Faultfinding an I2C databus

Instruments HPS140 Handheld Pocket Oscilloscope
1

Hi all,

I have just got the HPS140, liking the look of the 40MS/s.

I a trying to read the bits on an I2C databus but it keeps missing the first few. I have set the trigger what I think is properly, on falling slope etc, but the display starts halfway through a byte. It will not let me scroll left on the x-axis.

Any idea what I can do to display the first few bits on the initial trigger?

Thanks,

Si

2

There is a small delay in time between the trigger point and the point where the unit starts displaying samples, due to the fact that some code needs to be executed when a trigger event is detected. This could be the cause of the problem.

3

I have a 50’s Fender amplifier with 2x 6L6 tubes, and I would like to adjust the bias visually with the oscilloskope, is that in anyway possible with the HPS140?

4

It depends on the kind of signal.
What is the max frequency and level of the signal you would like to measure?