HP RM500SL 7.8HIT calibration facts, FastFacts 7.8: HIT calibration facts

7.8HIT 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.

FastFacts 7.8: HIT calibration facts

0611 RM500SL User’s Guide Version 2.8 Page 33