1. Introduction
The GVDA GD189 Multi-field EMF Meter is a portable health and safety field detector designed to measure AC magnetic fields, electric fields, and high-frequency (RF) radiation. It is primarily used to detect and evaluate the impact of non-ionizing electromagnetic fields, magnetic fields, and high-frequency radiation in both living and working environments. This device provides a comprehensive assessment of electromagnetic radiation levels, helping users identify potential sources and take necessary precautions.
Figure 1: GVDA GD189 Multi-field EMF Meter
2. Package Contents
Please check the package contents upon receipt to ensure all items are present and undamaged:
- 1 x GVDA GD189 Multi-field EMF Meter
- 1 x Carrying Bag
- 1 x Gift Box
- 1 x User Manual
Figure 2: Package Contents
3. Product Overview
Familiarize yourself with the components and controls of your GD189 EMF Meter:
Figure 3: Product Components
- Radio frequency (RF) receiving antenna
- Electric field receiving antenna
- Magnetic field receiving antenna
- Operational Dynamic Area
- Display screen
- Power switch key
- Data hold button (HOLD)
- Function selection button (FUNC)
- Alarm audio indicator
- Max data key (MAX)
4. Specifications
| Feature | Specification |
|---|---|
| Magnetic Field Measurement | 3-axis |
| Magnetic Measure Range | 0.01~200.0 uT (0.1~2000 mG) |
| Magnetic Range | 20 uT / 200 uT, 200 mG / 2000 mG |
| Magnetic Resolution | 0.01 / 0.1 uT, 0.1 / 1 mG |
| Magnetic Frequency Range | 30~1000 Hz |
| Electric Field Measurement | 1-axis |
| Electric Measure Range | 1~2000 V/m |
| Electric Resolution | 1 V/m |
| Electric Frequency Range | 30~1000 Hz |
| RF Field Measurement | 1-axis |
| RF Measure Range | 0.001~100.0 mW/m² |
| RF Range | 2 / 20 / 100 mW/m² |
| RF Resolution | 0.001 / 0.01 / 0.1 mW/m² |
| RF Frequency Range | 50 MHz~3.5 GHz |
| Alarm | Sound and light (green, orange, red) alarm exceeding built-in threshold |
| Backlight Display | Three-color backlight |
| Auto Power Off | 15 minutes (can be disabled) |
| Low Battery Indication | Yes |
| Operating Environment | 0~40°C / 40~80% RH |
| Power | 3 x 1.5V AAA batteries (not included) |
| Product Size | 142 x 58 x 28 mm |
| Certification | CE |
5. Setup
5.1 Battery Installation
The GVDA GD189 EMF Meter requires 3 x 1.5V AAA batteries (not included) for operation.
- Locate the battery compartment cover on the back of the device.
- Slide or unclip the cover to open the compartment.
- Insert three 1.5V AAA batteries, ensuring correct polarity (+ and -) as indicated inside the compartment.
- Close the battery compartment cover securely.
Figure 4: Battery Installation
6. Operation
6.1 Power On/Off
- To Power On: Press the Power switch key (
). The device will start up and display the current radiation levels. - To Power Off: Press and hold the Power switch key () for a few seconds until the display turns off.
6.2 Measurement Modes
The GD189 EMF Meter can detect three types of fields:
- Magnetic Field (MAG): Measures AC magnetic field radiation in 3-axis mode.
- Electric Field (ELEC): Measures electric field radiation in 1-axis mode.
- High-Frequency (RF): Measures radio frequency/microwave radiation in 1-axis mode.
Press the Function selection key (FUNC) to cycle through the measurement modes (MAG, ELEC, RF).
Figure 5: Multiple Measurement Modes
6.3 Data Hold (HOLD) and Max Hold (MAX)
- Data Hold: Press the HOLD button to freeze the current reading on the display. Press it again to release and resume live measurement.
- Max Hold: Press the MAX button to display the maximum radiation value detected since the device was powered on or the MAX function was reset. Press it again to release.
6.4 Audible and Light Alarm
The device features an audible and light alarm system to indicate radiation levels. The display backlight changes color based on the detected radiation intensity:
- Green: Safe/Low radiation levels.
- Orange: Moderate radiation levels.
- Red: High/Severe radiation levels, accompanied by an audible alarm.
You can toggle the alarm tone on/off using the dedicated alarm audio button.
Figure 6: Three-Color Backlight Display
Alarm Thresholds:
| Field Type | Green (Safe) | Orange (Mid) | Red (Severe) |
|---|---|---|---|
| Magnetic (MAG) | < 0.12 uT (1.2 mG) | < 0.40 uT (4.0 mG) | ≥ 0.40 uT (4.0 mG) |
| Electric (ELEC) | < 40 V/m | < 400 V/m | ≥ 400 V/m |
| RF | < 10 mW/m² | < 50 mW/m² | ≥ 50 mW/m² |
Figure 7: Radiation Levels of Common Electrical Appliances
6.5 Auto Power Off
The device features an automatic power-off function after 15 minutes of inactivity to conserve battery life.
- To Cancel Auto Power Off: Press and hold the HOLD key, then press the Power switch key () to turn on the power. Release the HOLD key. The auto power off symbol on the display will disappear, indicating the function is canceled.
- To Re-enable Auto Power Off: Turn the power off and then on again normally. The auto power off function will resume.
Figure 8: Auto Power Off Feature
6.6 Application Examples
The GD189 EMF Meter can be used in various scenarios to detect radiation:
- Detection of high overhead transmission voltage lines.
- RF radiation detection from Wi-Fi routers and Bluetooth devices.
- EMF radiation detection from refrigerators and other household appliances.
- Radiation detection near signal transmission towers.
- EMF radiation detection in motor vehicles.
- Detection of radiation from computer screens.
Figure 9: Typical Application Scenarios
7. Maintenance
- Cleaning: Use a soft, dry cloth to clean the device. Do not use abrasive cleaners or solvents.
- Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures. If storing for an extended period, remove the batteries to prevent leakage.
- Battery Replacement: Replace batteries promptly when the low battery indicator appears to ensure accurate readings.
8. Troubleshooting
- Device does not power on: Check if the batteries are installed correctly and if they have sufficient charge. Replace with new batteries if necessary.
- Inaccurate readings: Ensure the device is not near strong electromagnetic interference sources that are not being measured. Check battery level.
- No audible alarm: Verify that the alarm tone is enabled using the alarm audio button.
9. Safety Information
- This device is intended for general electromagnetic field detection and evaluation. It is not a medical device and should not be used for diagnostic purposes.
- Keep the device away from water and high humidity.
- Do not attempt to open or modify the device, as this may void the warranty and pose safety risks.
- Dispose of batteries according to local regulations.
- While this meter helps identify radiation, prolonged exposure to high levels of electromagnetic radiation may have health implications. Consult with health professionals for concerns regarding radiation exposure.
Figure 10: Importance of Radiation Awareness
10. Warranty and Support
For warranty information, technical support, or service inquiries, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.