PXIe-4112

[IchiroItoi]

Are these floating supplies that can also be stacked like 60V + 60V = 120V ?

   or can be used in a split supply configuration +60V and -60V ?

[JasoNI]

Hi IchiroItoi,

Yes, the Power Supply’s channels can be combined to provide 120 W of power. I have provided the product page below for reference to this feature.

PXIe-4112: http://sine.ni.com/nips/cds/view/p/lang/en/nid/211482

Regards,

Jason D

Applications Engineer

National Instruments

[IchiroItoi]

Hi Jason,

Thank you for prompt reply.

I went through datasheet.

Best regards,

Ichrio Itoi

[Bugsy26]

1. What is the maximum sequence length for PXIe-4112 ?

I receive this error whenever i have a sequence greater than 540 !

error 1074118618 occured at niDCPower Initiate.vi

2. What is the minimum step width of a sequence ? Is there an User Manual with such specifications ? I couldn't find one !

[brandonj]

Hi Bugsy,

I experimented and found the maxmimum sequence length to be 454 steps for the PXIe-4112. What do you mean by minimum step width? If you mean minimum time between sequence steps, this will depend on the source time, source delay, and measure time (see Figure 2 of link below). You can minimize this by setting source delay and aperture time properties to 0 (aperture time will coerce up to the lowest possible value). 

http://www.ni.com/datasheet/pdf/en/ds-502

[Bugsy26]

Hi brandonj,

1. Regarding the sequence length, i'm in need of a bigger value. I found this interesting thing written at the address below, but it's for PXI-4132.

http://digital.ni.com/public.nsf/allkb/F2307397EFD9C7D2862576650061558F

I wonder if it's applicable for PXIe-4112 too !

2. Regarding the step width, you got the idea. From all the 3 parameters you've said (source time, source delay, measure time), i'm interested in the minimum value of source time. For the other 2 there are property nodes that can enable/disable them ( to disable them -> Source Delay=0; Measure When = On Demand).

3. Regarding the datasheet : thanks for it. I hoped there was a more detailed one. I found the one you've send me and some others ...

The project that i'm working on is to apply different waveforms like ramp, pulse, trapezoidal.

I have to declare 4 parameteres : Start Voltage, Stop Voltage, Period of the entire waveform and Period of the On Time ( In PULSE and TRAPEZOIDAL case ).

But i have to declare them one after another, and after that to run the waveform.

1. Set Start Voltage

2. Set Stop Voltage

3. Set Waveform Period

4. Set Waveform On Time

From what i've seen, all the property nodes that refer to PULSE VOLTAGE are not available for PXIe-4112 !

If you have any suggestion, it will be more than welcomed !

Thanks and have a nice day !

[brandonj]

Hi Bugsy,

I don't see any issues in using the method outlined in that first link for the 4112 to write a sequence longer than is available for onboard memory (but remember it will take a finite amount of time to load each sequence onto the 4112).

Indeed the 4112 is highly limited and the source time is not deterministic. If you haven't already, I recommend you take a look at this: https://decibel.ni.com/content/docs/DOC-12359 . It uses the source delay to determine the frequency, and feeds the points for the sequence by use of a waveform generation function. Another example to look at is the solution posted here http://forums.ni.com/t5/Digital-Multimeters-DMMs-and/sine-wave-generation-with-smu/m-p/3270639#M2593... Both examples will require some work to get around the limitations of the 4112.

Regards