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Fischer Custom Communications, Inc.
Fisher Custom Communications, inc.(fcc) is a manufacturer of electric and magnetic field sensors for military and commercial applications. FCC has over 30 years of experience in the design and development of RF current probes and electromagnetic sensors. Over 100 probes have been developed to meet specific customer and compliance testing requirements. Fisher Custom Communications probes are currently being used for compliance testing in accord with MIL-Std-461/462 as well as many other EMI, ESD and susceptibility specifications. The product line is completed through
CDN 's
LISN 's
100 to 200 AMP CDN's
FCC's family of CDN's just got bigger. 100 and 200 AMP CDN's are now available for IEC 1000-4-6 conducted immunity testing from 150 kHz to 80 MHz.
Applications
EN 61000-4-6 requires that the EUT be tested from 150 kHz to 80 MHz with the capability to test up to 230 MHz. No test levels have been imposed in the 9 kHz to 150 kHz region because of the low probability of causing electronic systems to fail from with either intentional or unintentional radiators.
The specification has three open circuit voltage levels 1, 3, and 10. These levels have been selected because they represent the mid range of radiated fields.
Coupling and Decoupling Networks
The common mode current disturbance signal can be delivered to the EUT using a variety of coupling networks to inject the signal onto the unscreened cables, shielded cables, balanced cables, coaxial cables and power mains.
Decoupling networks are used to insure that the disturbance signal does not influence the auxiliary equipment and are placed between the EUT and the auxiliary equipment. One decouling network is inductive and uses a high impedance choke. The second decoupling network combines resistive and inductive technique by using ferrite toroids that are placed around the cables connecting the EUT and the auxiliary equipment. These coupling and decouling networks can be separate or combined in the same instrument.
Choosing a CDN
The Coupling/Decoupling Network or CDN incorporates both the decoupling and coupling circuitry in the same housing. The CDN contains integrated direct capacitive coupling along with a high impedance choke for inductive decoulping.
The CDN acts as a low pass filter preventing the susceptibility test signals from interfering with the auxiliary equipment. A family of CDN's are required to match the wide variety electronic instruments, systems, computer, printers and appliances. Fischer Custom Communications, Inc. offers over 35 different CDN's and custom configurations are available. All CDN's maintain the 150 W impedance from 150 kHz to 230 MHz.
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Specifications
EUT/AE Port
AC Voltage
DC Voltage
Current Rating
|
C Series
<350 V
<600 V
1.0 amp
|
S Series
<350 V
<600 V
3.0 amp
|
M Series
<480 line to line
<600 V
16 amp to 300 amp*
|
AF Series
<350 V
<600 V
3.0 amp
|
T Series
<350 V
<600 V
3.0 amp
