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HF-GT-207 Frequency Selective Voltmeter
This Frequency Selective Voltmeter can accurately extract and measure voltage signals at specified frequencies while effectively filtering out unwanted interference signals. It is widely used for harmonic detection, carrier signal testing and electrical parameter measurement in power systems.
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Product Introduction
Model HF-GT-207 works in conjunction with Grounding Grid Resistance Tester for anti-interference measurement of surface potential gradient, step voltage and touch voltage.
During measurement, the main unit outputs constant variable-frequency current to the grounding device; AI-7301 detects signals at the specific frequency so as to filter out power frequency interference.
- Equipped with frequency-selective voltage measurement function for surface potential gradient testing.
- Built-in human body analog resistor for step voltage and touch voltage measurement.
- External current clamp or Rogowski coil can be connected to realize frequency-selective current measurement.
- User-friendly operation with abundant data functions.
- The instrument is fitted with rechargeable battery, calendar clock and built-in mini printer. It can store up to 1000 measurement records and support data transmission to PC for further processing.
Product Features
Compliant with Industry Standards
It fully complies with DL/T475-2017 Guide for Measurement of Parameters of Grounding Devices. Paired with AI-6301S/6312 Automatic Anti-interference Grounding Resistance Tester, it satisfies all test requirements specified in the guideline. Compact and lightweight design greatly reduces workload for field testing personnel.
Outstanding Anti-interference Performance
Adopting high-precision adaptive digital notch filtering technology, the instrument automatically tracks and suppresses interference frequencies, with theoretical interference rejection ratio up to one million times.
Stable & Reliable Performance
Designed with high-speed microprocessor for steady operation. Large backlit LCD display ensures clear reading both day and night. Only 4 operation keys with simplified menu layout for effortless manipulation.
Technical Specifications
| Item | Parameter |
|---|---|
| Measuring Range | 0 ~ 600 V |
| Accuracy | ±(1% of reading + 0.1 mV) |
| Max Resolution | 0.001 mV |
| Input Impedance | > 500 kΩ |
| Built-in Human Body Analog Resistance | 1500 Ω ±5% |
| Overall Dimension | 330×285×135 mm (L×W×H) |
| Weight | 3 kg (excluding cable case) |
| Selectable Measuring Frequencies | 45/47.5/50/52.5/55/57.5/60/62.5/65 Hz |
| Interference Tracking Range | ±0.75 Hz |
| Interference Rejection Ratio | ≥ 80 dB |
| Continuous Battery Working Time | Approx. 8 hours |
| Charging Power Supply | 220V±10%, 50Hz / 60Hz |
| Charging Duration | Approx. 5 hours |
| Wireless Transmission Distance | ≥ 500 m |
Packing List
| No. | Item Description | Quantity | Unit | Remarks |
|---|---|---|---|---|
| 1 | AI-7301 Frequency Selective Voltmeter Main Unit | 1 | Set | Built-in rechargeable battery |
| 2 | Measuring Test Leads & Connecting Cables | 1 | Set | For potential gradient, step & touch voltage test |
| 3 | Current Clamp / Rogowski Coil | 1 | Piece | Optional for frequency-selective current measurement |
| 4 | AC Power Charger | 1 | Pcs | 220V input for battery charging |
| 5 | USB Data Transmission Cable | 1 | Pcs | Upload stored data to computer |
| 6 | Thermal Printing Paper Rolls | 2 | Rolls | For built-in miniature printer |
| 7 | Shockproof Portable Carrying Case | 1 | Pcs | Storage and field carrying |
| 8 | English User Operation Manual | 1 | Copy | Complete operation & parameter guidance |
| 9 | Factory Calibration Certificate | 1 | Copy | Metrological calibration report |
| 10 | CD with Upper Computer Analysis Software | 1 | Piece | Data processing, storage & report printing |
FAQ for Frequency Selective Voltmeter
1. What is the main purpose of this frequency selective voltmeter?
It is matched with grounding grid resistance testers to measure surface potential gradient, step voltage and touch voltage of grounding systems. It eliminates strong power frequency interference via frequency selection technology for accurate field grounding tests.
2. How does it suppress on-site power frequency interference effectively?
It adopts high-precision adaptive digital notch filtering technology, automatically tracks interfering frequencies within ±0.75Hz, with interference rejection ratio ≥80dB, greatly shielding industrial electromagnetic disturbances.
3. What built-in configuration supports step voltage & touch voltage tests?
It is equipped with a built-in 1500Ω human body analog resistor (tolerance ±5%), which fully simulates human body resistance in accordance with national power industry test standards.
4. Can this instrument measure frequency-selective current besides voltage?
Yes. By connecting an external current clamp or Rogowski coil, it can realize frequency-selective current synchronous measurement to enrich grounding test items.
5. Which industry standard does the instrument comply with?
It strictly conforms to DL/T475-2017 Guide for Measurement of Parameters of Grounding Devices, and meets all test requirements specified in this regulation when paired with AI-6301S/6312 grounding resistance tester.
6. What data storage and output functions are available?
It can store up to 1000 groups of measurement data. It supports built-in mini thermal printing, and data can be uploaded to a computer via USB for viewing, analyzing and generating test reports.
7. How long is the continuous battery working time?
The built-in rechargeable battery supports around 8 hours of continuous field measurement; full charging takes approximately 5 hours with 220V mains supply.
8. Is the display clear for outdoor day and night use?
It features a large backlit LCD screen. Readings can be viewed clearly under strong sunlight and dim dark environments. Only four keys simplify field operation.
9. What voltage measuring range and resolution does it have?
Measuring range: 0~600V; maximum resolution up to 0.001mV, with high voltage testing accuracy suitable for tiny potential difference detection on the ground surface.
10. What optional frequencies can be selected for testing?
Optional frequencies: 45/47.5/50/52.5/55/57.5/60/62.5/65Hz, adaptable to power grids with different frequency standards worldwide.
11. What is the wireless transmission distance between the paired host devices?
The wireless communication distance reaches more than 500 meters, suitable for large-scale substation grounding grid long-distance layout testing.
12. What are the overall size and weight, convenient for field carrying?
Dimension: 330×285×135mm, net weight only 3kg (without cable case). Lightweight design reduces labor intensity for field inspectors.
13. Does the instrument need regular calibration?
Yes. Periodic metrological calibration is recommended to maintain long-term measurement precision. Each unit is delivered with an official factory calibration certificate.
14. What occasions is this instrument widely applied to?
Power substations, hydropower plants, photovoltaic power stations, petrochemical plants, railway power systems and lightning protection inspection institutions for annual grounding grid performance acceptance & detection.
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