HZDW-FB Large Ground Network Grounding Resistance Meter

1. Instrument Overview

The frequency selective voltmeter is designed for use with a large ground network grounding resistance meter to measure surface potential gradient, step voltage, and potential difference with strong anti-interference capability. During measurement, the earth network grounding resistance meter outputs a constant frequency current to the grounding device, and the frequency selective voltmeter detects that frequency, effectively filtering out power frequency interference. The instrument also has voltage measurement capability for measuring surface potential gradient. External human body resistance is used for measuring step voltage and contact voltage. The instrument is equipped with a rechargeable battery.

2. Features

Strong Anti-Interference Capability: Utilizes high-precision adaptive digital notch technology that automatically tracks and suppresses interference frequencies. The theoretical suppression of this algorithm approaches one part per million. Compared to some imported selective frequency voltmeters with suppression capabilities of only several percent, this instrument can virtually ignore the presence of interference.

Powerful Functions: Capable of measuring step voltage, contact voltage, transfer potential, potential gradient, and other parameters.

Full Touch LCD Display: Extra-large graphic operation interface makes every step of the process clear and intuitive. Operators do not need additional professional training - simply touch the screen to complete the entire testing process.

Built-in Calendar and Memory: Equipped with a calendar chip and large-capacity memory, the instrument can save measurement results at any time. Historical records can be viewed at any time, and both current time and storage time can be displayed and printed.

Scientific Advanced Data Management: Instrument data can be exported via USB flash drive. Data can be viewed and managed on any PC using dedicated software, with the ability to generate reports and test reports.

Easy Operation: The measurement process is controlled by a microprocessor. Once the correct measurement mode is selected, the measurement is automatically completed under microprocessor control.

3. Technical Specifications

3.1 Technical Parameters

Voltage Measurement Range: 0–200 V; Resolution: 0.001 mV; Error: ± (reading × 2% + 0.1 mV)

Current Measurement Range: 0–20 A; Resolution: 0.001 A; Error: ± (reading × 2% + 0.01 A) (Reserved function)

Frequency Selection Range: Any frequency within 40–70 Hz can be measured.

Input Impedance: >500 kΩ

Human Body Resistance: 1500 Ω ± 5%

Power Frequency Rejection Ratio: ≥60 dB (anti-power frequency 50 Hz voltage interference capability: 100 V)

Battery Working Time: Approximately 8–12 hours

Charging Time: Approximately 3 hours

Charging Power Supply: AC 220 V ±10%, 50 Hz / 60 Hz

Dimensions: 320 mm × 275 mm × 140 mm