Why Use a Dual-Channel Oscilloscope? FNIRSI 1014D Malaysia
Why Use a Dual-Channel Oscilloscope? FNIRSI 1014D Malaysia
Why do you need a dual-channel oscilloscope?
If you only want to check whether one waveform is present, a single channel may be enough.
But during real electronics troubleshooting, technicians often need to answer a more useful question:
What happens to one signal compared with another?
The FNIRSI 1014D provides two oscilloscope input channels, allowing users to observe two suitable electrical signals at the same time.
This can be useful for PCB troubleshooting, electronics repair, Arduino and MCU development, amplifier testing and technical education.
What Does Dual Channel Mean?
A dual-channel oscilloscope provides two measurement inputs.
They are normally identified as:
CH1
and
CH2
Instead of observing only one waveform, you can display two waveforms on the screen simultaneously.
This makes comparison much easier.
Example 1: Compare Circuit Input and Output
One of the most useful dual-channel applications is comparing the signal before and after a circuit stage.
For example:
CH1 → Circuit Input
CH2 → Circuit Output
Suppose the input waveform looks normal but the output is distorted.
You immediately know that something between those two measurement points requires further investigation.
This can be useful when troubleshooting:
-
Amplifiers
-
Filters
-
Signal-conditioning circuits
-
Driver circuits
-
Electronic control boards
Example 2: Amplifier Troubleshooting
Consider an amplifier circuit.
You provide a known test signal to its input.
Connect:
CH1 → Amplifier Input
CH2 → Amplifier Output
You can now observe both waveforms simultaneously.
This may help you investigate:
Gain
Distortion
Clipping
Missing output
Unexpected waveform changes
The FNIRSI 1014D's built-in signal generator can also be useful for suitable amplifier experiments.
Example 3: PWM Control and Output
Dual channels can be useful when troubleshooting a PWM-controlled circuit.
For example:
CH1 → PWM Control Signal
CH2 → Driver Output
If the PWM signal changes correctly but the driver output does not respond, troubleshooting can focus on the driver stage or related circuitry.
If both signals disappear simultaneously, the problem may be elsewhere.
This gives technicians more information than observing one test point at a time.
Example 4: Microcontroller and Driver Circuit
Imagine a microcontroller controls another circuit through a driver.
The signal path may look like:
MCU → Driver → Load
If the load does not operate, connect:
CH1 → MCU Output
CH2 → Driver Output
If CH1 shows the expected waveform but CH2 does not, the fault may be located around the driver stage.
This is a practical way to divide a circuit into sections during troubleshooting.
Example 5: Compare Two Timing Signals
Sometimes both signals are present, but the problem is their timing relationship.
A dual-channel oscilloscope allows you to view both signals on the same time base.
For suitable circuits, this can help investigate:
-
Timing relationships
-
Trigger and response
-
Pulse delays
-
Control sequencing
-
Related digital signals
This is useful in basic embedded-system and control-circuit troubleshooting.
Example 6: Compare a Sensor Signal and Controller Response
Suppose a sensor sends a changing signal to a controller.
You may connect:
CH1 → Sensor Output
CH2 → Controller Output
When the sensor condition changes, you can observe whether the controller responds.
This can help answer:
Is the sensor producing a signal?
Is the controller receiving or responding to the event?
Does the output change at the expected time?
Again, the exact test method depends on the circuit.
Why Not Just Use One Channel Twice?
You can measure one point, remember the waveform, move the probe and measure another point.
But this has limitations.
The circuit condition may change between measurements.
You also cannot directly see the timing relationship between the two waveforms.
With dual channels:
Both signals are visible at the same time.
This makes comparison easier and can speed up troubleshooting.
Dual Channel for Good Board vs Faulty Board?
Normally, when comparing a good PCB and a faulty PCB, technicians may measure corresponding points one board at a time.
However, the dual-channel capability is especially useful when comparing two points within the same operating circuit.
For example:
Before a component or circuit stage
versus
After the circuit stage
This can help identify where waveform behaviour begins to change.
Dual Channel + Signal Generator
This is where the FNIRSI 1014D becomes particularly useful for basic electronics experiments.
A possible setup is:
Built-In Signal Generator → Circuit Input
Then:
CH1 → Input
CH2 → Output
You can generate a known signal and observe how the circuit modifies it.
This is useful for suitable:
-
Amplifier circuits
-
Filter circuits
-
Audio experiments
-
Signal-conditioning circuits
-
Electronics training
It provides a compact way to perform basic signal-generation and waveform-comparison experiments.
Is Dual Channel Useful for Arduino?
Yes.
For Arduino and MCU projects, two channels may allow you to compare:
PWM command vs circuit response
Input pulse vs output pulse
MCU output vs driver output
Trigger vs response
Clock vs related signal
This can be particularly useful when the software appears correct but the hardware does not behave as expected.
Is Dual Channel Useful for Power Supply Troubleshooting?
It can be.
For example, you may want to observe:
CH1 → Low-voltage supply rail
CH2 → Circuit output or control signal
If the equipment malfunctions, you can see whether the supply disturbance occurs at the same time.
You may also compare two suitable low-voltage power rails.
However, correct grounding is critical because oscilloscope channel grounds may not behave like two completely independent floating multimeter inputs.
Important: Two Channels Do Not Mean Two Independent Grounds
This is an important point for beginners.
Do not assume that CH1 and CH2 can always be connected like two separate floating multimeters.
On many bench oscilloscopes, the channel ground references are common.
Connecting ground clips to two different circuit potentials can create an unintended short circuit.
Before using both channels, always understand:
-
Circuit grounding
-
Oscilloscope grounding
-
Probe connection
-
Voltage levels
-
Input limits
This becomes especially important with mains-powered equipment and power electronics.
Single Channel vs Dual Channel – Which Is Better?
A single-channel oscilloscope may be sufficient if you mainly need to:
Check whether a waveform exists
Perform simple low-frequency measurements
Carry out basic hobby testing
A dual-channel oscilloscope becomes more useful when you need to:
Compare input and output
Compare control and response
Observe timing relationships
Trace signals through a circuit
Troubleshoot more complex PCBs
For repair work, the second channel can significantly improve troubleshooting flexibility.
Who Can Benefit from FNIRSI 1014D Dual Channel?
The FNIRSI 1014D may be suitable for:
-
Electronics repair technicians
-
PCB troubleshooting
-
Arduino users
-
MCU developers
-
Engineering students
-
Technical colleges
-
Electronics training centres
-
Hobby electronics
-
Basic R&D
-
General electronics laboratories
Its dual-channel capability is one of the main reasons to consider it over a simpler single-channel oscilloscope.
Looking for FNIRSI 1014D in Malaysia?
If you need to compare two electronic signals, troubleshoot PCB signal paths or test input and output waveforms, the FNIRSI 1014D Dual-Channel Oscilloscope with Signal Generator may be worth considering.
For FNIRSI 1014D enquiries in Malaysia, contact MTM Precision Sdn Bhd.
Not sure whether two channels are useful for your application?
WhatsApp us a photo of your PCB, equipment or intended measurement.
MTM Precision Sdn Bhd
Showroom & Service Centre:
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia.
Tel: 03-8080 7172
WhatsApp: +6016-660 7346
Email: mtmpre@yahoo.com
Website: www.mtmpre.com.my
Serving customers across Selangor, Kuala Lumpur, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kelantan, Terengganu, Kedah, Perlis, Sabah and Sarawak.
05 Oct 2026
