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INSTRUCTION MANUAL
CLCI-100
BULK CURRENT INJECTION PROBE
with
FCLC-100
CALIBRATION FIXTURE
1912 1 E l T o ro R d
●
Si l vera do, Ca lifo rni a 9 26 76
●
(9 49) 459 -96 00
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co m-p o wer. com
REV051917
4.3 Transfer Impedance Factors
When performing current measurements, the conductor(s) under test are passed
through the aperture of the current probe. The RF port of the current probe is
connected to the 50 ohm RF input of a spectrum analyzer or EMI receiver, where
a voltage value is measured.
The transfer impedance factor includes the loss of the probe (see section 4.2),
and also converts the measured voltage value to a current value corresponding
to the current flowing on the conductor(s) under test.
Illustrated in Figure 8 is a diagram of the equivalent calibration circuit, along with
the associated calculations.
FIGURE 8 -
Equivalent Schematic of Calibration Circuit
50Ω
V
1
I
P
CLCI-100
Bulk Current Injection Probe
10 kHz to 100 MHz
Max Input: 100 Watts (CW)
www.com-power.com
CAUTION
Hazardous voltages present
during operation. Do not handle
probe while test is in progress.
V
2
50Ω
50Ω
Z
T
= Transfer Impedance (in dB
= Transfer Impedance (in dBΩ)
Ω)
V
1
= RF voltage on the coaxial line (in dBμV)
= RF voltage on the coaxial line (in dBμV)
V
2
= RF output voltage of the probe in (in dBμV)
= RF output voltage of the probe in (in dBμV)
I
P
= measured current (in dBμA)
= measured current (in dBμA)
34
34 = dB ratio between voltage and current in a 50
= dB ratio between voltage and current in a 50Ω system
Ω system
= 20*log(50Ω)
= 20*log(50Ω)
where:
where:
Z
T
V
2
I
P
=
-
L
ins
ins
= Insertion Loss/Coupling Loss (in dB)
= Insertion Loss/Coupling Loss (in dB)
34
34
L
ins
ins
Z
T
=
+
V
1
V
2
L
ins
ins
=
-
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