Products > Test Equipment
1104x-e and 10mhz
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bobberCHOP:
So I hooked up a Leo Bodnar gpsdo oscillator to my scope, and the scope is reading 9.99997 MHz. It's all been running since yesterday just the counter doesn't reflect that as I accidentally cut the power, it's all good and warmed up though. Sending a signal to my 5335aHP shows a different story, infact, I'm happy with less than 1hz deviation 10. 000. 000. 53  If I run the gpsdo at 11MHz, it shows dead on from both units???
When I send a 10MHz signal from the 5335 back to the scope, I get the same result 9.99997MHz.

So what's the deal, is my 1-2 month old scope defunct? The gpsdo is brand new, and the counter just came back from calibration.

BillyO:
The stated accuracy of the internal timebase of the SDS1104X-E is +/- 25 ppm. 

You are measuring a 10MHz signal.  That means anything from 9.999750MHz to 10.000250MHz would be within spec.

Your reading is only out 30Hz.  I'd say that's pretty good. :-+
bobberCHOP:

--- Quote from: BillyO on February 10, 2023, 06:15:45 pm ---The stated accuracy of the internal timebase of the SDS1104X-E is +/- 25 ppm. 

You are measuring a 10MHz signal.  That means anything from 9.999750MHz to 10.000250MHz would be within spec.

Your reading is only out 30Hz.  I'd say that's pretty good. :-+

--- End quote ---
Thank you for the reply :-+ I guess I had never takin this into consideration. Is there any way adjusting the the displayed freq. through the menu?
tautech:

--- Quote from: bobberCHOP on February 10, 2023, 06:56:23 pm ---
--- Quote from: BillyO on February 10, 2023, 06:15:45 pm ---The stated accuracy of the internal timebase of the SDS1104X-E is +/- 25 ppm. 

You are measuring a 10MHz signal.  That means anything from 9.999750MHz to 10.000250MHz would be within spec.

Your reading is only out 30Hz.  I'd say that's pretty good. :-+

--- End quote ---
Thank you for the reply :-+ I guess I had never takin this into consideration. Is there any way adjusting the the displayed freq. through the menu?

--- End quote ---
No.
The system clock is not adjustable and on these entry level DSO's there is no 10 MHz reference input to correct such.
Please for the good of the forum learn how to take the small PNG screenshots with the blue Print button and upload a 80kB file instead of a 3MB monster.
Another point please, MegaHz is abbreviated as MHz and in an engineering forum we should take some care to get these things correct so not to have any change of being misinterpreted.

Great scope bobberCHOP and you'll have lots of fun learning its full capabilities.  :-+
BillyO:
If you really wanted it to show it smack on to someone. you could take a screen shot as tautech suggested (insert USB mem-stick, press  blue button)  then edit it with photoshop or some such.  :-//
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