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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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FM/PM/AM accuracy - RF Cafe Forums

RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2010, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. Regardless, there are still lots of great posts in the archive that ware worth looking at. Below are the old forum threads, including responses to the original posts.

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Ruebenn
 Post subject: FM/PM/AM accuracy
Posted: Tue Sep 21, 2010 4:16 am 
 
Lieutenant

Joined: Fri Nov 20, 2009 3:11 am

Posts: 1

:smt102 Dear distinguished guests of the forum,

With reference to the 8902A specifications especially the FM/PM and AM accuracy published in the document , i would be obliged if anyone here can point out the differences in the said specs compared to the ones published by some accredited calibration labs using the same instruments.

For an example , the Freq Modulation accuracy(as stated in the 8902A spec sheet) is given as +2% of reading + 1 digit at freqs ranges 250kHz - 10MHz at rates 20 Hz -10kHz at deviation less than 40kHz peak.

But Agilent in its scope states it at 0.024FM +10Hz peak?

But using the same instruments , the accuracy should be 2% + 1 digit ,agreed?

Can i rewrite the accuracy as 0.02FM + 10 Hz peak?

How about Amplitude Modulation accuracy then?

The 8902A specs state +2% of reading + 1 digit at freq range 150kHz -10MHz at rates 50Hz - 10kHz and depths 5%-99% but again Agilent scope states it at 0.025 AM + 0.14 %......

Should it not be 0.02AM + 0.1% only?

I hope someone can help explain this difference?

Rgds

Ruben


 
   
 
VSWR
 Post subject: Re: FM/PM/AM accuracy
Posted: Wed Sep 22, 2010 9:17 am 
 
Captain

Joined: Sun Jan 11, 2004 4:44 pm

Posts: 18

I've seen the difference in semantics on a lot of certificates from cal labs. Pick a cal lab from a Google Search and call them to ask. You might even try calling Agilent and asking them. Agilent soaks you for products, but is usually pretty good about getting answers.

Posted  11/12/2012

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