I'll post some screenshots for better clarity at 1M
![Ohms \$\Omega\$](https://www.eevblog.com/forum/Smileys/default/omega.gif)
and 50
![Ohms \$\Omega\$](https://www.eevblog.com/forum/Smileys/default/omega.gif)
output settings...
Screenshots as promised
SDS1102X DSO
SDG1062X (same UI as 2042X and very similar specs.)
Pulse for better indications of current loadings when properly terminated.
Ch 2: Tek P6021 AC current probe. (values seen may not be correct (attenuation) but waveform is indicative of what's happening)
Shot 1 with only 50
![Ohms \$\Omega\$](https://www.eevblog.com/forum/Smileys/default/omega.gif)
scope internal termination.
Waveform is identical with either 50 or 1M
![Ohms \$\Omega\$](https://www.eevblog.com/forum/Smileys/default/omega.gif)
sig gen source impedance. Only the sig gen displays a difference depending on the source impedance selected.
![](https://www.eevblog.com/forum/testgear/the-siglent-sdg2042x-thread/?action=dlattach;attach=300538)
Next is entirely different, the source is always 50
![Ohms \$\Omega\$](https://www.eevblog.com/forum/Smileys/default/omega.gif)
from the sig gen (explained earlier) but the termination impedance
matters.
![](https://www.eevblog.com/forum/testgear/the-siglent-sdg2042x-thread/?action=dlattach;attach=300540)
Tiny current spikes can be seen on rising and falling edges....clear on the display but not so in the screenshots.