FNIRSI DSO-TC3 Digital Multimeter Instruction Manual

Notice to User

This manual introduces the use method, precautions and related matters of the product. When using this product, please read the manual carefully in order to obtain the best performance of the product.

• Do not use the instrument in a flammable and explosive environment.
• The used batteries cannot be disposed of with domestic waste. Please follow the national or local relevant laws and regulations to deal with it.
• If there is any quality problem with the instrument or you have questions about its use, you can contact FNIRSI online customer service or the manufacturer, we will promptly solve it for you.

1. Introduction

This product combines a digital oscilloscope, electronic component tester, signal generator, continuity test, voltage test, temperature and humidity measurement, infrared decoding and other functions. It is equipped with a large-size color TFT display, built-in rechargeable lithium battery, bringing users stronger and more practical functions with good portability.

2. Technical Specifications

2.1 Specifications and parameters of the device

2.2 Specifications and parameters of the DSO Digital Oscilloscope

• The oscilloscope has a real-time sampling rate of 10MSa/s and a bandwidth of 500KHz.
• With complete trigger function (single, normal, automatic), no matter if you're using periodic analog signals or non-periodic digital signals.
• Maximum measured voltage signal is 400V.
• Equipped with efficient AUTO, the measured waveform can be displayed without cumbersome adjustments.

2.3 Specifications and parameters of TC3 component test mode

• The instrument can automatically identify and measure various transistors, including NPN and PNP triodes, N-channel and P-channel mosfet, junction mosfet, diodes, dual diodes, thyristors, and resistors, inductors, capacitors and other passive components.
• Automatic detection of pin definition.
• Automatically analyze NEC protocol infrared code.
• Other functional modes: Including circuit continuity test, 0~40V input voltage measurement, PWM output, 0~32V regulated diode measurement, DS18B20 temperature sensor measurement, DHT11 temperature and humidity sensor measurement, etc.

NOTE:

• ①Ices, Iceo, Uf are only displayed when they are valid.
• ② Junction capacitance and reverse leakage current are only displayed when they are valid.
• ③The turn-on or turn-off voltage of the FET must be less than 5V.
• ④ Displayed only when there is a protection of diode.
• ⑤Vloss is only displayed when it is valid.
• ⑥Two-legged components and measure the inductance when the resistance is less than 2.1kΩ.

2.4 Specifications and parameters of the signal Generator

The signal generator has a total of 6 waveforms to choose from, with adjustable frequency and amplitude.

3. KEY INTERFACE ANALYSIS

3.1 Button

The device has the following buttons:

Hide button:

3.2 Test socket

The device features five different test sockets, divided into 1-2-3 area and K-A-A area.

The test socket is located at the bottom left of the screen. It is a 14-hole double-row socket with a locking device. Each socket is marked 1, 2, 3, K, A. Sockets with the same label are internally short-circuited and have the same function.

There is a small lever at the left end of the socket. When standing up, the socket is relaxed. Insert or remove the component under test. Turn the lever down to lock the socket and begin testing.

After inserting the tested component and locking it, press the OK ☰ (MENU) button to test. The tester will automatically identify the component's pin name and test point, displaying them on the screen.

• When testing 2-pin components, you can insert them into any two different labels in the 1-2-3 area holes, in any order.
• When testing 3-pin components, you can insert them into any three different labels in the 1-2-3 area holes, in any order.
• The K-A-A jack is a special area for withstand voltage testing. It contains DC high voltage (about 30V or more). K is positive and A is negative. Do not mix them. For a Zener diode, insert the anode into A and the cathode into K.

Notice:

• Discharge the capacitor before measuring its capacitance, otherwise it may burn out the instrument.
• It is not recommended to test online or live.

