Return Loss Measurement Return Loss Measurement
156 Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition
Set Averaging Time 5 Move to the [AvgTime] parameter (the measurement averaging
time). Make sure that the selected averaging time is suitable for your
measurements.
Use an averaging time of at least 200 ms, but increase this to at least
1 s for return losses greater than 50 dB. Longer averaging times give
more accurate results, but reduce the speed at which the
instrument can complete a measurement.
Figure 89 Agilent 8161x Details Screen
Set Wavelength 6 Move to [λ] and either:
– set this parameter to Extern.
– choose an internal source by selecting its wavelength
(Agilent 81611A/2A/3A/4A Return Loss modules only).
7 Enable the source.
T-Value
The T-Value field shown in Figure 89 is the termination calibration
value. This represents the quality of the return loss measurement
when the ratio between the parasitic and reference power levels is
large enough.
This is calculated as follows:
Where:
T Value–10P
ref
P
para
⁄()log M
para
M
ref
⁄()⋅⋅RL
ref
+=
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