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Automated Test Sequences 109
5. Amplitude used to measure the full-on gain curve
6. Reference frequency
7. Leveling status
8. OSPL90 HFA: High frequency average of the OSPL90 curve
9. OSPL90 MAX: Maximum output of the OSPL90 curve and the frequency at
which it was measured
10. FOG: Reference frequency response made at full-on gain
11. HFA: High frequency average made at full-on gain
12. CALC: Calculated reference test gain
13. Equivalent input noise
14. LIM: Response limit
F1: Frequency at which the response curve first crosses the response limit.
F2: Frequency at which the response curve last crosses the response limit.
15. Total harmonic distortion
16. DF DIST: Difference frequency distortion, also known as intermodulation
distortion
17. I/0 curve
Figure 4.4A—ISI test sequence results