3.3 Signal interface

Three MCX coaxial sockets are evenly distributed on the top surface, and their outer rings are connected together for a common ground. They are used for different purposes:

• [IN (0~40V)]: Test voltage input port, the core wire is positive, the maximum measured voltage cannot exceed DC40V.
• [DDS]: Signal generator signal output port, output five waveform signals with adjustable pulse width.
• [DSO]: Oscilloscope test signal input port, the maximum input voltage cannot exceed 40Vpk.

Notice: When testing the connection, use the test line with MCX plug to connect with the instrument.

3.4 Charging interface

• The instrument is powered by a built-in large-capacity lithium battery. The bottom surface is equipped with a USB Type-C charging port connected to a 5V charger.
• The indicator light is always red when charging, and the indicator light is green when fully charged.

4. OPERATION AND DESCRIPTION

4.1 Switching on and off

The device has four options on the home page. Short press the left and right keys to switch functions:

• M-Tester
• Oscilloscope
• Generator
• Tools

4.2 Operation and function description of the transistor tester

Short press the left and right keys ◀ / ▶ (RUN / HOLD) to switch to the transistor detector. Short press the confirmation key ☰ (MENU) to enter the transistor measurement page. The following shows the situation when no components are measured.

For triode measurement, short press the OK ☰ (MENU) button to start measurement.

For regulated diode measurement (Note: The regulated diode uses the K-A-A socket, with positive and negative polarity), short press the OK ☰ (MENU) button to start measurement.

1-2-3 Zone Test Bench Instructions for Use

Select an appropriate position and jacks with different labels in this area. Connect transistors, resistors, capacitors, inductances, etc. After the pins of the components are inserted and locked, click the OK ☰ (MENU) button to start the test. Wait for a few seconds, and the result will be displayed on the screen.

• The internal bipolar transistors of protective diodes and MOSFETs can be detected and displayed on the screen.
• Measure the current amplification factor (hFE) and emitter junction forward voltage of bipolar transistors. Darlington transistors can be identified by high threshold voltage and high current amplification factor.
• When measuring triodes, their parameters will only be displayed when the measurement is valid.
• The equivalent capacitance C and reverse leakage current of diodes will only be displayed when the measurement is valid.
• The turn-on or turn-off voltage of MOSFETs must be less than 5V, otherwise the measured result will only show its equivalent parameters (diodes, capacitors, etc.).
• The turn-on voltage of thyristors must be less than 5V. Additionally, the holding current for conduction must be less than 6mA, otherwise it cannot be measured correctly.
• The vLoss displayed when measuring capacitance indicates loss and attenuation. A larger value means worse capacitance performance. For capacitors below 20pF, a common practice is to test with a 20pF capacitor.
• The measuring range of inductance is 10uH-1000mH. Inductance is measured only when the resistance is less than 2.1kΩ. Air-core coils and power inductors cannot directly measure inductance. It is recommended to connect a suitable color ring inductor in series for testing.
• The test socket's output current is 6MA, which requires a SCR driven by a larger current.
• LEDs are detected as diodes, and the forward voltage drop ratio is higher than the normal value. Dual LEDs are detected as dual diodes. The LEDs will flash while detecting.

K-A-A Test Socket Instructions

Insert the positive of the component, such as a regulated diode, into A and the cathode into K. Lock the socket and click the OK ☰ (MENU) button to start the test. The maximum measurement range of the regulated diode is 24V.

4.3 Operation and function description of the oscilloscope

On the home page, short press the left and right keys ◀ / ▶ (RUN / HOLD) to switch to the oscilloscope function. Short press the confirmation key ☰ (MENU) to enter the oscilloscope page.

The parameters in the bottom and upper left corners of the screen can be selected by short pressing the left and right keys ◀ / ▶ (RUN / HOLD), and switching one by one after the effect is selected. The up and down keys ▲ / ▼ (Up / Down) are used to switch or adjust. Short press the OK ☰ (MENU) AUTO key to automatically adjust the shape, and long press the left key ◀ (RUN) to switch between STOP and RUN.

