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Using the Attenuator
Setting Up the Attenuation
Resetting the Attenuation Factor
To reset the attenuation factor, press and hold A
TT until the value
resets (this takes approximately two seconds). The attenuation
factor resets so that the filter attenuation is zero, that is
Att(dB) = Cal(dB)
Entering a Calibration Factor
The calibration factor is shown at the bottom left of the display
Figure 2-3 The Calibration Factor on the Display
This factor does not affect the filter attenuation. It is used to offset
the values for the attenuation factor.
There are two ways of entering the calibration factor.
• by editing, and
• by transferring
Editing the Calibration Factor
You would use this, for example, to enter an offset to compensate
for the insertion loss (attenuation) of your hardware setup.
The filter attenuation stays constant while you edit the calibration
factor. This means that the attenuation factor, shown on the display,
changes according to the formula below (from equation (1)):
Att
NEW
(dB) = Att
filter
(dB) + Cal
NEW
(dB) = Att
OLD
(dB) -Cal
OLD
(dB) + Cal
NEW
(dB)
To edit an external calibration factor,