User Manual
2253i / 2253iX
AMETEK
California Instruments
87
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.
The voltage, current and frequency settings are the same as one would do from the setup screen
using the shuttle knob or keypad. 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 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 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.
Figure 4-12: Sample Transient Output Sequence
This output can be accomplished using the following transient list.
