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Re: 7T11 trace shifting left as time/div rotated.

 

Yes, the measurements ware taken with both the coarse and fine "time position" controls fully clockwise, but that gives me something extra to check on tomorrow.

Regards,
David Partridge

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Albert
Sent: 22 January 2012 16:33
To: TekScopes@...
Subject: [TekScopes] Re: 7T11 trace shifting left as time/div rotated.

Hi David,
The start and stop levels should differ about 5 V. With start I (and you also I think) actually mean the stop level when the trace is at the left position. On the test scope you look at vertical position of the horizontal lines.
It depends of Time Position. The graph 11 is for fully CW. If you rotate to fully CCW then the whole patter shift 5 V lower, from -5 V to -10 V.
Albert



Thinking rather more about this, the start voltage of -2.22V for the TTH Miller circuit doesn't sound right - from all my reading in the manual I think it should be starting at 0V, and the screen shots in the manual also suggest this. The waveforms shown for the Horiz. Amp. also suggest that there's no (or very little) DC offset.

Comments?

Thanks again
Dave



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