Keysight Technologies N5247B Service Manual page 71

Tests and Adjustments
Performance Tests
4. A2 is set to 20 dB and the analyzer's receiver power level is measured. This
is the analyzer reference reading, Par.
5. A1 is changed to 5 dB and 10 dB. At each point, delta power levels are
read on the power meter, Pmd, and the analyzer, Pad.
6. The power linearity error at each point is calculated as Pe = (Pmr – Pmd) –
(Par – Pad).
7. A2 is set to 30 dB, A1 is set to 0 dB, and the analyzer's source power is
adjusted until the receiver power level is exactly the same as it was before
the attenuators were switched.
8. New power meter and analyzer receiver reference readings are recorded.
The process is repeated until the total attenuation reaches 120 dB.
9. The process is reset to the 20 dB reference level and it is run in reverse
until the total attenuation reaches 0 dB.
If the Analyzer Fails this Test:
— If the analyzer fails this test, rerun the test.
— If the analyzer fails this test repeatedly, replace the A23 mixer brick for a
Port 1 or Port 2 failure or the A24 mixer brick for a Port 3 or Port 4 failure,
then repeat this test. Refer to
Mixer Bricks" on page
— If the analyzer still fails this test, replace the A12 SPAM board and repeat
this test. Refer to
page
Dynamic Accuracy Test – Version 2
This description applies to all N522xB, N5231B/32B/34B/35B/39B, and
N5247B instruments. It also applies to N5241B/42B/44B/45B instruments
with serial numbers greater than xx5240xxxx. It also applies to
N5241B/42B/44B/45B instruments with serial numbers less than xx5240xxxx.
For all other instruments, see test
page 3-40
Option 205/220/420/425)" on page
Function of the Test: To measure the relative power linearity of the analyzer's
receivers.
Specification Tested: Test Port Input–Dynamic Accuracy
Equipment Used:
— U3020AD01 dynamic accuracy test set
— Signal generator
— Power meter
— Power sensor
Keysight N5247B Service Guide
7-41.
"Removing and Replacing the A4–A17 Boards" on
7-18.
or "Dynamic Accuracy at Low Frequency (Available with LFE
"Removing and Replacing the A27 and A28
"Dynamic Accuracy Test – Version 1" on
3-43.
3-41