Sorry, I didn't read all your updates but it looks like the Arb is still in question. When you show these glitches, what is the dv/dt? I'm not sure when looking at your graphs what the units are.
Sorry, I didn't read all your updates but it looks like the Arb is still in question. When you show these glitches, what is the dv/dt? I'm not sure when looking at your graphs what the units are.Hi Joe, the problem with the AWG is the at a single step transition from 2663 to 2664 it output drops 2mV instead of rising. I really dislike this, so I’ll be automatically investigating all the glitches on the same ramp to get an idea of what they have in common. So it seems side tracking on a side track. But because the thread is not really about the the diode and resistor divider, but more about using the AWG and DSO as tools to investigate, I’ll keep things bundled here.
I guess I could still use the AWG to do better measurements, because the output affects both curves the same way. Time based averages should then be done over the same time ranges for both curves. (So the glitches are also included in the same averages.)
Also the glitches are 2mV, over a very short period of time, so it affects the slope much more than absolute values. Using function fitting I could for instance work around that.
Sorry, I didn't read all your updates but it looks like the Arb is still in question. When you show these glitches, what is the dv/dt? I'm not sure when looking at your graphs what the units are.Hi Joe, the problem with the AWG is the at a single step transition from 2663 to 2664 it output drops 2mV instead of rising. I really dislike this, so I’ll be automatically investigating all the glitches on the same ramp to get an idea of what they have in common. So it seems side tracking on a side track. But because the thread is not really about the the diode and resistor divider, but more about using the AWG and DSO as tools to investigate, I’ll keep things bundled here.
I guess I could still use the AWG to do better measurements, because the output affects both curves the same way. Time based averages should then be done over the same time ranges for both curves. (So the glitches are also included in the same averages.)
Also the glitches are 2mV, over a very short period of time, so it affects the slope much more than absolute values. Using function fitting I could for instance work around that.I can tell you this is under investigation at the factory for ~1 week now.
Dunno about progress or outcome yet.
Thanks for all your work.
Hi Joe, the problem with the AWG is the at a single step transition from 2663 to 2664 it output drops 2mV instead of rising.
-32301
-21373
-14817
-03893
02663
13591
20147
31075
The full dataset cannot be shown in a graph using Excel and Visio, but what also can be seen is that the other negative spikes become less around 0 and then become positive spikes.02663-000101001100111-000101001101000
13591-011010100010111-011010100011000
20147-100111010110011-100111010110100
31075-111100101100011-111100101100100
-32301 10928
-21373 6556
-14817 10924
-3893 6556
2663 10928
13591 6556
20147 10928
31075
Something repeating can be seen. Which could maybe give us some clue!At the higher amplitude, can you describe what about it is behaving weird? I'm curious what the min and max output range you are seeing is, It would be interesting if it was using both dac's to hybridise the output. or even if the output span was higher than 6V pk-pk
It would be interesting if it was using both dac's to hybridise the output. or even if the output span was higher than 6V pk-pk
Just nice to know, how does the AWG's amplitude (6V pk-pk) go above the 5V usb connection? A boost converter?
Main sample DAC: http://www.ti.com/jp/lit/ds/symlink/dac904.pdf
Here's some more information on offscreen voltages.
At the examples I start zooming in from 1000 mV./Div until 100 mV/Div. At 100 mV/div it should go offscreen but it becomes in view again.
This something that happens when there's a larger "area" (duty of square changes the effect) of voltages are "above the screen".