FNIRSI 2C23T Portable Digital Oscilloscope, Multimeter, and Signal Generator User Manual

User Warnings

Please read this manual carefully to ensure the best condition of the product. Do not use the instrument in flammable and explosive environments. Used batteries and instruments cannot be discarded with household waste; dispose of them according to relevant national or local laws and regulations. If there are quality issues with the device or if you have questions about its use, please contact the Warranty Department at 0750429647, and they will resolve it for you.

1. Product Introduction

The FNIRSI-2C23T is a 3-in-1 digital oscilloscope, a fully functional, extremely practical device designed for maintenance and development industries. This device is equipped with three main functions: oscilloscope, multimeter, and signal generator. The oscilloscope adopts an FPGA+MCU+ADC hardware architecture with a sampling rate of 50MS/s and an analog bandwidth of 10MHz. It features a high-voltage protection module and supports measuring peak voltages up to ±400V. It also supports saving and viewing waveform screen captures for analysis. The multimeter has a 4-digit, 10000-count true RMS value and supports AC/DC voltage and current measurement, as well as capacitance, resistance, diode, and continuity functions. It is suitable for professionals, factories, schools, hobbyists, or families.

2. Aspect Introduction

Device Overview

The FNIRSI-2C23T is an ideal multifunctional instrument. It includes a built-in DDS signal generator that can output 7 types of signals with a maximum output of 2MHz for all signals and a 1Hz step. The output frequency, amplitude, and duty cycle are adjustable. It features a 2.8-inch high-definition LCD screen with a resolution of 320*240 and a built-in 3000mAh rechargeable lithium battery, providing up to 6 hours of standby time. It offers users more practical and powerful functions in a compact size, while also being highly portable.

Front Panel Description

Diagram Description: The front panel features a 2.8-inch color display. Key controls include: Power button (⏻), MENU button, CH1 button, CH2 button, AUTO button, SAVE button, CURSOR button, TRIGGER button, and PRM button. The device also has input ports labeled CH1 and CH2, a signal generator output, and multimeter input terminals (10A, mA, COM, VΩ+).

Side View Description

Diagram Description: The side view shows a charging indicator, a USB Type-C charging port, a reset button, and a support stand.

3. Parameters

General Parameters

4. Button and Function Introduction

4.1 Oscilloscope - Button and Operation Introduction

*Base calibration process takes a long time. Please be patient and do not use the equipment during calibration. If the device is accidentally operated and calibration is interrupted, please recalibrate. (Base calibration requires probe removal)

1.2 Oscilloscope - Interface Operation Description

1. Pause Indication: Press the ▶️ / ⏸️ button to pause the waveform, then press the acquisition button again to resume.
2. Time Base: 50ns-10s. On the oscilloscope page, use the left and right direction keys to adjust the time base.
3. Current Operation Channel Indication: Short press the CH1 and CH2 buttons. The direction keys will then control the waveform movement for the selected channel.
4. Function Generator Interface Status Prompt: Displays 8 states: OFF, Sine wave, Square wave, Triangle wave, Full wave, Half-wave, Zgomot (Noise) wave, and DC.
5. Battery Indicator Light: Full battery ? and discharged ?. When the battery level is low, a pop-up window will indicate this, and the device will automatically shut down after the countdown finishes.
6. Trigger Level: Displays the trigger voltage status. Short press ?️ CURSOR to adjust the trigger cursor. The interface will appear, indicating trigger voltage adjustment. At this point, short press the up and down direction keys to adjust the trigger.
7. Channel 1 Setting: When CH2 is in use, short press CH1 to switch. When CH1 is in use, short press CH2 to bring up a window for setting the commutator, magnification (X1, X10), and coupling (AC, DC) for Channel 1, as shown in the figure. At this moment, use the direction keys to configure, moving down, left, and right.
8. Channel 2 Setting: When CH1 is in use, short press CH2 to switch. When CH2 is in use, short press CH1 to bring up a window for setting the commutator, magnification (X1, X10), and coupling (AC, DC) for Channel 2, as shown in the figure. At this moment, use the direction keys to configure, moving down, left, and right.
9. Trigger Setting: Used to set the trigger mode, trigger channel, and trigger type. Short press ⚙️ TRIGGER to display the settings, as shown in the figure. At this moment, use the direction keys to configure up, down, left, and right.
10. Waveform Movement (Channel 1): When operating, short press ➡️ MOVE to set the waveform movement. An interface will appear, represented by ➕, indicating waveform movement. Use the up and down direction keys to move the Channel 1 waveform.
11. Waveform Movement (Channel 2): When operating, short press CH2. Then press ➡️ MOVE to set the waveform movement. An interface will appear, represented by ➕, indicating waveform movement. Use the up and down direction keys to move the Channel 2 waveform.
12. Left and Right Cursors: Short press ➡️ MOVE. An interface will appear, represented by ➕, indicating waveform movement. Use the direction keys (left and right) to move the cursor.
13. Measurement Parameter Display: Short press ? PRM to display and set measurement parameters, as shown in the figure. A long press of PRM will hide all measurements and parameters from the interface.

