RPMmtr 4+
RPM Tachometer based on Sound
Andreas Bartl
Designed for iPhone
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- $1.99
iPhone Screenshots
Description
Measure RPM from machine sound
Engines, motors and rotating machinery generate periodic sound patterns. RPMmtr analyses those sound patterns to measure RPM (rotational speed) based on state-of-the-art signal processing technology.
The result of this estimation is shown in three different views. The tachometer view displays the rotational speed at a glance. The color of the dent indicates how clear the measurement is. You can swipe the red ring control and improve the result by specifying the expected RPM range.
The tracking view shows the evolution of the rotational speed over time. The accuracy of the measurement is indicated by the size and color of the circles.
Experts can use the spectrogram view: the graph shows the frequency distribution of the sound. Small arrows show the rotational speed. Adjust the axes scaling by a swipe with one finger.
Notice on usage:
The app can estimate the correct rotational speed only in cases if the sound is very clear (i.e. the rotating device generates clear periodic sound patterns with one frequency) and there is no background noise.
RPMmtr is for educational purposes only. We do not take responsibility for decisions taken by the reader based solely on the information provided in this app.
What’s New
Version 1.5
- Analysis quality warning
- Predefined suggestions for RPM ranges
- Correction factor for dominant harmonic order
Ratings and Reviews
No adjustments for cylinders
I was trying to use this for a motorcycle. There is no way to adjust for number of cylinders to get an accurate number. My assumption is it was counting each sound to get the number so I divided by two to get 1200 rpm at idle as it was reading 2400.
Developer Response ,
Thanks for the feedback. We added a setting for accounting for the harmonic order. I hope that helps with your problem.
Doesn’t Work As advertised
This app simply does not work as advertised. Even though it’s cheap, I wouldn’t recommend it! I tried using this app to measure the idle RPM’s on my single cylinder motorcycle so I can set the air/fuel screw correctly. No matter what settings I change it says that my bike is running around 5000+ RPMs at idle!! That’s simply not possible seeing my bike red lines at 8000 RPM! The developer commented on my last review saying they fixed some few things that should help but it did not!! I still feel like I completely wasted of money on this app because IT DOES NOT WORK CORRECTLY!!!!
PLEASE FIX THIS APP SO IT WIRKS CORRECTLY!!!!!!!!!!!!!
Developer Response ,
Thanks for your feedback. We updated and improved the algorithm in the new version. Maybe it helps to solve your problems with the app.
Seems to apply a correction factor?
I like the function of this app but it seems to assume I am measuring a 4 cylinder engine and the output is divided by 4. Can you make a setting to adjust this?
Actually I am trying to measure the vibration of some consumer electronics so I want 1:1 output.
Developer Response ,
Thank you for your feedback. We added a setting for accounting for the harmonic order. That should help for the 4 cylinder problem.
For the consumer electronics problem: do you need to have the dominant vibration frequency?
App Privacy
The developer, Andreas Bartl, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Information
- Seller
- Andreas Bartl
- Size
- 728.1 KB
- Category
- Productivity
- Compatibility
-
- iPhone
- Requires iOS 14.4 or later.
- iPod touch
- Requires iOS 14.4 or later.
- Mac
- Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
- Apple Vision
- Requires visionOS 1.0 or later.
- Languages
-
English
- Age Rating
- 4+
- Copyright
- © 2019 Andreas Bartl
- Price
- $1.99
Supports
-
Family Sharing
Up to six family members can use this app with Family Sharing enabled.