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I/O Connectors
|
BNC
|
S2 to S50
Centronics, D Sub min
|
Multi Contact Safety Socket
|
Multi Contact Safety Socket
Audio Socket
|
Multi Contact Safety Socket
|
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Common Mode Impedance at
EUT Connector
150kHz to 26kHz
26kHz to 80kHz
80kHz to 230kHz
|
150±20 ‡
150±60/-45 ‡
150±60/-45 ‡
|
150±20 ‡
150±60/-45 ‡
150±60/-45 ‡
|
150±20 ‡
150±60/-45 ‡
150±60/-45 ‡
|
150±20 ‡
150±60/-45 ‡
150±60/-45 ‡
|
150±20 ‡
150±60/-45 ‡
150±60/-45 ‡
|
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Disturbance Coupling Circuit
Frequency Range
Connector
RF Voltage Level
|
150kHz to 230MHz
50 ‡ BNC
<40 V
|
150kHz to 230MHz
50 ‡ BNC
<40 V
|
150kHz to 230MHz
50 ‡ BNC
<40 V
|
150kHz to 230MHz
50 ‡ BNC
<40 V
|
150kHz to 230MHz
50 ‡ BNC
<40 V
|
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Voltage Attenuation generator/EUT
|
10 dB ± 1 dB
|
10 dB +1 dB/-3 dB
|
10 dB +1 dB/-3 dB
|
10 dB +1 dB/-3 dB
|
10 dB +1 dB/-3 dB
|
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Insertion Loss EUT/AE
|
<1 dB at 230MHz
|
<3 dB up to 20 kHz
<10 dB up to 1 MHz
<20 dB up to 10 MHz
|
<0.1 dB up to 400 Hz
<8 dB at 10 kHz
<45 dB at 150 kHz
|
<0.5 dB DC to 20 kHz
<30 dB at 150 kHz
<20 dB at 230 MHz
|
<8 dB at 150 kHz
<20 dB at 1 MHz
<30 dB at 2 MHz
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|
Coupling Factor
|
0 dB ± 1 dB
|
0 dB + dB/-3 dB
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0 dB + dB/-3 dB
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0 dB + dB/-3 dB
|
0 dB + dB/-3 dB
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Decoupling Attenuation Generator/AE
|
>50 dB up to 100 MHz
>20 dB at 230MHz
|
>50 dB up to 20 MHz
>20 dB at 230MHz
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>50 dB up to 20 MHz
>20 dB at 230MHz
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>50 dB up to 30 MHz
>20 dB at 230MHz
|
Unbalanced Attenuation Generator/EUT
>70 dB at 150 kHz
>60 dB at 1 MHz
>40 dB at 10 MHz
>35 dB above 20 MHz
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M Series: The M1 power line CDN is used to couple common mode CW and modulated signals onto single power line systems. The M1 is ideal for automotive systems using the chassis as the DC return. The M2 is commonly used for 2 wire power conductor cables and the M3 is used for two line single phase cables. The M4 is used on three phase power mains and the M5 is used on three phase systems with neutral and protected earth ground conductors. Fischer Custom Communications, Inc. offers more than 15 powerline configurations with current rating of 16, 25, 32, 50, 100, 200 and 300 amperes.
T Series: The T series CDN is used to couple RF CW and modulated signals into balanced or unshielded lines. It permits normal operation of balanced circuits with impedance to 600 W up to 1 MHz and 1000 W impedance up to 100 kHz. It is available in 2, 4 or 8 line configurations.
S Series: The S series CDN is used to test shielded cables and is available with 2 pins to 50 pins.
