Thank You John, I have tried with different sweep speeds both above and below 100 us/div, the problem appears to be no output at all.   Best regards, Sal C. Cornacchia Electronic RF Microwave Engineer (Ret.) ________________________________ From: John Ackermann N8UR <jra@febo.com> To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Sun, February 7, 2010 8:45:06 PM Subject: Re: [time-nuts] No 1 PPS output on a Tbolt Sal, what sweep time are you using on the scope?  I believe the TBolt PPS is only microseconds wide, so you may need to speed up the sweep time to around 100us/div or faster to see it accurately.  And you may need to mess with delaying the sweep to get the pulse on the screen. John ---- SAL CORNACCHIA said the following on 02/07/2010 08:32 PM: > I cannot measure anything, with the scope set at max sensitivity, there is only a tiny dot indication every second. >  > Best regards, > > Sal C. Cornacchia > Electronic RF Microwave Engineer (Ret.) > > > > > > > ________________________________ > From: Bruce Griffiths <bruce.griffiths@xtra.co.nz> > To: Discussion of precise time and frequency measurement <time-nuts@febo.com> > Sent: Sun, February 7, 2010 7:45:26 PM > Subject: Re: [time-nuts] No 1 PPS output on a Tbolt > > Any idea what the pulse shapes you see is with a 1M load and with a 50 > ohm load? > > Bruce > > SAL CORNACCHIA wrote: >> Hi Didier, >>  >> When the 50 ohms termination is switch on the oscilloscope there is a tiny positive dot deflecting every second, it appears to have a very low output. >>  Best regards, >> Sal C. Cornacchia >> Electronic RF Microwave Engineer (Ret.) >> >> >> >> >> >> >> >> ________________________________ >> From: Didier Juges<didier@cox..net> >> To: Time-Nuts<time-nuts@febo.com> >> Sent: Sun, February 7, 2010 11:51:15 AM >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt >> >> The pulse is narrow, but it should be a full 5V amplitude. The driver is pretty beefy, the amplitude does dot drop appreciably when loaded with 50 ohms on mine. >> >> Didier KO4BB >> >> ------------------------ Sent from my BlackBerry Wireless thingy while I do other things... >> >> -----Original Message----- >> From: SAL CORNACCHIA<salccor@rogers.com> >> Date: Sun, 7 Feb 2010 08:42:49 >> To: Discussion of precise time and frequency measurement<time-nuts@febo.com> >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt >> >> Hi Bob, >> The pulse is barely visible on the Tektronix 485 it appears to be a very low output. >> Best regards, >> Sal C. Cornacchia >> Electronic RF Microwave Engineer (Ret.) >> >> >> >> >> >> >> >> ________________________________ >> From: Bob Camp<lists@cq.nu> >> To: Discussion of precise time and frequency measurement<time-nuts@febo..com> >> Sent: Sun, February 7, 2010 11:26:16 AM >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt >> >> Hi >> >> The 5345 should see it if it's set to 50 ohm termination and DC coupling.. A >> sweep of the trigger from about 1.5 to 3.5 volts should show it there over >> most of the sweep. >> >> Bob >> >> -------------------------------------------------- >> From: "SAL CORNACCHIA"<salccor@rogers.com> >> Sent: Sunday, February 07, 2010 11:06 AM >> To: "Discussion of precise time and frequency measurement" >> <time-nuts@febo..com> >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt >> >>    >>> Oscilloscope and 5345A Counter, the Tbolt software shows all green. >>>    Best regards, >>> Sal C. Cornacchia >>> Electronic RF Microwave Engineer (Ret.) >>> >>> >>> >>> >>> >>> >>> >>> ________________________________ >>> From: "Stan, W1LE"<stanw1le@verizon.net> >>> To: Discussion of precise time and frequency measurement >>> <time-nuts@febo.com> >>> Sent: Sun, February 7, 2010 10:47:42 AM >>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt >>> >>> Hello Sal, >>> >>> What are you monitoring the PPS output with ?? >>> >>> It is a short duration pulse. >>> >>> What does the TboltMON software (available at the trimble website) show ? >>> >>> What does Lady Heather indicate ? >>> (She is just waiting to massage your numbers.) >>> >>> Stan, W1LE >>> >>> >>> >>>      > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Try hooking the output to an LED. It's very difficult for me to see the pulse on my analog scopes but there is no arguing with the blinking light. -Bob On Mon, Feb 8, 2010 at 8:05 AM, SAL CORNACCHIA <salccor@rogers.com> wrote: > Thank You John, I have tried with different sweep speeds both above