Agilent Technologies E7405A User Manual
84
Chapter 2
Making Complex Measurements
Making a Reflection Calibration Measurement
Making a Reflection Calibration Measurement
The calibration standard for reflection measurements is usually a short
circuit connected at the reference plane (the point at which the device
under test (DUT) will be connected.) See
circuit connected at the reference plane (the point at which the device
under test (DUT) will be connected.) See
. A short circuit
has a reflection coefficient of 1 (0 dB return loss). It reflects all incident
power and provides a convenient 0 dB reference.
power and provides a convenient 0 dB reference.
Figure 2-13
Reflection Measurement Short Calibration Test Setup
Example:
Measure the return loss of a filter. The following procedure makes a
reflection measurement using a coupler or directional bridge. This
example uses a 200 MHz bandpass filter as the DUT.
reflection measurement using a coupler or directional bridge. This
example uses a 200 MHz bandpass filter as the DUT.
NOTE
The analyzer center frequency and span for this measurement can
easily be set up using the transmission measurement setup in
easily be set up using the transmission measurement setup in
. Tune the analyzer so
that the passband of the filter comprises a majority of the display, then
proceed with the steps outlined below.
proceed with the steps outlined below.