Agilent Technologies FieldFox N9913A User Manual page 137

How to Scale the Power Meter display
Manually:
 Press Scale / Amptd .
 Then choose from the following:
Autoscale:
Using Autoscale, the current reading is used for the center of the scale, and Min
and Max values are set accordingly.
 Press Scale / Amptd .
 Then
 Then Autoscale.
Relative and Offset Power Measurements
Power measurements can be made that are relative to another reading or that are
offset by a fixed value.
 Use Relative to measure the difference between power levels.
 Use Offset to account for components or a long length of cable that is used
How to set Relative and Offset Power Measurements
 Press Scale / Amptd .
 Then choose from the following:
Power Meter Mode
Scale Min
Sets the low power level of the power meter display. Type a
o
number and select the units or press Enter. This value is limited to –100
dBm.
Scale Max
Sets the high power level of the power meter display. Type a
o
number and select the units or press Enter. This value is limited to 100
dBm.
More
.
before the power sensor. For example, if using a 10 dB attenuator to protect
the FieldFox, enter an Offset Value of 10 to read the power as it would appear
without attenuation. If using a 10 dB amplifier, enter an Offset Value of –10 to
read the power as it would appear without amplification.
Relative On Off
When switched to ON, the FieldFox measures and stores
o
the current power level. Subsequent power measurements display a power
level which is relative to the stored value. When relative is ON, the units
change from dBm to dB or from Watts to %.
Offset On Off
Toggles ON and OFF the displayed power level using the
o
Offset value.
Offset Val
Value by which the power meter display is offset. A positive
o
value compensates for a component with loss. A negative value compensates
for a component with gain. Offset values are limited to +/- 100 dB.
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