Sound Demodulation - Chauvin Arnoux C.A 43 FILEDMETER Mode D'emploi

SOUND DEMODULATION

The demodulation function allows the amplitude modulation which may be present on the HF
signal to be heard on an internal loud speaker. This detection of modulation is limited to the
audible frequencies between 500 Hz and 5 kHz inclusive.
The best result is obtained for fields measured between 5 V/m and 30 V/m inclusive with a
modulation depth of 50% minimum. As a result of the filtering constants of the instrument,
this function is only available on PEAK mode.
This function is controlled by a switch coupled to a single turn potentiometer (1). The
potentiometer allows adjustment of the sound volume as a function of the field and the depth
of modulation.
Note :
The power consumed by the internal speaker greatly reduces the service life of the battery.
Please only use this function for real applications. We recommend switching OFF the
demodulation function with the switch as soon as it is no longer used.
78