Zeenko tinyGTC ZC412 Frequency Counter/Timer User Manual

1. Introduction

The Zeenko tinyGTC ZC412 is a handheld, high-accuracy frequency counter and timer designed for versatile measurement applications. Its portable nature and high time resolution of 40 ps ensure highly accurate measurement results. The device offers a wide range of functions, including frequency, time, phase, and gapless interval counting, which provides reliable results for ADEV (Allan Deviation) measurements.

A key feature of the tinyGTC ZC412 is its built-in GNSS Disciplined Oscillator (GPSDO), allowing the internal clock to be synchronized to a GPS time signal (UTC) for high long-term accuracy. The device features a clear 4-inch touchscreen for intuitive operation and a USB interface for remote control and data readout. It also includes a micro SD card slot, supporting cards up to 32GB for storing measurement data.

Please note that due to its compact size and cost-effective design, the tinyGTC ZC412 is not as robustly protected against overloading as larger, more expensive professional counters. Exercise caution with input signals.

Figure 1: Zeenko tinyGTC ZC412 with key features highlighted, including 12GHz frequency counting, 40ps resolution, GNSSDO, 4-inch display, and 4000mAh battery.

2. Package Contents

Upon unpacking your tinyGTC ZC412, please verify that all items listed below are present and in good condition:

• Zeenko tinyGTC ZC412 Frequency Counter/Timer Unit
• GPS Antenna
• USB Cable
• RF Cables (quantity may vary)
• User Manual (this document)

Figure 2: The tinyGTC ZC412 frequency counter and its included accessories.

3. Device Overview

3.1 Front Panel

Figure 3: Front view of the tinyGTC ZC412, featuring the 4-inch touchscreen display.

The front panel primarily features the 4-inch color touchscreen display, which serves as the main interface for all operations and data visualization.

3.2 Top Panel Connectors

Figure 4: Top panel connectors of the tinyGTC ZC412.

• OUT: GNSSDO output (adjustable 8kHz ~ 150MHz).
• REF: External reference clock input.
• GNSS: Connector for the GPS antenna.
• A: Input channel A for frequency/time measurements (0.1Hz to 300MHz DC coupled).
• B: Input channel B for frequency/time measurements (200MHz to 12.8GHz RF).

3.3 Rear Panel

Figure 5: Rear panel of the tinyGTC ZC412 with product information and warnings.

The rear panel provides product identification, specifications, power input, and important safety warnings. It includes the model number (ZC412), frequency ranges, resolution, power requirements (5V USB, 1.3A Max), hardware version, serial number, and CE/FCC certifications. A QR code links to the official tinyGTC wiki page for detailed information.

WARNING: AVOID STATIC DISCHARGE. Handle with care to prevent damage to sensitive electronic components.

4. Setup and Initial Operation

4.1 Powering On the Device

1. Connect the provided USB cable to the USB port on the tinyGTC ZC412 (located on the side) and to a 5V USB power source (e.g., a computer USB port or a USB wall adapter). The device requires a maximum of 1.3A.
2. The device should power on automatically. If not, locate the power button (usually on the side) and press it.

4.2 Connecting the GPS Antenna

1. Connect the supplied GPS antenna to the 'GNSS' connector on the top panel of the tinyGTC ZC412.
2. Place the GPS antenna in a location with a clear view of the sky to ensure optimal satellite reception. This is crucial for the GPSDO functionality and accurate time synchronization.

4.3 Basic Frequency Measurement

1. Connect the signal to be measured to either input 'A' (for 0.1Hz to 300MHz, DC coupled) or input 'B' (for 200MHz to 12.8GHz RF). Use appropriate RF cables.
2. On the 4-inch touchscreen, navigate to the frequency measurement mode.
3. Observe the frequency reading on the display. Adjust settings like trigger level via the touchscreen interface as needed for stable readings.

5. Operating Instructions

5.1 Touchscreen Interface

The 4-inch touchscreen is the primary control interface. Tap icons and menus to select measurement modes, adjust parameters, and view results. The display shows real-time data, status indicators (e.g., GPS lock, battery level), and settings.

