Contacta IL-CONTACTA-FSM Manuale d'uso - Pagina 6

Sfoglia online o scarica il pdf Manuale d'uso per Strumenti di misura Contacta IL-CONTACTA-FSM. Contacta IL-CONTACTA-FSM 12. Field strength meter

Measuring 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.