Keysight Technologies 11644A K, User'S And Service Manual

Page: 48 / 72

5-12 X, P, and K 11644A
Performance Verification
System Operation Checks
872 x System Operation Check
1. Short the standard section and perform an S
11
and an S
22
measurement to verify that the ripple on the
reflection of the shorted waveguide section does not exceed the limits listed in the tables on page 5-15 .
If the ripple is less than the acceptable value, then the combination of directivity and source match
errors of the calibrated system is within the factory specified values.
2. Check the S
11
and S
22
of a thru measurement. As in the previous step, the results of this check contain
the directivity error, but, because of the thru connection to port 2, this measurement also checks the
limit of the combination of a number of error terms, including load match and transmission tracking.
3. Make an S
21
and an S
12
measurement. Ideally, the standard section is low loss. These measurements
verify that the combination of source match error and load match error do not cause excess ripple on
the trace. The trace ripple should not exceed the acceptable values listed in page 5-15 .
4. Record the results of each test in Table 5-4 through 5-6 .
The S
11
and S
22
of a Shorted Standard Section
1. Using a IF bandwidth of 10 Hz, perform a full 2-port calibration. (Refer to your network analyzer
documentation for specific instructions.)
2. Leave the calibration turned on.
3. Connect the standard section to port 1.
4. Connect the short to terminate the standard section.
5. Connect the load to port 2.
6. To set the display:
a. Press
[MEAS]
and select
Refl: FWD S11
.
b. Press
[SCALE REF] [.1] [x1]
.
c. Select
REFERENCE POSITION
and press
[10] [x1]
.
d. Select
REFERENCE VALUE
and press
[0] [x1]
.
e. Press
[MEAS]
and select
MEASURE RESTART
.
7. After one complete measurement sweep, the displayed trace should look similar to the typical corrected
trace shown in Figure 5-3 .
8. Use the markers to determine the greatest peak-to-peak deviation of the ripple on the displayed trace
(this is any positive peak to any adjacent negative peak):
a. Press
[MKR]
and select
delta MODE MENU
.
b. Set the reference to marker 2.
c. Switch between markers 1 and 2 (in the delta mode) and position them to the highest and lowest
peaks. (You may have to practice using the marker features to get the desired results.)