1. Introduction
The HTOOL GS320 Vector Network Analyzer (VNA) is a handheld reflectometer designed for measuring the matching characteristics of passive and active radio equipment, including antennas, cables, filters, attenuators, and amplifiers. It operates across a wide frequency range of 23 MHz to 6200 MHz, making it suitable for various applications such as Bluetooth, Wi-Fi, 2.4G, 5.8G, GPS, BeiDou, Internet of Things (IoT) devices, and security product RF circuit debugging.
This device allows for the measurement of complex reflection coefficients, Standing Wave Ratio (VSWR), impedance, conductance, amplitude, phase, loss, and distance to cable failure points. Its compact, lightweight design and built-in battery make it ideal for field measurements.
2. Package Contents
The standard package for the GS320 VNA includes the following items:
- GS320 Host Unit (1)
- SMA OPEN (1)
- 50Ω LOAD (1)
- SMA SHORT (1)
- Resistive Touch Pen (1)
- USB Type-C Data Cable (1)
The HT5 Logarithmic Periodic Antenna, if purchased separately or as part of a bundle, includes:
- HT5 Logarithmic Periodic Directional Antenna (1)
- Connecting Cable (1)
- SMA Adapter (1)
3. Setup
3.1 Powering the Device
The GS320 VNA features a built-in 4000 mAh battery, providing approximately 4 hours of working time on a full charge. To charge the device, connect it to a power source using the provided USB Type-C data cable. A full charge typically takes about 6 hours. The device can also be powered from a tablet or smartphone via the Type-C USB cable, ensuring continuous operation.
3.2 Initial Calibration
The device is factory calibrated, using its internal connector as a reference. However, for accurate measurements involving external cable assemblies, adapters, or other components, recalibration is essential. Use the provided 50-ohm calibration kit (SOL: Short, Open, Load) for this purpose. Ensure the calibration kit's form factor (e.g., N-type, SMA-type) matches the connector type at your measurement reference point.
Before performing any measurements, warm up the unit for at least five minutes after a complete single-port calibration (short-circuit, disconnect, load). Maintain a stable ambient temperature, as changes exceeding ±3°C between calibration and measurement can affect accuracy.
Video 1: Demonstration of the calibration process for the GS320 VNA.
4. Operating Instructions
The GS320 VNA allows for comprehensive RF analysis. The device features a 3.2-inch resistive touchscreen (320x240 resolution) and physical buttons for navigation and control.
4.1 Basic Measurements
The VNA can measure various parameters, including:
- Complex reflection coefficient
- Standing Wave Ratio (VSWR)
- Impedance
- Conductance
- Amplitude
- Phase
- Loss
- Distance to cable failure
You can visualize these parameters through various display graphs:
- Smith's circle diagram for impedance matching
- Polar plot of reflection coefficients in phase
- Magnitude and logarithmic amplitude plots
- VSWR plots
- Distance to fault plots
- Cable loss plots
4.2 Using the HT5 Logarithmic Periodic Antenna
The HT5 logarithmic periodic antenna is designed for a wide frequency range (1300MHz to 10GHz) with a gain of 6-9dBi. It is suitable for applications such as Beidou GPS, 2.4GHz, 5.8GHz, microwave darkroom testing, signal analysis, positioning, and lateralization.
To use the HT5 antenna, connect it to the GS320 VNA using the provided cable and SMA adapter. Ensure all connections are secure before taking measurements.
4.3 PC Software Control
The GS320 VNA supports control via PC software, which can be obtained from distributors. This allows for more advanced analysis and data logging capabilities.
5. Maintenance
5.1 Battery Care
To prolong the life of the built-in 4000 mAh battery, avoid fully discharging it frequently. Recharge the device when the battery level is low. Store the device in a cool, dry place when not in use for extended periods.
5.2 Cleaning
Gently wipe the device's screen and body with a soft, dry cloth. Do not use abrasive cleaners or solvents, as these may damage the device's surface or screen.
6. Troubleshooting
6.1 Inaccurate Measurements
- Calibration: Ensure the device has been properly calibrated using the SOL calibration kit, especially when using external cables or adapters. Recalibration is necessary if the measurement setup changes.
- Warm-up Time: Allow the unit to warm up for at least five minutes after calibration before taking measurements.
- Temperature Stability: Avoid significant changes in ambient temperature (more than ±3°C) between calibration and measurement, as this can affect accuracy.
6.2 Cable Fault Detection Limitations
The resolution for determining the distance to a fault point is dependent on the speed of light (C), velocity factor (VF) of the cable, and the scanning frequency range (S). The maximum measurable cable length is 3000 meters (with VF=1), but this limit can be reduced by the amount of attenuation in the cable.
7. Specifications
7.1 GS320 Vector Network Analyzer
| Parameter | Value |
|---|---|
| Operating Frequency Range | 23-6200 MHz |
| Frequency Resolution | 10 kHz |
| Maximum Number of Scanning Points | 1000 |
| Scanning Speed | 1000 points/sec |
| Bridge Orientation (uncorrected) | > 12 dB |
| Effective Directivity (after full single-port calibration) | > 50 dB |
| VSWR at Input | < 2 |
| Phase Measurement Accuracy | > 1.50 |
| Amplitude Measurement Accuracy | > 0.25 dB |
| Maximum DC Input Voltage | 25 V |
| Operating Temperature Range | 0 ... +40°C |
| Screen Diagonal | 3.2 inches |
| Screen Type | Resistive |
| Screen Resolution | 320x240 |
| Battery Capacity | 4000 mAh |
| Battery Life | ~ 4 hours |
| Battery Charging Time | ~ 6 hours |
| External Dimensions (L×W×H) | 145×72×24 mm |
| Weight | 0.48 kg |
7.2 HT5 Logarithmic Periodic Antenna
| Parameter | Value |
|---|---|
| Frequency Range | 1300 MHz - 10 GHz |
| Directional Gain | 6-9 dBi |
| Standing Wave Ratio (VSWR) | < 1.5 |
| Impedance | 50 Ω |
| Applications | Beidou GPS, 2.4GHz, 5.8GHz, microwave darkroom testing, signal analysis, positioning, lateralization |
8. User Tips
- VNA vs. Signal Strength Meter: The GS320 VNA is designed to measure the characteristics of RF components (like antennas and cables) to ensure they are properly matched to a system. It is not a signal strength meter and cannot directly measure the strength of a 4G LTE cell signal. For signal strength, a dedicated field strength meter or spectrum analyzer is typically used.
- Consistent Calibration: Always perform a full single-port calibration (Short, Open, Load) when changing measurement setups or if you suspect inaccurate readings.
- Environmental Stability: For the most accurate results, ensure the ambient temperature remains stable during calibration and subsequent measurements.
- PC Software: Utilize the PC software for enhanced analysis, data logging, and potentially more detailed control over the VNA's functions.
9. Warranty and Support
Specific warranty details are not provided in the product description. For warranty information, please contact your retailer or the manufacturer directly.
For technical support, detailed electronic manuals, or PC software, please contact the seller or manufacturer. You may be asked to provide your email address to receive these resources.