8
KEMA 801A
4. VERIFICATION OF THE INSERTION LOSS
The insertion loss is measured in a 50 Ω system with CAL KEMZ, 10 dB attenuators, network analyzer and
cables. In a first step the measuring set-up is normalized with two connected impedance measurement adapt
-
ers and 10 dB attenuators as shown in the figure below. The RF matching is improved by the 10 dB attenuators.
Figure 2: Normalization set-up
The insertion loss measurement is performed with the clamp clipped on a 4 mm tube which is connected to
impedance measurement adapters. The clamp is positioned in the centre between both impedance measuring
adapters. Place the 4 mm tube in the centre of the ferrite cores. The measuring set-up is shown in the figure
below.
Figure 3: Set-up for measuring the insertion loss
2x 10 dB attenuator
RF OUT 50 Ω
RF IN 50 Ω
NETWORK ANALYZER
USB
USB
Power
Tuning
Back
0
.
1
4
7
8
5
2
3
kHz
dBm
6
9
MHz
dBµV
Hz
V
Enter
StSize
StSize
StSize
Step
1
Step
2
Step
3
DIA
MEAS
FOR
DIS
SCL
TRA
STO
FRQ
LVL
RCL
MOD
MOD
STO
CH 1
CH 2
RCL
STO
FRQ
LVL
RCL
MOD
MOD
Stop
Run
Hold
STO
FRQ
LVL
RCL
MOD
MOD
Local
2nd
Help
RF
ON/OFF
Ground plane
SAR M116
2x Impedance
measuring adapter
Reference ground plane
4 mm tube
10 dB attenuator
RF OUT 50 Ω
RF IN 50 Ω
NETWORK ANALYZER
USB
USB
Power
Tuning
Back
0
.
1
4
7
8
5
2
3
kHz
dBm
6
9
MHz
dBµV
Hz
V
Enter
StSize
StSize
StSize
Step
1
Step
2
Step
3
DIA
MEAS
FOR
DIS
SCL
TRA
STO
FRQ
LVL
RCL
MOD
MOD
STO
CH 1
CH 2
RCL
STO
FRQ
LVL
RCL
MOD
MOD
Stop
Run
Hold
STO
FRQ
LVL
RCL
MOD
MOD
Local
2nd
Help
RF
ON/OFF
KEMA 801A
150 kHz ... 1000 MHz
RF ATTENUATION CLAMP
KEMA 801A
10 dB attenuator Impedance
measuring adapter
Impedance
measuring adapter