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Single-Phase Digital Meters for Accurate Measurement - China Suppliers & Factory Solutions

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Enhanced Technical Specification: Single-Phase Digital Meters from Leading China Suppliers

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This specification details an extensive selection of single-phase digital voltmeters (AC/DC) and ammeters (AC), expertly crafted for accurate measurement of electrical parameters in single-phase AC and DC power systems. Perfectly suited for residential, commercial, and light industrial applications—including distribution panels, control cabinets, and equipment monitoring stations—these meters offer both direct low-range measurements and extended high-range capabilities using auxiliary transformers. Sourced from top manufacturers in China, our products ensure versatility, safety, and reliability for a variety of use cases.

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    Product Details

    Product Overview

    1 Digital AC Voltmeter
    1.1 Measuring Range & Configuration

    The single-phase digital AC voltmeter offers two flexible measurement modes to accommodate low-voltage and ultra-high-voltage (UHV) single-phase AC systems:

    Direct Measurement Range

    0 ~ 600 V AC — Supports direct connection to standard single-phase AC systems (e.g., 120 V, 220 V, 230 V, 240 V, 400 V, 600 V) without external signal conditioning equipment. Ideal for on-site monitoring of lighting circuits, small appliance power supplies, and light industrial load systems.

    Extended Measurement Range (With PT)

    0 ~ 9999 kV AC — For high-voltage (HV) and UHV single-phase AC system monitoring (e.g., transmission lines, substations), the voltmeter is paired with a voltage transformer (PT) calibrated to a standard secondary output of 100 V AC. The primary voltage range is determined by the PT ratio (e.g., 110 kV/100 V, 500 kV/100 V). The PT provides galvanic isolation between the high-voltage primary circuit and the voltmeter, ensuring operator safety.

    1.2 Core Measurement Features
    • True RMS measurement algorithm — ensures accurate voltage readings even with distorted waveforms caused by non-linear loads (e.g., switching power supplies, LED lighting).
    • High-visibility digital display with clear unit indication (V/kV) for quick on-site data verification.
    • Overvoltage indication function to alert users of abnormal voltage conditions in the monitored system.
    2 Digital DC Voltmeter
    2.1 Measuring Range

    The single-phase digital DC voltmeter is engineered for direct measurement of DC voltage systems, with no need for external auxiliary devices for the specified range:

    Direct Measurement Range

    0 ~ 600 V DC — Covers common single-phase DC applications, including battery banks, DC motor drives, solar PV system outputs, and DC power supply units. The direct connection design simplifies installation and eliminates signal loss associated with auxiliary transformers.

    2.2 Core Measurement Features
    • High-precision linear measurement with minimal drift — suitable for both steady-state and fluctuating DC voltage monitoring.
    • Polarity reversal protection to prevent meter damage when connected with incorrect terminal polarity.
    • Compact DIN-rail or panel-mount design for seamless integration into control panels and electrical enclosures.
    3 Digital AC Ammeter
    3.1 Measuring Range & Configuration

    The single-phase digital AC ammeter supports two measurement configurations to meet low-current and high-current single-phase AC system monitoring needs:

    Direct Measurement Range

    0 ~ 10 A AC — Ideal for direct connection to low-current single-phase AC circuits (e.g., lighting systems, small fans, control circuits), eliminating the need for external current transformers (CTs) and reducing installation complexity.

    Extended Measurement Range (With CT)

    0 ~ 9999 A AC — For high-current single-phase AC system monitoring (e.g., large industrial motors, welding equipment, distribution feeder currents), the ammeter integrates with a current transformer (CT) rated for a standard secondary output of 5 A AC. The primary current range is defined by the CT ratio (e.g., 100 A/5 A, 500 A/5 A, 1000 A/5 A). The CT isolates the ammeter from high primary currents, preventing overload damage.

    3.2 Core Measurement Features
    • Accurate RMS current measurement — with support for configurable display scaling to match CT ratios for direct primary current indication.
    • Overcurrent alarm function to notify users of excessive current draw, helping to prevent equipment overheating and damage.
    • Compatibility with standard CT models, enabling easy system expansion and retrofitting.

