– completely closed subrack EGT for use in environments with electro-magnetic interference
– subrack is sealed by EMC-shielded part front panels or 84 HP front panel
– all parts chrome-free transparent passivated
Screening against electromagnetic interference
– test procedure: in conformity with VG standard 95373, part 15
– article tested: subrack 84 HP, depth 280 mm, with closed rear and front panel:
– –––––––– closed cover panel
– — — — cover panel with ventilation slots
– – – – – – closed cover panel, additionally equipped with contact spring strips
– back and front panel electrically connected to side panel by means of contact springs
– without contact spring strips, the average shielding amounts to: approx. 50 dB if frequency is between 30 and 100 MHz approx. 40
dB between 100 and 300 MHz and approx. 20 dB for more than 400 MHz
– with contact spring strips the frequency range is approx. 80 dB between 30 and 100 MHz approx. 65 dB between 100 and 300 MHz
approx. 50 dB for more than 400 MHz
1000
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.01
30
40
50
60
70
80
90
100
200
300
400
500
600
700
800
900
4 HE
Frequency [MHz]
Attenuation [dB]
1000
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.01
30
40
50
60
70
80
90
100
200
300
400
500
600
700
800
900
4 HE
Frequency [MHz]
Attenuation [dB]
H-field
E-field
H-field
E-field
19" EMC subracks
N 29
Embedded case
➔
M 48 – 49 19" instert modules accessory
➔
N 26 – 28
Fixing material
➔
N 62
Insert modules 19"
➔
N 34 – 47
19" front panels
➔
N 63
Part front panels
➔
N 51 – 55
19" subracks
➔
N 20 – 25 Profiles for 19" plug-in boxes
➔
N 66
A
B
C
D
E
F
G
H
I
K
L
M
N
