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FNIRSI DSO-TC3 Digital Multimeter Instruction Manual
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FNIRSI DSO-TC3 Digital Multimeter Instruction Manual

NOTICE TO USERThis manual introduces the use method, precautions and related matters of the product. When using thisproduct, 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 it’s use, you can contact FNIRSI
online customer service or the manufacturer, we will promptly solve it for you.

Contents [ hide
1 1. INTRODUCTION
2 2. TECHNICAL SPECIFICATIONS
2.1 2.1 Speciﬁcations and parameters of the device
2.2 2.2 Speciﬁcations and parameters of the DSO Digital
Oscilloscope
2.3 2.3 Speciﬁcations and parameters of TC3 component test mode
2.4 2.4 Speciﬁcations and parameters of the signal Generator
3 3. KEY INTERFACE ANALYSIS
3.1 3.1 Button
3.2 3.2 Test socket
3.3 3.3 Signal interface
3.4 3.4 Charging interface
4 4.OPERATION and DESCRIPTION
4.1 4.1 Switching on and oﬀ
4.2 4.2 Operation and function description of the transistor tester
4.3 4.3 Operation and function description of the oscilloscope
4.4 4.4 Operation and function description of the signal generator
4.5 4.5 Toolbox
5 5. MENU SETTING
6 6.FIRMWARE UPGRADE
7 7.ANALYSIS OF COMMON PROBLEMS
8 8. PRECAUTIONS
9 9.Contact US
10 Documents / Resources10.1 References
11 Related Posts

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 are skilfully
integrated. It is equipped with a large-size color TFT display, built-in rechargeable lithium battery, brings 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, Nchannel 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 temperatureand humidity sensor measurement, etc.

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

3.2 Test socket

A total of ﬁve diﬀerent test sockets are divided into 1-2-3 area and K-A-A area for the convenience ofdescription(as pictured above).
The test socket is at the bottom left of the screen, it is a 14-hole double-row socket with a locking device, andeach socket is marked 1, 2, 3, K, A, those with the same label are short-circuited internally, and have the samefunction.
There is a small lever at the left end of the socket. When standing up, the socket is relaxed. At this time, insert
or take out the component under test, turn the socket is locked and tested when lowered.

After inserting the tested component and locking it, press to test, and the tester will automatically identify thepin name of the component and the test point where it is located are displayed on the screen.
When testing 2-pin components, you can insert any two diﬀerent labels in the 1-2-3 area holes, in any order.
When testing 3-pin components, you can insert 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, which contains a DC high voltage of about 30Vor more, K is positive and A is negative, and is used for withstand voltage pressure test, do not mix. Insert theanode of the component under test, such as a Zener diode, into A and the cathode into K.
⚠ Notice
Discharge the capacitor before measuring the 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, and they are used for diﬀerent purposes: IN (0~40V)-Test voltage input port, the core wireis 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, and the bottom surface is equipped witha 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

