tech.support@psbel.com

belfuse.com/power-solutions

BCD.00791 Rev. AN, 10-Aug-2021

Page 13 of 18

RCM Series

150 / 300 W DC-DC Converters

© 2021 Bel Power Solutions & Protection

Electromagnetic Emissions

All conducted emissions (fig. 9) have been tested as per EN 55011, group 1, class A. These limits are much stronger than

requested in EN 50121-3-2:2016, table 2.1, and coincide with EN 50121-4:2016, table 1.1. The values in fig. 9 are quasipeak values,

which are always lower then peak values.

The average values must respect a margin of 10 dBµV below the limits for quasipeak.

Radiated emissions have been tested according to EN 55011, group 1, class A . These limits are similar to the requirements of

EN 50121-3-2:2016 and EN 50121-4:2016, both calling up EN 61000-6-4+A1:2011, table 1. The tests were executed with horizontal

and vertical polarization. The worse result is shown in fig. 10.

Note: The highest frequency of the internal sources of EUT is less than 108 MHz. Hence, Radiated Measurement was made up to 1 GHz.

Non-accredited measurement up to 6 GHz are available on request.

0

dBµV

20

40

60

80

110RCM150-24DMQF; Vi = 110 V, Vo = 24 V; Io = 6.25 A

Class A, 3-Oct-2016

EN 55011 A qp

EN 55011 A av

0.2

0.5

1

2

5

10

20 MHz

0

dBµV

20

40

60

80

110RCM300-24DMQF; Vi = 110 V, Vo = 24 V; Io = 12.5 A

Class A, 20-Apr-2017

EN 55011 A av

EN 55011 A qp

0.2

0.5

1

2

5

10

20 MHz

Fig. 9a

110RCM150-24: Typ. disturbance voltage at the input

(V

Fig. 9b

110RCM300-24: Typ. disturbance voltage at the input

(V

30

50

100

200

500

1000 MHz

dBµV/m

10

20

30

40

0

60

VUS EMC Labatory, 110RCM150-24DMQF; Vi = 110 VDC, Vo = 24 V / 6.25 A

Testdistance 10 m, Class A, 3-Oct-2016; ESVS 30, Rhode & Schwarz

JM212

50

dBµV/m

VUS EMC Labatory, 300RCM150-24DMQF; Vi = 110 VDC, Vo = 24 V / 12.5 A

Testdistance 10 m, Class A, 21-Apr-2017; ESVS 30, Rhode & Schwarz

30

50

100

200

500

1000 MHz

dBµV/m

10

20

30

40

0

60

VUS EMC Labatory, 300RCM150-24DMQF; Vi = 110 VDC, Vo = 24 V / 12.5 A

Testdistance 10 m, Class A, 21-Apr-2017; ESVS 30, Rhode & Schwarz

50

JM221

Fig. 10a

110RCM150-24: Typ. radiated disturbances in 10 m

distance (V

Fig. 10b

110RCM300-24: Typ. radiated disturbances in 10 m

distance (V