Fnirsi DPOS350P English Manual

1. Product Introduction

The FNIRSI DPOS350P is an advanced 4-in-1 multi-function tablet oscilloscope that combines four essential testing instruments in one portable device:

Key Features

• Digital Oscilloscope: 100 MHz bandwidth, 1 GSa/s, dual-channel
• Signal Generator: 0.1 Hz – 20 MHz, multiple waveforms
• Digital Multimeter: True RMS, voltage/current/resistance
• Logic Analyzer: 8 channels with protocol decoding
• Display: 7-inch touchscreen (1024×600)
• Battery: Built-in rechargeable lithium battery
• Storage: Save waveforms and screenshots
• Protocols: I2C, SPI, UART, CAN, LIN, 1-Wire decoding

Applications

• Electronics design and debugging
• Circuit testing and analysis
• Education and training
• Field service and repair
• Embedded system development
• Automotive diagnostics

2. Special Precautions

Electrical Safety

• ⚠ Maximum input voltage: 400V DC or 400V AC (peak)
• ⚠ Do not exceed rated input ranges
• ⚠ Use only specified probes and accessories
• ⚠ Ensure proper grounding when testing AC circuits
• ⚠ Do not measure high-voltage circuits without proper protection
• ⚠ Discharge capacitors before testing

Operating Precautions

• Operating temperature: 0°C to 40°C
• Storage temperature: -20°C to 60°C
• Humidity: ≤80% RH (non-condensing)
• Do not operate in wet or humid environments
• Keep away from strong magnetic fields
• Avoid dropping or impact damage
• Do not disassemble the unit

Maintenance

• Clean with soft, dry cloth only
• Do not use chemical solvents
• Calibrate regularly for accuracy
• Store in cool, dry place
• Charge battery at least once every 3 months during storage

3. Product Parameters

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Oscilloscope Specifications

Bandwidth	100 MHz
Channels	2 (CH1, CH2)
Sample Rate	1 GSa/s (single channel), 500 MSa/s (dual channel)
Memory Depth	50K points per channel
Vertical Sensitivity	5 mV/div – 10 V/div (1-2-5 steps)
Input Impedance	1 MΩ ± 2% // 15 pF ± 5 pF
Input Coupling	DC, AC, GND
Maximum Input Voltage	400V (DC + AC peak)
Vertical Resolution	8 bits
Timebase Range	5 ns/div – 500 s/div
Trigger Modes	Auto, Normal, Single
Trigger Types	Edge, Pulse, Video, Slope

Signal Generator Specifications

Frequency Range	0.1 Hz – 20 MHz
Waveforms	Sine, Square, Triangle, Sawtooth
Amplitude Range	0 – 3.3V (peak-to-peak)
Output Impedance	50 Ω
Frequency Accuracy	±0.01%
Duty Cycle (Square)	10% – 90%

Multimeter Specifications

Function	Range	Accuracy
DC Voltage	0 – 600V	±(0.5% + 5 digits)
AC Voltage (True RMS)	0 – 600V	±(1.0% + 10 digits)
DC Current	0 – 10A	±(1.0% + 5 digits)
AC Current (True RMS)	0 – 10A	±(1.5% + 10 digits)
Resistance	0 – 60 MΩ	±(1.0% + 5 digits)
Capacitance	0 – 10 mF	±(3.0% + 10 digits)
Frequency	10 Hz – 10 MHz	±(0.1% + 3 digits)
Duty Cycle	1% – 99%	±(1% + 2 digits)
Diode Test	0 – 3V	±(2% + 5 digits)
Continuity Test	< 50 Ω	Buzzer alert
Temperature (K-type)	-20°C – 400°C	±(1.0% + 3°C)

Logic Analyzer Specifications

Channels	8 digital channels (D0-D7)
Sample Rate	100 MSa/s
Memory Depth	10K samples per channel
Input Voltage Range	-10V to +10V
Logic Threshold	TTL, CMOS (adjustable)
Protocol Decoding	I2C, SPI, UART, CAN, LIN, 1-Wire