    Technical Parameters

    📱 Scroll horizontally to view the full table.

    Function & Shape / Model Measure & Display Shape Code (Figure Inside □) Selected Additional Functions
    Current Voltage Frequency ⑨ ⑧ 7 5 ④ Communication Interface: RS485 2-Channels Switch Output 1-Channel Analog Output
    96×96 80×80 72×72 96×48 48×48
    SFS-□K1-I ● √ √
    SFS-□K1-U ● √ √ √
    SFS-□K1-F ● √ √ √
    SFN-□K1-I ● √ √ √ √ √
    SFN-□K1-U ● √ V √ √ √
    SFN-□K1-F ● V √ √ √ √
    SFN-□K1-I+RS ● √ V √ √ 十
    SFN-□K1-U+RS ● √ √ √ √ +
    SFN-□K1-F+RS ● V √ √ √ 十
    SFN-□K1-I+2DO ● √ √ √ √ 十
    SFN-□K1-U+2DO ● √ √ √ √ 十
    SFN-□K1-F+2DO ● √ √ √ √ 十
    SFN-□K1-I+1AO ● √ V √ √ 十
    SFN-□K1-U+1A0 ● √ √ √ √ 十
    SFN-□K1-F+1AO ● √ √ √ √ +

    Frequently Asked Questions (FAQ)

    Q What is the difference between the SFS and SFN series models?
    The SFS series models support fewer panel size options (96×96 and 72×72 only), while the SFN series supports a wider range of enclosure sizes including 96×96, 80×80, 72×72, 96×48, and 48×48. The SFN series also supports optional add-on functions such as RS485 communication, 2-channel switch output (2DO), and 1-channel analog output (1AO), making it more suitable for advanced monitoring and automation applications.
    Q Do I need a voltage transformer (PT) to measure high-voltage AC systems above 600 V?
    Yes. For voltages exceeding 600 V AC, a voltage transformer (PT) is required. The PT steps down the primary high voltage to a standard secondary output of 100 V AC, which the voltmeter can safely measure. The PT ratio determines the actual primary voltage range — for example, a 110 kV/100 V PT allows measurement of up to 110 kV. This configuration also provides galvanic isolation, ensuring operator safety.
    Q Can the digital AC ammeter measure currents above 10 A without a current transformer?
    No. The direct measurement range of the digital AC ammeter is limited to 0 ~ 10 A AC. For currents exceeding 10 A, an external current transformer (CT) with a standard secondary output of 5 A is required. The CT ratio (e.g., 100 A/5 A, 1000 A/5 A) defines the maximum measurable primary current, which can extend up to 9999 A AC.
    Q What does True RMS measurement mean, and why is it important?
    True RMS (Root Mean Square) measurement calculates the actual effective value of an AC signal, regardless of its waveform shape. This is especially important in modern electrical systems where non-linear loads — such as variable frequency drives, switching power supplies, and LED lighting — cause waveform distortion. A True RMS meter ensures accurate readings under these conditions, whereas average-responding meters may produce significant errors.
    Q Is the digital DC voltmeter suitable for solar PV system monitoring?
    Yes. The digital DC voltmeter with a direct measurement range of 0 ~ 600 V DC is well-suited for solar PV system output monitoring. It features high-precision linear measurement with minimal drift, making it reliable for both steady-state and fluctuating DC voltage levels typical of photovoltaic installations. The polarity reversal protection also adds an extra layer of safety during installation.
    Q What optional communication and output functions are available, and how do I select the right model?
    The SFN series meters offer three optional add-on functions: RS485 communication interface (for remote monitoring via Modbus or similar protocols), 2-channel switch output (2DO, for alarm or relay control), and 1-channel analog output (1AO, for integration with SCADA or PLC systems). To select the correct model, identify your measurement type (Current = I, Voltage = U, Frequency = F), the required panel size (shape code), and append the desired option suffix — for example, SFN-□K1-U+RS for a voltage meter with RS485 communication.