Multi-Channel BERT 12.5 Gb/s User Guide
19
data output. The channel ID LED of the N4955A-P12/N4955A-D12 should
come on.
8.
Set up the clock source as follows: Frequency 10 GHz, Output Level
0 dBm.
9.
On the keypad, press the number 1 to view the STAT (Status) menu settings
for the N4956A-E12 connected to channel 1.
10.
Position the arrow next to the Sync label on the N4965A then press the
softkey corresponding to the Align label. This will turn on the auto alignment.
11.
Position the arrow next to the BER label on the N4965A then press the
softkey corresponding to the RUN label. MEAS 000 000 should appear
above BER and start counting. The BER and Errs should read 0.000e0.
1.14
Connector Care
The system features high-quality SMA and 2.92 mm connectors for the front panel
input and output connections. Connector damage will degrade signal fidelity.
Refer to the N4960-90030 N495xA through N498xA Connector Care Reference Guide
at www.keysight.com/find/N4955A.
Excessive mating of low quality SMA connectors to 2.92 mm female connectors
may degrade the 2.92 mm female receptacle.
Inspect the connectors for the following:
Worn or damaged threads
Scratches to mating surface
Burrs and loose metal particles
Ensure that female contacts are straight and aligned
Clean the connectors as described in the following procedure. Cleaning connectors
with alcohol shall only be done with the instruments power cord removed, and in a
well-ventilated area. Allow all residual alcohol moisture to evaporate, and the fumes
to dissipate prior to energizing the instrument.
1.
Remove any loose particles using a low-pressure air source.
2.
Moisten a lint-free swab with isopropyl alcohol. Do not saturate the swab.
3.
Minimize the wicking of the alcohol into the connector structure.
4.
Clean the mating plane surfaces and threads.
5.
Allow alcohol to evaporate, and then use a low-pressure air source to blow
surfaces clean.
6.
Make sure no particles or residue remains.
Inspect connector for damage.
1.15
Returning the N4965A to Keysight Technologies
If the N4965A fails system verification and you cannot correct the problem, return the
N4965A to Keysight Technologies for repair following the steps shown below.
Summary of Contents for N4965A
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