Now let’s perform a reflection measurement on a 20 dB attenuator
over the 1 to 18 GHz range.
We need to determine the setup, calibration, and measurement re-
quirements.
A known good starting point is to reset with Default Program parame-
ters. Since our measurement lies between 1 and 18 GHz, set the Start
and Stop frequencies using the Sweep Setup menu that appears on the
display following system reset.
Let’s perform a simple Reflection Only calibration, which uses an open,
a short, and a broadband load. To do this, press the Begin Cal key and
follow the directions in the menu area.
When you complete the calibration, the “CHANNEL 1 WITH S11”
Smith chart appears on the display. Now:
1. Select the Log Magnitude display and install the attenuator.
2. Select Auto Scale to optimize the display data.
3. Use Markers 1 and 2 to find the maximum and minimum imped-
ance.
TRANSMISSION AND REFLECTION MEASUREMENTS