Ametek 13500CS/3, Руководство пользователя

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User Manual – Rev J CS Series
California Instruments 84
4.7.4 Pulse Transients
Pulse transients let you program the output to a specified value for a predetermined amount of
time. At the end of the Pulse transient, the output current returns to its previous value.
Parameters required to set up a Pulse transient include the pulse count, pulse period, and pulse
duty cycle.
Note that Pulse transients can only be programmed over the bus, not the front panel. Refer to
the SCPI Programming Manual for more information about programming Pulse transients and
triggers.
4.7.5 List Transients
List transients provide the most versatile means of controlling the output in a specific manner as
they allow a series of parameters to be programmed in a timed sequence. 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.
4.7.6 Programming list transients from the front panel
The output transient system allows sequences of programmed current 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).
This 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:
Current, Current slew rate, Frequency, Frequency slew rate, Compliance voltage,
Function, Dwell time, Trigger out, Phase.
The current, compliance voltage 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 current,
voltage, and/or frequency. The rate of change for current and frequency is determined by the
slew rate set. Voltage slew is fixed at MAX and cannot be programmed.
If the current is changed from 1 A to 2 A and the Current slew is set to 10 A/sec, the current will
ramp from 1 to 2 A in 100 msec. ( [2 - 1] / 10 = 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 2 A, e.g. it should be at least 0.1 sec. If not, the current will never reach
the final value of 2 A 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 1 A to 2 A over a 0.1 sec period and then remain at 2 A 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 current 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.