| Electronics > Beginners |
| SDS1104x-e AC Coupling offset |
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| rf-loop:
Here is roughly 30V DC (29.4530 - 29.4540 (Keithley2015THD)) from some PS3005 output using Banana-BNC adapter and splitted using BNC T's and connected to all inputs using coaxial cables. This is how it works when all is ok. First image all inputs AC coupled. Ripple observed using 5mV/div Trig DC rising edge CH1. (also tested trig AC coupling and works also rock solid of course) Next image exactly same input signal. All channels DC coupled and now 10V/div. (Sidenote but not for this OP's case here: For randon readers it need note that Siglent AC coupling HPF corner frequency is extremely low (look Performa01 made high quality depth review) so if signal have some even rare unsymmetric components it of course may produce "offset" like effect and this may happen also so that in worst case this part of signal is not visible on the screen because this happen in analog front end where signal affect all time independent of acquisition periods.) |
| Steamer:
Here are my results connecting 4 probe's together, I didn't have BNC T couplers. First at 25 volt, second at 27 volt, third at 28 volt, and the last at 29 volt dc. All is not ok, I'm going to recalibrate it again, but I don't think that will help. (Edit: it didn't help) :-BROKE |
| StillTrying:
I think the last few screen shots are enough to prove Ch 3 & 4 are faulty at least on AC coupling. As it doesn't seem to be there on 200mV/Div, is it worth using the fine Y control between 200mV to 100mV to see where it actually starts. |
| Steamer:
The problem starts right at the change from 120mv/div to 118mv/div, and that is when you hear a relay clicking. |
| StillTrying:
So what was it ? Leakage on the PCB from the raw input to the <120mV range components is about all I can think of! |
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