Note: this Module requires a specific license in addition to the basic HScope license.
What You Can Do
The Automotive Module provide a set of tools specifically made for Automotive diagnostic. It allow you to:
1. Continuous Long-Time Recording
The Automotive Module allows lengthy and continuous real-time acquisition at lower sampling rates. Although this acquisition method is usually used for car diagnostics, it can be used in several other applications. Max sampling rate varies by oscilloscope.
2. Labels Tool
This tool is useful to perform the relative compression test. You can set any number of cylinder and their firing order and compute power.
3. 360-720° Tool
This tool allow to add the overlay of 720 degrees of crankshaft rotation in pressure waveforms. A middle cursor is moveable to allow relative measure of the angle. An option button allow to use different visualizations.
General workaround for issues: delete and reinstall the app.
License Activation problems found for some phones. Workaround: remove/close the app from Android tasks list and restart the app. Restart the phone and keep internet on the first time to let Google Play to sync the account.
Wifi oscilloscope disconnect randomly, also during logging. Workaround: disable bluetooth since when some paired device is nearby the Android system stops all the apps, including HScope.
TODO List
Advice for low sampling rate respect signal frequency.
Reference signal cannot enabled when HS101 connected by Bluetooth.
Add legend to cylinders timing overlay.
Enable CH-0 move on Automotive Module
Statistics hide away when the signal change –> keep on the screen
AUTO option in Rate (change according zoom level)
On saved file add information on enabled digital channels
2.4.6 (506 Beta) Oct, 2025
Current issues
When WiFi is enabled in HScope and no device is connected the file opening crash. Workaround: connect an oscilloscope or disable WiFi in HScope settings.
Improvements
Fixed bugs
Statistics not correct for filtered signals
2.4.6 (505) Oct, 2025
Improvements
Improved 360/720 degrees tool (default set to 720 deg. tool). Design improved.
Removed brown background when open waveforms
Sound Effects may be enabled or disabled
Improved frequency calculation
Removed brown background when loaded waveforms
720 degrees tool has 2 middle cursors (Update 2025)
Added Waveform title on the screen after Waveform loading (Update 2025)
Extended sampling rate range for ToolTop OS_5C oscilloscope
Fixed bugs
Fosc 53C could not show data after connection in some case
FFT could not appear for loaded waveforms
Histogram fixed for some case
Cloud waveform could not be loaded in Automotive Module
2.4.6 (497) Sep, 2025
Improvements
Waveform search returns results also from HScope Cloud
This Module license is in addition to the basic HScope license for the supported oscilloscope model.
What You Can Do
The Audio Output Module allow to:
1. Import WAV Files
WAV Files can be imported, analysed, processed and exported in HScope.
2. Hear on the Phone the Signal from the Oscilloscope
The oscilloscope signal can be sent to the phone speaker through real-time data streaming. While hearing the signal you can still analyse the signal with the other functions. Since the oscilloscope can acquire low voltages this function is useful to check low signals in initial amplifier stages.
Note: this function is not supported by all the oscilloscopes. Check your model under theoscilloscopes list.
3. Compute the Output Power of an Audio Amplifier
The Audio Module can compute the output Power (RMS Power) of a Audio Amplifier by connecting the probe to the speaker connections and by selecting the impedance of the speaker in HScope. The maximum power is indicated in the Audio module panel and depends from the oscilloscope maximum input voltage. For increasing it, set a higher oscilloscope input voltage or use a x10 / x20 / x100 probe. The result is shown in real-time on the graph under the RMS value. For this measure you should input a sine wave in the amplifier. This signal could be produced by a portable MP3 player or by another phone App.
Pay attention: the sound generator cannot be the same phone running HScope since it cannot share the same GND of the oscilloscope.
Pay attention: the output of an audio amplifier could have high voltages. The GND of the probe should be connected to the GND of the amplifier or to the speaker wire connected to the GND. If both speaker wires are floating (neither one on GND), then the oscilloscope GND and phone box could be at a dangerous voltage. In this case you may look to some insulation solution like to use capacitors in series both to the probe tip and to the probe GND. (see EEVBLOG)
4. Compute the THD of the Signal
For pure sinusoidal signals you can compute the Total Harmonic Distortion.
5. Input data from Microphone
You can acquire data from microphone input. Available only on phones with at least Android 6.0.
This module is not supported by all the oscilloscopes and it is not supported in the same way. Check more under each oscilloscope page.
The Automotive Module allows lengthy and continuous real-time acquisition at lower sampling rates. Although this acquisition method is usually used for car diagnostics, it can be used in several other applications. Max sampling rate varies by oscilloscope.
Before You Start
The Automotive Module license is in addition to the basic HScope license for the supported oscilloscope model.
The minimum requirement for this module is a device with 4GB RAM or more.
1. Start Recording
Rate and channel parameters to be configured prior to a recording start.
