DAQ6062E, 12 or 16 bit ADC?

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• calibrate the values of 12-bit ADC

  I'd like to understand how to convert integer values of a 12-bit ADC in tensions. I use a box NI USB-6008 in differential input mode. It is 12 bits of resolution in differential mode.  I use a simple VI to collect 100 samples of the differential analog input voltage 0 (AI0).  When I connect AI0 + and -AI0, the tension between them must be zero.  When I traced the number returned by the routine of the CQI data, I see-32768 values most of the time over a few jumps to + 32752.  When to convert format I16 U16 format numbers. I see values ot + 32 768 for the most part, as well as a few jumps to + 32752.See attached shot of front block diagram of the display panel.

  Looks like Labview add 4 zeros at the end of the right hand of the binary number 12 bit returned by CDA.  Is there a simple way to make ADC return numbers like 0, + 1, -1, when the voltage is about zero?  I could do the following:

  1 convert the values returned by the ADC since I16 to U16.

  2 divide by 16.

  3 subtract 2048.

  I teach students about the basics of analog digital conversion, and I don't want to have to explain this clumsy scheme, if I can avoid it.

  Thank you.

  Bill

  Hi Bill,

  Looks like you've discovered the complement representation two that LabVIEW uses to represent signed integers. Not adjusted data are drawn directly on the hardware registers and are represented as they are on the unit.

  If you want to convert the values, you can convert as you have indicated. You can also take the opportunity to explain the complement to two of them if it's as part of your course, or you can just put the arithmetic in a VI if you want to hide.

  If you look at the unsigned values, you could also explain to them that it is in the voltage range, the value is.

  For example, 16-bit unsigned gives a range of 0-65535. If you have selected the voltage range is-10 to + 10 v. If you have 0V, so you should expect a reading around 32768.

  Here's the wikipedia article on the complement of two for reference: http://en.wikipedia.org/wiki/Two's_complement

• 9215 is 16-bit adc and I can not find the highest resolution of it

  Dear Sir

  I use the signal 0-5 v dc for a majority use, but I saw that the control is done in 5 steps only (on the other resolution of 1 volt in a way) how can I do

  Thanks I realize

• noise in the Vref for pipeline ADC 14 bit

  I work with a pipeline of 14 bit ADC clock of 10 MHz. The total of entry is 4 Vp - p bonus.

  There seems to be a lot of noise in the VRef (about 50 mV swing noise) and tensions are given directly from feeding to the ADC.

  What are the ways to reduce this noise?

  Maybe not good advice. It is a pure analog circuit

  ... but what do you expect to answer if you do not give detailed information on the references used, ADC used, schematic and layout?

  However, to seek application of technology notes linear www.linear.com (look for those of Jim Williams!)   and texas Instr. TI.com

  Find a Council of analog circuits and post your question, some screenshots of scope, schema, and page layout, he...

• What is the effective resolution of the Council Usb6361 ADC

  I used a USB-6361 with 16-bit ADC Board. I went to simulate an implementation of County ADC bit lower and I noticed that the data collected from the 6361 seem to be 16-bit resolution. Here is an example of a part of the waveform samples (of type Double), with 0-5V range:

  1.0727841521285737 V

  1.09002147857432474 V

  With a range of 5V and a 16-bit ADC, the bits of LS should quantize to 5V/2 ^ 16 = 5V/65536

  0.0000762939453125 V

  None of these samples can be represented with 16-bit precision; There are fractions remaining bits.

  example: 1.09002147857432474/5V * 2 ^ 16 = 14287.12952396...

  is it's 16 - bit quantum and the beach was unipolar 5V I expect an integer result.

  Now, it's pretty easy to requantify 16-bit data solved, but what gives with the raw data from the USB-6361?

  Why is it not 16-bit quantified for the beach?

  The data do not seem to be 16-bit quantified for 0 - 10V or +/-10V or the other.

  Clues here?

  Ben covered the series X bipolar ranges but there are other factors that lead to what you see:

  X series applies calibration in the software and it affects the HW and the returned data. On the one hand, the X series exceeded 5%, details covered in the section HAVE tied Ben manual. Also, on the application of calibration of the USB-6361 actually uses a third order polynomial for scaling - the voltage at the scale that you read don't directly correspond to the widths of code. You can make an unadjusted DAQmx reading and get direct bit of CDA. You can get the coefficients of scaling with the Coefficients of the scale property to HAVE device. If all goes well in looking at these, you can get what you need the device.

