ZMPT101B Single-Phase AC Voltage Sensor Module – Adjustable Analog Output

The ZMPT101B AC Voltage Sensor Module is designed for measuring single-phase AC voltage and providing an isolated analog signal that can be read by a microcontroller or ADC.

The module combines a ZMPT101B precision voltage transformer with an onboard signal-conditioning amplifier. This provides galvanic isolation between the measured AC circuit and the low-voltage measurement side while allowing the output amplitude to be adjusted using the onboard potentiometer.

It is ideal for Arduino, ESP32 with suitable ADC-level consideration, energy monitoring, smart meters, power measurement, home automation, and industrial monitoring projects.

Technical Specifications

• Model: ZMPT101B
• Sensor Type: Single-Phase AC Voltage Sensor
• Measurement Type: AC Voltage
• Maximum Module Measurement Voltage: Up to 250V AC as commonly specified
• Frequency: Suitable for 50/60Hz AC Measurement
• Sensor Element: ZMPT101B Precision Voltage Transformer
• Rated Transformer Input Current: 2mA
• Rated Transformer Output Current: 2mA
• Transformer Ratio: 1000:1000
• Output Type: Analog
• Output Amplitude: Adjustable
• Output Adjustment: Onboard Multi-Turn Potentiometer
• Signal Conditioning: Onboard Operational Amplifier Circuit
• Transformer Isolation Withstand Voltage: Up to 4000V as specified
• Transformer Linearity: ≤0.2% under specified conditions
• Module Dimensions: Approx. 49.5 × 19.4mm for the common board version
• Application: AC Voltage Measurement and Monitoring

Adjustable Analog Output

The ZMPT101B transformer converts the mains AC voltage into a much smaller isolated AC signal. The onboard amplifier conditions this signal so that it can be measured by a microcontroller's analog-to-digital converter.

The onboard potentiometer allows the output amplitude to be adjusted to suit the ADC input range of the connected controller.

Software can then sample the AC waveform and calculate parameters such as RMS voltage after proper calibration.

Microcontroller Applications

The module can be used with controllers such as Arduino and other ADC-equipped microcontrollers.

When using an ESP32 or another 3.3V ADC, the output must be adjusted and verified so that it never exceeds the controller's permitted analog-input voltage.

Calibration against a reliable AC voltmeter is recommended when accurate voltage measurements are required.

Applications

Ideal for AC voltage monitoring, smart energy meters, power monitoring systems, home automation, electrical measurement projects, power-quality experiments, industrial monitoring, over/undervoltage monitoring systems, educational electronics, and IoT energy projects.

When combined with a suitable current sensor, the ZMPT101B can also form part of a system for measuring and analyzing AC electrical power.

Important Note

The ZMPT101B module provides an analog representation of the AC waveform. It does not directly output the AC voltage as a ready-to-use numerical value.

The microcontroller must sample the waveform and perform the required calculations and calibration to determine the actual AC RMS voltage.

Also note that specifications for the bare ZMPT101B transformer and complete ZMPT101B sensor module are not identical. The transformer itself has a wider specified linear operating range, while common assembled modules are generally intended for measuring AC mains voltage up to approximately 250V.

Safety Warning

Although the ZMPT101B transformer provides galvanic isolation, the input side of the module is connected directly to potentially lethal AC mains voltage.

Do not touch the input terminals, PCB tracks, or high-voltage components while the circuit is powered.

Use an appropriate insulated enclosure, correctly rated wiring, fusing, electrical clearances, and safe installation practices. Always disconnect mains power before wiring or adjusting the module.

Package Includes

1 × ZMPT101B Single-Phase AC Voltage Sensor Module