ETS-Lindgren 95252-1 Bulk Current Injection Probes (Archived) - Manual (Page 11)

BULK CURRENT INJECTION PROBES Conducted Emission
© ETS-Lindgren, L.P. – February 2005 7
Rev C – PN 399263
CONDUCTED EMISSION
TRANSFER IMPEDANCE (Z
T
)
The current injection probe may also be used as a sensor for
measuring conducted emission. The RF current ((I
P
) in
microamperes) in the conductor under test is determined from the
measuring receiver reading of the probe output (in microvolts (E
S
))
divided by the probe transfer impedance ((Z
T
) in ohms).
I
P
=E
S
/Z
T
Or in dB,
I
P
(dB
µA) = E
S
(dB
µV) – Z
T
(dB)
The transfer impedance is determined by passing a known RF
current (I
P
) through the primary test conductor and noting the
voltage (E
S
) developed across a 50 Ohm load on the probe output.
Z
T
= E
S
/I
P
Archived 6/1/10