ApplicationsMXO 4 Series
279User Manual 1335.5337.02 ─ 07
Result Unit Formula Description
Apparent power, |S| VA |S| = V
RMS
∙
I
RMS
(averaged over N cycles)
|S| is the magnitude of the
vector sum of active and
reactive power (the complex
power S).
Reactive power, Q VAR
(Volt‑Ampere
reactive)
Q = |S| sin
φ
Power flow that is temporally
stored in a system because of
the inductive and capacitive
elements.
Power factor, P
Factor
- P
Factor
= |P| / |S| Measure of the system effi-
ciency. The value varies
between -1 and 1.
Active power, P W P = V
INSTANTENEOUS
∙
I
INSTANTENEOUS
(averaged over N cycles)
Energy of the system that can
be used to do work.
Phase, φ °
φ
= acos (P
Factor
) Phase angle between the cur-
rent and the voltage sine
waves.
Reference level
For a description of the gate settings, see Chapter 11.2.3, "Reference level",
on page 285.
Gate
For a description of the gate settings, see Chapter 9.2.2, "Gate settings for measure-
ments", on page 221.
11.2.2.3 Power harmonics
Current harmonics appear in an electric power system due to nonlinear electric loads.
The harmonics can be ejected back into the AC line and disturb other equipment on
the grid. To avoid this disturbance, there are often standards of compliance that con-
sumer or industry end-products must meet.
The "Harmonics" analysis tests the devices according to the precompliance standards
EN 61000-3-2, MIL-STD-1399 and RTCA DO-160.
Required probes:
●
Differential voltage probe
●
Current probe
Configuring power harmonics
For details of the configuration settings, see "Power harmonic settings" on page 281.
1. Add a new power quality measurement as described in "To add a new power mea-
surement" on page 271.
2. In the "Analysis" tab, tap the "Harmonics" measurement.
Power analysis (option R&S
MXO4-K31)
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