measurement of mains decoupling and/or mains coupling loss - running discussion in cispr/a
DESCRIPTION
Measurement of mains decoupling and/or mains coupling loss - running discussion in CISPR/A. Conducting coupling Discussion in CISPR/A/WG2 and CISPR/H/WG2 Concept of the mains decoupling factor Concept of the mains coupling loss Content of to be drafted CD Action in CISPR/A/WG2. - PowerPoint PPT PresentationTRANSCRIPT
L. Dunker / BNetzA/413a 1
Measurement of mains decoupling and/or mains coupling loss -running discussion in CISPR/A
Conducting coupling Discussion in CISPR/A/WG2 and CISPR/H/WG2 Concept of the mains decoupling factor Concept of the mains coupling loss Content of to be drafted CD Action in CISPR/A/WG2
L. Dunker / BNetzA/413a 2
Conducting coupling
Mains
EUTReceiver
TK- lineIasym
Iasym
Radiated emission
Radiated emission
Conducted emission
Uasym
Coupling
L. Dunker / BNetzA/413a 3
CISPR Report 31: Mains decoupling factor /1967
L. Dunker / BNetzA/413a 4
CISPR/A(Sec)67/1985
L. Dunker / BNetzA/413a 5
CISPR/A(Sec)67/1985
L. Dunker / BNetzA/413a 6
Conducting coupling: Measurement procedure
feeding generator mains receiver
ground
mains decoupling factor
VAMN/asym/sym
border of theproperty(s)
disturbance voltage V1
Gen
Rec
L. Dunker / BNetzA/413a 7
Conducting coupling: Measurement procedure
1,0
m
100
k
metallic case about:300 x 200 x 100 mm3
U1
<1,5 m
stic
k an
tenn
a
Mains connection 2 wires
Symmerical feeding
Radio dummy
L. Dunker / BNetzA/413a 8
Result of CISPR/H/WG2 and CISPR/A/WG2 meeting in Cape Town
A concept (CISPR/A/WG2(Battermann/ Dunker) for for the estimation the conducting coupling by the AC-mains was presented in CISPR/H/WG2 and CISPR/A/WG2
This concept of the conducting coupling takes into account the characteristics of the AC-mains which have different attenuation for symmetrical and asymmetrical disturbance emissions.
The concept deviates from the old CISPR/A/Sec)67; July 1985
CISPR/H/WG2 is interested in this measurement procedure and its results for the weighting of limit on mains
CISPR/A/WG2 decided to prepare a draft CD for the measurement equipment and the measurement procedure and to involve CISPR/WG3 in this topic
L. Dunker / BNetzA/413a 9
Concept of the mains decoupling factor
The mains decoupling factor [dB] is defined for the measurement of:
U0 measured on the test site
U1 measured at the antenna’s feed-point
M,asym 0,asym 1,asym D V V
asym1,sym0,symM, VVD
L. Dunker / BNetzA/413a 10
Concept of the mains decoupling factor
0 5 10 15 20 25 300
10
20
30
40
50
60
70
80
90
100Meas. with RX and mains conn. (Comb-Gen. CM) K
f / MHz
UA
MN
/CM-U
RX /
dB
Results of the DM,asym and DM,sym measured in a modern installed flat at 19 sockets (Voltage at 50 Ohm)
0 5 10 15 20 25 300
20
40
60
80
100
120MDF - Meas. with RX and Mains (Comb-Gen. DM) K
f / MHz
UA
MN
/DM-U
RX /
dB
L. Dunker / BNetzA/413a 11
Concept of the “coupling loss” The coupling loss of the mains [dB] is the transfer function
between two point in a network without constant impedance which can be measured by the disturbance current.
Generator with
Feeding
(source)
Mains with
sockets
(channel)
Radio with
powersupply
(victim)
L,M,asym in,asym out,asym C I I
asymout,symin,symM,L, IIC
The coupling loss is defined as:
L. Dunker / BNetzA/413a 12
Concept of the “coupling loss”
0 5 10 15 20 25 300
10
20
30
40
50
60
70
80
90
100Meas. with RX+Mains norm. to feed (Comb-Gen. CM) K
f / MHz
dC
M/C
M /
dB
Results of the CL,M,asym and CL,M,sym measured in a modern installed flat at 19 sockets
0 5 10 15 20 25 300
20
40
60
80
100
120
Meas. with RX and mains - normalized to feed (Comb-Gen. DM) K
f / MHz
dD
M/C
M /
dB
L. Dunker / BNetzA/413a 13
Content of to be drafted CD
Definitions and characteristic of conducted coupling: Definitions of mains decoupling Definitions of coupling loss Estimation of maximal allowed disturbance voltage
Requirements to the artificial disturbance source Output voltage (symmetrical and asymmetrical) Impedances (symmetrical and asymmetrical) Conditions for the connection to PE (Battery powered or mains
powered) Requirement to the “coupling device”
L. Dunker / BNetzA/413a 14
Content of to be drafted CD Requirement to the radio dummy
Size and type of the radio case and stick antenna Input impedance to the dummy connected with the stick
antenna (impedance converter of CISPR 25) Mains connection from dummy case (capacitive) Powered by battery Indication of voltage at the feed-point of the stick antenna
(battery powered receiver or spectrum ananlyzer) Conditions for the connection to PE
L. Dunker / BNetzA/413a 15
Content of to be drafted CD
Measurement procedure Measurement on the test site (asymmetrical and symmetrical
voltage) Handling of disturbance source and radio dummy (e. g.
distance to the environment,…) Measurement of the voltage at the antenna feet-point (mains
decoupling) or the currents (coupling loss) Calculate the wanted values: mains decoupling or coupling
loss by mean and standard deviation Estimation of the symmetrical decoupling of the mains taking
into account mean, standard deviation and the t-quantile
L. Dunker / BNetzA/413a 16
Action in CISPR/A/WG2
Discussion of the draft CD during the midterm meeting in Frankfurt and decision for further actions
It is expected that the CD is basically accepted and this CD is published short after the meeting.
The next discussion in CISPR/A could be at the meeting in Sweden.
Any comments / cooperation from / with CISPR/I/WG3 are / is welcome.