How does Fast Generator work? Which currents GoldExI sweeps? What is the shape and the amplitude of the generated signal? What are the limitations?
Starting from version 3.16 GoldExI implements so called Fast Generator in the measurement window. To run it just mark [x] Generator checkbox. After this, the generation proceeds indefinitely until it is stopped by unchecking [ ] Generator checkbox or doing something incompatible with generation (moving scroll bars of currents connected to the generating DAC card, setting all/sweep1 currents to zero, pressing DoIt or Cancel buttons, etc...)
Which currents GoldExI will sweep when the generator is switched on? GoldExI sweeps all currents which are defined as 'sweep1'. Note that for generator to work, all sweep1 currents must belong to the same DAC card and be related to consecutive channel numbers.
What is the shape and the amplitude (minimum and maximum value) of the generated signal? The shape and the amplitude are taken to exactly mimic the behavior of sweep1 current when 'DoIt' button will be pressed. So, if in the measurement window there is a limit control block which is associated with sweep1 current, generator will use the value of start and stop limits to set the minimum and the maximum amplitudes of the generated waveform and will use the state of '2Directions' checkbox to generate either symmetric or completely asymmetric saw-tooth waveform. When measurement window does not have a limit control block associated with 'sweep1' current, symmetric saw-tooth waveform consisting of 512 points is generated by default.
The frequency of the generator can be set in Options | WaveForms | Logic Unit Frequency. Note that NI-DAQ does not guarantee that exactly the specified frequency will be set, but the one as close as possible to the specified frequency. Note also, that it is quite easy to specify the frequency which goes beyond device capabilities, e.g. having sweep frequency = 100 Hz with 1024 points per curve results in a DAC update rate above 100kHz which is already on the limit of some NI-DAQ cards. If you have 2 sweep1 currents, sweep frequency = 50Hz is on the limit of card capabilities, and so on. So, don't be surprised if What You Get Is NOT What You Want. ;-)
See also: Preventing current jumps on DAC output.
[Review]
[Download]
[Gallery]
[Links]
[F.A.Q.]
[HerStory]
[Bugs]
[Suggestions]
[Author]
[EMDAQ.DLL] [Home]
[forum]
|
Designed
by Edward
Goldobin.
All Rights Reserved |
|
