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AT Attenuation
AT
Attenuation
Specifies the RF input attenuation.
Syntax
/-
attenuation
Item
Description/Default Range
Number
Any real or integer. Default units are
dB.
Input attenuator
range of spectrum
analvzer.
Equivalent Softkey:
ATTI$?J
AUTO #AM is similar.
Preset State: 10
dB.
Step Increment: in 10
dB
steps.
Related Commands: AUTO, ML, RL.
Example
OUTPUT 7 18
;
“AT 40DB
;
”
Sets the attenuation to 40 dR
OUTPUT 7 18
;
“AT UP
;
”
Increases
the attenuation to 50 dR
Description
The AT command specifies the input attenuation in 10
dB
steps. Normally, the input attenuator
is coupled to the reference level. When a continuous wave signal is displayed with its peak at
or below the reference level, the coupling keeps the mixer input level at or below the specified
level (also see the command “ML”). The AT command allows less than the specified value at the
mixer input.
When the attenuation is increased with the AT command, the reference level does not change.
If the attenuation is decreased from the coupled value using the AT command, the reference
level will be decreased. When the reference level is changed using the RL command, the
input attenuation changes to maintain a constant signal level on the screen if attenuation is
auto-coupled. Using auto-coupling resets the attenuation value so that a continuous wave
signal displayed at the reference level yields -10
dBm
(or the specified mixer level) at the
mixer input.
The step keys, knob, and DN parameter do not allow an attenuation entry below 10
dB.
Only
direct entry of “AT ODB;” will achieve 0
dB
attenuation.
Programming Commands 5-69