HP E4402B User Manual download pdf (Page 18)

18 Chapter 1

Installation and Setup

Running Internal Alignments

Each time the analyzer is powered on, the internal alignment routine runs automatically.

The analyzer was shipped from the factory with the Alignments mode set to

Auto,

Align All.

NOTE When the Alignment routine runs, you will hear the attenuator settings

changing, which generates noise. This is not an indication of trouble.

Manually Performing an Alignment

If the analyzer is an Agilent Technologies E4402B, E4403B, E4404B, E4405B, E4407B, or

E4408B, connect a BNC cable from the AMPTD REF OUT to INPUT 50

Ω using an

adapter. After a 5 minute warm-up, press

System, Alignments, Align Now, All.

NOTE It is normal to hear clicking when the Auto Alignment function is on. During

the interval between sweeps, portions of the analyzer’s circuitry are

realigned. Some of the circuitry is controlled by relays. It is the rapid

switching of these relays between sweeps which causes the clicking sound.

Under normal operation, these relays will last over 50 years.

To eliminate the clicking sound, turn off the automatic alignment. (See the

Alignments key description in your User’s guide.”) With

Auto Align turned off,

however, the Align Now All function should be performed periodically. For

more information on how often to perform Align Now All when the Auto

Alignment function is off, refer to the appropriate “Specifications and

Characteristics” chapter in your specifications guide.

Auto Align, Off is selected, refer to the Specifications guide for the conditions required to

maintain calibration.

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HP E4402B User Manual Page 18