AX-7 Oscilloscope for Android

11 things about AX-7 Oscilloscope

1. The live view shows the incoming signal (from the device microphone or external sensors) and you can push the HOLD button at any time to freeze the waveform.

2. Pushing the FFT button enters the frequency display screen, where the incoming waveform is split into its constituent frequencies.

3. Then push the TRIGGER button and the app will scan the incoming signal and freeze the signal when the trigger level is reached.

4. This mode outputs a sine wave sweeping smoothly through the frequency range over a full minute, and analysing the resulting input signal.

5. When the waveform is frozen, pushing the HOLD button saves it to the background, displayed in yellow.

6. Set the trigger level by swiping up and down in the waveform display area.

7. When zoomed in to a waveform, swiping left/right in the display lets you move around the sample.

8. If you have a saved yellow wave, swiping left/right at the top of the display area moves the yellow sample independently.

9. The screen is calibrated with a vertical line for every 2000Hz increment, so it's easy to see at a glance with frequencies are present in the signal.

10. If you want to identify the most prominent frequency automatically, just push the DETECT button.

11. This is very useful when setting up live sound, letting you know exactly which EQ band needs to be reduced to stop feedback etc.