#1315

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IMSAI Guy

Жыл бұрын

Episode 1315
Agilent is the big winner
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Пікірлер: 26

@gerrywoody4301 Жыл бұрын

Hi mr imsai putting ones rubidium up the rear came as a surprise on a sunday

@tonyfremont Жыл бұрын

The Agilent counter with the rubidium reference is awesome at (.0001Hz) resolution.

@joepalovick1915 Жыл бұрын

Great video. The slight difference in counts could also be that the clocks are likely slightly out of phase. .007Hz is nothing to complain about. 😂

@RyanUptonInnovator Жыл бұрын

Great video, makes me want a frequency counter.

@citizenrich Жыл бұрын

It won't be accurate to 15 digits even if could display them. There's loads of stuff about the accuracy of frequency counters on the time-nuts mailing list. Have a look, the time lords go deep into this very fun stuff.

@PapasDino Жыл бұрын

I'm going to swap out the fan in my 53131 as you did but will still continue to keep it on a switched AC power strip since I'm not depending on the internal clock but the Rb standard instead.

@ivolol Жыл бұрын

Over a longer timer scale, the GPS is more accurate, it's phase locking onto signal from many atomic clocks.

@rogergreenwood1536 Жыл бұрын

If all else fails, read the manual ;-)

@robinbrowne5419 Жыл бұрын

Yup. Reading the manual is like looking at the map. We only do it when we're lost :-)

@byronwatkins2565 Жыл бұрын

Another way to get more digits is to supply higher frequencies. Try a PLL with the 10 MHz base.

@bobdoritique7347 Жыл бұрын

Merci Guy.

@rubendutoit586 Жыл бұрын

2:17 2:17 2:17 2:17 2:17 😮s 2:17 se 2:17 s

@rubendutoit586 Жыл бұрын

2:17 2:17 eee

@rubendutoit586 Жыл бұрын

😮 2:17 2:17 2:17 2:17 eese 2:17 ß 2:27 2:27

@matteo234321 Жыл бұрын

I have a GPSDO but no rubidium or cesium standard. For that reason I'd be very curious how they compare. I suspect the GPSDO would have better phase noise, while the rubidium has lower drift. Is this true? I'd be very interested to see how the two look together on a scope!

@ZenwizardStudios Жыл бұрын

I have done some testing on this. GPSDO’s have an inherent issue where they get yanked around by the self-correcting nature of the clock. The MOST stable is a GPSDO feeding a 1pps in to a rubidium unit. The RB units have a better phase noise and “short term” accuracy and stability while the GPSDO’s have a much better long term stability but a worse short term stability due to self-correcting nature of the GPS lock. With a LONG integration time 48 hours for the RB unit the GPSDO can steer the RB but not yank it around. HOWEVER this is really getting down in to the weeds as I have found a standard Deviation of 115 uHz on 10 Mhz with a GPSDO only. And with the GPSDO coupled rubidium this dropped to 27uHz on the same 10Mhz carrier. So as long as frequencies of interest stay under a few Ghz both are REALLY down in the noise. The analysis was done on a 53131A with a new RB unit from Stanford Research, and a Samsung GPSDO module.

@matteo234321 Жыл бұрын

@Zenwizard Studios Very interesting. Thanks for the detailed response! I'll have to conjure a way to capture and identify the infrequent minor phase shift that would inevitably occur. I would be curious to see how often there's an adjustment. Though I could also likely look into the software I use to monitor it, it may report these adjustments