For the dBV and dBu units, the reference is a predefined value. For
the dBr unit, the reference is specified by the user. For the dBg unit,
the reference is always the current generator amplitude. For the dB
unit, the reference is another measured amplitude, which depends
upon the measurement function.
There are two ways to set the reference value for the dBr unit. The
first is to press the dBr ZERO button, located near the top right corner
ofthe display. This will set the dBr reference value to the current
amplitude ofthe main measurement (shown in the top left section of
the display). The second way is to go to the Analyzer Only panel (by
pressing INSTRUMENT MODE PANELS several times) and then select
the dBr unit for the main measurement. The current value of the 0
dBr (the reference value) will be shown across the center of the
display, and it may be changed using the AMPLITUDE controls.
The dB unit is available in Ratio, THD+N, and SINAD measurement
functions. All of these modes have an implied reference for the main
measurement, which is the secondary measurement shown in the
upper center of the display. This is the reference value used for the dB
calculation.
The % unit can be used for amplitude or frequency measurements.
The % unit for amplitude is available in THD+N and SINAD
measurement functions. It also uses the secondary measurement,
shown in the upper center of the display, for a reference. It calculates
what percent the main measurement is ofthe secondary measurement.
The X/Y unit is available only in Ratio mode. The reading is a raw
result ofdividing one amplitude reading by another. This is usually
used for gain or attenuation through a device.
&
For more
information on
moving among
the panels, see
page 4-1.
4
Oper
ati
o
n
Operation
Units : Amplitude units
4-72
Portable One Plus Access User's Manual
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