Specifications

1-2 Chapter 1
Overview
Description
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Description
The Agilent Technologies E444xA Option H26 consists of a high band preamp with a
nominal gain of 27 dB at the front end of the spectrum analyzer. The performance and ease
of use come from the high gain of the preamplifier, the ability to switch the preamp in and
out and the use of the instruments flatness correction tables to reduce the amplitude
errors.
The preamp has a frequency range from 3 GHz to the upper frequency limit of the
analyzer. Refer to Table 1-1. The preamp can be enabled or disabled via remote SCPI
commands or from the front panel interface. The lowband preamp (Option 1DS) operates
below 3 GHz and the highband preamp (Option H26) operates above 3 GHz.
NOTE All instrument specifications are considered to be NOMINAL values of
performance when the highband preamp is engaged. For example,
specifications for absolute amplitude accuracy are now NOMINAL in
performance and may still be useful but are not specified.
CAUTION Excessive Relay Switch wear can occur if the instrument is sweeping
from below 2.85 GHz and the Stop Frequency is above 3.05 GHz.
CAUTION The Damage Level is reduced to +20 dBm when the Option H26 is
enabled.
Flatness characteristics of the preamp will be stored in the User memory file titled “Other.”
This can be used to compensate for the variations in amplitude of the High Band PreAmp.
Refer to “Accessing the Flatness Compensation Table” on page 3-5.
When not using the highband preamp, displayed average noise level may still be degraded
due to the extra length of cable in the option. Refer to “Displayed Average Noise Level
(Preamp Off)” on page 1-7.
Table 1-1 Preamp frequency range
Model Preamp Frequency range
E4440A 3 GHz to 26.5 GHz
E4443A 3 GHz to 6.7 GHz
E4445A 3 GHz to 13.2 GHz
E4446A 3 GHz to 44 GHz
E4448A 3 GHz to 50 GHz