and > below 100 us/div, the problem appears to be no output at all. > > Best regards, > > Sal C. Cornacchia > Electronic RF Microwave Engineer (Ret.) > > > > > > > > ________________________________ > From: John Ackermann N8UR <jra@febo.com> > To: Discussion of precise time and frequency measurement < > time-nuts@febo.com> > Sent: Sun, February 7, 2010 8:45:06 PM > Subject: Re: [time-nuts] No 1 PPS output on a Tbolt > > Sal, what sweep time are you using on the scope? I believe the TBolt > PPS is only microseconds wide, so you may need to speed up the sweep > time to around 100us/div or faster to see it accurately. And you may > need to mess with delaying the sweep to get the pulse on the screen. > > John > ---- > > SAL CORNACCHIA said the following on 02/07/2010 08:32 PM: > > I cannot measure anything, with the scope set at max sensitivity, there > is only a tiny dot indication every second. > > > > Best regards, > > > > Sal C. Cornacchia > > Electronic RF Microwave Engineer (Ret.) > > > > > > > > > > > > > > ________________________________ > > From: Bruce Griffiths <bruce.griffiths@xtra.co.nz> > > To: Discussion of precise time and frequency measurement < > time-nuts@febo.com> > > Sent: Sun, February 7, 2010 7:45:26 PM > > Subject: Re: [time-nuts] No 1 PPS output on a Tbolt > > > > Any idea what the pulse shapes you see is with a 1M load and with a 50 > > ohm load? > > > > Bruce > > > > SAL CORNACCHIA wrote: > >> Hi Didier, > >> > >> When the 50 ohms termination is switch on the oscilloscope there is a > tiny positive dot deflecting every second, it appears to have a very low > output. > >> Best regards, > >> Sal C. Cornacchia > >> Electronic RF Microwave Engineer (Ret.) > >> > >> > >> > >> > >> > >> > >> > >> ________________________________ > >> From: Didier Juges<didier@cox..net> > >> To: Time-Nuts<time-nuts@febo.com> > >> Sent: Sun, February 7, 2010 11:51:15 AM > >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt > >> > >> The pulse is narrow, but it should be a full 5V amplitude. The driver is > pretty beefy, the amplitude does dot drop appreciably when loaded with 50 > ohms on mine. > >> > >> Didier KO4BB > >> > >> ------------------------ Sent from my BlackBerry Wireless thingy while I > do other things... > >> > >> -----Original Message----- > >> From: SAL CORNACCHIA<salccor@rogers.com> > >> Date: Sun, 7 Feb 2010 08:42:49 > >> To: Discussion of precise time and frequency measurement< > time-nuts@febo.com> > >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt > >> > >> Hi Bob, > >> The pulse is barely visible on the Tektronix 485 it appears to be a very > low output. > >> Best regards, > >> Sal C. Cornacchia > >> Electronic RF Microwave Engineer (Ret.) > >> > >> > >> > >> > >> > >> > >> > >> ________________________________ > >> From: Bob Camp<lists@cq.nu> > >> To: Discussion of precise time and frequency measurement<time-nuts@febo. > .com> > >> Sent: Sun, February 7, 2010 11:26:16 AM > >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt > >> > >> Hi > >> > >> The 5345 should see it if it's set to 50 ohm termination and DC > coupling.. A > >> sweep of the trigger from about 1.5 to 3.5 volts should show it there > over > >> most of the sweep. > >> > >> Bob > >> > >> -------------------------------------------------- > >> From: "SAL CORNACCHIA"<salccor@rogers.com> > >> Sent: Sunday, February 07, 2010 11:06 AM > >> To: "Discussion of precise time and frequency measurement" > >> <time-nuts@febo..com> > >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt > >> > >> > >>> Oscilloscope and 5345A Counter, the Tbolt software shows all green. > >>> Best regards, > >>> Sal C. Cornacchia > >>> Electronic RF Microwave Engineer (Ret.) > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> ________________________________ > >>> From: "Stan, W1LE"<stanw1le@verizon.net> > >>> To: Discussion of precise time and frequency measurement > >>> <time-nuts@febo.com> > >>> Sent: Sun, February 7, 2010 10:47:42 AM > >>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt > >>> > >>> Hello Sal, > >>> > >>> What are you monitoring the PPS output with ?? > >>> > >>> It is a short duration pulse. > >>> > >>> What does the TboltMON software (available at the trimble website) show > ? > >>> > >>> What does Lady Heather indicate ? > >>> (She is just waiting to massage your numbers.) > >>> > >>> Stan, W1LE > >>> > >>> > >>> > >>> > > > > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >

Thank You so much for all the great responses for the Tbolt 1 PPS measurements and suggestions how to measure the output of the 1 PPS, unfortunately I am not able to see any output at all, I will contact the seller and make arrangements for an exchange, he is away for about two weeks, I will wait and what he suggests to do. Thank You so much for all Your help, a great group of well informed peoples.   Best regards,   Sal C. Cornacchia Electronic RF Microwave Engineer (Ret.) ________________________________ From: Robert Darlington <rdarlington@gmail..com> To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Mon, February 8, 2010 10:15:32 AM Subject: Re: [time-nuts] No 1 PPS output on a Tbolt Try hooking the output to an LED.  It's very difficult for me to see the pulse on my analog scopes but there is no arguing with the blinking light. -Bob On Mon, Feb 8, 2010 at 8:05 AM, SAL CORNACCHIA <salccor@rogers.com> wrote: > Thank You John, I have tried with different sweep speeds both above and > below 100 us/div, the problem appears to be no output at all. > > Best regards, > > Sal C. Cornacchia > Electronic RF Microwave Engineer (Ret.) > > > > > > > > ________________________________ > From: John Ackermann N8UR <jra@febo.com> > To: Discussion of precise time and frequency measurement < > time-nuts@febo.com> > Sent: Sun, February 7, 2010 8:45:06 PM > Subject: Re: [time-nuts] No 1 PPS output on a Tbolt > > Sal, what sweep time are you using on the scope?  I believe the TBolt > PPS is only microseconds wide, so you may need to speed up the sweep > time to around 100us/div or faster to see it accurately.  And you may > need to mess with delaying the sweep to get the pulse on the screen. > > John > ---- > > SAL CORNACCHIA said the following on 02/07/2010 08:32 PM: > > I cannot measure anything, with the scope set at max sensitivity, there > is only a tiny dot indication every second. > > > > Best regards, > > > > Sal C. Cornacchia > > Electronic RF Microwave Engineer (Ret.) > > > > > > > > > > > > > > ________________________________ > > From: Bruce Griffiths <bruce.griffiths@xtra.co.nz> > > To: Discussion of precise time and frequency measurement < > time-nuts@febo.com> > > Sent: Sun, February 7, 2010 7:45:26 PM > > Subject: Re: [time-nuts] No 1 PPS output on a Tbolt > > > > Any idea what the pulse shapes you see is with a 1M load and with a 50 > > ohm load? > > > > Bruce > > > > SAL CORNACCHIA wrote: > >> Hi Didier, > >> > >> When the 50 ohms termination is switch on the oscilloscope there is a > tiny positive dot deflecting every second, it appears to have a very low > output. > >>  Best regards, > >> Sal C. Cornacchia > >> Electronic RF Microwave Engineer (Ret.) > >> > >> > >> > >> > >> > >> > >> > >> ________________________________ > >> From: Didier Juges<didier@cox..net> > >> To: Time-Nuts<time-nuts@febo.com> > >> Sent: Sun, February 7, 2010 11:51:15 AM > >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt > >> > >> The pulse is narrow, but it should be a full 5V amplitude. The driver is > pretty beefy, the amplitude does dot drop appreciably when loaded with 50 > ohms on mine. > >> > >> Didier KO4BB > >> > >> ------------------------ Sent from my BlackBerry Wireless thingy while I > do other things... > >> > >> -----Original Message----- > >> From: SAL CORNACCHIA<salccor@rogers.com> > >> Date: Sun, 7 Feb 2010 08:42:49 > >> To: Discussion of precise time and frequency measurement< > time-nuts@febo.com> > >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt > >> > >> Hi Bob, > >> The pulse is barely visible on the Tektronix 485 it appears to be a very > low output. > >> Best regards, > >> Sal C. Cornacchia > >> Electronic RF Microwave Engineer (Ret.) > >> > >> > >> > >> > >> > >> > >> > >> ________________________________ > >> From: Bob Camp<lists@cq.nu> > >> To: Discussion of precise time and frequency measurement<time-nuts@febo. > .com> > >> Sent: Sun, February 7, 2010 11:26:16 AM > >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt > >> > >> Hi > >> > >> The 5345 should see it if it's set to 50 ohm termination and DC > coupling.. A > >> sweep of the trigger from about 1.5 to 3.5 volts should show it there > over > >> most of the sweep. > >> > >> Bob > >> > >> -------------------------------------------------- > >> From: "SAL CORNACCHIA"<salccor@rogers.com> > >> Sent: Sunday, February 07, 2010 11:06 AM > >> To: "Discussion of precise time and frequency measurement" > >> <time-nuts@febo..com> > >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt > >> > >> > >>> Oscilloscope and 5345A Counter, the Tbolt software shows all green. > >>>    Best regards, > >>> Sal C. Cornacchia > >>> Electronic RF Microwave Engineer (Ret.) > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> ________________________________ > >>> From: "Stan, W1LE"<stanw1le@verizon.net> > >>> To: Discussion of precise time and frequency measurement > >>> <time-nuts@febo.com> > >>> Sent: Sun, February 7, 2010 10:47:42 AM > >>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt > >>> > >>> Hello Sal, > >>> > >>> What are you monitoring the PPS output with ?? > >>> > >>> It is a short duration pulse. > >>> > >>> What does the TboltMON software (available at the trimble website) show > ? > >>> > >>> What does Lady Heather indicate ? > >>> (She is just waiting to massage your numbers.) > >>> > >>> Stan, W1LE > >>> > >>> > >>> > >>> > > > > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

