HP HP 8753E, User Manual, Page: 410 / 699

6-10. Time Domain Reflection Formats
Format
MAG Reflection Coefficient (0 1)
Reflection (unitless) (- 1 1)
Standing Wave Ratio (unitless)
Transmission Measurements Using Mode
The mode can also transform transmission measurements to the time domain. For
example, this mode can provide information about a surface acoustic wave (SAW) filter that
is not apparent in the frequency domain. Figure 6-64 illustrates a time domain
measurement of a 321 MHz SAW
Figure 6-64. Transmission Measurement in Time Domain Mode
Interpreting the transmission response horizontal axis. In time domain
transmission measurements, the horizontal axis is displayed in units of time. The time axis
indicates the propagation delay through the device. Note that in time domain transmission
measurements, the value displayed is the actual delay (not The marker provides the
propagation delay in both time and distance.
Marker 2 in Figure 6-63 (left) indicates the main path response through the test device, which
has a propagation delay of 655.6 ns, or about 196.5 meters in electrical length. Marker 4 in
Figure 6-63 (right) indicates the triple-travel path response at 1.91 or about 573.5 meters.
The response at marker 1 (at 0 seconds) is an RF leakage path. In addition to the
triple travel path response, there are several other multi-path responses through the test
device, which are inherent in the design of a SAW
Interpreting the transmission response vertical
axis. In the log magnitude
format, the vertical axis displays the transmission loss or gain in
in the linear magnitude
format it displays the transmission coefficient Think of this as an average of the
transmission response over the measurement frequency range.
Application and 6-126