General Specifications

Display	7-inch TFT LCD, 1024×600 resolution
Touchscreen	Capacitive multi-touch
Battery	4000 mAh lithium-ion
Battery Life	4-6 hours (typical use)
Charging Time	3-4 hours (5V/2A adapter)
USB Interface	Type-C (charging + data transfer)
Storage	8 GB internal memory
File Formats	BMP (screenshots), CSV (data export)
Operating Temperature	0°C to 40°C
Storage Temperature	-20°C to 60°C
Dimensions	200 mm × 130 mm × 30 mm
Weight	Approx. 450g

4. Function Description

Front Panel Components

1. 7-inch touchscreen display
2. Power button (press 3 seconds to power on/off)
3. BNC connectors for CH1 and CH2 (oscilloscope inputs)
4. Signal generator output (BNC connector)
5. Logic analyzer input connector (8-pin)
6. Multimeter input jacks (COM, V/Ω, mA, 10A)
7. Type-C USB port (charging and data)
8. Reset button (firmware recovery)

Touchscreen Interface

• Mode Selection Icons: Switch between OSC/DMM/SIG/LA modes
• Settings Menu: Access system settings and calibration
• File Manager: Browse and manage saved files
• Screenshot Button: Capture current screen (BMP format)
• Help Button: Quick reference guide

Oscilloscope Mode

• Vertical Controls: Adjust voltage scale (V/div)
• Horizontal Controls: Adjust time scale (s/div)
• Trigger Settings: Configure trigger type and level
• Run/Stop Button: Start/pause waveform acquisition
• Auto Setup: Automatic configuration for input signal
• Measurement Menu: Select automatic measurements
• Cursor Mode: Manual measurements with cursors
• Math Functions: Add, subtract, multiply, divide, FFT

Signal Generator Mode

• Waveform Selection: Sine, square, triangle, sawtooth
• Frequency Adjustment: 0.1 Hz – 20 MHz
• Amplitude Control: 0 – 3.3V peak-to-peak
• Duty Cycle (Square): 10% – 90% adjustable
• Output Enable/Disable: Toggle signal output on/off

Multimeter Mode

• Function Selection: DC/AC voltage, current, resistance
• Range Selection: Auto or manual range selection
• Hold Function: Freeze current reading
• Relative Mode: Zero/offset adjustment
• Min/Max/Avg Recording: Track measurement statistics

Logic Analyzer Mode

• Channel Enable: Select active channels (D0-D7)
• Threshold Settings: Set logic level threshold
• Trigger Configuration: Pattern trigger setup
• Protocol Decoder: Select I2C/SPI/UART/CAN/LIN/1-Wire
• Data Export: Save decoded data to CSV file

5. Operation Guide

Basic Setup

Step 1: Initial Power-On

• Charge the device fully before first use (3-4 hours)
• Press and hold power button for 3 seconds
• System will boot and display main menu (10-15 seconds)
• Select your preferred mode from the home screen

Step 2: Oscilloscope Basic Operation

1. Connect oscilloscope probe to CH1 or CH2 BNC connector
2. Connect probe to circuit under test
3. Touch ‘OSC’ icon to enter oscilloscope mode
4. Press ‘Auto’ button for automatic setup
5. Adjust V/div and s/div for optimal viewing
6. Configure trigger settings if needed
7. Press ‘Run’ to start continuous acquisition

Step 3: Signal Generator Operation

1. Connect BNC cable from SIG output to your circuit
2. Touch ‘SIG’ icon to enter signal generator mode
3. Select waveform type (sine/square/triangle/sawtooth)
4. Set frequency using on-screen controls or keypad
5. Adjust amplitude (0-3.3V peak-to-peak)
6. For square wave: adjust duty cycle (10%-90%)
7. Touch ‘Output ON’ to enable signal generation

Step 4: Multimeter Operation

1. Connect test leads to appropriate jacks:
   • Red lead to V/Ω jack (voltage/resistance)
   • Black lead to COM jack (common)
   • For current: red lead to mA or 10A jack
2. Touch ‘DMM’ icon to enter multimeter mode
3. Select measurement function (V, A, Ω, etc.)
4. Select AC or DC as appropriate
5. Choose auto or manual range
6. Connect probes to circuit
7. Read measurement on display

