JYE Tech Forum

Hello, please help.
The oscilloscope on a test signal of 10 kHz shows such a picture. Measurements of voltage in control points as in the diagram. At the point VB +0.33 V instead of +0.6 V.
The device is programmed with 061 firmware from the site through the J4 connector.
Prompt this software or hardware error. What could be the malfunction?
P.S. The device worked fine before the firmware.

Can you change timebase to 50us or so and try again? For 10KHz signal 10ms timebase is too slow. The waveform could be false due to the low sampling rate.

VB being 0.3V is too lower. This voltage is independent to firmware. It is suggested to double check if it was correct before you changed the firmware.

Here are new measurements
20ms 50ms 0.1s And this shows the working oscilloscope While I did not change the firmware, the VB signal was not measured.
I checked the entire input path there signal is normal. Further ADC converter. I do not know what to do. This is an ADC or processor.

The signal frequency is about 100Hz instead of 10KHz. A different signal?

These are two different oscilloscopes. On oscilloscopes, the signal from the built-in oscillator. And on all dimensions 10 kHz.

And where does the VB signal come from?

VB is one of reference voltage for ADC TLC5510 (U3). It is a DC voltage around 0.6V.