Instructions

Waveform Analysis
R&S
®
Scope Rider RTH
85User Manual 1326.1578.02 ─ 15
4.2.3.4 Area Measurements
Meas. type Symbol Description Graphic / formula Sources
Area Area
in Vs or
As
Area between the waveform and the x-
axis.
T
Eval
is the evaluation time, time of a full
waveform or limited by cursor lines.
-
+
-
Analog, math
4.2.3.5 Power Measurements
Power measurements require two sources, one voltage source and one current
source. They are not available for cursor measurements and logic channel sources.
Meas. type Symbol Description Graphic / formula Sources
Active power P
in W
Active or real power is the energy of the
system that can be used to do work.
Re
Q
S
φ
P
Im
2 sources:
analog, math
Apparent power S
in VA
Complex power S is the magnitude of
the vector sum of real and reactive
power.
Re
Q
φ
Im
S
P
2 sources:
analog, math
Reactive power Q
in var
Reactive power is temporally stored in a
system because of the inductive and
capacitive elements.
Re
Q
φ
Im
S
P
2 sources:
analog, math
Power factor PF
(no unit)
Power factor is a measure of the system
efficiency. The value varies between -1
and 1.
PF = cos(φ)
Re
Q
Im
S
P
φ
2 sources:
analog, math
4.2.3.6 PWM Measurements
Pulse width modulated signals are commonly used in power electronics. For drive con-
trol, the PWM signal contains a sinusoidal signal with a fundamental frequency f and
the associated RMS voltage, which an AC motor reacts on. The PWM measurements
of R&S RTH display the frequency and RMS value of this fundamental. This also works
Automatic Measurements