Bug: First 1-4 analog samples are 0 and ramping up before data is reliable

[BitBob]

Do you have a network connection on your PC?

See the warning:

… looks like you don’t have a calibration file installed for your specific Logic hardware.

You can manually download/install the calibration, following:

Device Calibration | Saleae Support

If you want a deeper dive into the analog filtering & calibration settings, see this post:

Saleae Logic2 Analog filtering technical details?

I am trying to understand the technical limitations of Saleae Logic’s analog inputs. I am aware of the support articles: “In addition to the hardware AA filter, there is a digital-analog filter that engages for sample rates lower than the advertised sample rate. This is called the decimation filter. It will filter the data further before down sampling so data sampled at lower rates does not suffer from aliasing from frequency components that made it through the analog AA filter.” “To accu…

(You can optionally ‘hack’ the calibration file to increase the analog bandwidth / reduce the filtering applied)

However, without any calibration file, you can get strange behavior as described above. In particular, you likely don’t have a mGroupDelay setting that aligns the analog/digital timing for your specific device/filtering settings, nor do you have a mImpulseLength setting that should ‘trim’ the leading analog samples and avoid the behavior you’ve described.