User guide

Operation

PRBS Generator 10 Gb/s User Guide

4.1.1 Performance Recommendations

Follow the following recommendations for best performance:

1. When using differential mode connection for OUT/OUT¯¯¯, ensure the

cables are phase balanced. If the electrical length of one cable is a

significant fraction of a unit interval longer than the other, the quality

of the differential signal will be degraded.

2. Keep cable lengths short and minimize number of cable bends.

3. When using a single port of differential output channel for single-

ended measurements, the complementary port must be terminated

with a 50 Ω termination.

4.1.2 Connector Care

The N4970A features high-quality SMA connectors for the front and rear

panel Input and Output, RF connections. Connector damage will degrade

signal fidelity.

Agilent Technologies also recommends the following:

• Use a 7 to 10 in-lbs torque wrench when attaching connectors.

•

Consider using connector savers to prolong performance and minimize

damage.

• Differential connectors may be used single-ended if second end

terminated in 50 Ω.

Inspect the connectors for the following:

• Worn or damaged threads

• Scratches to mating surface

• Burrs and loose metal particles

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.