C Series: The C series CDN is used to couple RF interference signals onto shields of RF coaxial cables.
AF Series: The AF series is ideal for unshielded audio cables and is available with 2 pins to 50 pins. This CDN allows 600 W systems to operate normally up to 10 kHz and 1000 W systems to operate up to 5 kHz. It is important to review the impedance and frequency of operation of audio systems to insure there is no influence on the CDN.
Monitor Current Probes
|
Current Probe Selection Guide
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PHYSICAL DIMENSIONS
(mm)
|
MAXIMUM PRIMARY CURRENT
(AMPERES)
|
|
Model
|
Drawing
Number
|
A
I.D.
|
B
O.D.
|
C
Ht
|
Zt W1
|
dB W1
|
Con
nector
|
DC-60 Hz
|
400 Hz
|
RF (CW)
|
Frequency
|
|
F - 10
|
1
|
32
|
94
|
64
|
0.25
|
-12
|
N
|
350
|
350
|
100
|
10 Hz - 2 MHz
|
|
F - 10 - 1
|
1
|
32
|
94
|
64
|
0.03
|
-30
|
N
|
100
|
50
|
25
|
10 Hz - 2 MHz
|
|
F - 10A
|
1
|
67
|
142
|
53
|
0.25
|
-12
|
N
|
350
|
350
|
100
|
10 Hz - 2 MHz
|
|
F - 10A-1
|
1
|
67
|
142
|
53
|
0.03
|
-30
|
N
|
100
|
50
|
25
|
10 Hz - 2 MHz
|
|
F - 12
|
1
|
32
|
94
|
64
|
0.32
|
-10
|
N
|
350
|
350
|
100
|
10 Hz - 3 MHz
|
|
F - 14
|
1
|
32
|
94
|
64
|
0.12
|
-18
|
N
|
400
|
400
|
50
|
10 Hz - 500 kHz
|
|
F - 14 - 1
|
1
|
32
|
94
|
64
|
0.023
|
-33
|
N
|
400
|
400
|
25
|
10 Hz - 500 kHz
|
|
F - 14 - C
|
1
|
32
|
98
|
38
|
0.03
|
-30
|
N
|
100
|
50
|
10
|
10 Hz - 2 MHz
|
|
F - 14A
|
1
|
67
|
142
|
53
|
0.12
|
-18.5
|
N
|
400
|
400
|
50
|
10 Hz - 500 kHz
|
|
F - 14A - 1
|
1
|
67
|
142
|
53
|
0.03
|
-30.5
|
N
|
400
|
400
|
25
|
10 Hz - 500 kHz
|
|
F - 16
|
1
|
32
|
94
|
64
|
4
|
12
|
N
|
400
|
400
|
50
|
10 Hz - 70 MHz
|
|
F - 16 -1
|
1
|
32
|
94
|
64
|
0.5
|
-6
|
N
|
400
|
400
|
3
|
10 Hz - 70 MHz
|
|
F - 16A
|
1
|
67
|
142
|
53
|
4
|
12
|
N
|
800
|
400
|
50
|
10 Hz - 70 MHz
|
|
F - 16A -1
|
1
|
67
|
142
|
53
|
0.5
|
-6
|
N
|
800
|
400
|
3
|
10 Hz - 70 MHz
|
|
F - 16M
|
1
|
32
|
98
|
38
|
0.5
|
-6
|
N
|
100
|
100
|
2
|
100 Hz - 50 MHz
|
|
F - 33 - 1
|
1
|
32
|
71
|
19
|
5
|
14
|
BNC*
|
100
|
100
|
10
|
10 kHz - 250 MHz
|
|
F - 33 - 2
|
1
|
32
|
71
|
19
|
1
|
0
|
BNC*
|
100
|
100
|
2
|
1 kHz - 250 MHz
|
|
F - 33 - 3
|
1
|
32
|
71
|
19
|
4
|
12
|
BNC*
|
100
|
100
|
10
|
1 kHz - 200 MHz
|
|
F - 33 -4
|
?
|
?
|
?
|
?
|
1
|
0
|
BNC*
|
100
|
100
|
2
|
1 kHz - 100 MHz
|
|
F - 33 - 5
|
3A
|
20
|
51
|
13
|
1.3
|
2.3
|
SMA
|
25
|
25
|
10
|
10 kHz - 140 MHz
|
|
F - 33 - 6
|
1
|
3
|
19
|
19
|
0.8
|
-2
|
SMA
|
5
|
5
|
1
|
1 kHz - 200 MHz
|
|
F - 35
|
1
|
32
|
98
|
38
|
1
|
0
|
N
|
350
|
200
|
3
|
100 Hz - 100 MHz
|
|
F - 35A
|
1
|
32
|
98
|
38
|
1
|
0
|
N
|
350
|
200
|
3
|
100 Hz - 100 MHz
|
|
F - 35A-FW
|
?
|
32
|
71
|
19
|
1
|
0
|
BNC*
|
350
|
400
|
2
|
10 Hz - 50 MHz
|
|
F - 35 - 1
|
1
|
32
|
98
|
38
|
0.15
|
-16.5
|
N
|
350
|
100
|
6
|
10 kHz - 100 MHz
|
|
F - 40
|
1
|
32
|
98
|
38
|
1
|
0
|
N
|
350
|
350
|
100
|
100 Hz - 20 MHz
|
|
F - 40 -5
|
1
|
67
|
153
|
102
|
0.1
|
-20
|
N
|
1000
|
1000
|
100
|
10 Hz - 50 MHz
|
|
F - 42
|
1
|
32
|
98
|
38
|
6
|
15.5
|
N
|
350
|
350
|
50
|
1 kHz - 100 MHz
|
|
F - 43
|
?
