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Tangential Sensitivity Measurement and Signal Correction in the Presence of High Ambients

Radiation measurements often require readings at or near the sensitivity limits of interference analyzers. A technique for determining the exact value of tangential sensitivity of an interference analyzer is described. It will be shown that the noise floor of an analyzer causes the meter to read higher than the signal being measured when the quasi­ peak detector is used. When the signal cannot be distinguished from the noise floor, that signal is at least 7dB below the reading. The tangential sensitivity can be improved lOdB or more through the use of external wide-band pre­ amplifiers. Mixed broadband and narrow band signals are examined and a technique is described which will permit the determination of the presence of emissions from a device under test, when it could not otherwise be distinguished from ambient. If the emission is narrow band, the level can very likely be measured even though it is lOdB or more below the ambient level.