Operational Principle
Featuring a permanent magnet moving coil (PMMC) movement, this DC voltmeter offers exceptional sensitivity and accuracy for direct current voltage measurement. The movement responds to the direction and magnitude of DC current, making it suitable for both positive and negative polarity DC systems (with appropriate terminal wiring).
Measuring Range
Direct Direct Measurement Range
0 ~ 2000 V DC
This broad direct measurement range eliminates the need for external shunts or signal conditioners for most medium-voltage DC applications, including battery banks, DC motor drives, solar PV systems, and DC distribution networks. For ultra-high DC voltage measurements beyond 2000 V, external voltage dividers can be integrated as a custom solution.
Frequently Asked Questions (FAQ)
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What is the difference between a Moving Iron AC Voltmeter and a Moving Coil AC Voltmeter with Rectifier?
The Moving Iron AC Voltmeter uses an attraction-type or repulsion-type iron movement that is robust and suitable for harsh industrial environments. The Moving Coil AC Voltmeter with Rectifier integrates a precision rectifier and PMMC movement, delivering higher accuracy and linearity—making it better suited for laboratory testing and precision process control applications.
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What is the maximum voltage these voltmeters can measure directly without a voltage transformer?
Both the Moving Iron AC Voltmeter and the AC Voltmeter with Rectifier support direct measurement up to 600 V AC. The DC Voltmeter supports direct measurement up to 2000 V DC. For voltages beyond these ranges, an external voltage transformer (PT) or voltage divider is required.
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How does a Voltage Transformer (PT) extend the measurement range of AC voltmeters?
A Voltage Transformer (PT) steps down high-voltage AC to a safe secondary output of 100 V AC or 110 V AC. The voltmeter measures this secondary voltage, and the actual primary voltage is calculated based on the PT ratio. This allows safe measurement of AC systems up to 9999 kV while protecting both the operator and the instrument.
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Can the DC Voltmeter measure both positive and negative polarity DC voltages?
Yes. The DC Voltmeter with PMMC movement is capable of measuring both positive and negative polarity DC voltages, provided the terminal wiring is connected appropriately to match the polarity of the measured circuit.
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What applications are these voltmeters typically used for?
These voltmeters are widely used across industrial and utility applications, including motor control centers, distribution panels, substations, battery banks, DC motor drives, solar PV systems, laboratory testing environments, and high-voltage transmission line monitoring.
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Is it possible to measure DC voltages beyond 2000 V with the DC Voltmeter?
Yes. For ultra-high DC voltage measurements beyond 2000 V, external voltage dividers can be integrated as a custom solution. This allows the DC Voltmeter to safely and accurately measure higher DC voltage levels while maintaining instrument protection and operator safety.