Re: [time-nuts] 53132A triggering

Well I have looked into this before for the 53131A, and the way signal peak volts is implemented is bizarre. I say bizarre because for low frequency, low duty cycle signals (like PPS) the 53131A will at times report the lower peak as being higher than the upper peak... >From the 53131A Manual:

Re: [time-nuts] 53132A triggering

Hi Set it up on your 53132 and see what happens … Bob > On Sep 16, 2016, at 8:35 PM, Scott Stobbe wrote: > > For a low duty cycle pulse, the ac coupled signal will be approximately the > same as if it were dc coupled. Not sure I follow what you mean. There will > be

Re: [time-nuts] 53132A triggering

> For a low duty cycle pulse, the ac coupled signal will be approximately the > same as if it were dc coupled. Not sure I follow what you mean. There will > be only one rising edge for a narrow pulse ac coupled, as the falling edge > occurs much quicker than the HPF time constant. If there is

Re: [time-nuts] 53132A triggering

Bob wrote: Most PPS signals these days are very low duty cycle. If you AC couple them, you can easily be triggering on the wrong edge. ??? All of the triggers I'm familiar with have slope selection (rising edge/falling edge), and in my experience HP counters do not have problems mistaking

Re: [time-nuts] 53132A triggering

For a low duty cycle pulse, the ac coupled signal will be approximately the same as if it were dc coupled. Not sure I follow what you mean. There will be only one rising edge for a narrow pulse ac coupled, as the falling edge occurs much quicker than the HPF time constant. On Friday, 16 September

Re: [time-nuts] 53132A triggering

- Original Message - From: "Charles Steinmetz" <csteinm...@yandex.com> To: <time-nuts@febo.com> Sent: Friday, September 16, 2016 5:46 PM Subject: Re: [time-nuts] 53132A triggering Bob wrote: Set it to: 1) DC coupled (AC does not go low enough) 2) 50 ohms

Re: [time-nuts] 53132A triggering

Bob wrote: Set it to: 1) DC coupled (AC does not go low enough) 2) 50 ohms if your driving source will tolerate it, otherwise 1 meg ohm. 3) Manual trigger mode (Auto is to fast and it forgets where the trigger should be) 4) Trigger level around 1/2 the PPS P-P voltage I would just add the

Re: [time-nuts] 53132A triggering

Hi Most PPS signals these days are very low duty cycle. If you AC couple them, you can easily be triggering on the wrong edge. With the narrow pulse it may not be very obvious. Bob > On Sep 16, 2016, at 5:46 PM, Charles Steinmetz wrote: > > Bob wrote: > >> Set it

Re: [time-nuts] 53132A triggering

The new ones don't? That would be annoying. My old Racal-Dana 1992 remembers when in standby mode but not if it loses power. On Fri, 16 Sep 2016 15:21:50 -0400, you wrote: >Thanks, Bob. I just tried that and got solid results. One nice thing about >the 5370 vs this newer stuff is that the

Re: [time-nuts] 53132A triggering

Thanks, Bob. I just tried that and got solid results. One nice thing about the 5370 vs this newer stuff is that the knobs and switches stay in the same place through power cycles! > On Sep 16, 2016, at 1:21 PM, Bob Camp wrote: > > Hi > > Set it to: > > 1) DC coupled (AC

Re: [time-nuts] 53132A triggering

Hi Set it to: 1) DC coupled (AC does not go low enough) 2) 50 ohms if your driving source will tolerate it, otherwise 1 meg ohm. 3) Manual trigger mode (Auto is to fast and it forgets where the trigger should be) 4) Trigger level around 1/2 the PPS P-P voltage Once set up that way, the

[time-nuts] 53132A triggering

I'm fairly new to driving the 53132 and it seems to be quite a pain to set up reliable triggering for TTL-level pulses (e.g., PPS). Simply leaving it to auto-trigger sure doesn't do the trick. Any suggestions on optimum trigger settings for this use? Thanks!