Agilent Technologies N4962A Uživatelská příručka stáhnout pdf (Strana 34)

Operation

Serial BERT 12.5 Gb/s User Guide

4.1.1 Performance Recommendations

Follow the following recommendations for best performance:

• When using differential mode connection for IN/IN¯¯, OUT/OUT¯¯¯, or

DataThru/DataThru¯¯¯¯¯¯ , 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 and BER will increase.

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

• Terminate all unused RF connectors with 50 Ω terminations.

4.1.2 Connector Care

The N4962A serial BERT 12.5 Gb/s features high-quality SMA connectors, and

two 2.92 mm K-connectors for the front-panel OUT/OUT¯¯¯ interface. Agilent

Technologies does not recommend using male SMA connectors with the

female K-connectors; the male SMA pin has looser tolerances than the female

K sleeve, and may damage the connector. Connector damage will degrade

signal fidelity.

Refer to the N4960-90030 N495xA through N498xA Connector Care Reference

Guide at www.agilent.com/find/N4962A

Agilent Technologies also recommends the following:

• Use a 7-10 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.

• Terminate all unused RF connectors with 50 Ω terminations.

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Agilent Technologies N4962A Uživatelská příručka Strana 34