A lot of zeros

Go To Last Post
5 posts / 0 new
Author
Message
#1
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0


I bought this two channel sig gen a while back for roughly $200.  I think its funny how it shows so many digits...you can enter 123.48675097328 KHz.

Unfortunately, it uses a (pretty good) crystal osc, so its only accurate to maybe 3ppm.  Someone might mistakenly use it & think they are getting all of those other digits.

Someday, I might hook in a Rubidium osc, (have a few somewhere), but would need to figure out where to tap in.

 

 

 

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

If I'm counting my zeroes correctly, they're claiming a resolution of 10 nano Hertz.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0


Maybe they are using a 48 or 64 bit DDS & just spitting out the "numbers"

I can't find any service info/schematics etc....time for a screwdriver.

 

It seems like this is a scheme by these import generators to fool the unwary--I've run into techs who'd probably claim that they were down in the nano Hz (oh, by the way we are also off by 2Hz)

Bet no could ever see the difference---it's all false specmanship.

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

Last Edited: Thu. Jun 20, 2019 - 05:22 AM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 1

I once saw a lovely cartoon (I'd link to it if I could find it again) that showed an archer who had put a half-dozen arrows into exactly the same spot - way out on the rim of the target. 

 

The caption was "Precision is not Accuracy".  S.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Scroungre wrote:

I once saw a lovely cartoon (I'd link to it if I could find it again) that showed an archer who had put a half-dozen arrows into exactly the same spot - way out on the rim of the target. 

 

The caption was "Precision is not Accuracy".  S.

For fun I searched on "Precision is not Accuracy" and found an entire universe of images of targets and arrows (or bullet holes).  Seems to be the illustration of choice for the concept.