Greg, Yes, the trigger levels are near zero when the LEDs are flashing. The level pots are both at 1 o'clock, instead of 12 o'clock, however.
There does seem to be a problem with the preset trigger postition. Although the display shows 0.00V when at preset, I don't think it is. When I manually set the levels to 0.00V, the TI shows 100nS. At preset levels, the TI is noticeably higher. Joe Gray KA5ZEC On Sat, Oct 10, 2009 at 2:08 PM, Greg Burnett <[email protected]> wrote: > Joe - When you manually set the trigger level pots to the center of the > triggered range (as indicated by flashing trigger LED), does your digital > display indicate trigger levels near zero volts? That is what's important - > and what might be way off if you have DC bias problems in the front-end. If > you have that problem, typically it will be in one channel only, although it > could of course be in both. > > Greg > > > ----- Original Message ----- > From: "Joseph Gray" <[email protected]> > To: "Discussion of precise time and frequency measurement" > <[email protected]> > Sent: Saturday, October 10, 2009 12:42 PM > Subject: Re: [time-nuts] 5370A > > > Greg, > > I did your test and at the 12 o'clock position, both levels read > -0.32V. Zero volts is at about 1 o'clock. With the attenuator switched > in, the range on the pots is fairly sharp. > > Thanks for the tip. I'll add the DC bias adjustment to my list. > > Joe Gray > KA5ZEC > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
