AN2744 datasheet(31/56 Pages) STMICROELECTRONICS

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AN2744

Board description

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5.2

Conducted disturbances

5.2.1

Conducted emissions

The EN50065-1 standard describes test setup and procedures for this kind of test.

The measures have been done with 220 VAC mains voltage. The test pattern consists of a

continuous transmission of a fixed tone at a frequency of 70.8 kHz (72 kHz center frequency

minus half the FSK frequency deviation, in this case 2400 Hz) which corresponds to a

symbol "1".

The output signal measured at the artificial network has a value of 120 dBµV rms, which

means a 2 V rms signal on the mains output of the board.

The spectrum analyzer performs a peak measure instead of a quasi-peak measure. For

continuous sinusoidal signals, the two types of measurement give the same result.

Figure 25.

Measured input impedance magnitude of the coupling interface in Tx mode for the

86 kHz channel (typical curve)

100

1000

1E+04

1E+05

1E+06

Freq (Hz)

EN50065

EN50065--7

100