Step 5: Logic Analyzer Operation

1. Connect logic analyzer probe cable to 8-pin connector
2. Connect probe clips to digital signals (D0-D7)
3. Touch ‘LA’ icon to enter logic analyzer mode
4. Enable channels you want to monitor
5. Set logic threshold (TTL/CMOS)
6. Configure trigger conditions
7. Select protocol decoder if analyzing I2C/SPI/UART/etc.
8. Press ‘Run’ to start capture

Advanced Operations

Protocol Decoding Setup

• I2C Decoding: Assign SDA and SCL signals to channels. Decoded data shows: Address, R/W, Data, ACK/NACK
• SPI Decoding: Assign MOSI, MISO, CLK, CS signals. Configure clock polarity and phase
• UART Decoding: Assign TX and RX signals. Set baud rate, data bits, parity, stop bits

FFT Analysis (Oscilloscope)

1. Capture time-domain waveform
2. Touch ‘Math’ menu
3. Select ‘FFT’ function
4. Frequency spectrum appears on display
5. Adjust FFT window type (Hanning, Hamming, Blackman)

Saving and Exporting Data

• Screenshots: Touch camera icon (saves as BMP)
• Waveform Data: Menu → Save → CSV format
• File Access: Connect USB cable and transfer to PC

6. Common Issues and Diagnostics

Issue	Possible Cause	Solution
Device won’t power on	Battery depleted	Charge for 30 min
	System frozen	Press reset button
No waveform display	Wrong V/div scale	Press ‘Auto’ button
	No trigger	Adjust trigger level
	Probe damaged	Test probe continuity
Signal generator no output	Output disabled	Enable output button
	Amplitude = 0V	Increase amplitude
	Cable issue	Check BNC connection
Multimeter reading ‘OL’	Range too low	Switch to higher range
	Open circuit	Check connections
Logic analyzer no data	Threshold wrong	Adjust threshold level
	Probe not connected	Check all connections
	Sample rate low	Increase sample rate
Touchscreen unresponsive	Screen protector	Remove if too thick
	Needs calibration	Settings → Calibrate
Battery drains quickly	Brightness high	Reduce screen brightness
	Old battery	Contact support
Inaccurate measurements	Needs calibration	Perform calibration
	Temperature drift	Allow warm-up time

Calibration Procedure

1. Let device warm up for 30 minutes
2. Go to Settings → Calibration
3. Follow on-screen instructions
4. Use provided calibration signals
5. Complete all calibration steps

Firmware Update

1. Download latest firmware from www.fnirsi.com
2. Copy .bin file to device via USB
3. Settings → System → Firmware Update
4. Select firmware file and confirm
5. Wait for update to complete (5-10 minutes)
6. Device will restart automatically

7. Contact Us

Manufacturer

Company	Shenzhen Zhuo Yue Xin Technology Co., Ltd.
Brand	FNIRSI
Product	DPOS350P 4-in-1 Tablet Oscilloscope
Model	DPOS350P
Version	V1.6

Support

Website	www.fnirsi.com
Email	support@fnirsi.com
Downloads	Manuals, firmware, software at www.fnirsi.com/support
Video Guides	Available on YouTube and website

8. Warranty Instructions

Warranty Coverage

• Period: 12 months from date of purchase
• Covers: Manufacturing defects, component failures
• Includes: Free repair or replacement (at manufacturer’s discretion)

Warranty Exclusions

• ✗ Damage from misuse, abuse, or accidents
• ✗ Unauthorized modifications or repairs
• ✗ Normal wear and tear (battery, screen protector)
• ✗ Damage from improper storage or transportation
• ✗ Cosmetic damage that doesn’t affect functionality

Warranty Claim Procedure

1. Contact support@fnirsi.com with:
   • Proof of purchase (receipt or invoice)
   • Serial number (on back label)
   • Description of issue with photos/videos
2. Await response with instructions (1-2 business days)
3. Ship device to service center if required
4. Repair/replacement completed within 15 business days
5. Device returned via courier

Important Notes

• Keep proof of purchase for warranty service
• Register product at www.fnirsi.com for extended support
• Warranty valid worldwide
• Customer responsible for shipping costs to service center
• Return shipping covered by FNIRSI

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