The Trident Limit Analyzer feature is designed to support end of line product test and other Pass/Fail type measurement applications. The Limit Analyzer uses the Reference Spectrum feature and adds a prominent Pass/Fail indicator for Upper Limit (product noise emission) or Lower Limit (alarms) detection. Limits may be set based on an Awtd sound level, or 1/N octave band levels, or both. Since Trident supports measurement bandwidths as narrow as 1/24 octave band, the limit analyzer can easily be used for detecting and the magnitude of tonal energy.