Maximum recording time is sample rate dependent and displayed under the recording button.
Recording automatically starts when a significant change in the input signal is detected.
After the recording start the parameters cannot be changed unless you run a new recording.
2. Analyze The Data
Recorded data can be zoomed and scrolled with fingers. Cursors appears as you click with 1 or 2 fingers on the horizontal axis.
Labels Tool
This tool is useful to perform the relative compression test. You can set any number of cylinder and their firing order. Example below:
720° Tool
This tool allow to add the overlay of 720 degrees of crankshaft rotation in pressure waveforms. Pink cursor is moveable (on bottom part). By clicking on the gray labels is possible to show or hide the text.
Annotations
Coming soon
Cylinder Timing Overlay
This overlay allow to visualize the cylinder status at a certain time. More info in the following demo.
Test on Cylinder Firing Order
3. Import / Export
This module allow export and import of waveform in an efficient open format. Waveforms are saved in .zip format in the following phone folder: /Download/HScope/Automotive Users can share the saved waveforms just by copying from and to this folder. Filenames can be changed with Android file explorer. Waveform preview is available to remember the waveform before importing.
Import / Export Tool
Other
Hardware Limitations
This functionality is not commonly found in commercial oscilloscopes which are mostly ‘memory based’ and not ‘data streaming based’. Continuous Data Acquisition capability and speed depends strongly on hardware architecture of each oscilloscope model and the ability to ‘overclock’ its drivers.
For example the Hantek 1008 allows a maximum rate of 2KSa/s with this module, sufficient for crank position sensor diagnostics. HS10X DIY Oscilloscope Series allow up to 100KSa/s. FX2 Chipset based oscilloscopes allow a maximum continuous sampling rate up to 125KSa/s.
Note: this Module requires a specific license in addition to the basic HScope license.
What You Can Do
The Audio Output Module allow you to:
1. Import WAV Files
WAV Files can be imported, analysed, processed and exported in HScope.
2. Hear the input signal from Channel-1 on phone
The oscilloscope signal can be sent to the phone speaker through real-time data streaming. While hearing the signal you can still navigate in the Oscilloscope graph or switch to the FFT graph. It works at sampling rates 25KSa/s and 50KSa/s. Since the oscilloscope can acquire low voltages this function is useful to check low signals in initial amplifier stages.
Note: this function is not supported by all the os
3. Compute the Output Power of an Audio Amplifier
The Audio Module can compute the output Power (RMS Power) of a Audio Amplifier by connecting the probe to the speaker connections and by selecting the impedance of the speaker in HScope. The maximum power is indicated in the Audio module panel and depends from the oscilloscope maximum input voltage. For increasing it, set a higher oscilloscope input voltage or use a x10 / x20 / x100 probe. The result is shown in real-time on the graph under the RMS value. For this measure you should input a sine wave in the amplifier. This signal could be produced by a portable MP3 player or by another phone App.
Pay attention: the sound generator cannot be the same phone running HScope since it cannot share the same GND of the oscilloscope.
Pay attention: the output of an audio amplifier could have high voltages. The GND of the probe should be connected to the GND of the amplifier or to the speaker wire connected to the GND. If both speaker wires are floating (neither one on GND), then the oscilloscope GND and phone box could be at a dangerous voltage. In this case you may look to some insulation solution like to use capacitors in series both to the probe tip and to the probe GND. (see EEVBLOG)
4. Compute the Audio Distortion (THD+N)
The primary job of any audio device is to faithfully reproduce or transmit the audio signal that is input to it. An ideal, linear audio device will produce an output signal that is an identical scaled version of its input signal. Anything that alters the input signal in any way, other than changing its magnitude, is known as distortion.
A classic means of detecting audio signal distortion is to stimulate a device under test (DUT) with a pure sine wave and then conduct a spectral analysis of the DUT output. Sine waves are used because a pure sine signal has the unique property that all its energy is concentrated at a single point in the frequency spectrum. This makes it easy to analyze the output from the DUT for unwanted distortion components. When a single sine wave is used as the stimulus, nonlinearities in the DUT cause harmonic distortion, wherein distortion components occur at harmonics (integer multiples of the sine signal’s frequency, or fundamental frequency).
Total Harmonic Distortion Plus Noise (THD+N)
The THD+N technique is the most common method of measuring harmonic distortion. In its basic form, it is implemented with a sharp notch filter tuned to the fundamental sine frequency, a bandwidth limiting filter, and an rms level meter. The notch filter removes the fundamental sine signal, leaving a residual signal which consists of the harmonics and noise. The THD+N Ratio is calculated as the bandwidth limited rms level of the residual divided by the rms level of the entire signal.
Samples for testing
If you want to test the THD processor you can import WAV files with known distortion. For example the file you can find at this link.
