Chapter 4 63
Making SRL Measurements
How to Make SRL Measurements
Figure 4-1 Calibrate the Instrument for an SRL Measurement
Verifying the Calibration
After calibrating, it is important to verify that the calibration is good. Always
determine your system directivity and verify the quality of your test lead cable after
performing a calibration.
When verifying the calibration and the quality of your test lead cable, you should
look for a combination of good system directivity (<-50 dB, but acceptable up to -40
dB) and small variations in peak amplitudes (<10 dB) when the test lead cable is
wiggled or moved.
Determine System Directivity.
1. Determine the system directivity by connecting the load standard to the end of
the test lead cable as shown in
Figure 4-2. (Or, if your reference plane is the
analyzer's RF OUT (or PORT 1) test port, connect the load directly to that front
panel connector.)
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