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" To: 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 if your driving source

Re: [time-nuts] Why are PPS pulses so narrow? (was: 53132A triggering)

Hi It is sort of an " everybody does it " sort of thing. Various justifications: Less power is used / less heat in the drivers and terminations. Transformer coupling works better ( lower delay ) with narrow pulses Anything over 1 us has been "really long" in terms of

[time-nuts] Why are PPS pulses so narrow? (was: 53132A triggering)

I asked this very question a few years back... the consensus was to lower power dissipation into the typical 50 ohm load. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and

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

[time-nuts] Why are PPS pulses so narrow? (was: 53132A triggering)

Can I ask why PPS pulses are so narrow? It makes them difficult to see on a 'scope, and difficult to detect on a PC. And, as Bob said, far less obvious if you trigger off the wrong edge. Peter On 16 September 2016 at 23:55, Bob kb8tq wrote: > > Hi > > Most PPS signals

Re: [time-nuts] A new take on the all-hardware GPSDO concept

Hi Lars. I own a G3RUH (Miller) GPSDO. >From what I can recall While testing mine with my collection of >HP5370B's and my assortment of references the performance of mine while locked >was generally comparable to the one in the link you provided. I never tested >it "un locked." I

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

[time-nuts] HP-105B Manual

[I keep forgetting to send these messages in plain text only. Sorry!] Somewhere in one of these 105B discussions were some comments on the manual and its enormous set of change sheets. So I asked my wife, the former Laura Cline of HP Santa Clara marketing (post-sales support), "Why didn't you

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] HP-105B Battery Replacement?

I have a pair of Liebert GTX2-700RT online UPSes and they work well; I just replaced the batteries, lubricated the fans, and cleaned the dust out of them a couple weeks ago. They have that sort of standard 4 prong socket on the back for external batteries. But unlike my two Powerware Prestige

Re: [time-nuts] Lady Heather's plotting functions

Not just GPSDO's... now works with just about any GPS receiver, timing or otherwise (and with GPSD). Code is now pushing 60,000 lines. From: Scott Stobbe Sent: Friday, September 16, 2016 6:27 PM To: hol...@hotmail.com;

Re: [time-nuts] HP-105B Battery Replacement?

High end standby UPSes support external batteries but most or all online UPSes do. I have 3 different online UPS models and they all support external batteries of either 48 or 60 volts. On Thu, 15 Sep 2016 15:13:59 -0700, you wrote: >Since I have a 12V 100 A-H gelled electrolyte battery as a

Re: [time-nuts] A new take on the all-hardware GPSDO concept

Hi Nick, Jim Millers design is very clever and as I see can give results as good as a digital approach but it has the same limitations: The GPS jitter and the oscillator jitter in combination with the loop bandwidth. The only ADEV I have seen for the Miller GPSDO is this one

Re: [time-nuts] Jim Miller simple GPSDO

On 9/16/16 12:07 PM, Lars Walenius wrote: Interesting. Maybe not the optimum oscillator for a GPSDO. Lars Från: Tim Shoppa Skickat: den 14 september 2016 14:39 There are special "wide-pull-range" VCXO's where a 10MHz unit will indeed have sensitivity of 600Hz/V

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] Jim Miller simple GPSDO

Interesting. Maybe not the optimum oscillator for a GPSDO. Lars >Från: Tim Shoppa Skickat: den 14 september 2016 14:39 There are special "wide-pull-range" VCXO's where a 10MHz unit will indeed have sensitivity of 600Hz/V or more. e.g.

Re: [time-nuts] Lady Heather's plotting functions

The joys of a small display, why couldn't I see that. Many thanks Mark & Peter. Soon to be the emac's of gpsdo's (in the good, can do anything sense) well done. On Wed, Sep 14, 2016 at 12:27 AM, Mark Sims wrote: > You can set the view interval to any value with the "V"

Re: [time-nuts] HP-105B Battery Replacement?

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Re: [time-nuts] HP-105B Battery Replacement?

Hi David: The chemistries are very different. Ni-Cad is endothermic whereas Ni-MH is Exothermic. This is why chargers for Ni-MH have a mandatory temperature sensor. This is one of the reasons I say Ni-Cad cells batteries are easy to charge. -- Have Fun, Brooke Clarke http://www.PRC68.com

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

Re: [time-nuts] HP-105B Battery Replacement?

Hi Any time you get into UPS designs, they are all over the map … > On Sep 16, 2016, at 1:01 PM, Gary E. Miller wrote: > > Yo Hal! > > On Fri, 16 Sep 2016 00:50:56 -0700 > Hal Murray wrote: > >> g...@rellim.com said: >>> APC UPS can't handle 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!

Re: [time-nuts] HP-105B Battery Replacement?

Yo Hal! On Fri, 16 Sep 2016 00:50:56 -0700 Hal Murray wrote: > g...@rellim.com said: > > APC UPS can't handle the longer runtime, but never had a problem > > with any version of CyberPower. > > There are two parameters for UPS boxes. One is the power the >

[time-nuts] HP-105B Manual

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Re: [time-nuts] HP-105B Battery Replacement?

Actually the larger SmartUPS series can run for hours providing a large enough battery string is available I have a SmartUPS RM3000 running data rack this has 2 external battery boxes and will run everything for 6 hours. For TimeNuts applications though I'd recommend a Liebert UPS as this

Re: [time-nuts] HP-105B Battery Replacement?

g...@rellim.com said: > APC UPS can't handle the longer runtime, but never had a problem with any > version of CyberPower. There are two parameters for UPS boxes. One is the power the electronics can handle. The other is the amount of energy the batteries can hold. I think some of the

Re: [time-nuts] HP-105B Battery Replacement?

Thanks, everyone for the ideas and discussion. One sine wave inverter sold by theinverterstore.com is a " *AIMS 1200 Watt Inverter with Transfer SwitchPart # PWRIX120012S." * It sounds more than adequate for my needs. I'm sure there are others and I'll continue to shop. Jeremy On Thursday,