|
32
|
98
|
38
|
12
|
4
|
N
|
100
|
100
|
50
|
100 Hz - 100 MHz
|
|
F - 50
|
1
|
32
|
71
|
19
|
9
|
19
|
BNC*
|
300
|
300
|
20
|
100 kHz - 500 MHz
|
|
F - 51
|
1
|
32
|
98
|
38
|
10
|
20
|
N
|
350
|
350
|
50
|
10 kHz - 500 MHz
|
|
F - 52
|
1
|
40
|
117
|
38
|
10
|
20
|
N
|
350
|
350
|
50
|
10 kHz - 500 MHz
|
|
F - 55
|
1
|
32
|
98
|
38
|
1
|
0
|
N
|
350
|
350
|
3
|
10 kHz - 500 MHz
|
|
F - 55A
|
1
|
32
|
98
|
38
|
0.1
|
-20
|
N
|
350
|
350
|
10
|
1 kHz - 500 MHz
|
|
F - 61
|
1
|
32
|
71
|
19
|
16
|
24
|
BNC*
|
200
|
200
|
20
|
1 MHz - 1 GHz
|
|
F - 62
|
1
|
32
|
71
|
19
|
13
|
22
|
BNC*
|
200
|
200
|
20
|
10 MHz - 1 GHz
|
|
F - 65
|
1
|
32
|
98
|
38
|
1
|
0
|
N
|
350
|
350
|
3
|
100 kHz - 1 GHz
|
|
F - 65A
|
1
|
32
|
98
|
38
|
.1
|
-20
|
N
|
350
|
350
|
10
|
10 kHz - 1 GHz
|
|
F - 70
|
1
|
70
|
125
|
38
|
1
|
0
|
N
|
350
|
350
|
3
|
1 kHz - 100 MHz
|
|
F - 71
|
1
|
70
|
125
|
38
|
8
|
18
|
N
|
200
|
200
|
25
|
10 kHz - 500 MHz
|
|
F - 72
|
1
|
67
|
142
|
53
|
5
|
14
|
N
|
350
|
350
|
100
|
100 Hz - 100 MHz
|
|
F - 72 -1
|
1
|
67
|
142
|
53
|
0.15
|
-16
|
N
|
350
|
150
|
12
|
100 Hz - 100 MHz
|
|
F - 72 -2
|
1
|
67
|
142
|
53
|
0.005
|
-46
|
N
|
200
|
70
|
60
|
100 Hz - 100 MHz
|
|
F - 73
|
1
|
67
|
142
|
53
|
2
|
6
|
N
|
350
|
350
|
200
|
10 Hz - 30 MHz
|
|
F - 75
|
1
|
70
|
125
|
38
|
1
|
0
|
N
|
350
|
350
|
3
|
10 kHz - 500 MHz
|
|
F - 80
|
1
|
127
|
197
|
41
|
5
|
14
|
N
|
350
|
350
|
100
|
1 kHz - 100 MHz
|
|
F - 80 - 1
|
1
|
127
|
197
|
41
|
1
|
0
|
N
|
350
|
350
|
2
|
1 kHz - 100 MHz
|
|
F - 81
|
1
|
127
|
197
|
41
|
1
|
0
|
N
|
350
|
350
|
100
|
100 Hz - 10 MHz
|
|
F - 2000
|
1
|
13
|
37
|
17
|
16
|
24
|
SMA
|
100
|
100
|
10
|
10 MHz - 3 GHz
|
|
PHYSICAL DIMENSIONS
(mm)
|
MAXIMUM PRIMARY CURRENT
(AMPERES)
|
|
Model
|
Drawing Number
|
A
|
B
|
C
|
D
|
E
|
Zt W1
|
dB W1
|
Connector
|
DC-60 Hz 400Hz
|
RF(CW)
|
Pulse2
|
Frequency
|
|
F-32-9B
|
4
|
6
|
152
|
46
|
28
|
121
|
3.2
|
10
|
SMA
|
100 100
|
10
|
100
|
100 kHz - 300Mhz
|
*Type N and SMA optional
|
Clip-on Miniature Probes
|
|
PHYSICAL DIMENSIONS
(mm)
|
MAXIMUM PRIMARY CURRENT
(AMPERES)
|
|
Model
|
Drawing
|
A
|
B
|
C
|
D
|
Zt W1
|
dB W1
|
Con
nector
|
DC-60 Hz
|
400Hz
|
RF(CW)
|
Frequency
|
|
F-36-1
|
5
|
5
|
54
|
13
|
19
|
4
|
12
|
SMA
|
20
|
20
|
1
|
100 kHz - 200MHz
|
|
F-36-2
|
5
|
5
|
54
|
13
|
19
|
1
|
0
|
SMA
|
20
|
20
|
1
|
1 kHz - 200MHz
|
|
F-36-4
|
5
|
5
|
54
|
13
|
19
|
22
|
27
|
SMA
|
20
|
20
|
1
|
1 kHz - 1GHz
|
|
Skin Current Probes
|
|
PHYSICAL DIMENSIONS
(mm)
|
MAXIMUM PRIMARY CURRENT
(AMPERES)
|
|
Model
|
Drawing Number
|
A
|
B
|
C
|
Zt W1
|
dB W1
|
Con
nector
|
DC-60 Hz
|
400Hz
|
RF(CW)
|
Frequency
|
|
F-90
|
2
|
89
|
51
|
38
|
0.08
|
-22
|
N
|
5000
|
300
|
10
|
10 kHz - 1MHz
|
|
F-91
|
2
|
89
|
51
|
38
|
1.4
|
3
|
N
|
5000
|
300
|
20
|
1 MHz - 100 MHz
|
|
F-92
|
2
|
76
|
44
|
38
|
0.9
|
-1
|
BNC
|
5000
|
300
|
10
|
10MHz - 400MHz
|
|
F-96
|
2
|
19
|
13
|
10
|
1.26
|
2
|
SMA
|
10
|
10
|
10
|
1 MHz - 450 MHz
|
|
F-97
|
2
|
10
|
13
|
8
|
.045
|
-7
|
SMA
|
10
|
10
|
10
|
10MHz- 1.5 GHz
|
|
1. Probes calibrated with 50W ± j0 W Load Impedance
|
2. Depends upon the pulse width and pulse repitition rate
|
Bulk Current Injection Probe Master Guide
|
|
Clamp-on
Physical
Dimensions*
|
Rated
Watts
CW
|
Insertion Loss
|
|
Model #
|
ID
(A)
|
OD
(B)
|
Ht.
