Acquiring a signal from two separate DAQs at different rates at the same time

Hi I am trying to setup a system where I need to build two separate arrays one from two separate sets of data. The data needs to be brought in at the same time, but at a different rate. One set is from the PCI-4472 and will come in at ~10Hz, while the other is from a SCXI-1102 that is connected one channel on a PCI-6070E at ~3-5Hz. I was wondering how to have the two be read at the same time, but at the different speed. I am using LabView 6.1. Thanks in advance.

Hi Muheesh:
Since your DAQ's are working at an exact multiple of one another, what you could do is fill alternate channels with some "DUMMY" data...like zeros. Then you could index the array and match it up with the faster card. It might seem like a waste of memory, but it will give you two sets of aligned data, which seems to be what you need. If you're operating them at some weird multiple, it's a bit trickier. Whatever you do, you're going to have to insert some bits somewhere. Look for a least common factor (LCF) of your sample rates, and see if you can divide by that before logging the data.
Eric
Eric P. Nichols
P.O. Box 56235
North Pole, AK 99705

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before in hotter days. It would not restart. The entire boot block of the disk seemed to have been garbled. This did not seem even feasible at all, so I decided to shut its power off for a while. It came back up after a while,
and everything looked normal. Then, it did the same thing again. I decided to open its cover and check on its multiple fans as there was nothing else that could go wrong.
I then noticed that the computer with the Microsoft Windows Vista Operating system which had been receiving the broadcast TV, was displaying a freshly-booted log-in screen. It had "Blue-screened" while I was working on the other computer
across the large room. This again did not seem any feasible as there had been utterly no connection between these two computers. Even the AC power line circuit was different. Furthermore, this computer had the most extensive air-cooling system
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the 80 mm fan mounted in the front side of the case, with its side with rotating blades clamped on the perforated part of the steel case serving as the fan grill, was starting up fine. But, as the time passed the spring-loaded rotating hub was slowly
drawn toward the perforated steel case by two means: The partial vacuum formed by the suction generated by the blades of the fan, and by the magnetic attraction of the rotating hub with electro-magnets in it to the partially magnetized, perforated steel casing.
The first effect was always there, so it was not the real cause, but once something else came along, it really helped the latter. The hub was slowly drawn to the perforated steel casing due to magnetic attraction, with the holes in the casing
inducing a huge air-drag on the hub blades as there was no by-pass around to supply the extra-air needed to reduce the partial vacuum. In addition, the rotating hub with the electro-magnets now was very close to the conducting metal surface and the induced
eddy-currents in the metal by the moving electro-magnets had added even more drag on the rotating hub, causing it to come nearly to a halt. The disk drive electronics was heating up and was causing DMA access faults which in turn caused the Linux kernel
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Well, this was nearly unbelievable, but true... I had not brought any magnets into the room and I still do not know how the computer case got magnetized. It has been working at the same location for years. The solution was to move the fan
away from the perforated steel casing a little so that some air could come in through the gaps on the sides of the fan (hence supplying a by-pass), reducing the partial vacuum in front of the fan. This kept the rotating hub far enough away to prevent
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The real solution is to saw the perforated part of the steel casing in front of the fan away, and to replace it with a better fan grill. The best fan grill material I have found is the finely perforated, thin, black aluminum sheet that is usually
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externally powered fans that did not load the computer power supply. And, all of the fans were working well. In the meantime, the Microsoft November 2014 updates for the Microsoft Windows Vista came out, and as usual I told the computer to
load and to implement them. Sure enough, the computer again "blue-screened" in the middle of the update procedure.
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requested using the Microsoft Windows Vista problem reporting system. Within minutes, the Microsoft came up with a diagnosis that the USB driver code in the system had a serious bug. I had not changed this code in years. It suggested that
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-- Yekta

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the hobbyist's knife and peeling the plastic layers off starting at the cut. The following step was to cut the aluminum cans of the capacitors from the top to the bottom using the hobbyist's knife like a can opener. One could not use a saw like
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