User Manual

Application examples
Figure 44: Custom limits setup
To set custom limits, either right-click the desired measurement parameter or
click the Limits Setup icon on the menu bar. Stop the measurement update to
set up custom limits.
Custom limits will appear as a separate tab on the measurement grid. The
result column will display red fonts if the limits are failing. Hovering over the
results will display the limit function, limit value, and relative value.
Exam
ple 2: Efficiency testing three phase applications
Applications such as motor drives, wind power turbines, and other large loads rely
on three phase power delivery to make the system more efficient and economica l.
Thi
s example discusses how the PA3000 can help with three phase efficiency
measurements. The example applies to various three phase AC-DC, DC-AC
Inverters, and AC-AC converter applications such as PWM motor drive, three
phase inverters, three phase UPS systems, and wind power.
Measurement challenge
Measurements on a three phase application can be complex due to floating high
power signals and complex power calculations that can be prone to errors. Ideally
the three phases should be symmetric with balanced phases, but in most real
world applications there is always some imbalance due to inconsistencies in the
load impedance, cabling, and other system aspects. It is important to have highly
accurate isolated measurements with good phase accuracy and synchronization
between the measurement channels.
112 PA3000 Power Analyzer User Manual