1.3 Oscilloscope - Saving Screen Captures

Saving Screen Capture

Short press ? SAVE, and a "Saving..." prompt will appear, as shown in the figure. The waveform interface will store images in BMP format, named "img_number". These can be viewed and deleted on the device itself or transferred to a computer for viewing via TYPE-C.

Visualizing Screen Capture

Long press ? SAVE to enter the saved waveform screen capture viewing page. Press ▶️ / ⏸️ to enter the screen capture interface for the corresponding saved waveform. Use the sequence buttons ➡️ MOVE, ?️ CURSOR, ⚙️ TRIGGER, ? PRM to navigate. When selecting multiple waveforms, use the direction keys to select the waveform, and the ➕ button to select it.

Attention: If the storage space is full, old files must be deleted before saving new ones.

1.4 Oscilloscope - Parameters

2.1 Signal Generator - Button Descriptions

2.2 Signal Generator - Interface Description

Diagram Description: The Signal Generator interface displays ON/OFF status, waveform type selection (SINE, SQUARE, TRIANGLE, Half-wave, Full-wave), Frequency (FREQ), Duty Cycle (Duty), and Amplitude (AMP) controls. Numbered elements indicate specific functions or parameters.

1. Output Status Indication: When a waveform type is not selected, press ▶️ / ⏸️ to turn the waveform output ON/OFF.
2. Battery Indicator Light: Full battery ? and discharged ?. When the battery level is low, a pop-up window will indicate this, and the device will automatically shut down after the countdown finishes.
3. 7 Output Waveform Types: Sine wave, Square wave, Triangle wave, Full wave, Half-wave, Noise wave, and DC.
4. Waveform Diagram: Displays the selected waveform.

2.3 Signal Generator - Parameters

3.1 Digital Multimeter - Button Descriptions

3.2 Digital Multimeter - Interface Description

1. Scale Bar: Displays the interval scale.
2. HOLD: Data Hold. Short press ▶️ / ⏸️ to toggle.
3. REL: Relative Measurement. Only the capacitance value is valid. Short press ? SAVE to activate.
4. Measurement Display: Shows the measured values.
5. Specific Measurement Gear: Indicates the selected measurement gear.
6. Speed Gear: The four buttons are used to indicate the speed gear.

Diagram Description: The multimeter ports are labeled 10A MAX FUSED, 250V MAX, 1A MAX FUSED, 250V MAX, 600V CAT IV, 1000V CAT III. The input terminals are labeled 10A, mA, COM, and VΩ+.

3.3 Multimeter Probe Interface Introduction

High Current Measurement

Connect the red test probe to the 10A port and the black test probe to COM, automatically identifying AC and DC currents.

Attention: If the measured current exceeds 10A, it may burn out the device. Ensure safety.

Low Current Measurement

Connect the red test probe to the mA port and the black test probe to COM, automatically identifying AC and DC currents.

Attention: If the measured current exceeds 1A, it may burn out the device. Before measuring, please evaluate the current beforehand. If unsure, use a high current gear first.

