1. Introduction
The Seesii TinyGTC ZC407 is a handheld frequency counter designed for precise data acquisition in RF development and frequency calibration. It features an ultra-wide frequency range from 0.1 Hz to 7 GHz, a built-in GNSS/GPS disciplined oscillator (GPSDO) for enhanced measurement accuracy, and a 4.0-inch HD touchscreen for intuitive operation. The device also includes a Micro SD card slot, supporting up to 32GB, for comprehensive data handling and storage.
This frequency counter is capable of measuring both ultra-low and high frequencies, making it suitable for diverse testing needs, from audio signals to mainstream wireless communications. Its dual-channel design allows for simultaneous measurements, improving efficiency and reducing potential errors in various applications, including interference troubleshooting and amplifier gain measurement.
Figure 1.1: The TinyGTC ZC407 offers a broad frequency measurement range from 0.1 Hz to 7 GHz.
Video 1.1: An overview demonstrating the 7GHz ultra-range capabilities of the SeeSii ZC407 tinyGTC Frequency Counter.
2. Setup
2.1. Unpacking and Component Identification
Carefully unpack all components from the box. Verify that all items listed in the "Package Contents" section are present and undamaged. Familiarize yourself with the device's ports and controls.
Figure 2.1: Included items in the product package.
2.2. Connecting Peripherals
- GPS Antenna: Connect the provided GPS antenna to the GNSS port on the device. Ensure the antenna has a clear view of the sky for optimal signal reception.
- SMA Cables: Use the SMA cables to connect your signal sources to Input A and Input B for dual-channel measurements.
- USB-C Cable: Connect the USB-C cable for charging the device or for data transfer and remote control via a PC.
- Micro SD Card: The 32GB Micro SD card is pre-installed. Ensure it is properly seated in the SD card slot for data storage.
Figure 2.2: Overview of device ports and controls.
2.3. Powering On
Press and hold the On/Off button to power on the device. The 4.0-inch HD touchscreen will illuminate, displaying the main measurement interface.
3. Operating Instructions
3.1. Basic Navigation and Display
The device features a 4.0-inch HD touchscreen for interactive control. Navigate through menus and settings by tapping on the screen or using the multi-functional knob. The display provides real-time measurement data, including frequency, time, and phase.
Figure 3.1: The 4-inch touchscreen provides clear visual feedback and responsive control.
3.2. Dual-Channel Measurement
The TinyGTC ZC407 is equipped with two independent input channels, Channel A and Channel B. This allows for simultaneous measurement and comparison of two different signals. Channel A supports a frequency range of 0.1Hz–350MHz, extendable to 7GHz/12GHz with a GHz prescaler. Channel B operates similarly to Channel A but without the GHz prescaler function. This feature is beneficial for applications requiring comparative analysis, such as interference troubleshooting or amplifier gain measurement.
Figure 3.2: Dual-channel measurement setup for simultaneous testing.
3.3. High-Precision Measurements
The device features two independent counter/timers with 40 ps resolution, enabling gapless time, frequency, and phase measurements. Advanced reciprocal counting and ADEV stability contribute to a frequency-independent accuracy of 1e-11~1e-12 per second. This precision is suitable for laboratory-grade applications, including TDR, pulse analysis, and long-term stability testing.
Figure 3.3: High-precision frequency counting with 40ps resolution.
Video 3.1: Demonstration of the SeeSii ZC407 tinyGTC Frequency Counter's operation and performance.
Video 3.2: Detailed explanation of the tinyGTC's measurement and display capabilities.
3.4. GPS Synchronized Internal Clock (GPSDO)
The integrated GNSS/GPSDO locks to GPS UTC, providing continuous calibration and long-term high precision. This disciplined oscillator delivers stable frequencies (8kHz–150MHz) as a clock source and can accept external references, including atomic clocks, to leverage its 12-bit resolution. This feature is crucial for precision timing in communication base station testing, distributed sensor networks, and field research.
Figure 3.4: GPS-synchronized clock for UTC calibration and high-precision long-term tests.
Video 3.3: A demonstration on how to enable and check the lock status of the tinyGTC GPSDO.
Video 3.4: Demonstration of tinyGTC clock output modes and their limitations.
3.5. PC Control and Data Transfer
The TinyGTC ZC407 supports real-time data display and transmission to a PC via its built-in USB port. This allows for remote control of the device and direct access to measurement data, facilitating advanced analysis and integration into larger test setups. The device is compatible with up to 32GB MicroSD cards for efficient data storage and sharing, which is useful for spectrum scanning, signal detection, and radio noise measurement.
Figure 3.5: Remote control and monitoring via USB connection to a PC.
4. Maintenance
4.1. Battery Charging
The device includes a built-in 4000mAh battery, providing up to 5 hours of continuous operation. To charge the battery, connect the device to a power source using the provided USB-C charging cable. The charging status will be indicated on the screen.
Figure 4.1: The device features a 4000mAh rechargeable battery with USB-C charging.
4.2. Micro SD Card Management
The device supports Micro SD cards up to 32GB for storing measurement data. Regularly back up important data to a computer and ensure sufficient free space on the card for continuous recording. To remove the Micro SD card, gently push it inward until it clicks, then release to eject.
4.3. Cleaning
To clean the device, use a soft, dry cloth. Avoid using abrasive cleaners or solvents, which can damage the screen or casing. Keep the ports free of dust and debris.
5. Troubleshooting
- Device does not power on: Ensure the battery is charged. Connect the device to a power source using the USB-C cable and attempt to power on again.
- No signal detected: Verify that the SMA cables are securely connected to both the device and the signal source. Check the input settings on the device to ensure the correct channel is selected and configured.
- Inaccurate measurements: Ensure the GPS antenna has a clear view of the sky for optimal GPSDO performance. Check for any external interference that might affect signal integrity. Perform a self-test if available in the device menu.
- Touchscreen unresponsive: Try restarting the device. If the issue persists, ensure the screen is clean and free from moisture or debris.
6. Specifications
| Feature | Specification |
|---|---|
| Model Number | ZC407 |
| Frequency Range | 0.1 Hz - 7 GHz |
| Resolution | 40 ps (time/frequency) |
| Accuracy | 1e-11~1e-12 per second (frequency-independent ADEV stability) |
| Input Channels | Dual (A & B) |
| GPSDO | Built-in GNSS/GPS Disciplined Oscillator, locks to GPS UTC |
| Clock Source Output | 8kHz–150MHz |
| Screen Size | 4.0 inches HD Touchscreen |
| Battery Capacity | 4000mAh |
| Battery Life | Up to 5 hours |
| Charging Port | USB-C |
| Data Storage | Micro SD card slot (supports up to 32GB, pre-installed) |
| Connectivity | USB for PC control and data transfer |
| Material | Plastic |
| Color | Black |
7. Package Contents
The following items are included in your SEESII TinyGTC ZC407 package:
- 1 x Frequency Counter (Built-in 4000mAh Battery, 4-inch Touchscreen)
- 1 x USB Charging Cable
- 1 x T-Type Adapter
- 2 x SMA Cables
- 1 x GPS Antenna
- 1 x 32GB Memory Card (Pre-installed)
- 1 x Wrist Strap with Touch Stylus
- 1 x Extra Touch Stylus
8. Warranty and Support
The SEESII TinyGTC ZC407 Frequency Counter comes with a 36-month warranty, ensuring long-term reliability and peace of mind. For any technical assistance, inquiries, or support needs, our customer service team is available to provide a quick response within 24 hours.
Please refer to the official Seesii website or your purchase documentation for detailed warranty terms and contact information for support.
