Hi Bob,
On 01/18/2015 04:25 AM, Bob Camp wrote:
Hi
I’m a little concerned about the measurement setup here. Based on the quoted
text, there have been a few messages in the thread that have not showed up here.
The messages got accidentally posted in the wrong thread.
=========
The “start” input on the counter is defined below. The “stop” input is not
defined. Is the counter running in time interval mode or in frequency mode?
IF it’s in time mode - what is the stop hooked to?
IF it’s in frequent mode - what is the gate time set to ?
Is the “standard input” the missing front panel input or is it the external
reference input on the back panel?
I was also considering the setup strange in this regard. Common switched in?
=========
I’m looking at the data on the link:
http://www.ptp-images.com/affiche-directement-l-image-kccsz71c9a.html
In both cases the slope is roughly 1/tau. Both plots end up in the 3 to 4 x
10^-13 range at 100 to 300 seconds. That’s suspiciously good performance for a
rubidium or a GPSDO. Which is what makes me wonder about the setup.
The Blue plot (1 pps?) ran for 18 minutes and has 1,114 points in it. The Pink
plot ran for about 9 minutes and has a bit over 500 points in it. Both seem
reasonable for a 1 pps to 10 MHz sort of setup. That may explain part of my
confusion above.
Again - I apologize if this all got explained in a post that went missing here.
Not really. The plots looks to me like measurement setup baseline plots,
with some sine noise in them.
Cheers,
Magnus
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