Extech Instruments 407780A User Manual page 6

13. dB: Sound level unit (decibel)
14. A, C: A or C frequency weighting indicator.
15. IMP: Impulse time weighting indicator
16. OVER: Over‐range indicator appears flashing when over‐range measurements have been
included in the sound level measurement data recording session.
17. SLOW: Slow time weighting indicator
18. FAST: Fast time weighting indicator
19.  : Indicates that integrating sound level measurements have been stopped.
20. : Indicates that integrating sound level measurements are paused.
21. : Start and continuous integrating measurement indicator.
22. UNDER: Under‐range indicator appears flashing when under‐range measurements have
been included in the sound level measurement data recording session.
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