AMETEK Lx Series II - Manual (Page 102)

User Manual Lx / Ls Series II
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above this cutoff frequency will not be reflected in the Lx Series measurements. When using an
external measurement reference, this may account for discrepancies in readings.
4.6 Harmonic Analysis
The Lx Series controller offers advanced power analyzer measurement capabilities. These
functions may be accessed from the Meas screen. The phase for which the analysis or
waveform acquisition is done may be selected using the Phase key when in three-phase mode.
The 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.
The Ls Series provides this capability only if the –ADV option is present.
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, RS232C, 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.