4.2 Operation and function description of the transistor tester

1-2-3 Zone Test Bench Instructions for Use
Select an appropriate position in this area and jacks with diﬀerent labels, and connect transistors, resistors,capacitors, inductances, etc. After the pins of the components are inserted and locked, click to start the test, wait
for a few seconds, the result will be displayed on the screen.
The inside bipolar transistors of the Protective diodes and MOSFETs can be detected and displayed on thescreen.
Measure the current ampliﬁcation factor (hFE) of the bipolar transistor and the conducting voltage of the emitter
junction. Darlington transistors can be identiﬁed by the high threshold voltage and high current ampliﬁcation
factor.
Measuring triode, its parameters will only be displayed when the measurement is valid.
The equivalent capacitance C and reverse leakage current of the diode will only be displayed when themeasurement is valid.
The turn-on or turn-oﬀ voltage of the mosfet must be less than 5V, otherwise the measured result is only its
equivalent parameters (diodes, capacitors, etc.).
The turn-on voltage of the thyristor must be less than 5V, in addition, the trigger current for maintaining
conduction must be less than 6mA,Otherwise it cannot be measured correctly.
The vLoss displayed when measuring capacitance means loss and attenuation. The larger the value, theworse the capacitance performance.For capacitors below 20pF, the rule of thumb is to test with a 20pFcapacitor.
The measuring range of inductance is 10uH-1000mH. The inductance is only measured when the resistance isless than 2.1k. Air-core coils and power inductors cannot directly measure the inductance. It is recommended
to try to connect a suitable color ring electrode in series to test.
The output current of the test socket is 6MA, which requires a SCR driven by a larger current.
The LED is detected as a diode, and the forward voltage drop ratio is higher than the normal value. Dual LEDs
are detected as dual diode. The leds will ﬂash while detecting.
K-A-A Test Socket Instructions
Insert of the component positive, such as the regulated diode, into A and the cathode into K, lock the socket andclick to start the test. The max 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 to switch to the oscilloscope function, and short press theconﬁrmation key to enter the oscilloscope pages shown.
The parameters in the bottom and upper left corners of the screen can be selected by short pressing the left andright keys, and switching one by one after the eﬀect is selected, and the up and down keys / , to switch or adjust;short press the AUTO key to automatically adjust the shape, and long press the left key to switch between STOPand 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, indicating the voltage represented by a large grid in the vertical direction.
1X/10X mode indicator icon must be kept consistent with the1X/10X switch setting on the probe handle, if the probe is 1X, then the oscilloscope should also be set to 1X,
1X measures ± 40V voltage, 10X measures ± 400V voltage.
100uS is the horizontal time base, which means 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 theleft 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 ofthe screen:

Oscilloscope probe
Insert the oscilloscope probe with 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 themeasured point on the screen.
Notice
The attenuation factor of the probe should match with the voltage of the measured signal, and the voltage
signal exceeding the maximum range cannot be measured.
When measuring signals exceeding the safe voltage, must not touch the exposed metal parts of the instrument
to avoid electric shock.
4.4 Operation and function description of the signal generator

4.5 Toolbox

On the home page, short press the left and right keys to switch to the toolbox, and short press the conﬁrmation
key to enter the toolbox page as shown in the ﬁgure.
There are 6 functions to choose from:
Continuity test
Voltage testDS18B20 digital temperature test
DHT11 temperature and humidity test
Infrared decoding
Automatic calibration
Short press the up and down / , 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 resistancetests. If the circuit is 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 testlines.
DS18B20: Follow the prompts on the screen to insert the temperature sensor into the test socket formeasurement.
DHT11: Follow the prompts on the screen to insert the temperature and humidity sensor into the test socket formeasurement (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 will be displayed anddata code, and display the corresponding infrared waveform. If the decoding fails or cannot be decoded, theuser code and data code will not be displayed. At this time, 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 theprompts, and the calibration will start automatically. After disconnecting the short wires according to theprompts in 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

6.FIRMWARE UPGRADE

Open the upgrade software on the host computer, connect the computer and the device with a USB cable, thenwhile pressing ▼ key, press the power key 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 onthe right. In trigger mode, press the up and down keys to adjust 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 theDC coupling mode, there will be an upward or downward oﬀset straight line waveform, if it is AC coupling, nomatter 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. Theseharmonics are superimposed, so a distorted sine will appear on the sine wave, which is a normal phenomenon.
General mains waveforms are all distortion, nothing to do with 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 test 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 whenusing it for a long time in order 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 becharged 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 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 theprobe.

9.Contact USAny FNIRSI’ users with any questions who comes to contact us will have our promise to get satisfactory solution +an Extra 6-Month Warranty to thanks 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-mailfnirsioﬃcial@gmail.com (Business)fnirsioﬃcialcs@gmail.com(Equipment service)
Tel0755-83242477 / +8613536884686
http://www.fnirsi.cn/

http://www.fnirsi.cn/

http://www.fnirsi.cn/

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Documents / Resources

FNIRSI DSO-TC3 Digital Multimeter [pdf] Instruction Manual
DSO-TC3, DSO-TC3 Digital Multimeter, Digital Multimeter, Multimeter

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