10.2.1 Calibrating a Transmission (S21) measurement
This section shows how to calibrate a Gain, Transmission or S21 measurement performed in the
Transmission / Reflection measurement mode.
The Transmission / Reflection mode offers the possibility to measure Transmission and
Reflection sequentially.
Note: The gain or Thru calibration is only applied to the gain measurement. If you want to
calibrate the Impedance, Reflection or Admittance measurement, refer to 10.3.1 Calibrating
a Reflection or One-Port measurement (see page 94).
In the Transmission / Reflection measurement mode Channel 1 is not in use by default. Receiver 1 is
connected internally to the signal source through the internal reference. The Channel 2 termination is
set to 50 Ω, therefore by default the Gain result equals the transmission S-parameter S21 from the
OUTPUT port to the CH2 port. If you choose to measure with the External reference connection,
please refer to 10.2.2 Calibrating a Gain/Phase measurement on page 89.
The following picture shows a typical transmission calibration setup. The DUT is replaced by a Thru-
connector.
Figure 10-1: Gain, respectively Thru calibration setup in a transmission measurement.
The factory calibration of Bode 100 moves the reference plane exactly between two cables
of 0.5 m length. So you can measure S21 using the delivered cables having a well calibrated
test-setup.
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OMICRON Lab
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