E
Eeyore
- Jan 1, 1970
- 0
I've been struggling with this utter POS scope again (it seems determined to
trigger on any HF energy and reject LF for example) and ended up dragging my old
CRT scope along in its place.
When I got a trace on the conventional CRT scope that made sense / I could use
(long story there) I decided to see if the TDS 210 could redeem itself. I hooked
it up to the audio analyser we were using and it 'upset' things.
I detached the BNC lead between the bTDS210 and the audio meter and it calmed
down again. On attempting to re-attach it both I and my colleague saw a tiny
blue spark. Simply touching the BNC bodies together caused this.
I measured 0.15mA leakage current from the TDS210 ground to our EUT ground yet
there is apparently continuity (0.1 ohms) from the TDS210 BNCs to the mains
earth pin on the power lead. I've noticed before that it causes trouble when
hooked up to other gear btw.
Any thoughts (aside from having it checked). I noticed there was a recall on
these for an earth problem but I can't see how it relates to what we're seeing
here.
Graham
trigger on any HF energy and reject LF for example) and ended up dragging my old
CRT scope along in its place.
When I got a trace on the conventional CRT scope that made sense / I could use
(long story there) I decided to see if the TDS 210 could redeem itself. I hooked
it up to the audio analyser we were using and it 'upset' things.
I detached the BNC lead between the bTDS210 and the audio meter and it calmed
down again. On attempting to re-attach it both I and my colleague saw a tiny
blue spark. Simply touching the BNC bodies together caused this.
I measured 0.15mA leakage current from the TDS210 ground to our EUT ground yet
there is apparently continuity (0.1 ohms) from the TDS210 BNCs to the mains
earth pin on the power lead. I've noticed before that it causes trouble when
hooked up to other gear btw.
Any thoughts (aside from having it checked). I noticed there was a recall on
these for an earth problem but I can't see how it relates to what we're seeing
here.
Graham