• The trigger mode indicator icon is the trigger edge indicator icon.
• Auto means automatic trigger, Single means single trigger, Normal means normal trigger.
• The vertical sensitivity indicates the voltage represented by a large grid in the vertical direction.
• The 1X/10X mode indicator icon must be consistent with the 1X/10X switch setting on the probe handle. If the probe is 1X, the oscilloscope should also be set to 1X. 1X measures ± 40V voltage, and 10X measures ± 400V voltage.
• 100uS is the horizontal time base, indicating the length of time represented by a large grid in the horizontal direction.
• AC/DC is the indicator icon of the input coupling mode. AC means AC coupling, and DC means DC coupling.
• RUN/STOP is the indicator icon for running/pause. RUN means running, STOP means pause. Long press the left button to switch.

Real-time measurement parameters

Long press the right button to show/hide the 8 real-time measurement parameters displayed in the upper part of the screen:

Oscilloscope probe

• Insert the oscilloscope probe with an MCX plug into the [DSO] jack on the top surface. First, adjust the attenuation gear on the probe, and connect the ground clip of the probe to the "reference ground" of the tested circuit.
• Connect the probe tip or hook to the measured node of the circuit, and observe the voltage waveform of the measured point on the screen.

Notice:

• The attenuation factor of the probe should match the voltage of the measured signal, and voltage signals exceeding the maximum range cannot be measured.
• When measuring signals exceeding the safe voltage, do not touch the exposed metal parts of the instrument to avoid electric shock.

4.4 Operation and function description of the signal generator

On the home page, short press the left and right keys ◀ / ▶ (RUN / HOLD) to switch to the signal generator function. Short press the confirmation key ☰ (MENU) to enter the signal generator page.

There are 6 signal waveforms to choose from:

• Sine wave
• Square wave
• Pulse wave
• Sawtooth wave
• Triangle wave
• DC

Short press the up and down keys ▲ / ▼, and the right key ▶ (HOLD) to choose to change the frequency or amplitude. Then short press the right key ▶ (HOLD) to change the value. Short press the left key ◀ (RUN) to exit. (Frequency upper limit is 10000Hz, amplitude value capped at 3.3V)

4.5 Toolbox

On the home page, short press the left and right keys ◀ / ▶ (RUN / HOLD) to switch to the toolbox. Short press the confirmation key ☰ (MENU) to enter the toolbox page.

There are 6 functions to choose from:

• Continuity test
• Voltage test
• DS18B20 digital temperature test
• DHT11 temperature and humidity test
• Infrared decoding
• Automatic calibration

Short press the up and down keys ▲ / ▼, after switching to the corresponding function, it will automatically measure.

• Continuity test: Use any two corners of the jack 1, 2, and 3 of the test socket to conduct continuous resistance tests. If the circuit has low resistance, it will be judged as "connected" and a buzzer will sound.
• Voltage detection: Insert the MCX test line into the top jack [IN (0~40V)] to detect the voltage between the test lines.
• DS18B20: Follow the prompts on the screen to insert the temperature sensor into the test socket for measurement.
• DHT11: Follow the prompts on the screen to insert the temperature and humidity sensor into the test socket for measurement (Do not connect the third pin of the DHT).
• Infrared decoding: When the tester is under test, point the infrared remote control at the "IR" mark on the tester panel, press the button on the remote control, and the instrument will automatically start receiving infrared signals and performing decoding processing. After successful decoding, the user code and data code will be displayed, along with the corresponding infrared waveform. If decoding fails or cannot be decoded, the user code and data code will not be displayed. If you are on the tester interface, you cannot enter the infrared decoding interface. If you are on the infrared decoding interface, the last successful decoding information will still be displayed.
• Automatic calibration: Insert the three-pin short wire into the 1-2-3 jack of the test socket according to the prompts, and the calibration will start automatically. After disconnecting the short wires according to the prompts during the calibration process, wait until the progress bar reaches 100% to complete the calibration under the current mode of the instrument. No other operations are required.