5.2 Measurement Modes

• Frequency: Measures the frequency of input signals on channels A or B.
• Time: Measures time intervals between events.
• Phase: Measures the phase difference between two signals.
• Count: Counts events over a specified period.
• ADEV (Allan Deviation): Utilizes gapless interval measurements to provide reliable Allan Deviation results, crucial for characterizing oscillator stability.

5.3 GNSSDO Operation

Once the GPS antenna is connected and has a clear sky view, the tinyGTC ZC412 will attempt to acquire a GPS lock. A status indicator on the display will show the GPS lock status. Once locked, the internal oscillator will be disciplined to the GPS time signal, providing highly accurate and stable frequency references.

5.4 External Reference Clock

The 'REF' input allows for an external reference clock to be used instead of or in conjunction with the internal GPSDO. Connect your external reference signal to this port. The device's settings will allow you to select the reference source.

5.5 Data Logging and SCPI Control

• SD Card: Insert a micro SD card (up to 32GB) into the designated slot. The device can log measurement data directly to the card. Refer to the on-screen menus for data logging options and file formats.
• USB SCPI: Connect the tinyGTC ZC412 to a computer via the USB port. The device supports Standard Commands for Programmable Instruments (SCPI), allowing for remote control and automated data acquisition using compatible software or programming languages. Consult the tinyGTC wiki for detailed SCPI command sets.

6. Maintenance

6.1 Cleaning

• Gently wipe the device's exterior with a soft, dry, lint-free cloth.
• For stubborn dirt, slightly dampen the cloth with water or a mild, non-abrasive cleaner.
• Do NOT use harsh chemicals, solvents, or abrasive materials, as these can damage the display or casing.
• Ensure no liquid enters the ports or openings.

6.2 Battery Care

The tinyGTC ZC412 includes a 4000mAh internal battery. To maximize battery life:

• Avoid fully discharging the battery frequently.
• Store the device in a cool, dry place when not in use for extended periods.
• If storing for a long time, charge the battery to approximately 50-70% capacity.

6.3 Firmware Updates

Periodically check the official tinyGTC wiki page (https://tinydevices.org/) for available firmware updates. Firmware updates can introduce new features, improve performance, or fix bugs. Follow the instructions provided on the wiki carefully when performing updates.

7. Troubleshooting

7.1 No Power/Device Not Turning On

• Ensure the USB cable is securely connected to both the device and a working 5V USB power source.
• Verify the power source is providing sufficient current (up to 1.3A).
• If using battery power, ensure the battery is charged.

7.2 No GPS Lock

• Ensure the GPS antenna is securely connected to the 'GNSS' port.
• Relocate the GPS antenna to an outdoor area with an unobstructed view of the sky.
• Avoid placing the antenna near large metal objects or strong RF interference sources.

7.3 Unstable Frequency Readings

• Check the input signal level. Ensure it is within the device's specified input range.
• Adjust the trigger level settings on the touchscreen.
• Verify cable connections are secure and free from damage.
• Ensure the correct input channel (A or B) is selected for the signal frequency.

7.4 Overload Warning

If an overload warning appears, immediately disconnect the input signal. The tinyGTC ZC412 is sensitive to high input power. Reduce the input signal level before reconnecting.

8. Specifications

9. User Tips

• Input Protection: Always be mindful of the input signal levels. The tinyGTC ZC412 is a sensitive instrument; avoid applying signals that exceed its specified maximum input power to prevent damage.
• GPS Antenna Placement: For optimal GPSDO performance, ensure the GPS antenna has a clear, unobstructed view of the sky. Indoor use or placement near large structures can degrade signal reception and GPS lock stability.
• SCPI Commands: For advanced users, leveraging the SCPI command set via USB can greatly enhance automation and data collection capabilities. Refer to the official tinyGTC wiki for detailed documentation.
• SD Card Usage: Regularly back up data from your micro SD card to prevent loss. Format the card periodically if you experience any data logging issues.

10. Warranty and Support

For detailed warranty information, technical support, and the most up-to-date documentation, please refer to the official tinyGTC wiki page:

https://tinydevices.org/

This resource is maintained by the developer and provides comprehensive information, including specifications, usage guides, and potential firmware updates.