(C)
|
< or =
6 dB
|
< or =
10 dB
|
< or =
15 dB
|
< or =
20 dB
|
< or =
25 dB
|
|
F-120-1
|
40
|
127
|
70
|
100
|
|
|
1 MHz -
125 MHz
|
50 KHz -
150 MHz
|
25 KHz -
175 MHz
|
|
F-120-2
|
40
|
127
|
70
|
100
|
|
500 KHz -
230 MHz
|
175 KHz -
250 MHz
|
90 KHz -
275 MHz
|
50 KHz -
300 MHz
|
|
F-120-3
|
40
|
127
|
70
|
125
|
500 KHz -
700 KHz
|
200 KHz -
15 MHz
|
100 KHz -
150 MHz
|
60 KHz -
200 MHz
|
30 KHz -
250 MHz
|
|
F-120-3B
|
32
|
94
|
64
|
100
|
475 KHz -
1 MHz
|
200 KHz -
30 MHz
|
100 KHz -
275 MHz
|
60 KHz -
300 MHz
|
40 KHz -
350 MHz
|
|
F-120-4
|
40
|
127
|
70
|
125
|
|
|
120 KHz -
125 MHz
|
600 KHz -
150 MHz
|
20 KHz -
175 MHz
|
|
F-120-4A
|
40
|
127
|
70
|
200
|
|
|
60 KHz -
125 MHz
|
30 KHz -
125 MHz
|
12 KHz -
175 MHz
|
|
F-120-5
|
66
|
142
|
54
|
100
|
500 KHz -
1 MHz
|
200 KHz -
15 MHz
|
100 KHz -
150 MHz
|
60 KHz -
200 MHz
|
30 KHz -
250 Mhz
|
|
F-120-6
|
40
|
127
|
70
|
100
|
|
|
3 MHz -
400 MHz
|
400 KHz -
450 MHz
|
100 KHz -
500 MHz
|
|
F-120-6A
|
40
|
127
|
70
|
100
|
|
300 KHz -
275 MHz
|
70 MHz -
450 MHz
|
30 KHz -
475 MHz
|
13 KHz -
500 MHz
|
|
F-120-7
|
63
|
153
|
102
|
125
|
|
|
400 KHz -
100 MHz
|
100 KHz -
175 MHz
|
40 KHz -
190 MHz
|
|
F-120-8
|
40
|
127
|
134
|
200
|
700 KHz -
100 MHz
|
300 KHz -
275 MHz
|
150 KHz -
375 MHz
|
75 KHz -
400 MHz
|
40 KHz -
425 MHz
|
|
F-120-8A
|
40
|
127
|
134
|
200
|
|
200 KHz -
125 MHz
|
70 KHz -
155 MHz
|
35 KHz -
165 MHz
|
20 KHz -
175 MHz
|
|
F-120-8B
|
40
|
127
|
134
|
200
|
|
350 KHZ -
475 MHz
|
200 KHz -
520 MHz
|
110 KHz -
540 MHz
|
60 KHz -
550 MHz
|
|
F-120-9
|
40
|
127
|
70
|
100
|
|
120 KHz -
230 MHz
|
50 KHz -
275 MHz
|
25 KHz -
300 MHz
|
13 KHz -
325 MHz
|
|
F-120-9B
|
32
|
94
|
64
|
100
|
|
150 KHz -
80 MHz
|
50 KHz -
200 MHz
|
25 KHz -
275 MHz
|
15 KHz -
300 MHz
|
|
F-130
|
40
|
117
|
38
|
50
|
30 MHz -
400 MHz
|
10 MHz -
600 MHz
|
6 MHz -
700 MHz
|
4 MHz -
725 MHz
|
|
|
F-130A
|
32
|
94
|
64
|
50
|
4 MHz -
450 MHz
|
1 MHz -
550 MHz
|
700 KHz -
600 MHz
|
500 KHz -
625 MHz
|
|
|
F-130-1
|
40
|
127
|
70
|
200
|
10 MHz -
350 MHz
|
5 MHZ -
510 MHz
|
3 MHz -
550 MHz
|
2 MHz -
570 MHz
|
1 MHz -
575 MHz
|
|
F-130-1A
|
40
|
127
|
70
|
400
|
7.5 MHz -
350 MHz
|
3.5 MHz -
525 MHz
|
3 MHz -
580 MHz
|
1.5 MHz -
600 MHz
|
1 MHz -
850 MHz
|
|
F-130-2
|
51
|
178
|
102
|
700
|
10 MHz -
250 MHz
|
3 MHz -
400 MHz
|
2 MHz -
580 MHz
|
500 KHz -
550 MHz
|
300 KHz -
570 MHz
|
|
F-130-3
|
66
|
142
|
54
|
100
|
15 MHz -
250 MHz
|
7 MHz -
350 MHz
|
5 MHz -
450 MHz
|
2 MHz -
500 MHz
|
|
|
F-140
|
40
|
127
|
70
|
100
|
2 MHz -
350 MHz
|
900 KHz -
700 MHz
|
450 KHz -
1000 MHz
|
200 KHz -
1300 MHz
|
150 KHz -
1350 MHz
|
|
F-140A
|
40
|
127
|
70
|
100
|
100 KHz -
350 MHz
|
100 KHZ -
700 MHz
|
100KHz -
1000 MHz
|
100 KHz -
1300 MHz
|
100 KHz -
1350 MHz
|