 I put a dual-colour (red-green) LED in a BNC plug for just this

 As others have said, I set the (analogue Tek 2445) 'scope to

 TTFN,

      Peter

Hi Robert, I put a dual-colour (red-green) LED in a BNC plug for just this sort of purpose. No series resistor - the 50-ohm source impedance limits the current nicely. With dual-colour, I can see both positive and negative pulses. 100ms pulses are perfect, 10ms OK, 1ms are very dim, but there is no chance of seeing the 10us pulses from the Thunderbolt. As others have said, I set the (analogue Tek 2445) 'scope to 10us/div, 2 volt/div, 50 ohms, DC positive edge trigger, and waggle the trigger level. The display is dim, but visible. A slightly slower scan would narrow and brighten the pulse on a tired tube. TTFN, Peter On 8 February 2010 15:15, Robert Darlington <rdarlington@gmail.com> wrote: > Try hooking the output to an LED.  It's very difficult for me to see the > pulse on my analog scopes but there is no arguing with the blinking light. > > -Bob

 I put a dual-colour (red-green) LED in a BNC plug for just this

 As others have said, I set the (analogue Tek 2445) 'scope to

 TTFN,

      Peter

Hi Of course the other option is to *finally* break down and buy a digital scope. They've been out there for > 20 years now. Yes, I did indeed cross over to the dark side last week.... Bob On Feb 12, 2010, at 7:24 AM, Peter Vince wrote: > Hi Robert, > > I put a dual-colour (red-green) LED in a BNC plug for just this > sort of purpose. No series resistor - the 50-ohm source impedance > limits the current nicely. With dual-colour, I can see both positive > and negative pulses. 100ms pulses are perfect, 10ms OK, 1ms are very > dim, but there is no chance of seeing the 10us pulses from the > Thunderbolt. > > As others have said, I set the (analogue Tek 2445) 'scope to > 10us/div, 2 volt/div, 50 ohms, DC positive edge trigger, and waggle > the trigger level. The display is dim, but visible. A slightly > slower scan would narrow and brighten the pulse on a tired tube. > > TTFN, > > Peter > > > On 8 February 2010 15:15, Robert Darlington <rdarlington@gmail.com> wrote: >> Try hooking the output to an LED. It's very difficult for me to see the >> pulse on my analog scopes but there is no arguing with the blinking light. >> >> -Bob > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >

