3-5
Making Time Domain Measurements
Making Transmission Response Measurements
Making Transmission Response Measurements In this example measurement there are three components of the transmission response:
• RF leakage at near zero time
• the main travel path through the device (1.6 µs travel time)
• the "triple travel" path (4.8 µs travel time)
This example procedure also shows you how time domain analysis allows you to
mathematically remove individual parts of the time domain response to see the effect of
potential design changes. This is accomplished by "gating" out the undesirable responses.
With the "gating" capability, the analyzer time domain allows you to perform "what if"
analysis by mathematically removing selected reflections and seeing the effect in the
frequency domain.
1. Connect the device as shown in Figure 3-2.
Figure 3-2 De vice Connections for Time Domain Transmission Example
Measurement
2. To choose the measurement parameters, press:
or on ET models:
3. Substitute a thru for the device under test and perform a frequency response correction.
Refer to Chapter 6 , “Calibrating for Increased Measurement Accuracy.”
4. Reconnect your device under test.
Preset
Meas
Trans: FWD S21 (B/R)
TRANSMISSN
Start 119 M/µ
Stop 149 M/µ
Scale Ref
AUTO SCALE