* All dimensions are in millimeters
Low Frequency Pulse Injection
Injection Probe Models F-120-1, F-120-4, F-120-4A, F-120-6 and F-120-6A can be used as pulse injection sources as well as sensitive monitoring probes. These probes can inductively couple transients having risetimes as short as 5 nanoseconds and a half pulse width duration of 100 microseconds. When used as monitor probes, these injection probes have a useable frequency range of 10 KHz to 200 MHz with a transfer impedance of +20 dB K2 from 200 KHz to 150 MHz.
Line Impedance Stablization Networks
Fischer Custom Communications, Inc. develops and manufactures Line Impedance Stabilization Networks or Artificial Mains Networks covering the frequency range from 6 kHz to 1,000 MHz.
Line Impedance Stabilization Networks (LISN) are specialized low pass filter networks used to measure common mode conducted emissions from power lines. Fischer Custom Communications, Inc. has developed over 20 different Line Impedance Stabilization Networks to meet compliance testing requirements and custom customer needs. FCC LISN's are available for pre-compliance and compliance testing in accord with CISPR, VDE, IEC, DO-160 and Mil-Std. 461/462 Rev D.
The LISN must maintain a characteristic impedance to the EUT and isolate the EUT from unwanted RF signals on both the DC and AC power source while allowing the necessary voltage and current to be delivered to the EUT. The LISN provides a 50Ω output impedance for measurement of RF emissions produced by the EUT. A typical test configuration is shown.
Transfer impedance, voltage rating, current rating, number of power conductors and connector types are the key parameters in the selection of an LISN.
The impedance versus frequency of an LISN must match the requirements of the test specification being applied to the EUT. Most LISN attributes are defined in CISPR 16-1. The most widely used LISN's present a 50Ω impedance to the EUT. The 50Ω impedance was selected because theoretical and empirical data have shown that the power circuitry statistically looks like a 50Ω impedance to standard electronic equipment and RF test equipment is typically designed for 50Ω input. The bandwidth is typically determined by the operating frequency of the potential victims of the EUT's conducted emissions. The majority of conducted emission measurements are carried out form 150 kHz to 30 MHz. This insures that electronic equipment do not interfere with VLF, HF radio communication systems as well as other electronic devices operating at this frequency.
A prime example of this type of LISN is the 50Ω50 µH configuration defined in CISPR 16-1. The schematic and the transfer impedance for this LISN are shown below. The CISPR 16-1 limit lines are shown in bold.  