  I put a dual-colour (red-green) LED in a BNC plug for just this

  As others have said, I set the (analogue Tek 2445) 'scope to

  TTFN,

       Peter

Hi Bob: I have been studying digital scopes for some time and have the Rigol DS1052E on the way. http://www.prc68.com/I/RigolDS1052E.shtml Rigol may make the low end scopes that are sold by Agilent. This model goes for a little over $400 and gets excellent reviews (links on the above web page). Have Fun, Brooke Clarke http://www.PRC68.com Bob Camp wrote: > Hi > > Of course the other option is to *finally* break down and buy a digital scope. They've been out there for> 20 years now. > > Yes, I did indeed cross over to the dark side last week.... > > Bob > > On Feb 12, 2010, at 7:24 AM, Peter Vince wrote: > > >> Hi Robert, >> >> I put a dual-colour (red-green) LED in a BNC plug for just this >> sort of purpose. No series resistor - the 50-ohm source impedance >> limits the current nicely. With dual-colour, I can see both positive >> and negative pulses. 100ms pulses are perfect, 10ms OK, 1ms are very >> dim, but there is no chance of seeing the 10us pulses from the >> Thunderbolt. >> >> As others have said, I set the (analogue Tek 2445) 'scope to >> 10us/div, 2 volt/div, 50 ohms, DC positive edge trigger, and waggle >> the trigger level. The display is dim, but visible. A slightly >> slower scan would narrow and brighten the pulse on a tired tube. >> >> TTFN, >> >> Peter >> >> >> On 8 February 2010 15:15, Robert Darlington<rdarlington@gmail.com> wrote: >> >>> Try hooking the output to an LED. It's very difficult for me to see the >>> pulse on my analog scopes but there is no arguing with the blinking light. >>> >>> -Bob >>> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > >

 I put a dual-colour (red-green) LED in a BNC plug for just this

 As others have said, I set the (analogue Tek 2445) 'scope to

 TTFN,

      Peter

I'm using a very bright blue LED and series resistor on the PPS output of my thunderbolt and it's quite visible. It's not bright by any means, but it is distracting to see out of the corner of my eye in the rack some days. I like the dual color LED idea and think I'll make a similar connector for this type of thing. Thanks. -Bob On Fri, Feb 12, 2010 at 5:24 AM, Peter Vince <pvince@theiet.org> wrote: > Hi Robert, > > I put a dual-colour (red-green) LED in a BNC plug for just this > sort of purpose. No series resistor - the 50-ohm source impedance > limits the current nicely. With dual-colour, I can see both positive > and negative pulses. 100ms pulses are perfect, 10ms OK, 1ms are very > dim, but there is no chance of seeing the 10us pulses from the > Thunderbolt. > > As others have said, I set the (analogue Tek 2445) 'scope to > 10us/div, 2 volt/div, 50 ohms, DC positive edge trigger, and waggle > the trigger level. The display is dim, but visible. A slightly > slower scan would narrow and brighten the pulse on a tired tube. > > TTFN, > > Peter > > > On 8 February 2010 15:15, Robert Darlington <rdarlington@gmail.com> wrote: > > Try hooking the output to an LED. It's very difficult for me to see the > > pulse on my analog scopes but there is no arguing with the blinking > light. > > > > -Bob > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >

I got a DS1052E a few months ago and I'm quite happy with it. It's great for looking at events like this thread has been discussing (although am I the only person who still owns a Radio Shack logic probe from the 70's which would work just fine for detecting 1PPS??). I won't be giving up my three analog Tek scopes anytime soon though. The DS1052E tends to be a bit noisy looking at low level signals, and anything over 50Mhzish pushes me back to the analogs. The user interface isn't always obvious, as it seems most buttons have multiple function and menus abound on this thing. But user interface problems seem to be common on lots of test equipment these days -- I wonder what kind of scope Steve Jobs would design :-) I find myself using it mostly as a kind of 2 channel analog logic analyzer, setting up a single capture from the trigger and studying what happened before and after the trigger. First use was looking at an I2C bus, not only to look at the data, but also the rise time of the signals. For the price it can't be beat, and it fills a diagnostic hole for me that I can't easily fill with the other equipment at my (hobbyist) disposal. Scott Brooke Clarke wrote: > Hi Bob: > > I have been studying digital scopes for some time and have the Rigol > DS1052E on the way. > http://www.prc68.com/I/RigolDS1052E.shtml > Rigol may make the low end scopes that are sold by Agilent. This > model goes for a little over $400 and gets excellent reviews (links on > the above web page). > > Have Fun, > > Brooke Clarke > http://www.PRC68.com > >