Automatic Measurement (Voltage, Resistance, Capacitance, Temperature, Diode/Continuity Test)

Connect the red test probe to the appropriate port and the black test probe to COM. Switch the equipment to the corresponding function based on the required measurement parameters.

Diagram Description: Shows the multimeter ports and connections.

Automatic Steps: Automatically identifies voltage and resistance levels. When measuring voltage, it automatically identifies AC/DC voltage.

Continuity/Diode Test: When measuring continuity, if the resistance is less than 50 Ω, a buzzer will sound. The screen will display the forward voltage for diode measurement. If the test lead polarity is reversed or the diode is damaged, the screen will display "OL".

LIVE (Live Wire Detection): Connect the red test probe to the ⚡ (LIVE) port. Short press ⚙️ TRIGGER to switch to LIVE mode. Use the red test probe to detect a live wire when encountered. The screen display is shown in the figure.

3.4 Parameters

5. Settings

Diagram Description: The settings screen shows options for Volume, Auto Shutdown, Screen Brightness, Startup on Boot, About, and Factory Default.

1. Select Item: Language, Volume, Screen Brightness, Startup, About, Factory Settings.
2. Specific Settings:
   • Language: English, Russian, Portuguese, German, Japanese.
   • Volume: Button prompt tone.
   • Auto Shutdown: Off, 15 minutes, 30 minutes, 1 hour.
   • Screen Brightness: 1-100%.
   • Startup: Turns off the oscilloscope, signal generator, and multimeter. This is used to set which functional block starts automatically on power-up.

6. Update

1. Obtain the latest firmware from the official website and extract it to your desktop.
2. Connect the device to the computer using the USB-A to Type-C data cable. Press and hold the MENU button, then press to enter firmware update mode. The computer will open the USB flash drive.
3. Copy the firmware to the USB drive. After successful copying, the device will automatically update the firmware.
4. Observe the upgrade progress. After the upgrade is complete, the device will restart.

7. Personalize Logo

Prepare the startup interface image to be replaced and import it into Photoshop software.

Specific Export Operations

1. First, prepare an image for the startup interface. The image size must be 320x240 pixels, the format must be [.bmp], and the filename must be [logo2c23.bmp].
2. Select [Menu] > [Store As] or [Store Copy].
3. Enter Advanced Mode. Select [16 bits] and [R5 G6 B5] and verify the row order sequence. Click [OK].
4. Diagram Description: Shows BMP Options and BMP Advanced Modes dialogs for image settings.
5. Connect the device to the computer using the USB-A to Type-C data cable.
6. Drag the prepared logo image to the device's USB drive. After the operation is complete, the personalized logo will be updated the next time the computer starts.
7. Note: Before changing the logo, please carefully check the file name, image pixel dimensions, format, etc.

8. Common Test Methods

8.1 Battery or Voltage Measurement

Select Gear:

Battery voltage is generally below 80V, while other DC voltages are uncertain. It is necessary to adjust the gear according to the current situation. If it is below 80V, use 1X gear. If it is above 80V, use 10X gear (position of the gear). The probe and oscilloscope should be set to the same gear.

1. First, set the oscilloscope to automatic trigger mode (default after power-on), which is used for testing periodic signals (DC voltage belongs to periodic signals).
2. Set the oscilloscope to the corresponding gear (default 1X after power-on).
3. Set the oscilloscope to DC coupling mode.
4. Insert the probe and move the switch on the probe handle to the corresponding gear position.
5. Ensure the battery has sufficient power or DC output voltage.
6. Connect the probe clip to the negative pole of the battery or the negative pole of the DC, and connect the probe to the battery or the negative pole of the DC.
7. Press the [AUTO] button once, and the DC signal will be displayed. Note that battery voltage or other DC voltages are DC signals, which will appear as a curve or waveform with an offset up and down, or just a straight line. The peak-to-peak voltage (VPP) and frequency (F) of this signal are both 0.

8.2 Crystal Oscillator Measurement

Select Gear:

When the crystal oscillator encounters capacitance, it is easy to stop oscillation. The input capacitance of the 1X probe is as high as 100-300pF, while the 10X gear is approximately 10-30pF. It is easy to stop oscillation in 1X gear, so the 10X gear must be selected, meaning both the probe and the oscilloscope should be switched to the 10X gear.

1. First, set the oscilloscope to automatic trigger mode (default after power-on), which is used for testing periodic signals (crystal oscillator sinusoidal signals belong to periodic signals).
2. Set the oscilloscope to 10X gear (default 1X after power-on).
3. Set the oscilloscope to AC coupling mode.
4. Insert the probe and move the switch on the probe handle to the 10X position.
5. Ensure the crystal oscillator's base board is powered on and functioning.
6. Connect the probe clip to the ground wire of the crystal oscillator's base board (negative pole of the power supply), pull off the probe cap, insert the probe tip into contact with one of the oscillator pins.
7. Press the [AUTO] button once, and the waveform of the tested crystal oscillator will be displayed. If the waveform after AUTO adjustment is too small or too large, you can manually adjust the waveform size in zoom mode.

8.3 MOS Transistor or IGBT PWM Signal Measurement

Select Gear:

The PWM signal voltage for direct driving of MOS or IGBT transistors is generally between 10V~20V, and the front control PWM signal is also generally between 3-20V. The maximum test voltage for 1X gear is 80V, so using 1X gear for testing PWM signals is sufficient (both probe and oscilloscope are set to 1X gear).

1. First, set the oscilloscope to automatic trigger mode (default after power-on), which is used for testing periodic signals (PWM belongs to periodic signals).
2. Set the oscilloscope to 1X gear.
3. Set the oscilloscope to DC coupling mode.
4. Insert the probe and move the switch on the probe handle to the 1X position.
5. Ensure the PWM base board has a PWM output signal at this moment.
6. Connect the probe clip to the MOS transistor's S pole and the probe to the G pole. Press the [AUTO] button once, and the measured PWM waveform will be displayed. If the waveform after AUTO adjustment is too small or too large, you can manually adjust the waveform size in zoom mode.

8.4 Signal Generator Output Measurement

Select Gear:

The output voltage of the signal generator is 30V, and the maximum test voltage for 1X gear is 80V. Therefore, using 1X gear for testing the signal generator output is sufficient (both probe and oscilloscope are set to 1X gear).

1. First, set the oscilloscope to automatic trigger mode (default after power-on), which is used for testing periodic signals.
2. Set the oscilloscope to 1X gear.
3. Set the oscilloscope to DC coupling mode.
4. Insert the probe and move the switch on the probe handle to the 1X position.
5. Ensure the signal generator is powered on and emitting signals.
6. Connect the probe clip to the negative line of the signal generator and connect the red probe to the red line of the signal generator's output.
7. Press the [AUTO] button once, and the output waveform will be displayed. If the waveform after AUTO adjustment is too small or too large, you can manually adjust the waveform size in zoom mode.

8.5 AC 220V or 110V Power Supply Measurement

Select Gear:

Household electricity is generally 180-260V, with a peak-to-peak voltage of 507-733V. In some countries, household electricity is 110V, with a peak-to-peak voltage of 310V. The maximum measurement for 1X gear is 80V, and the maximum measurement for 10X gear is 800V (10X gear can withstand up to 1600V peak-to-peak). Therefore, it is necessary to set it to 10X gear, meaning both the probe and the oscilloscope should be switched to 10X speed gear.

1. First, set the oscilloscope to automatic trigger mode (default after power-on), which is used for testing periodic signals (50 Hz for household appliances is considered a periodic signal).
2. Set the oscilloscope to 10X.
3. Set the oscilloscope to DC coupling mode.
4. Insert the probe and move the switch on the probe handle to the 10X position.
5. Ensure there is household electrical output at the tested end.
6. Connect the probe clip and probe to the two wires of the household appliance, without distinguishing between positive and negative poles.
7. Press the [AUTO] button once, and the waveform of the household appliance's electrical energy will be displayed. If the waveform after AUTO adjustment is too small or too large, you can manually adjust the waveform size in zoom mode.

8.6 Ripple Voltage Measurement

Select Gear:

If the output voltage of the power supply is below 80V, set the gear to 1X (both probe and oscilloscope set to 1X). If it is between 80-800V, set it to 10X gear (both probe and oscilloscope set to the same speed).

1. First, set the oscilloscope to automatic trigger mode (default after power-on), which is used for testing cycle signals.
2. Set the oscilloscope to the corresponding gear (default 1X after power-on).
3. Set the oscilloscope to AC coupling mode.
4. Insert the probe and move the switch on the probe handle to the corresponding speed position.
5. Ensure the power supply is turned on and there is an output voltage.
6. Connect the probe clip to the negative terminal of the power output, and connect the red probe to the positive terminal of the power output. Wait approximately 10 seconds until the yellow line and the green line from the left end of the waiting period appear.
7. Press the [AUTO] button once, and the ripple will be displayed.

8.7 Inverter Output Measurement

Select Gear:

The output voltage of the inverter is similar to household electricity, usually a few hundred volts. Therefore, it should be set to 10X gear (both probe and oscilloscope are set to 10X speed gear).

1. First, set the oscilloscope to automatic trigger mode (default after power-on), which is used for testing periodic signals (inverter transmitted signals belong to periodic signals).
2. Set the oscilloscope to 10X.
3. Set the oscilloscope to DC coupling mode.
4. Insert the probe and move the switch on the probe handle to the 10X position.
5. Ensure the inverter is powered on and has an output voltage.
6. Connect the probe clip and probe to the inverter's output end without distinguishing between positive and negative poles.
7. Press the [AUTO] button once, and the output waveform from the inverter will be displayed. If the waveform after AUTO adjustment is too small or too large, the waveform size can be manually adjusted in zoom mode.

8.8 Power Amplifier or Audio Signal Measurement

Select Gear:

The output voltage of the power amplifier is generally below 40V, and the maximum test voltage for 1X gear is 80V, so it is sufficient to use 1X (both probe and oscilloscope are set to 1X).

1. First, set the oscilloscope to automatic trigger mode (default after power-on).
2. Set the oscilloscope to 1X.
3. Set the oscilloscope to AC coupling mode.
4. Insert the probe and move the switch on the probe handle to the 1X position.
5. Ensure the amplifier is powered on and emitting audio signals.
6. Connect the probe clip and probe to the two output terminals of the power amplifier, without distinguishing between positive and negative poles.
7. Press the [AUTO] button once, and the output waveform from the power amplifier will be displayed. If the waveform after AUTO adjustment is too small or too large, you can manually adjust the waveform size in zoom mode.

8.9 Automotive Communication/Bus Signal Measurement

Select Gear:

Communication signals used in automobiles are generally less than 20V, and the maximum test voltage for 1X gear is 80V. Therefore, using 1X gear for testing communication signals is sufficient (both probe and oscilloscope are set to 1X).

1. First, set the oscilloscope to Normal trigger mode (default is automatic trigger mode after power-on). Normal trigger mode is used specifically for measuring non-periodic digital signals.
2. Set the oscilloscope to 1X position.
3. Set the oscilloscope to AC coupling mode.
4. Insert the probe and move the switch on the probe handle to the 1X position.
5. Connect the probe clip and probe to the two signal wires of the communication line, regardless of positive or negative. If there are multiple signal wires, determine the signal wires in advance or try selecting two of them multiple times for testing.
6. Ensure there is a communication signal on the communication line at this moment.
7. Adjust the vertical sensitivity to 50mV gear.
8. Set the time base to 20uS.
9. When there is a communication signal on the communication line, the oscilloscope will capture and display it on the screen. If it cannot be captured, it is necessary to try adjusting the time base (1mS~6nS) and trigger the voltage (red arrow) multiple times for debugging.

8.10 Infrared Remote Control Receiver Measurement

Select Gear:

Infrared remote control signals vary, generally from 3 to 5V, with a maximum test voltage of 80V in the X gear. Therefore, using 1X gear for testing communication signals is sufficient (both probe and oscilloscope are set to 1X speed).

1. First, set the oscilloscope to Normal trigger mode (default is automatic trigger mode after power-on). Normal trigger mode is used specifically for measuring non-periodic digital signals.
2. If Auto mode is used, it may not capture non-periodic signals, as infrared remote control signals belong to digital coding signals.
3. Set the oscilloscope to 1X position.
4. Set the oscilloscope to DC coupling mode.
5. Insert the probe and move the switch on the probe handle to the 1X position.
6. Connect the probe clip to the ground terminal (negative pole) of the infrared receiver's base board and connect the probe to the data pin of the infrared receiver's head.
7. Set the vertical sensitivity to 1V.
8. Set the time base to 20uS.
9. Adjust the position of the yellow arrow above the position of the yellow arrow to the left.
10. At this moment, use the remote control to send a signal to the infrared receiver, and a waveform will appear on the oscilloscope.

8.11 Sensor Circuit Measurement (Temperature, Humidity, Pressure, Hall Effect, etc.)

Select Gear:

Sensor signals are generally relatively weak, approximately a few millivolts. This small signal cannot be directly detected by an oscilloscope. This type has a signal amplifier on the base board, which can measure the amplified signal. 1X gear can be used (both probe and oscilloscope are set to 1X gear).

1. First, set the oscilloscope to automatic trigger mode (default is automatic trigger mode after power-on).
2. Set the oscilloscope to 1X position.
3. Set the oscilloscope to DC coupling mode.
4. Insert the probe and move the switch on the probe handle to the 1X position.
5. Connect the probe clip to the ground terminal (negative pole) of the sensor's base board, locate the output terminal of the amplification section, and connect the probe to this output terminal.
6. Adjust the vertical sensitivity to 50mV gear.
7. Switch to keyboard movement mode and move the yellow arrow at the bottom of the waveform horizontally.
8. Set the time base to 500mS and enter slow scan mode.
9. If the yellow signal line appears at the top of the part, it is necessary to reduce the vertical sensitivity, which is 100mV, 200mV, 500mV, etc. When the updated signal on the right is not at the top (usually in the middle), the signal received by this sensor can be detected at this moment.

9. Warnings

• When using dual channels simultaneously, the ground clips of both probes must be connected together. It is strictly forbidden to connect the ground clips of the two probes to different potentials, especially to the different potential terminals or 220V of high-power equipment. Otherwise, the oscilloscope's base board will be burned because the two channels are grounded together, and connecting to different potentials will cause a short circuit in the internal wires, as is the case with all oscilloscopes.
• The maximum input tolerance for the oscilloscope's BNC is 400V, and it is strictly forbidden to input a voltage exceeding 400V under the 1X probe switch.
• When charging, a separate charging body must be used. It is prohibited to use the power supply or USB of other devices for testing, otherwise, it may cause a short circuit on the base board and burn the base board during the test process.
• Before using the product, please check if the insulation near the casing and interface is damaged.
• Please keep your finger behind the device for protection when handling the probes.
• When measuring the tested circuit, do not touch all the ports of entry.
• Please disconnect the test probe and circuit connection before changing the gear position.
• When the DC test voltage is greater than 36V, and the AC test voltage is greater than 25V, users should take precautions to avoid electric shock.
• When the battery level is too low, a pop-up message will appear. Please charge it in time to avoid affecting the performance of the measurement.

DEEE Information:

Buyers have the obligation not to dispose of Waste Electrical and Electronic Equipment (WEEE) as unsorted municipal waste and to collect them separately. Separate collection of WEEE can ensure a reduced incidence of hazardous substances on the environment and human health, as well as resource conservation.

Each EEE is composed of a combination of components containing different substances, some hazardous, which, on the one hand, can be secondary raw materials that can be reused, and on the other hand, can be an important source of environmental pollution and can have a negative impact on human health if not collected separately and recycled properly. The symbol indicating that electrical and electronic equipment is subject to separate collection is a wheeled bin crossed out with a cross. This pictogram indicates that WEEE must not be mixed with household waste and that they are subject to separate collection.

Diagram Description: Shows the WEEE symbol (crossed-out wheeled bin).

Importer Information

Importer: SC Bitmi Technologies SRL

Address: Str. Ion Dragoslav Nr.24C, Fălticeni, Suceava

Website: www.bitmi.ro

Telephone: 0757771838

Manufactured in PRC