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quasi peak measurement

Question asked by mrstudy on Aug 11, 2010
Latest reply on Sep 10, 2010 by tabbott

We have a HP 8591EM series analyzer.

I get different results when I run a quasi peak scan vs. measure at marker and would like some help understanding the differences.

1) If I set up my span from 150KHz to 160KHz and have the following amplitude settings;
       REF LEVEL: 75dBuV
       ATTEN: AUTO
       SCALE: LOG
       LIN CHCK: OFF

I get a quasi peak scan that displays a result below the limit line.

2) If I use the measure at marker function I get a quasi peak value above the limit.

What am I do wrong?