Advanced Measurements [3Pi Controller Only] - California Instruments MX30-1 User Manual

User Manual – Rev AJ
4.5.3 Accuracy Considerations
Any measurement system has a finite accuracy specification. Measurement specifications are
listed in Section 2. When using the AC source for measurement purposes, always consider
these specifications when interpreting results. Measurement inaccuracies become more
pronounced as the signal being measured is at the low end of the measurement range. This is
particularly relevant for low current measurements. The MX Series is a high power AC and DC
source optimized for providing and measuring high load currents. When powering low powe
loads, mea surement inaccuracies on rms and peak current measurements will greatly affect
derived measurements such as power, power factor and crest factor.
The measuremen
bandwidth in three-phase mode. The MX Series uses 16 kHz. This means th
components of the measured signal are filtered out. Any contribution to the rms value of voltage
and current above this cutoff frequency will not be reflected in the MX Series measurements.
When using an external measur
readings.
4.6 Advanced Measurements
The 3Pi controller offers advanced power analyzer measurement capabilities. These functions
may be accessed from the MEAS button or the MENU 2 screen. The phase for which the
analysis or waveform acquisition is done may be selected using the PHASE key in three phase
configurations. This chapter cov
functions.
4.6.1 Harmonic Analysis
The 3Pi controller's power analy
and current on each available ph
LCD display in a tabular as well as a graphical mode.
4.6.1.1 Acquiring FFT data
To perform an FFT analysis on the output of the AC source, proceed as follows:
1. Press the MEAS button four times or until the HARMONICS/TRACE ANALYSIS screen
appears.
2. Move the cursor to the FUN
will default to CURR as only
3 . Move the cursor to the VIEW
display mode does not apply
4. Move the cursor to the DAT
will show all harmonic components in volts or amps. Relative display mode will use the
fundamental as a 100 % ref
fundamental. Phase angles
The phase angle of the fund
5. Skip the SCALE field as it o
6. Move the cursor to the TRIG
acquire the data once and show the result. If you select CONT, the data will be updated
continuously.
128
t system on the MX Series I uses a data acquisition system with a 6.6 kHz
ement reference, this may account for discrepancies in
[3Pi Controller only]
ers the use and application of these advanced measurement
zer performs fast Fourier transformation (FFT) on both voltage
ase. The resulting frequency sp
CTION field and select VOLT or CURR. (The BOTH selec
one FFT result can be displayed at a time.)
field and select the TABLE or BAR display mode. The TR
to FFT results.
A MODE field and select ABS or
erence and display all harmonics as a percentage of the
are always shown with respect to the fundamental frequency.
amental is always shown with respect to phase A.
nly applies to the TRACE display mode.
MODE and select SINGLE or C
California Instruments
at high frequency
ectrum can be displayed on the
REL. Absolute display mode
ONT. The SINGLE mode will
MX Series
r
tion
ACE