I use both a DS1052E and a couple of Tek scopes. I do like the DS1052E and think it offers great value at 25% the price of a comparable Tek. I love the long memory. The Teks still feel more solid (in an accuracy/reliability/usability sense). I noticed some trigger jitter on the DS1052E. Henry On Fri, Feb 12, 2010 at 9:14 AM, Scott Burris <slburris@gmail.com> wrote: > I got a DS1052E a few months ago and I'm quite happy with it.  It's great > for looking at events > like this thread has been discussing (although am I the only person who > still owns a Radio Shack > logic probe from the 70's which would work just fine for detecting 1PPS??). > > I won't be giving up my three analog Tek scopes anytime soon though.  The > DS1052E > tends to be a bit noisy looking at low level signals, and anything over > 50Mhzish pushes > me back to the analogs.  The user interface isn't always obvious, as it > seems most buttons > have multiple function and menus abound on this thing.  But user interface > problems seem to > be common on lots of test equipment these days -- I wonder what kind of > scope Steve Jobs > would design :-) > > I find myself using it mostly as a kind of 2 channel analog logic analyzer, > setting up a single > capture from the trigger and studying what happened before and after the > trigger.  First use > was looking at an I2C bus, not only to look at the data, but also the rise > time of the signals. > > For the price it can't be beat, and it fills a diagnostic hole for me that I > can't easily fill with > the other equipment at my (hobbyist) disposal. > > Scott > > Brooke Clarke wrote: >> >> Hi Bob: >> >> I have been studying digital scopes for some time and have the Rigol >> DS1052E on the way. >> http://www.prc68.com/I/RigolDS1052E.shtml >> Rigol may make the low end scopes that are sold by Agilent.  This model >> goes for a little over $400 and gets excellent reviews (links on the above >> web page). >> >> Have Fun, >> >> Brooke Clarke >> http://www.PRC68.com >> >> > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- Henry Hallam Sent from my Laptop

 I put a dual-colour (red-green) LED in a BNC plug for just this

 As others have said, I set the (analogue Tek 2445) 'scope to

 TTFN,

      Peter

Hi I went with a used Tek TDS-380. I still live in a fantasy world where it's not a scope if it doesn't say Tek on it :).... For a 15 year old scope the one I found seems to have pretty good performance. I've used them enough at work that I knew anything much under 300 MHz and 2 GS/s would drive me nuts. I must admit that my poor aching back put in a vote for one of the cute little LCD based scopes. Combining the LCD with the samples and bandwidth simply was way outside the budget. The debate went on for a month though ..... So far no complaints, but I'm not dumping any of the analog scopes quite yet. Bob On Feb 12, 2010, at 11:46 AM, Brooke Clarke wrote: > Hi Bob: > > I have been studying digital scopes for some time and have the Rigol DS1052E on the way. > http://www.prc68.com/I/RigolDS1052E.shtml > Rigol may make the low end scopes that are sold by Agilent. This model goes for a little over $400 and gets excellent reviews (links on the above web page). > > Have Fun, > > Brooke Clarke > http://www.PRC68.com > > > Bob Camp wrote: >> Hi >> >> Of course the other option is to *finally* break down and buy a digital scope. They've been out there for> 20 years now. >> >> Yes, I did indeed cross over to the dark side last week.... >> >> Bob >> >> On Feb 12, 2010, at 7:24 AM, Peter Vince wrote: >> >> >>> Hi Robert, >>> >>> I put a dual-colour (red-green) LED in a BNC plug for just this >>> sort of purpose. No series resistor - the 50-ohm source impedance >>> limits the current nicely. With dual-colour, I can see both positive >>> and negative pulses. 100ms pulses are perfect, 10ms OK, 1ms are very >>> dim, but there is no chance of seeing the 10us pulses from the >>> Thunderbolt. >>> >>> As others have said, I set the (analogue Tek 2445) 'scope to >>> 10us/div, 2 volt/div, 50 ohms, DC positive edge trigger, and waggle >>> the trigger level. The display is dim, but visible. A slightly >>> slower scan would narrow and brighten the pulse on a tired tube. >>> >>> TTFN, >>> >>> Peter >>> >>> >>> On 8 February 2010 15:15, Robert Darlington<rdarlington@gmail.com> wrote: >>> >>>> Try hooking the output to an LED. It's very difficult for me to see the >>>> pulse on my analog scopes but there is no arguing with the blinking light. >>>> >>>> -Bob >>>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >