FNIRSI DPOS350P 4-in-1 Tablet Oscilloscope User Manual

1. Introduction and Overview

The FNIRSI DPOS350P is a versatile 4-in-1 portable tablet instrument designed for various electronic testing and measurement applications. It integrates a 350 MHz bandwidth oscilloscope, a 200 KHz - 350 MHz spectrum analyzer, a 100 Hz - 50 MHz frequency response analyzer, and a 0 - 50 MHz DDS signal generator. This manual provides essential information for the safe and effective operation of your device.

Figure 1: Overview of the FNIRSI DPOS350P's integrated functions.

2. Setup

2.1 Initial Charging

Before first use, fully charge the device's integrated 8000 mAh lithium polymer battery using the provided USB-C cable and a compatible power adapter. The charging indicator will show the charging status.

2.2 Power On/Off

Press and hold the power button located on the side of the device to turn it on or off. The device features an automatic power-off function, which can be configured in the system settings, to conserve battery life.

Figure 2: The FNIRSI DPOS350P highlighting its 7-inch IPS touchscreen and 8000mAh battery.

3. Operating Modes

The FNIRSI DPOS350P offers four primary operating modes, accessible via the touchscreen interface.

3.1 Oscilloscope Function

This mode provides a 2-channel digital oscilloscope with a 350 MHz bandwidth and a 1 GSa/s real-time sampling rate. Key features include:

• Bandwidth: 350 MHz
• Sample Rate: 1 GSa/s
• Memory Depth: 47 Kpts
• Resolution: 8-16 bit, adjustable to improve signal clarity and detail.
• Waveform Update Rate: 50,000 wfms/s
• Channels: 2
• Display: 7-inch IPS touchscreen with digital phosphors.
• Modes: X-Y mode for phase comparison.
• Sensitivity: Ultra-sensitive 2 mV/div.
• Measurements: 12 automatic measurements and cursor functions.

Figure 3: Comparison of 8-bit and 16-bit resolution on the oscilloscope, demonstrating enhanced detail.

3.2 Spectrum Analyzer Function

The spectrum analyzer performs FFT-based analysis over a frequency range of 200 kHz to 350 MHz. It is suitable for EMI checks and signal integrity analysis.

• Frequency Range: 200 kHz - 350 MHz
• FFT Length: Configurable from 400 kHz to 320 kHz.
• Features: Harmonic markers, cursor readings, and real-time 2D/3D waterfall display.

Figure 4: Spectrum Analyzer interface with 2D and 3D waterfall displays for detailed frequency analysis.

3.3 Frequency Response Analyzer Function

This function allows for Bode plot analysis, ideal for testing the stability of loops, optimizing analog filters, and measuring gain/phase/frequency characteristics.

• Frequency Range: 100 Hz - 50 MHz
• Amplitude: 0 to 5 Vpp
• Offset: +2.5 V to -2.5 V
• Frequency Count: 20 to 500
• Measurements: Gain, phase, and frequency.

Figure 5: Frequency Response Analyzer displaying a Bode plot for circuit analysis.

3.4 DDS Signal Generator Function

The built-in DDS signal generator can output various waveforms for testing and calibration purposes.

• Waveforms: 14 standard waveforms and support for 500 custom clipped waveforms.
• Frequency Range: 0 to 50 MHz
• Resolution: 1 Hz
• Amplitude: 0 to 5 Vpp
• Offset: -2.5 V to +2.5 V
• Duty Cycle: Adjustable from 0.1% to 99.9%.

4. Smart Features and Portability

The DPOS350P is designed for both laboratory and field use, incorporating several intelligent features:

• Waveform Storage: Stores up to 500 waveforms.
• Screenshots: Captures up to 90 screenshots.
• FFT Display: Integrated Fast Fourier Transform display.
• Bandwidth Limiter: Hardware bandwidth limiter at 150 M/20 M.
• Auto Power-Off: Configurable automatic shutdown to save battery.
• Battery: 8000 mAh rechargeable battery for extended portable use.
• Charging: USB-C charging port.
• Data Export: Supports USB data export and software updates.

5. Maintenance

5.1 General Care

Keep the device clean and dry. Avoid exposure to extreme temperatures, humidity, or direct sunlight. Use a soft, dry cloth for cleaning the exterior. Do not use abrasive cleaners or solvents.

5.2 Battery Care

To prolong battery life, avoid fully discharging the battery frequently. If storing the device for an extended period, ensure the battery is charged to approximately 50-70% and recharge it every few months.

5.3 Software Updates

Periodically check the manufacturer's website for available software updates to ensure optimal performance and access to new features. Updates can typically be performed via the USB data export port.

6. Troubleshooting

6.1 Device Does Not Power On

• Ensure the battery is sufficiently charged. Connect the device to a power source using the USB-C cable and allow it to charge for at least 30 minutes before attempting to power on again.
• Verify that the power button is pressed and held correctly.

6.2 Display Issues

• If the screen is unresponsive, try restarting the device.
• Adjust display brightness in the system settings.

6.3 Inaccurate Measurements

• Ensure probes are correctly connected and calibrated.
• Check measurement settings (e.g., voltage range, time base, resolution).
• Perform a self-calibration if available in the system menu.

For persistent issues, refer to the official FNIRSI support resources.

7. Specifications

8. Warranty and Support

The FNIRSI DPOS350P comes with a standard manufacturer's warranty. For detailed warranty terms, technical support, or service inquiries, please refer to the official FNIRSI website or contact your authorized dealer. Keep your purchase receipt as proof of purchase.