RM500SL
®
User's Guide Version 3.4
June 2011
Test box calibration facts
Test box microphone calibration establishes a correction curve for the uncalibrated test box
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, the message window will turn blue and you will be
prompted to calibrate whenever you attempt a test that uses the test box microphones.
Note that there are two styles of test box 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
Calibrating test box reference microphone.
Calibrating test box reference microphone
Remove any coupler from the coupler microphone before calibration.
1. Position the test box reference microphone opening concentric with the coupler
microphone opening and about 1 – 2 mm from as shown below.
2. Close and seal the test chamber by tightening the latch at the front of the lid.
3. Press <Tests>, then highlight and <PICK> [Test box measures], then highlight and
<PICK> [Calibration].
4. Highlight, then <PICK> [Daily] or [Weekly] to select the calibration interval.
5. Highlight and <PICK> [Calibrate]. See Test box calibration facts
It is recommended that you print a copy of the initial calibration curve and compare it with
your daily or weekly curve. Any change in this curve indicates a drift in either the coupler
or the reference microphone which needs further investigation. See Calibration check for
coupler microphone for an additional check.
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Summary of Contents for RM500SL
Page 1: ...RM500SL User s Guide Version 3 4 March 2010...
Page 9: ...RM500SL User s Guide Version 3 4 June 2011 EC Declaration of Conformity 9...
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Page 43: ...RM500SL User s Guide Version 3 4 June 2011 telecoil test 43...
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Page 78: ...RM500SL User s Guide Version 3 4 June 2011 Screen tour unaided screen 78...
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