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separated by 67 millisecond, zero volt intervals.
Transient list programming is supported from the front panel and may be accessed by selecting the
TRANSIENTS screen. Transient lists can also be programmed over the bus. Refer to the SCPI
Programming Manual for more information about programming List transients and triggers over the
bus.
Figure 4-11: List Transients
The list specifies the pulses as three voltage points (point 0, 2, and 4), each with its corresponding
dwell point. The intervals are three zero-voltage points (point 1, 3, and 5) of equal intervals. The count
parameter causes the list to execute twice when started by a single trigger.
4.7.6 Programming list transients from the front panel
The output transient system allows sequences of programmed voltage and or frequency changes to
be executed in a time controlled manner. Changes can be either step changes (maximum slew rate)
or ramps (specified slew rates).
California Instruments 85
User Manual Compact i/iX Series
The section provides some examples of progr ut cha ansients). nts are
defined as a series of numbered steps in a list.
number of fields that can be set by the user:
Voltage, Voltage slew rate, Frequency, Frequency slew rate, Current, Function, Dwell time,
Trigger o
The voltage, current and frequency settings are t e as one o from the screen
using e shuttle keypad. ch step, put will be the specifie ge, current
and/or frequency. The rate of change for voltage and
Current slew is fixed at MAX and cannot be programmed.
If the ltage is c from 10 20 Vac V slew is 100 V/sec, tage will
ramp from 10 to 20 Vac in 100 ms. ( [20 - 10] / 100 = 0.1 sec). The dwell time is the time the output
will remain at this setting. In this example, it should be set long enough to reach the final programmed
value 20 Vac, ould be t 0.1 sec the voltag never reac al value of
20 Vac before the next step in the transient list is executed. The dwell time may be set longer than 0.1
sec in this example. If for examp c, the voltage will ramp from 10 Vac to
20 Vac over a 0.1 sec period and then remain at 20 Vac for 0.9 sec.
res, the next step is entered (if available, if not,
only
Figure 4-12: Sample Transient Output Sequence
This output can be accomplished using the following transient list.
amming outp
The list is executed sequentially. Each step has a
nges (tr Transie
ut.
he sam would d setup
th knob or At ea the out
frequency is determined by the slew rate set.
set to d volta
vo hanged Vac to and the set to the vol
of e.g. it sh at leas . If not, e will h the fin
le the dwell time is set to 1.0 se
Once the dwell time set for a step in the list expi
execution stops and the output remains at the final values set in the last step of the list.)
Note that while there are parameters for both voltage and frequency level and slew rates, there is
one dwell time, which applies to each step in the transient list.
Front panel entry only supports the LIST mode of operation. For Pulse and Triggered modes, the
remote control interface must be used.
When entering transient lists, each list must be entered sequentially starting with step #0. If a list point
is not yet set, the step number cannot be increased past it.
The following sample illustrates the use of transient system to program controlled output changes.
California Instruments 86
User Manual Compact i/iX Series
Step # Volt V
(data point)
Slew Frequency FSlew Dwell
0 70.00 MAX 360.0 MAX 0.100
1 110.00 100.0 440.0 MAX 0.900
2 130.00 MAX 240.0 800.00 0.250
3 90.00 53.3 240.0 MAX 0.750
4 90.00 MAX 460.0 MAX 1.000
5 110.00 MAX 400.0 MAX 0.800
6 88.00 MAX 400.0 MAX 0.200
7 110.00 MAX 400.0 MAX 1.000
Table 4-2: Sample Transient List
4.7.7 Waveforms Function List
The FUNCTION field available in each transient list event setup menu may be used to dynamically
switch waveforms during transient execution. This allows different waveforms to be used during
transient execution. Waveforms may be switched without the output of the source being turned off. For
waveform list so different waveforms may be
ecution.
to
ient execution however. To keep the phase angle synchronization, the dwell times have
to be eger number eriods of time, phase synchronization may get
lost du skew betwee tor and the transient state machine.
three phase configurations, each phase has its own
programmed on different phases during transient ex
Figure 4-13 illustrates the concept of using different waveforms at different steps in a transient list. In
this case, the change was programmed to occur at the zero crossing. Any phase angle can be used
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