Chapter 1 1-9
Preparing for Use
Turning On the Analyzer for the First Time
NOTE Record the firmware revision number and keep it for reference. If you
should ever need to call Agilent Technologies for service or with any
questions regarding your analyzer, it will be helpful to have the
firmware revision number readily available. You can also obtain the
firmware revision number by pressing
System, More 1 of 3, Show
System.
To ensure your analyzer meets specifications, it must meet operating
temperature conditions. Allow a 5 minute warm-up before making
calibrated measurements.
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 Chapter 6 ,“Front-Panel Key
Reference.”) With
Auto Align turned off, however, the Align Now All
function should be performed periodically. For more information on how
often to performAlign Now All when the Auto Alignment function is off,
refer to the appropriate “Specifications and Characteristics” chapter in
the Agilent Technologies ESA Spectrum Analyzer Specifications Guide.
CAUTION When operating in DC coupled mode on spectrum analyzers with
Option UKB, ensure protection of the input mixer by limiting the input
level to 0 VDC, +30 dBm.
If you wish to use an external 10 MHz source as the reference
frequency, connect an external reference source to the
10 MHz REF IN
connector on the rear panel. The signal level should be greater than
–15 dBm.
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