3-6 Directivity and Test Port Match Verification Chapter 3 — Performance Verification
3-14 PN: 10410-00730 Rev. D MN469xC Series Multiport Test Set MM
78. Position Mkr 2 to the bottom of the trough (or to the top of the peak if the ripple has the greatest position
peak.)
79. Sum the magnitude values of Mkr 1 and Mkr 3 at the peaks (or troughs) and divide the result by two.
This is the average value of the two peaks (or troughs) Refer to the example formula below:
Average Value = (Mkr 1 Mkr 2)/2 = (15.9634 dB) (15.641 dB)/2 = 15.8022 dB
80. Calculate the peak-to-peak ripple value (absolute difference of the Mkr 2 value and the Average Value) as
follows:
dB
p-p
= |Mkr 2 value| |Average Value| = 17.452 dB 15.8022 dB = 1.6498 dB
81. Use a RF measurement chart in Figure 3-7 on page 3-15 to find the corresponding return loss value of the
peak-to-peak ripple value.
• Example: The corresponding Return Loss value of 1.6498 dB
p-p
is approximately 20 dB
Figure 3-6. Log Mag Display
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