Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

irig-b resolution

irig-b resolution

irig-b resolution


I read that irig-b resolution is 10 ms but actual timecode generators usually have a resolution better than 1 µs.

I'm looking for some elaboration on this since I do not understand. Does the 10 ms resolution mean that the actual time provided by irig-b error could be up to 10 ms off from actual time? If so, would the 1 µs resolution apply in addition the to existing error?

Also, I'm not sure if this is the best place to ask but I thought I would throw it in since there is not a lot of information on the web on irig-b. If anyone has a recommendation for a low-cost irig-b signal generator, please let me know. I am not concerned with the actual time value being correct but I would like to have an irig-b signal on a coax line to work with. I've been watching generators on ebay but am hoping to find something in the sub-$100 price range.


RE: irig-b resolution

Yeah, saw that spec, if it answers my question I didn't catch it.

I didn't actually have the question until I was a bit further down the list. Hit #36 for "irig-b resolution" Google search was one of your posts here from 2002, IRstuff. I'm hoping you can help me with my confusion...

If IRIG-B resolution is 10 ms, and a timecode generator resolution is 1 ns, does that mean that each pulse will be +/- 1 ns after the previous pulse but the timecode data on each individual pulse may be +/- 10 ms due to the IRIG-B resolution itself?

RE: irig-b resolution

"Does the 10 ms resolution mean... ...up to 10 ms off from actual time?"

First thing is to distinguish between resolution and accuracy. A time signal can be low resolution yet extremely accurate. For example a simple 1 pps pulse train only identifies time to the nearest second resolution (referencing absolute time using other more informative references), but often does so to extremely high accuracy (perhaps within a us).

For the code resolution, start with Wiki (but check it against better references). It states "...Typical commercial devices will synchronize to within 1 microsecond using IRIG B timecodes."

Once the client (slave) device has synchronized, it can itself break up absolute time into finer units. Just like setting your watch to the dropping ball in Greenwich.

RE: irig-b resolution

Thanks for pointing out my misunderstanding VE1BLL.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close