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Why does my signal go off the top of the screen when I select either the Quasi-Peak or EMI Average detectors in my EMC or ESA analyzer?

A problem where the EMI Detector Auto-Ranging operation results in an incorrect setting of the reference level; yielding signals that are significantly above the top graticule and beyond the measurement range of the instrument has been found. The Auto-Ranging operation is automatically invoked when either the Quasi-Peak or EMI Average detectors are selected.

This can only be seen with signal levels greater than approx. 45dBuV that are four divisions or more from the top graticule on-screen before selecting the EMI detector.

This can also affect the results of both the "Measure at Marker" and "Auto Measure" functions, as they both use this Auto-Ranging function.

A new firmware version has been released that corrects this problem. If you do not have firmware version A.14.01 or later there are links below that will take you to either the EMC or ESA firmware download site where the correct new version for your particular analyzer can be downloaded free of charge.

Documents & Downloads

EMC Spectrum Analyzer Firmware 
Download firmware for your EMC spectrum analyzer.
Previous Versions

Instrument Firmware/Software Current Version: A.14.06 | 2008-09-01

ESA Spectrum Analyzer Firmware 
Firmware for your ESA Spectrum Analyzer available for download.
Previous Versions

Instrument Firmware/Software Current Version: A.14.06 | 2008-09-01