The model FCC-LISN-50-25-2 is produced in accord with the required schematic of CISPR 16-1 and meets the frequency requirements. The impedance versus frequency curve of this LISN is superimposed on the impedance curve of for the 50Ω50 µH configuration. The 50 W 50 µH configuration is often used for Mil Std conducted emission testing from 10 kHz to 10 MHz. For specific details refer to Mil Std 461/462 D.
In addition to this LISN there are 50Ω versions used to test both to lower and higher frequencies. VDE 0876 and CISPR 16-1 can require conducted emission measurements on electronic devices from 9 kHz to 30 MHz. In order to extend the frequency to 9 kHz a 250 µH inductor and additional resistor and capacitance networks are added to the 50Ω50 µH configuration. CISPR 16-1 defines this LISN as 50Ω50 µH + 5 W. This type of LISN is often used when testing equipment with switch mode power supplies.
In contrast the aerospace, automotive and aircraft industries require conducted emission testing to frequencies higher than 30 MHz. To achieve the higher bandwidth a 5 µH inductor is used.
Voltage and current rating of the LISN are the second characteristic. It is important so select LISN's with ratings that allow the EUT to operate as intended. Fischer Custom Communications, Inc. offers LISN's with voltage rating from 240 to 500 volts RMS line to line and current ratings from 16 A to 200 A..
The third parameter is the number of power conductors or lines. EMI specifications require all EUT power leads except ground leads to be tested for conducted emissions. Any neutral or ground wires not connected to the chassis inside the EUT must be tested. DC and AC single phase power circuits must be tested using LISN modules containing two lines. A delta, three phase power network requires tests to be conducted with a LISN's containing three power conductors, and a Y or star, three phase system must be tested with LISN modules having four lines. To maximize flexibility Fischer Custom Communications, Inc. offers LISN modules containing one, two and four power conductors.
Fischer Custom Communications Inc. offers over twenty connectors. The key characteristics are electrical and mechanical safety in compliance with IEC 1010, not cause the impedance of the LISN to vary and match the EUT power mains requirement. All Fischer Custom Communications Inc. LISN's come with transfer impedance curves demonstrating compliance with specifications. We strongly recommend that IEC 320 or NEMA connectors be used to eliminate power cords.
All of Fischer Custom Communications, Inc. LISN's are easily mounted to the ground plane using our standard baseplate. Additional grounding is available.
|
LISN Selection Guide Codes
|
|
Chassis Dimensions
|
#1
#2
#3
#4
#5
#6
#7
|
23 cm X 15 cm X 13 cm
31 cm X 18 cm X 16 cm
38 cm X 23 cm X 18 cm
38 cm X 31 cm X 31 cm
61 cm X 36 cm X 36 cm
76 cm X 46 cm X 46 cm
76 cm X 61 cm X 51 cm |
|
|
Connector Code
|
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
|
Multi-Contact Satety Socket
Superior Plug and Jack Safety Socket
IEC 320, 10 A / 16A Power
IEC 320, 10 A / 16A Power
French /Belgium 16 A Power
BS 1363 13 A British Power
CEE 7/7 16A Schuko Berman Power
Nema 5-15, 15 A US Power
Nema 5-15, 15 A US Power
IEC 309, 16 A 3-Wire Power
IEC 309, 16 A 3-Wire Power
Hubbel 330P6W, 30 A 3-Wire US Power
Hubbel 330P6W, 30 A 3-Wire US Power
Hubbel 330P6W, 30 A 3-Wire US Power
Hubbel 330P6W, 30 A 3-Wire US Power
IEC 309, 32 A 5-Wire Power
IEC 309, 32 A 5-Wire Power
IEC 309, 32 A 5-Wire Power
LC Coaxial for Tempest
|
|
|
Test Type Code
|
01
02
03
04
05
06
07
08
09 |
CISPR / EN
FCC Part 15 / ANSI 63.4
FCC Part 18
Mil Std 461/462 Rev C
Mil Std 461/462 Rev D
D0 - 160 Faa
SAE J1113
TEMPEST
VCE 0876, Part 1
|
|
Filtered LISN's remotely switched LISN's and low profile LISN's for under turn table mounting and special versions operating to 1 GHz are now available.
Remotely switched LISN's may be controlled by the remote control or via a personal computer (PC) with a digital I/O card that can output 0-5 volt DC logic levels. The remote control and 50 foot cable are supplied with matching 9-pin D-type connectors. The remote connector is filtered to prevent external noise from entering the LISN enclosure.
