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Key Function Descriptions
Key Descriptions
W
X
+
−
ANNOT ON OFF
ATTEN AUTO MAN
Maximum input signal amplitude is +30 dBm with at least 10 dB of
CAUTION
input attenuation. Higher amplitude signals can result in damage to
the input attenuator or to the input mixer.
AUTO COUPLE
218
Amplitude correction (ampcor) is on
10 MHz reference is external
External mixer bias is greater than 0 mA
External mixer bias is less than 0 mA
Front-panel key access:
Blanks the annotation from the display (OFF) or
reactivates it (ON).
Front-panel key access:
Available with internal mixing only.
Adjusts the spectrum analyzer input attenuator. In
AUTO mode, the input attenuator is coupled to the
reference level. In manual (MAN) mode, the input
attenuation can be adjusted using the data keys, the
step keys, or the knob. The attenuator ranges from 0 dB
to 70 dB in 10 dB increments (0 dB to 60 dB range for
the Agilent 8564E/EC and Agilent 8565E/EC). 0 dB
attenuation can only be selected using the data keys.
Attenuation is normally a coupled function and is
automatically adjusted when the reference level
changes. The reference level generally does not change
when the attenuation changes. The attenuator is
adjusted so that the maximum signal amplitude at the
input mixer is −10 dBm or less. For example, if the
reference level is +23 dBm, the attenuation is 40 dB for
an input of −17 dBm at the mixer (23 − 40 = −17). This
prevents signal compression. To adjust the input
attenuator set ATTEN AUTO MAN to MAN. A line
under AUTO or MAN indicates whether the attenuator
is coupled (AUTO) or in manual mode (MAN). When
the input attenuator is in manual mode, pressing
ATTEN AUTO MAN again recouples the attenuator to
the reference level.
Front-panel key access:
Accesses a menu of coupled-mode functions, as follows:
ALL, RES BW AUTO MAN, VIDEO BW AUTO MAN,
SWP TIME AUTO MAN, ATTEN AUTO MAN, CF
STEP AUTO MAN, and UNITS AUTO MAN.
DISPLAY
DISPLAY
or
AMPLITUDE
AUTO COUPLE
Chapter 4
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