Contacta IL-CONTACTA-FSM Посібник користувача - Сторінка 6
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Друкувати сторінкуMeasuring Frequency Response
Detailed below are two processes that can be used to confirm the
system properly reproduces all of the required frequencies equally in
the bandwidth of 100 to 5KHz. A Test Signal Generator such as the
Contacta TSG1 will be required to perform these tests. Both methods
will yield accurate results.
Method I - Sine wave signal
Send at a minimum the following sine wave signals through the hearing
loop system without adjusting any of the audio or loop level controls:
100Hz, 250 Hz, 500 Hz, 1000 Hz, 2500 Hz, and 5000 Hz. Using the Flat
Spectrum mode record the RMS level generated by each of these. To
meet the IEC specification the levels should not vary by any more than
±3dB.
Method II - Pink noise signal
Send a pink noise signal into the hearing loop system and select the
Third Octave mode on the meter. It will initially start at a 1000Hz center
frequency.
Pressing button "B" will cycle through the frequencies of 100Hz,
200Hz, 500Hz, 1000Hz, 2500Hz and 5000Hz.
IEC 60118-4 Notes and Requirements
The standard as revised notes that within the frequencies of 100Hz to
5000Hz the hearing loop system should equally reproduce all signals. At
a minimum the systems is to be tested at 100Hz, 1KHz and 5KHz.
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