This module is available just for few oscilloscopes as:
Loto Oscilloscopes (OSC 482, OSC 802, OSC A02)
Hantek 6022 (BE & BL)
HS10X & H40X DIY Oscilloscopes
HS502
It allow to use the output calibration pin (generally set to 1KHz square wave) to generate a PWM output signal. Max frequency and duty cycle range depends on the device (detail are in each oscilloscope page).
You can use this module only when the first 2 channels are active. Channel-1 → plotted on X axis Channel-2 → plotted on Y axis
Features
Real-time processing
Fading graphic effect
Big graph space
On the left you can see 5 periods of both channel signals with the information about amplitude and frequency.
On the right there is the XY Plot with comparison information of the two signals. The phase shift is calculated with the Lissajous method and it is valid just for Sinusoidal Waveforms with same frequency.
Calculation of Time Delay
If you want to calculate the time delay for an arbitrary signal from 2 points of a circuit under analysis, just press the yellow/blue text and you will see this value obtained from the Cross-Correlation of the two signals.
Invert the Signals
If you want to invert one or both the signals, just Invert it in the Filter panel available for each channel.
Proof of Concept
The following video show the real-time capacity of this module.
Screenshots
Comparison test between HS-402 and Tektronix-465 oscilloscopes with PNP and NPN transistors.
Images of courtesy from @Jim in @HScope Telegram group
Clicking on FFT button is possible to see the rapresentation of the signal in the Frequency Domain only for the first Channel. The range of visible frequencies on screen can be selecting zooming-in or out with the fingers on the screen.
Activating the STATS button is possible to see the top 3 frequencies in the selected frequencies range. These values are corresponding to the computed FFT values and not to the real values that can be checked better with the ruler.
FFT Windows
It is possible to select between standard windows and Flat Top windows for the FFT. Flat Top windows (HFT90D and HFT248D) are used when is required to determine the exact amplitude of a sinusoidal component in the input signal. They have bandwidths W3dB of about 3 . . . 5 bins, roughly twice as wide as non-flat-top windows with comparable sidelobe suppression, but very low maximum amplitude error emax.
WINDOWS SUMMARY
Bartlett
W3dB = 1.2736 bins emax = −1.8242 dB = −18.9430 %
Hanning
W3dB = 1.4382 bins emax = −1.4236 dB = −15.1174 %
HFT90D
W3dB = 3.8320 bins emax = −0.0039 dB = 0.0450 %
HFT248D
W3dB = 5.5567 bins emax = 0.0009 dB = 0.0104 %
Sample FFT Windows
Harmonic Cursor
When you use one single Vertical Cursor in the FFT module, it will show also the Harmonics of the selected frequency, up to the 10th harmonic.
To add a math channel, just click select MATH in the modules and you will see the Math configuration panel. You can quickly select one of the built-in functions, such as inversion or addition. All the standard arithmetic functions are supported along with more complex functions like demodulation and instant frequency of the signal.
With HScope currently you have available only 1 math channel.
List of functions
Basic functions:
– A (invert) A + B (sum) A – B (difference) A x B (multiply) A : B (divide)
Advanced functions:
demod (demodulation) freq (instant frequency)
Amplitude Demodulation
For some signals (for example from vibrations sensors), the information is carried by the amplitude (or envelope) of the signal. The demod() function allow to do this operation. Following is the equivalent circuit of this operation.
Envelope Detector
Instant Frequency
Visualize the instant frequency variation of the signal along time. The freq() function is useful for signal where frequency variation bring the useful information.
Sample application of this function to detect missfire with Automotive Module (detected 1 missfire event during long period recording):
Credits
freq() function (or Instant Frequency) has been developed with the support of: Denis, Ravindra
This setup has been made with a Raspberry Pi 4B inside a Argon ONE case. Attached are several pictures of a HS101 BLT, HS101 and HS402 all in action. The PI 4B has built in Bluetooth so it is possible to connect up the HS101 BLT.
Install Android 11 on Pi4
Here is the link to the Lineage OS 18.1 which is android version 11.
Here is link to google play store that will need to be installed. Dave found it easier to put the file on a USB drive and recommend putting this file on a separate USB drive for use later in the installation.
Tips
Install Android to microSD or to external SSD that uses USB. I tried a USB stick and android kept locking up.
Put the Google Play store file on a USB stick. I had significant issues trying to download the play store onto the Raspberry. Using a PC to download Google Play store and having it on the USB stick allowed installation per leepspvideo.
I tried separate USB mouse and keyboard. Mouse wouldn’t work. I had to use a logitech K400+ integrated touchpad and keyboard.
There is no pinch zooming. Its android thing. I mention this because you can double left click on the oscilloscope trace and HScope will zoom right in. But you have no way to zoom back out. What I learned to do was to toggle through “Auto/Norm/Single” selection. Then hit the play button. Then the trend zooms back out.
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