Notice: The external circuit must be powered off, otherwise the instrument may be damaged.

5. MENU SETTING

Long press the OK ☰ (MENU) button to enter the system setting page.

The configurable items are:

• Boot LOGO
• System language
• System volume
• Backlight brightness
• Default mode
• About

Short press the up and down keys ▲ / ▼ to switch, and short press the left and right keys ◀ / ▶ (RUN / HOLD) to adjust parameters or switch states.

6. FIRMWARE UPGRADE

Open the upgrade software on the host computer, connect the computer and the device with a USB cable, then while pressing the ▼ (Down) key, press the power key ⏵ (Power) to enter the upgrade page. Finally, select the corresponding firmware upgrade on the host computer page to complete the firmware upgrade.

7. ANALYSIS OF COMMON PROBLEMS

• Q: How to judge whether the battery is fully charged?
  A: After the battery is fully charged, the charging indicator will change from red to green.
• Q: Why does the test waveform keep shaking from side to side and cannot be fixed?
  A: The trigger voltage needs to be adjusted, which is the yellow arrow on the right. In trigger mode, press the up and down keys to adjust the trigger voltage. After adjusting the yellow indicator arrow between the upper and lower of the waveform, the waveform can be triggered and fixed.
• Q: Why is there no waveform when measuring a battery or other DC voltage?
  A: The battery voltage signal is a stable DC signal without a curved waveform. Adjust the vertical sensitivity in the DC coupling mode; there will be an upward or downward offset straight line waveform. If it is AC coupling, no matter how you adjust it, there will be no waveform.
• Q: Why is the measured 220V mains waveform not a standard sine wave with distortion?
  A: The mains power grid is generally polluted and contains more high-order harmonic components. These harmonics are superimposed, so a distorted sine wave will appear on the sine wave, which is a normal phenomenon. General mains waveforms have distortion, which is unrelated to the oscilloscope itself.
• Q: Why are the parameters of diodes and capacitances obtained when measuring MOSFETs and IGBTs?
  A: Because the turn-on or turn-off voltage of the MOSFET or IGBT is greater than 5V (the maximum supply voltage of the chip), the MOSFET or IGBT cannot be turned on or off normally, so only its equivalent parameters can be measured.

8. PRECAUTIONS

• After receiving the device, please use it after it is fully charged.
• When measuring high voltage, do not touch any metal part of the oscilloscope to avoid the risk of electric shock.
• Try not to perform high voltage tests while charging.
• Do not place the machine in an unstable place or where it may be subject to strong vibrations.
• Do not place the machine in places with high humidity, dust, direct sunlight, outdoors, or near heat sources.
• The instrument is powered by a built-in 3.7V rechargeable lithium battery. Please use a power adapter when using it for a long time to prolong battery life.
• When not in use for a long time, the battery should be discharged to 3.7V before storage, and it needs to be charged and discharged every quarter.
• Please use the voltage within the range specified in the manual for charging.
• When using the oscilloscope mode, pay attention to the selection of the 1X/10X attenuation. The attenuation of the oscilloscope needs to be the same as the attenuation of the probe.
• When calibrating, it is necessary to unplug the BNC probe, or short the positive and negative poles of the probe.

9. CONTACT US

Any FNIRSI users with any questions who contact us will have our promise to get a satisfactory solution + an Extra 6-Month Warranty to thank you for your support!

By the way, we have created an interesting community. Welcome to contact FNIRSI staff to join our community.

Shenzhen FNIRSI Technology Co., LTD.

Add.: West of Building C, Weida Industrial Park, Dalang Street, Longhua District, Shenzhen, Guangdong

E-mail: fnirsiofficial@gmail.com (Business)
fnirsiofficialcs@gmail.com (Equipment service)

Tel: 0755-83242477 / +8613536884686

http://www.fnirsi.cn/