AMETEK Lx Series II - Manual (Page 104)

User Manual Lx / Ls Series II
100
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).
The section provides some examples of programming output changes (transients). Transients
are defined as a series of numbered steps in a list. The list is executed sequentially. Each step
has a number of fields that can be set by the user:
Voltage, Voltage slew rate, Frequency, Frequency slew rate, Current, Function, Dwell
time, Trigger out, Phase.
The voltage, current and frequency settings are the same as one would do form the setup screen
using the knobs. At each step, the output will be set to the specified voltage,current and/or
frequency. The rate of change for voltage and frequency is determined by the slew rate set.
Current slew is fixed at MAX and cannot be programmed.
If the voltage is changed from 10 Vac to 20 Vac and the V slew is set to 100 V/sec, the voltage
will ramp from 10 to 20 Vac in 100 msec. ( [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 of 20 Vac, e.g. it should be at least 0.1 sec. If not, the voltage will never
reach the final 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 example the dwell time is set to 1.0
sec, 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.
Once the dwell time set for a step in the list expires, the next step is entered (if available, if not,
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
only 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.