Power Meter 50 MHz Reference Calibration & Verification

For calibrating RF sources such as 50MHz reference outputs, signal generators, etc.
csperrazza

Power Meter 50 MHz Reference Calibration & Verification

Performance Testing and Calibration of a Power Meter’s 50 MHz Reference

NOTE: This example is based on the Agilent E4418B/E4419B Power Meter. All procedures are modified from Agilent Technologies Part # E4418-90059 Revision G, April 23 2010.

rdragons
Posts: 2
Joined: Tue May 01, 2012 10:49 pm
Real Name: Richard Olson

Re: Power Meter 50 MHz Reference Calibration & Verification

A member of our Metrology department asked me to set these equations up in excel for them.
I can't get equation at line 16 to work with the values provided in the Worked Example of Output SWR values. Another website said I could download an already prepared excel spreadsheet from this forum, but I don't see it.
Does anyone have an excel spreadsheet that does this calculation?

abrush1
Posts: 57
Joined: Fri Feb 29, 2008 2:13 pm
Real Name: Andy Brush

Re: Power Meter 50 MHz Reference Calibration & Verification

I ran through the math myself and found a typo in the equation. The last subscript on Rho under the radical in the numerator should be "100", not "200". As soon as we can get it fixed, we'll post a correction to our Application Note 219.

The attached Excel Spreadsheet develops the equation correctly, and seems to give the same answers Charlie presented (He also used a spreadsheet, in which he got the equation right, but in a slightly different form.)
You do not have the required permissions to view the files attached to this post.

rdragons
Posts: 2
Joined: Tue May 01, 2012 10:49 pm
Real Name: Richard Olson

Re: Power Meter 50 MHz Reference Calibration & Verification

Thanks. I found the same error about the same time.

On the web there are two documents with the worked example values in disagreement.

http://www.tegam.com/PDF_Files/Resource ... 0Po.pdf
Calculate Output voltage reflective coefficient(+) 0.02902246
Calculate Output voltage reflective coefficient(-) 12.04147077

http://www.tegam.com/PDF_Files/Applicat ... 219.pdf
Calculate Output voltage reflective coefficient(+) 0.01451123
Calculate Output voltage reflective coefficient(-) 6.020735385

So you can also address the incorrect one in PDF_Files Resources when you fix AN219.

Thanks again.

csperrazza

Re: Power Meter 50 MHz Reference Calibration & Verification

There have been corrections made to the calculation of application note 219. Attached is the application note and the excel spreadsheet for the calculations.
You do not have the required permissions to view the files attached to this post.