Instructions

67
12. 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 5kHz inclusive.
The best result is obtained for elds measured between 5 V/m and 30 V/m inclusive with a modulation
depth of 50% minimum. As a result of the ltering 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 eld 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.
13. SPECIFICATIONS
13.1 ELECTRICAL SPECIFICATIONS
Measurement extent:
FUNCTION MEASUREMENT EXTENT
V / m 0.1 to 199.9
µW / cm² 0.1 to 1999
A / m 0.1 to 19.99
 Pass band: from 100 kHz to 2,5 GHz
The measurement from 100 kHz to 1 MHz is purely indicative.
 Specied measurement domain:
Measurements are taken in a distant eld in order to obtain a at wave.
The impedance of the ambient eld must be equal to 377 Ω.
RANGE
V/m from
0 to 1 V/m
V/m from
1 to 10 V/m
V/m from 10
to 100 V/m
V/m from 100
to 199.9 V/m
µW/cm² from 0.1
to 199.9 µW/cm²
µW/cm² from 200
to 1999 µW/cm²
(1)
Resolution 0.1 V/m 0.1 V/m 0.1 V/m 0.1 V/m 0.1 µW/cm² 1 µW/cm²
Accuracy
(2)
0.7 V/m 0.5 V/m 1 dB 2 dB 1 dB 2 dB
Stability 0.2 dB
(1)
The power density is limited to the maximum display capacity of 1999µW/cm² corresponding to a eld
of 86.8V/m.
(2)
Instrument only (without probe) : ± 0.5% of the reading ± 0.2% of the range.
Error due to the interchangeability of sensors: ± 0.5dB.