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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 iX Series is optimized for providing and measuring load currents up to
n
15
ing very low power loads, measurement inaccuracies on rms and peak current
greatly affect derived measurements such as power, power factor and crest factor.
Arms. When power
measurements will
The measurement system on the i/iX Series uses a digital data acquisition system with a 96 KS/s
sampling rate and 48 KHz bandwidth. This means that higher frequency components of the measured
signal are filtered out. Any contribution to the rms value of voltage and current above this cutoff
California Instruments 83
User Manual Compact i/iX Series
frequency will not be reflected in the i/iX Series measurements. When using an external measuremen
reference, this may account for discrepancies in readings.
t
4.6 Harmonic Analysis
The iX Series model controller offers advanced power analyzer measurement capabilities. These
functions may be accessed from the Meas screen.
The iX controller’s power analyzer performs fast Fourier transformation (FFT) on both voltage and
current on each available phase. The resulting frequency spectrum can be obtained over the bus only.
Note: The i Series does not support this capability.
4.7 Transient Programming
4.7.1 Introduction
Transient programming provides a precise timing control over output voltage and frequency changes.
This mode of operation can be used to test a product for susceptibility to common AC line conditions
such as surges, sags, brownouts and spikes. By combining transient programming with custom
waveforms, virtually any AC condition can be simulated on the output of the AC source.
The default voltage mode is FIXED which means
the output voltage is constant and remains at the
ble over the IEEE-488, LAN or USB bus. On power up, the AC source always reverts to the
maximum slew rate for both voltage and frequency.
4.7.2 Using Transient Modes
level set by the user. Changes made to the output voltage made from the PROGRAM menu take
effect immediately. In front panel operation mode, the voltage and frequency slew rates (rate of
change) are always at their maximum of 2E5 V/s and 2E5 Hz/s. Slew rate programming is only
possi
The voltage can be programmed in the following transient operating modes:
STEP Causes the output to permanently change to its triggered value.
riggered value for a specific time, as determined
by the Pulse menu parameters.
ion for the selected function.
4.7.3 S
PULSE Causes the output to change to its t
LIST Causes the output to sequence through a number of values, as determined by points
entered in the List menu.
FIXED Disables transient operat
tep Transients
Step tra
the output when it receives a trigger. Because the default transient voltage level is zero volts, you
4.7.4 P
nsients let you specify an alternate or triggered voltage level that the AC source will apply to
must first enter a triggered voltage before you can trigger the AC source to change the output
amplitude. Step transients can only be programmed through the bus, not the front panel. Refer to the
SCPI Programming Manual for more information about programming Step transients and triggers.
ulse Transients
Pulse transients let you program the output to a specified value for a predetermined amount of time.
the end of the Pulse transient, the output voltage returns to its previous value. Parameters required to
At
California Instruments 84
User Manual Compact i/iX Series
set up a Pulse transient include the pulse count, pulse period, and pulse duty cycle. An example of a
Pulse transient is shown in Figure 4-10. In this case, the count is 4, the pulse period is 16.6 ms or 60
Hz and the duty cycle is 33%.
Figure 4-10: Pulse Transients
SCPI Programming Manual for more information about programming Pulse transients and triggers.
4.7.5 List Transients
Note that Pulse transients can only be programmed over the bus, not the front panel. Refer to the
List transients provide the most versatile means of controlling the output in a specific manner as they
allow a series of parameters to be programmed in a timed sequence. The following figure shows a
voltage output generated from a list. The output shown represents three different AC voltage pulses
(160 volts for 33 milliseconds, 120 volts for 83 milliseconds, and 80 volts for 150 milliseconds)
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