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Key Path
Key Path
External scale....
The External scale softkey allows you to set up the analyzer to use external opti-
cal-to-electrical converters or attenuators. Scaling is automatically adjusted to
account for the external device.
Channel, External scale....
Atten units
The Atten units function lets you select how you want the probe attenuation
factor represented. The choices are decibel or ratio. The formula for calculat-
ing decibels is:
Attenuation
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 exter-
nal 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
Vout
Pout
20
log
----------- -
or10
log
----------- -
Vin
Pin
Channel Setup Menu
External scale....
2-9
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