AMETEK Compact IX 2253 - Manual (Page 85)

User Manual 2253i / 2253iX
AMETEK California Instruments 85
frequency will not be reflected in the i/iX Series measurements. When using an external measurement
reference, this may account for discrepancies in readings.
4.6 Harmonic Analysis
The iX Series model controller offers advanced power analyzer measurement capabilities. These
functions can be accessed over the bus only except for total harmonic distortion (THD) for voltage and
current which are available from the front panel as well.
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
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
possible 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
The voltage can be programmed in the following transient operating modes:
STEP Causes the output to permanently change to its triggered value.
PULSE Causes the output to change to its triggered value for a specific time, as determined
by the Pulse menu parameters.
LIST Causes the output to sequence through a number of values, as determined by points
entered in the List menu.
FIXED Disables transient operation for the selected function.
4.7.3 Step Transients
Step transients let you specify an alternate or triggered voltage level that the AC source will apply to
the output when it receives a trigger. Because the default transient voltage level is zero volts, you
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.