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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
●
co m-p o wer. com
REV051917
4.4.2 Calibration-related
Calculations
The following sets of calculations are indispensible to the proper
application of the calibration process. These calculations apply only to
calibrations performed per the IEC 61000-4-6 standard. Please refer to
the IEC 61000-4-6 standard for further information.
4.4.2.1
Test Level Calculations
Prior to the start of the calibration process,
(U
mr
)
must be
calculated.
(U
mr
)
represents the voltage to be measured at the
output of the ADA-515-2 150
Ω
to 50
Ω
Adapter connected to
one side of the test fixture, and must not be confused with the
open circuit test level
(U
o
)
for the calibration (i.e.: 1 Vrms, 3
Vrms, 10 Vrms, etc.) The relationship between
(U
mr
)
and
(U
o
)
is
given below:
So, for instance, if calibration is being performed for a test level
of 10 Vrms:
Due to the fact that, in our example, there is a 30 dB attenuator
between the output of the 150
Ω
to 50
Ω
Adapter and the input
of the spectrum analyzer, the
(U
mr
)
value must also be
corrected for the attenuation.
NOTE:
Attenuators other than 30 dB may also be used, assuming
that any corrections will be adjusted accordingly.
U
U
mr
mr
=
U
o
6
(in linear quantities)
(in linear quantities)
U
mr
mr
=
U
o
(in logarithmic quantities)
(in logarithmic quantities)
- or -
- or -
- 15.6 dB
15.6 dB
Voltage at Output of 30 dB Attenuator
Connected to 150Ω to 50Ω Adapter
U
mr-30dB
mr-30dB
=
0.053 V
rms
dBμV
94.5
(U
mr-30dB
=
U
mr
- 30 dB)
U
U
o
=
10 V
rms
dBμV
140
Open Circuit Test Level
=
Voltage at Output of 150Ω to 50Ω Adapter
U
mr
mr
=
1.67 V
rms
dBμV
124.5
(U
mr
=
U
o
- 15.6 dB)
(U
mr
=
U
o
/ 6)
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