Agilent Technologies FieldFox N9912A, User Manual

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124 N9912A FieldFox User’s Guide

Then
More
.

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
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.
How to set Relative and Offset Power Measurements

Press
Scale / Amptd
.

Then choose from the following:
o
Relative On Off
When switched to ON, the FieldFox measures and stores
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 %.
o
Offset On Off
Toggles ON and OFF the displayed power level using the
Offset value.
o
Offset Val
Value by which the power meter display is offset. A positive
value compensates for a component with loss. A negative value compensates
for a component with gain. Offset values are limited to +/- 100 dB.
Display Units
Select whether to display power in dBm or Watts. When making relative power
measurements, these change to dB and %.
How to set Power Meter display units

Press
Meas Setup 4
or
Scale / Amptd
.

Then
Unit
.

Then choose from the following:
o
dBm (dB)
Sets Power Meter display to dBm or dB.
o
Watt (%)
Sets Power Meter display to Watts or %.
Resolution
Resolution sets the number of digits to display after the decimal point on the
digital power meter display.