3-9 50 MHz Calibrator VSWR Verification (All Models) Chapter 3 — Performance Verification
3-16 PN: 13000-00164 Rev. K ML248xx, ML249xA MM
19. Using the VSWR values from the previous step calculate the reflection coefficient, also known as Gamma
(Γ) for each of the resistance values, using the following formula:
Γ
100
= ______________ (should be a number near 0.33)
Γ
200
= ______________ (should be a number near 0)
Γ
300
= ______________ (should be a number near 0.2)
Γ
400
= ______________ (should be a number near 0.33)
20. For each of the resistance settings, connect the 8478B to the RF Calibrator of the DUT,
21. On the N432A, toggle the front panel Display button so that menu 2 of 2 is displayed.
22. Set the N432A to Display Voltages.
23. Press the “Voltages Display” button.
24. Note the measured values “V
1
” and “V
comp1”
as shown in Figure 3-7.
25. Change the N432A Bridge Resistance to 100 ohms as described in steps 5 and 6.
26. Ensure the RF Calibrator on the DUT is turned off.
27. Record the V
1
and V
comp1
values shown on the N432A into Table 3-4 as V
1
off and V
comp1
off.
28. Turn on the RF Calibrator on the DUT and allow the measurements to settle for approximately 10
seconds.
29. Record the V
1
and V
comp1
values on the N432A into Table 3-4, for V
1
on and V
comp1
on.
30. Turn off the RF Calibrator on the DUT.
31. When switching the RF Calibrator between On/Off and Off/On, allow the readings to settle for
approximately 10 seconds before recording the results.
32. Repeat step 25 through 31 with the N432A Bridge Resistance set to 200, 300 and 400 ohms.
Figure 3-7. V
1
and V
comp1
Values Shown on the N432A
Γ
VSWR 1–()
VSWR 1+()
---------------------------------=
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