Zoom with cursors

[jom]

Hello

I'm new with the AD2 and I'm just getting started with the software (Waveforms 2015).  

I've been trying to find a way to measure both X and Y "deltas" using the zoom window.  It is obviously much easier to see where to place the cursors to measure the delta.  For the life of me I can't seem to be able to do it.  I have another dig scope I use that has this type of function so I thought it was rather common.

Thanks for any help you can give.

jom

EDIT to add: I'd also like to zoom vertically as well...is what I guess I'm asking for also.

[attila]

Hi @jom

The Zoom view does not not have cursors.
You could use the Quick measure (double click on plot or select from top-right corner of the plot measure:free/vertical/pulse), you can also use the X or Y cursors in the Scope main time view.

 

The Zoom view vertical adjustment is available on the left edge (drag with left/right mouse button) or in view options (gear in the top-right corner or context menu of the plot).

[jom]

Thanks

However, to get to smaller levels it is next to impossible to use the cursors without the zoom.  Assuming my picture uploaded: you can see the zoom on the right.  I want to measure the time step (this is a DAC output) and the Q level (vertical step) of this device.  It is difficult if you can't place the cursors with any accuracy.

How can I do this?

Thanks

jom

[attila]

Hi @jom

The Zoom view does not have cursors. The vertical scale position can be change with mouse left/right drag or wheel on the left edge of the zoom plot.

See 5mV - 2us /div:

The time base and channel range adjusted after acquisition:

 

[jom]

Thanks..this seems to work for me.  Thanks!

If I may ask another question here: what are the number of bits used to digitize the input to the scope?  I've been trying (as mentioned above) to measure a DAC output.  However, if the number of bits of a scope trying to measure is LESS than the actual DAC you won't be measuring the DAC "Q" levels but the scope itself.

Just curious.

Thanks

jom

[attila]

Hi @jom

The Analog Discover Scope DAC has 14 bit resolution. It has two gain steps for 5V and 50V pk2pk rage, ~0.3mV and ~3mV resolution.

For more details see the following page:
https://reference.digilentinc.com/reference/instrumentation/analog-discovery-2/reference-manual

[jom]

That's good news!  It means the reading I'm seeing from my DAC is no way related to the scope given the 0.3mV step.  My DAC is showing a much larger step...which is a problem for me but at least it isn't the scope I'm seeing.

Thanks for all of the help Attila.

jom