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In Reply to: RE: traces at last.... posted by elblanco on October 24, 2016 at 12:32:16
It was already in the ac position. I moved it to the ground position and it changed to a flat line, and then I moved it to dc and got exactly the same trace as in the ac position. I then switched the probe to channel 2 and got exactly the same results. I have a feeling you guys are going to tell me that is not what should have happened. : )
Follow Ups:
Right - the output should be AC only. If you are in GND, then you just get a flat line: this position is there so you can use your vertical adjust to put that one one reference grid. If you had then, let's say 2.5v DC AND your AC signal, putting on DC would make the trace shift up by one division (2.5v) - essentially a combined AC and DC volt meter.
If you have the input shorted then your original posted wave is the results of all the odd artifacts added by your amp because, what I don't think has been posted, is that when the input is shorted, the output should (ideally) be a flat line: no AC, no DC. I agree with someone who suggested this is from the heater arrangement you have.
In a DHSET, you will likely NEVER have a completely flat line, but should be closer than what you have. If you move the time base to a faster and faster time, you may see those spikes become their own little sign waves on top of the dominant sign wave - an oscillation.
By the way, I don't know where you live, but I'm in the Portland, OR area and have the same scope. Happy to walk you through in more detail.
'thanks for the post. I am in NC, so there is a bit of country between us. The videos are helping a lot, so I hope to get the hang of it. Not sure what you mean by the heater arrangement I have; is there a better way to do it?
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