To use the external clock for SCTL myRIO

Hi people,

I'm trying to find a way to get a 2.5 PSM 16-bit ADC, TI ADS1602, to send data to the device myRIO. Ideally, I'd like to bit Records at 40 MHz in order to obtain the benefit of the PSM full 2.5. I know that I can create an 80 MHz SCTL on the FPGA to create a clock of 40 MHz, but when I checked the clock on an oscilloscope signal, it was obviously greatly degraded by bunch speed limits, so he looked more like a sine wave to a square wave. I doubt it would work for use as a clock signal to drive the ADC since ADC specifications say that eligible jitter is around 100ps.

I can use an external oscillator to drive the ADC, but then I have to find a way to sync the clock with clock FPGA 40 MHz. is there any kind of PLL structure that would allow me to sync the clock FPGA myRIO to an external clock? Is there a way to do a loop simple timed cycle driven by an external clock? Or if I was able to customize the FPGA personality to accept a SPI signal up to 40 MHz (ten times her supported limit...), he would be allowed to use an FPGA to ~ 160 MHz and tell him to taste the SPI line each loop and proceed from there?

Thank you!

Hi 3.14159... ,

The myRIO doesn't have the ability to import a clock to use on the FPGA block diagram for clock loops timed cycle unique (SCTLs). The sbRIO-9651 new coming out week OR (not shipping yet) is the only sbRIO who has the ability to import an external clock in LabVIEW. Many of our products FlexRIO also have this ability.

Like you we have it, you can taste the signal at twice the frequency (or maybe more) to and wait an edge trigger to run a certain element of logic. "" "If you open the example Finder and navigate to hardware input and output" R series "FPGA Fundamentals ' triggers and guard dog" trigger detection, this gives a simple example to do this. Once again, since you are eager to taste 10 times the frequency of support, all bets are off, but it may be worth trying.

Tags: NI Products

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Is it possible to use the internal clock for meter tasks in the buffer?

Hello

Hardware: USB term mass 6251

Software: LabView 2011 SP1

I need to measure the angular lever position and speed of a carpet. For that I use two quadrature encoders. To accurately calculate the speed I use buffered from the measures of position using one of the available onboard counters. I understand that for this technique, I provide a sample for the meter clock. I wonder if it is possible to use the internal time base. Note that both of my counters are used so I can't generate a signal to clock with them.

I found two conflicting pages related to my problem:

1) http://digital.ni.com/public.nsf/allkb/EA7FFFEAFC3E1D85862572F700699530

2) http://digital.ni.com/public.nsf/allkb/775290A3121D1FFC862577140074D3B3

The first says that I can use the internal clock of 100 kHz, and the other says that I have an external clock.

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Javad

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On your specific device, there is not a direct route from the time base of 100 kHz for the meter (according to the routing table of MAX):

Yellow cell indicates that a route is possible but there is not direct (the "gate" terminal is used as sample clock for counters of the M series). Mouse on the cell reveals yellow that make this route really requires the use of a counter (so it is not suitable for your application).

On the line above "100kHzTimebase" you will notice it is called 'FrequencyOutput', which does not have a direct route to the door. This would be the way to go if you want to route 100 kHz (or some other frequency) as your sample counter clock - you can set it up the same way to a standard meter output task:

The output frequency doesn't have that many features like a meter output, but it is able to generate a continuous stable frequency. There are only 32 different frequencies that can be generated using Freq Out on the 6251:

{10 MHz, 100 kHz} / {01:16}

Do not forget that the resolution of your measure of frequency by using this method will be equal to how many times you update the measure (hopefully, that makes sense). In other words, if at the end of all the 1 second, you take the total number of charges since the last second, you would have a 1 per second equal resolution change in the number. If you take the difference twice per second, you would end up with half the resolution. You will be sampling the account register fairly quickly, but you will need only to do the calculation of the frequency after that all N samples in order to obtain a significant number.

Another method that will certainly give a higher resolution in less time at typical speeds of coders is to set up a measurement of the frequency (the counter will count the internal 80 MHz base time period your external signal and the pilot calculates the frequency based on the result). This method uses only a single entry - so you can just feed the 'A' your encoder quadrature signal (the method will not work if you are interested in absolute position or direction). Without using signals A and B together, you will be susceptible to noise (which is common to have a quadrature encoder) that you want to delete (perhaps by setting up a digital filter). Finally, you want to set a reasonable timeout on your reader calls (which will be blocked until a period of your external signal occurs), and the error-200284 handle simply report "0Hz" to make sure that your program is still sensitive even without an external signal present.

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I'm trying to measure the number of edges (rising) on a square wave at 5 kHz with a generator function on a device of the NI PCIe-6363. I configured a channel of County of front edge of counter at the entrance of the PFI8 device. I use an external sample clock that is provided by the output of the meter of a NI USB-6211 housing channel. If I acquire for 10secs then ideally I would expect to see a total of 50000 edges measured on the meter inlet channel. However, my reading is anywhere between 49900 and 50000.

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I've got:

cDAQ-9174 chassis

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This 9422 module will be connected to a meter that will send a square wave. What I need is the frequency of the square wave. Problem is, I don't have any idea how to get it.

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3 tasks of frequency are sampled off the input signal - so if the input signal does not switch when you start the program or if there is a long break (longer), you will receive the time-out error when the reading function blocks for more than your specified time-out. You should be able to just 'manage' the time-out error so that if it happens you can report a frequency of 0, ignore the error and try to read it again. There are also other approaches such as using events DAQmx or samples available to read to vote, but none of them are available through the DAQ Assistant (the idea is that you avoid making DAQmx Read blocking call until you know there are samples to read).

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To use the external clock for SCTL myRIO

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