456 Keysight N9927-90001 User’s Guide
Power Meter (USB) Mode - Option 302
USB Power Meter Settings
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:
— Relative Off On
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 %.
— Offset Off On
Toggles ON and OFF the displayed power level using
the Offset value.
— 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, More
—Then Unit.
— Then choose from the following:
— dBm (dB)
Sets Power Meter display to dBm or dB.
— 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.
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