  Thank you

  Andrew S.

• mcb2300 (lpc2378) SPI and external ADC

  Hello

  I use LabVIEW 2011 Embedded for ARM in collaboration with MCB2300 Development Council and MCP3204 12 - bit ADC chip. I try to use the base screws of SPI to communicate with the MCP3204. I enclose below the screenshot of my VI. Can someone tell me if this is a way of thinking? I would like to read the data from all 3 channels of ADC - 3 axes of the ADXL sensor connected. In addition, I have attached a few pages of the MCP3204 datasheet.

  Thanks in advance

  Hello

  There is solution on NI Developer zone, which can help you - https://decibel.ni.com/content/docs/DOC-15231

• Average of ADC signal

  Can someone help me find the way to a signal. I used simulate the signal function of sine wave with the freq of 100 kHz, sampling FREQ 500kHz and 1250 samples. I spent this signal to a 16-bit adc and found the digital waveforms. Now, I want this signal for 1250 samples on average. Can someone tell me how to proceed?

  Hi sanju,.

  have you noticed the message #2?

  Define the "D" in "ADC"! Generally, you will get a 'value' number of bits of the ADC (12/08/16 by value bits). The SimulateSignal will also give you values - and these values are averaged in my example...

• ADC signal formatting problem!

  Personal salvation OR.

  IAM having problems trying to measure tension in the port adc to a PIC 18F4550 through Labview.

  the fact is that iam like a beginner in programming G, and I don't know how to maintain the chain that iam get VISA read module and therefore iam does not receive the data in the appropriate form.

  IAM using an 8-bit adc, so I pretend to read the 255 when iam in FS. but iam get something like "48", as you can see in the attached screenshot.

  I thought about it. I don't know exactly why but it seems that the number of the indicator and all the conversion in takes only a part of what im sending.

  It worked simply by attaching a string indicator in the outpin of the VISA-READ. It was the first option I thought the first time, but it did not work this time.

  Sorry for the flight of your time and thank you for the help!

• is daq bit resolution applied to the area defined in the daq assistant or well to the limits of physical blood of the daq hardware.

  Hello, this is my first post here,

  I've been wondering about this:

  When you configure a new daq with the daq Assistant, is the resolution applied to the voltage / number of entries you define, or is it a fixed value per volt by channel.

  For example:

  I have a 6015 usb data acquisition, it has 16 inputs analog, 16-bit resolution 250 kech. / s 09:50 volts.

  so is this as (2 ^ 16) / (16 * (-10-10)) = my resolution through volt?

  or that this has nothing to do with the amount of channels,

  If I want to measure more than 0 to 5 volts, my 16-bit apply from 0 to 5, or even more scale of data acquisition (which is 09:50 volts)

  Thank you

  Marco

  You will get full-resolution 16 bits on each channel regardless of the number of channels is configured.  Renault most are multi-plexed if your specification of sampling RATE in usually a global significance that you can only scan channels with a sampling frequency = MAX RATE / number of CHANNELS.  Also, most NI Renault have a Programmable Gain amplifier on the front-end server, so if you specify a range of voltage smaller in your task configuration the amplifier will automatically increase the gain to use most of the possible BIT ADC.  You see care device and for more details...

• Acquire analog data with 16-bit accuracy

  I use PCI 6259 DAQ, which only supports 16 - bit ADC. Analog 2D NChan DBL NSamp vi gives an output of 64-bit double data. Since I lose most of the bits and memory, is possible to get the number to decimal floating get a 16 bit? Otherwise, what about 32-bit single-point accuracy? I know that you can convert numbers between data types but to convert a series of data in a loop in real time will probably cause a decrease in performance of the system.

  Typo, sorry should read polymorphic.

• 24-bit histogramming (memory issues)

  Hi all

  I'm trying to create a histogram 24 bits of code for a 24-bit ADC. For further processing of these data, I need all of the bins to be stored, i.e. I found that the histogram in the functions palette VI will not work for 24 bits of data, I'm LV 2010 but on 32-bit Windows XP, (with ~ 4 of RAM)

  The histogram vi meets memory problems with my data.

  Even at a more basic level if I try init an empty array with 2 ^ 24 U32 elements (and therefore 16 M elements in the table) each index of the array represents a code adc and is incremented each time it is acquired. When I initialize and start using such a table I get "out of memory". I would have thought that 16 M elements was not a huge group of data and it is not difficult to find of 16 MB of memory contiguous with allocation of 2G of the application by the operating system.

