6-46
Calibrating for Increased Measurement Accuracy
Calibrating for Noninsertable Devices
first be found. The adapter match will degrade the effective load match terms on both ports as well as
degrade the transmission frequency response (tracking).
1. Refer to Figure 6-19 while performing the steps in this procedure. Also refer to page 6-41 for an
explanation of A1, A2, and A3.
2. Perform a 1-port calibration at “Reference Port 1”. Refer to Step A of Figure 6-19.
Figure 6-19 Determining the Electrical Delay Setup
3. Connect the A3 adapter to “Reference Port 1” as shown in Step B of Figure 6-19. Connect a short to the
open end of the A3 adapter.
4. Measure the delay of the adapter by pressing .
5. Divide the resulting delay measurement by 2 to determine the delay of the thru and the short in one
direction.
6. Determine the offset delay of the calibration short by examining the define standard menu (see "Define
Standard Menus" on page 7-59).
7. Subtract the offset delay of the short (determined in step 6) from the delay of the thru and the short in
one direction (determined in step 5). The result is electrical delay of the thru. This value is used in the
next step.
8. Modify the calibration kit thru definition by entering in the electrical delay of adapter A3. Save this as a
user kit. For example, if A3 has 100 ps of delay, press:
9. Perform the desired calibration with this new user kit.
10. Connect the test device as shown in Figure 6-17 and measure the device.
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