Agilent Technologies FieldFox N9912A User Manual page 110

 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:
Display Units
Sets the Power Meter display to 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
 Then choose from the following:
Resolution
Sets the number of digits to display after the decimal point on the digital power
meter display.
110
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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.
When switched to ON, the FieldFox measures and stores
Relative On Off
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.
.
Unit
Sets Power Meter display to dBm or dB.
dBm (dB)
o
Watt (%) Sets Power Meter display to Watts or %.
o
N9912A FieldFox User's Guide