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Modulation uncertainty calculation

Question asked by ruebenn on Apr 8, 2008
Latest reply on Oct 18, 2011 by Ludogratz

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Dear Sir/Ms,

I am sorry to bug you once again but i would be obliged if you could help me out on some aspects of the generator uncertainty.

I have sought help on the power and time/frequency uncertainty calculation and i sincerely appreciate the people in this forum for that.

But i do require some extra help on the uncertainty calculation involving phase/amplitude/frequency modulation.

Do you have any readouts or details as of how these steps are tabulated and calculated?

Say, if i use the 8902S to calibrate the 8648D signal generator's frequency/amplitude/phase modulation - how do i arrive at the uncertainties associated with it?

When i see the 8902S specs, it is stated something like 3% + reading??
I have a tought time comprehending it..

Appreciate the help.

Rgds
Ruben

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jborges3 May 22, 2008 4:11 PM

Hi Ruben,

Take a look at section 3.4 in the following document

http://cp.literature.agilent.com/litweb ... 2151EN.pdf

Section 3.4 is on error analysis for analog demodulation.

I hope this helps,

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RobertS Nov 22, 2010 12:17 PM

Hello Ruben:
I am Retired from Agilent and have done many measurement uncertainty calculations.
To answer your question there are several details that are necessary. (1). Are you following the ISO method of measurement uncertainty calculation as indicated in the Guide to the Expression of Uncertainty in Measurement [referred to as the GUM]? This is the method all laboratories must follow today. (2). You must have a procedure that is used to do the test. Using this procedure you must ... (3). Write a measurement equation. The measurement equation is a mathematical equation that represents the exact test being performed. It includes all of the uncertainty terms of the standards used in the specific test process. It is impossible for anyone to answer your question without knowing this test process and the standards used to do the test. (4). When your standards are calibrated you must have the uncertainty of the standards available and their associated coverage factors. (5). The GUM requires the specifications used in the calculation be considered Rectangular unless you know the how many sigma the specification is.
If you provide me with a copy of the test process used, I will help to guide you through writing the measurement equation.
Sincerely,
Robert S.

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Ludogratz Oct 18, 2011 4:42 AM

Thanks for the help and link. I managed to get it right on point.

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jborges3 May 22, 2008 4:11 PM
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Hi Ruben,

Take a look at section 3.4 in the following document

http://cp.literature.agilent.com/litweb ... 2151EN.pdf

Section 3.4 is on error analysis for analog demodulation.

I hope this helps,
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RobertS Nov 22, 2010 12:17 PM
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Hello Ruben:
I am Retired from Agilent and have done many measurement uncertainty calculations.
To answer your question there are several details that are necessary. (1). Are you following the ISO method of measurement uncertainty calculation as indicated in the Guide to the Expression of Uncertainty in Measurement [referred to as the GUM]? This is the method all laboratories must follow today. (2). You must have a procedure that is used to do the test. Using this procedure you must ... (3). Write a measurement equation. The measurement equation is a mathematical equation that represents the exact test being performed. It includes all of the uncertainty terms of the standards used in the specific test process. It is impossible for anyone to answer your question without knowing this test process and the standards used to do the test. (4). When your standards are calibrated you must have the uncertainty of the standards available and their associated coverage factors. (5). The GUM requires the specifications used in the calculation be considered Rectangular unless you know the how many sigma the specification is.
If you provide me with a copy of the test process used, I will help to guide you through writing the measurement equation.
Sincerely,
Robert S.
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Ludogratz Oct 18, 2011 4:42 AM
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Thanks for the help and link. I managed to get it right on point.
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Modulation uncertainty calculation

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