Interpreting Measurement Results
To ensure high quality measurements, it is important to make some trial
measurements and examine them before collecting data.
After setting up the structure, you should look at the time domain signals. The
input range settings should be set at no more than two times the maximum
signal level. This is known as half-ranging. See figure 2-2.
Figure 2-2.
InputHalfRanging
When the response input level is very low relative to the analyzer, noise
appears between the peaks in the frequency response. This results in a poor
coherence function. See figure 2-3. This is called under-ranging.
Figure 2-3.
Input Under Ranging
Agilent 35670A
Measuring Structures Operator's Guide
2-4
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