×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Network analyser calibration

Network analyser calibration

Network analyser calibration

(OP)
Hi

I am attempting verification of the calibration standards that I am using on an old Rohde and Schwarz ZVRE network analyser.
The plan is to measure my standards on a new system calibrated with new standards and an accurate Cal Kit that I will have access to for a day. Then using these measurements I want to adjust my Cal Kit so that calibration with my standards are more accurate.

How do I relate the measured S-parameters to the values that I need to adjust in my Cal Kit saved on the VNA like Open parasitic capacitance and Short parasitic inductance and Load impedance?

Any help appreciated.
 

RE: Network analyser calibration

I've borrowed the same cal kit from a neighboring company, calibrated with theirs, then checked mine against theirs for comparison. You could do the same.

Cal kit data is a simple approximation with a few simple number using offset length and a capacitance. Agilent stores this simple info in firmware and when you specify which cal kit, it looks up these values for the short and open.

Measured Data points on loads, shorts and opens aren't usually stored in an analyzer to be used later. Hence the use of a "Verification Kit" to just make sure the shorts and opens look ok. Proving enhanced accuracy by measuring your cal kit needs the other machine to be proven super accurate. What if it just passes with the verification kit?

Suggest you consult with Rhode on your gameplan too.
Good luck.
 

RE: Network analyser calibration

That would work only if you have access to the actual data on the borrowed cal kit.  When you pick a "short circuit" out of a cal kit, it does not necessarily have p=1 with angle -180.0000 degrees!  It will have some loss, and more importantly have an phase angle that is off a little.

www.MaguffinMicrowave.com

Maguffin Microwave wireless design consulting

RE: Network analyser calibration

(OP)
How could I determine the loss and phase angle with reasonable accuracy? If I could measure these losses and offsets then setting up the characteristics of my standards should be easy and lead to improved calibration right?
I'm new to VNA calibration and measurements
 

RE: Network analyser calibration

Those are parameters that are stored in the network analyzer they are married to, albeit in weird form sometimes (like capacitance and delay).  On my analyzer I can go into the cal settings and read them off.  

You could calibrate you friend's an analyzer, measure the unknown cal set for magnitude and angle, and then you would know what they should look like on your analyzer.   

www.MaguffinMicrowave.com

Maguffin Microwave wireless design consulting

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


Resources

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