Simultaneous sample and hold

[cdr166]

Hello everyone,

This is the hardware we are using our project and our labview version is 8.2

NI cDAQ-9172

NI-9025 Analog Input card

I wasnt able to find any information if this current setup is capable of simultaneous sampling and holding.  Eventually, we want to monitor and control synchronous machines.  I'm new to labview and if this equipment is capable of simultaneous sampling and holding does anyone have a sample program to illustrate this.  from NI.com i did find some programs (thermocouples) that had "DAQmx create channel's" in paralled with eachother.  I wasnt sure if that layout executed simultaneous sample and hold.

thanks in advance

[Dennis_Knutson]

Do you really mean 9205 as there is no such thing as a 9025? The Product Brochere has a column called 'Simultaneous Sampling'. The check mark is not there for the 9205. With a single A/D, the channels are scanned sequentially so there is delay between channels.

[cdr166]

Dennis,

I mistyped the module, i did mean the 9205.  Eventually, we'll have to purchase a module with the simultaneous sampling, but for right now the 9205 will work fine.

thanks again,

chris

[Rudi_N]

cdr166:

I hope all is well. The hardware configuration of the NI 9205 will not allow you to do simultaneous sampling and hold. You may want to look at the NI 9211 for that purpose. What would you be eventually monitoring from the machines? Is your cDAQ setup controlling the machines ? Please provide more information so that we can help you further.

Regards,

Rudi N.
Applications Engineer

[KyleBryson]

Neither the NI 9205 nor the NI 9211 are simultaneous sampling modules.  There are three analog input modules for CompactDAQ that support simultaneous sampling:

NI 9215 - 100 kS/s 16-bit +/-10V
NI 9233 - 50 kS/s 24-bit +/- 5V w/ AC coupling and IEPE excitation
NI 9237 - 50 kS/s 24-bit for bridge sensors

Please post if your application isn't handled by one of these modules.  I suspect the 9215 will be a good choice, since it supports the same voltage range as the multiplexed NI 9205 that you already have.

Kyle

[Rudi_N]

Kyle:

Thank you very much for your post. I was looking at a different module when I made that recommendation.

Thanks,

Rudi N.