HP RM500SL Manuale Utente Scaricare il pdf (Pagina 33)

0611 RM500SL User’s Guide Version 2.8 Page 33

7.8 HIT calibration facts

FastFacts 7.8: HIT calibration facts

HIT microphone calibration establishes a correction curve for the uncalibrated HIT

reference microphone by comparison with the factory calibrated coupler

microphone. It may be performed as often as desired but will be invalidated at 1

am the following day or at 1 am the following Monday, depending on the choice of

Daily or Weekly calibration interval. After the calibration has expired, you will be

prompted to calibrate whenever you attempt a test that uses the HIT microphones.

Note that there are two styles of HIT reference microphones. The newer style is

larger but responds beyond 16 kHz and has a lower noise floor. The two have

different correction curves, as shown below, but will produce the same test results,

once calibrated. Your calibration curve should be similar to one of these and

should remain stable over time. Irregularities in the calibration curve may be the

result of positioning errors. See 7.9: Calibration of HIT reference microphone.

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HP RM500SL Manuale Utente Pagina 33