Units
The Portable One Plus Access supports a full set of industry-standard
units.
Amplitude units
.
V (Volts) – Basic unit of amplitude
.
Vp – Peak voltage
.
dB – Relative decibels of two voltage measurements; depends
on measurement function
.
dBV – Decibels relative to 1.000 Volt
.
dBu – Decibels relative to 0.7746 Volt
.
dBr – Decibels relative to user-settable voltage value (gain or
loss)
.
dBg – Decibels relative to present generator amplitude
.
% - Relative percentage of two voltage measurements; depends
on measurement function
.
X/Y – Pure number resulting from dividing one voltage by
another
The amplitude units are available when measuring an analog
amplitude with a voltmeter and when setting generator amplitude. V
(Volts) is the most common, and is measured in RMS unless another
detector is specified. Vp is the peak instantaneous voltage reached by
the waveform each cycle. For a sine wave (the only waveform for
which Vp is supported), the value of Vp is 1.414 times V.
All of the dB-based units use decibel calculations. The decibel is a
relative unit, which means that a reference is always required. If a
reading is 0 dB, then the measured amplitude is the same as the
reference amplitude. If the reading is positive dB, then the measured
amplitude is larger than the reference amplitude. If the reading is
negative dB, then the measured amplitude is smaller than the
reference amplitude.
The decibel reading is calculated from the measured amplitude using
the following formula:
where V is the measured amplitude and Vr is the reference amplitude.
dB
V
Vr
=•
F
H
I
K
20 log
& For a Quick
Reference to
Units, see
Appendix A.
4
Operation
Units : Amplitude units Operation
Portable One Plus Access User's Manual 4-71
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