LISN Selection Guide
| Model |
Maximum
Frequency |
Network
Inductance |
Maxi
mum
Current
|
*Standard
Maximum Voltage |
Standard Power
Source Frequency |
# of Power
Conductors |
Chassis
Type |
Power Connector
Options |
Test Type |
| FCC-LISN-5-50-1 |
0.1-100 MHz |
50W/5µH |
50 A |
240 |
DC - 60Hz |
1 |
#1 |
2 |
01, 02 & 04
|
| FCC-LISN-5-50-1-DO-160 |
0.1-400 MHz |
50W/5µH |
50 A |
240 |
DC - 60Hz |
1 |
#1 |
2 |
06 & 07
|
| FCC-LISN-5-50-1-T |
0.1-1,000 MHz |
50W/5µH |
50 A |
240 |
DC - 60Hz |
1 |
#1 |
19 |
8
|
| FCC-LISN-5-100-1 |
0.1-65 MHz |
50W/5µH |
100 A |
240 |
DC - 60Hz |
1 |
#2 |
2 |
01, 02, 04, 07
|
| FCC-LISN-50-50-1 |
0.15-100MHz |
50W/50µH |
50 A |
240 |
DC - 60Hz |
1 |
#2 |
2 |
01, 02, 05
|
| FCC-LISN-50-100-1 |
0.15-30 MHz |
50W/50µH |
100 A |
240 |
DC - 60Hz |
1 |
#4 |
2 |
01, 02, 05
|
| FCC-LISN-50-200-1 |
0.15-30 MHz |
50W/50µH |
200 A |
240 |
DC - 60HZ |
1 |
#5 |
2 |
01, 02, 05
|
| FCC-LISN-57-50-1 |
0.01-10MHz |
50W/57µH |
50 A |
240 |
DC - 60HZ |
1 |
#2 |
2 |
4
|
| FCC-LISN-50-25-2 |
0.15-100MHz |
50W/50µH |
25 A |
240 |
DC - 60HZ |
2 |
#3 |
01-10 |
01,02 & 05
|
| FCC-LISN-50-32-2 |
0.15-100MHz |
50W/50µH |
32 A |
240 |
DC - 60HZ |
2 |
#3 |
01 - 10, 12
|
01,02 & 05
|
| FCC-LISN-50-50-2 |
0.15-100MHz |
50W/50µH |
50 A |
240 |
DC - 60HZ |
2 |
#4 |
2
|
01 & 02
|
| FCC-LISN-50-32-4 |
0.15-100MHz |
50W/50µH |
32 A |
240 |
DC - 60HZ |
4 |
#4 |
01,13,15,16
|
01, 02 & 05
|
| FCC-LISN-50-50-4 |
0.15-100MHz |
50W/50µH |
50 A |
240 |
DC - 60HZ |
4 |
#4 |
02, 17
|
01, 02 & 05
|
| FCC-LISN-50-100-4 |
0.15-30MHz |
50W/50µH |
100 A |
240 |
DC - 60HZ |
4 |
#6 |
02, 18
|
01, 02 & 05
|
| FCC-LISN-50/250-25-2 |
0.009-100MHz |
50W/50µH + 5W
50/250 µH |
25 A |
240 |
DC - 60HZ |
2 |
#4 |
01 - 10
|
01 & 09
|
| FCC-LISN-50/250-32-2 |
0.009-100MHz |
50W/50µH + 5W
50/250 µH |
32 A
|
240 |
DC - 60HZ |
2 |
#4
|
01, 10, 12
|
01 & 09
|
| FCC-LISN-50/250-32-4 |
0.009-100MHz |
50W/50µH + 5W
50/250 µH |
32 A
|
240 |
DC - 60HZ |
4 |
#5
|
01, 13,15, 16
|
01 & 09
|
| FCC-LISN-50/250-50-2 |
0.009-100MHz |
50W/50µH + 5W
50/250 µH |
50 A
|
240 |
DC - 60HZ |
2 |
#4
|
2
|
01 & 09
|
| FCC-LISN-50/250-50-4 |
0.009-100MHz |
50W/50µH + 5W
50/250 µH |
50 A
|
240 |
DC - 60HZ |
4 |
#5
|
02, 17
|
01 & 09
|
| FCC-LISN-50/250-100-2 |
0.009-30MHz |
50W/50µH + 5W
50/250 µH |
100 A
|
240 |
DC - 60HZ |
2 |
#7
|
2
|
01 & 09
|
Request documentation
|
