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Key Path
Atten units
Attenuation
Key Path
Channel Setup Menu
External scale....
External scale....
The External Scale function allows you to setup the analyzer to use external
optical-to-electrical converters or attenuators. Scaling is automatically
adjusted to account for the external device.
Channel, External scale....
The Atten Units function lets you select how you want the probe attenuation
factor represented. The choices are either decibel or ratio. The formula for
calculating decibels is:
The Attenuation function lets you select an attenuation that matches the
device connected to the analyzer. When the attenuation is set correctly, the
analyzer maintains the current scale factors if possible. All marker values and
voltage or wattage measurements will reflect the actual signal at the input to
the external device.
The attenuation range is from 0.0001:1 to 1,000,000:1. When you connect a
compatible active probe to the probe power connector, adjacent to the chan-
nel input, the instrument automatically sets the attenuation. For all other
devices, set the probe attenuation with the knob, arrow keys, or keypad.
Note
Refer to Chapter 3, "Calibration Overview" for information on calibrating to the tip of the
probe.
Channel, External scale...., Attenuation
2-16
Vout
Pout
20
log
----------- -
or10
log
----------- -
Vin
Pin
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