
The following table shows some
Rs
values and their influence on the impedance measurement range:
Series Resistor Rs
Lower Z Limit
Upper Z Limit
200 Ω
5 mΩ
1125 Ω
450 Ω
10 mΩ
2250 Ω
499 Ω
11 mΩ
2480 Ω
950 Ω
20 mΩ
4500 Ω
The Shunt-Thru with series resistor configuration suffers from the same systematic error as
the normal Shunt-Thru configuration. Please refer to
details about the cable-braid-error.
Calibration
The Shunt-Thru with series resistor measurement requires at least one Thru calibration.
Thru calibration must be performed with the series resistors included.
For more details on calibrating a Shunt-Thru measurement, please refer to
Thru or Series-Thru measurement
7.4.5 Series-Thru
The Series-Thru measurement configuration is especially suitable to measure very high impedance
values. It is basically an S21 transmission measurement in a special configuration. The impedance is
calculated from the measured S21 parameter.
Measurement information
Bode 100
measures
S21
gain and calculates impedance
Z
using the equation:
The Series-Thru configuration offers high sensitivity for high-impedance DUTs. Impedance values in
the MΩ region can be measured. Using an output amplifier further increases the upper impedance
measurement limit.
Shunt-Thru measurement configuration is not suitable for low-impedance DUTs. It is not
recommended to measure impedance values below roughly 1 kΩ.
One advantage of the series-thru connection is that a shielded test-setup can easily be constructed.
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Содержание Bode 100
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