  I was wondering if anyone had a proper of the present explanation or she might suggest a way around this problem.

  Thank you

  dsone1

  I would change one or two things:

  1. As the shift register is not initialized, the memory usage will be low until the first time that the VI is run in the init mode, date to be allocated to run the memory. It is preferable to assign at compile time as in my modification.
  2. I would recommend an initialized overall feedback node, eliminating the while loop. It also provides an initialized array if the user forgets first run init. (the implementation of the same with a shift register would need also the ' premiere' primitive?).
  3. I move the code init before the code of the histogram, which allows to init and calculate a new histogram at the same time.

  Here's a rough draft

  

• Check an ADC with the PXI-6259

  I use the PXI-6259 M Series DAQ in LabWindows/CVI ADE, and now I want to check if a 8-bit ADC works properly or not.

  The entrance to the ADC is a sine wave and I acquire the 8 bits of data (in Digital Format or Port) every time that the A/D conversion is complete. Then, I want to regenerate the sinusoidal wave with digital data using 6259.

  The analog channel supports only the numbers to decimal floating 64-bit data format but not Unsigned and data format signed integers, have of I scale digital data acquired for floating-point numbers 64-bit data format according to the amplitude of the sine wave and then regenerate the waveform?

  If so, I have to Brown the APFI0 or the APFI1 as the DAC reference voltage source?

  Thank you very much for your help.

  Sxs707

  Done writing DAQmx supports the signed and unsigned writings. Open the library > NOR-DAQmx > write functions and find DAQmxWriteBinaryI16, DAQmxWriteBinaryU16, etc.

• Re: Satellite P200-1JR-S/PDIF is stereo only

  Hello.
  I have the Toshiba P200-1JR.
  When I connect laptop to hollow receiver optical cable and trying to watch movies with AC3 5.1 sound, I get only a stereo sound.
  1. the receiver works correctly with the PS3 and DVD player.
  2. in S/PDIF options I have Setup with only 2 speakers.
  Screenshot: http://img177.imageshack.us/my.php?image=soundei1.jpg
  3. I have the latest audio driver from the Toshiba site.

  Please help me to get AC3 5.1 hollow optical cable.

  Thank you.

  Hello

  I don't know if you will be able to watch movies with 5.1 sound AC m.

  The fact is that this laptop supports the Audio Format: 24-bit (DAC, read), 16-bit (ADC, recording), stereo.

  In addition, it would be very interesting to know where you found the plug S/PDIF. ?:|

  To my knowledge, this laptop supports only mic and headphone jack.
  The headphone jack allows you to connect a _stereo_ headphones or other devices to audio output of the external speakers. I didn't find the S/PDIF connectors.

  I have connected my laptop to a stereo and in my case the HiFi, equipment produces the sound 5.1 and not the sound card on laptop!

• Band bandwidth SMU for FPGA chassis

  I'm specing on material for an FPGA FlexRIO system. The module FPGA and adapter, we will use has already been defined, a 7975R and a 5782. For our application, we will be streaming 2 inputs analog on a RT controller attached. From my understanding, these samples will be single precision floating point numbers, each of which is a piece of 4 bytes. Assuming that the 5782 max sampling rate is used, 250 MECH. / s, I think that I will need 2 GB/s of bandwidth on my SMU chassis.

  Here my question, then, what SMU chassis should I consider? The SMU-1082 has "up to 2 GB/s per-slot dedicated bandwidth", but it is a real or theoretical number? Normally, I would just get the next thing that high, just to be sure, but there is a significant price difference on the way to the SMU 1085, which is also much larger I need. So I would like to save space and several thousands of dollars if I could get away with a 1082. Sampling does not quite to the max modules of adaptation would be acceptable, but I would be interested to know where about my maximum sampling speed would be.

  Thanks in advance for your help.

  The 1082 has more than enough bandwidth to stream data at a time to the analog inputs of a 5782.  The 5782 has a 14 bit ADC with two channels that sample to 250 ms/s. These samples are returned as an I16 with the two least significant bits filled with zeros.

  So assuming that you transfer all I16, rather than packing the 14 bits of data, you would have the following bandwidth requirements.

  2 channels x 2 bytes/sample x 250 mega-samples per second = 1 GB/s

  The 1082 a 2 GB/s of throughput dedicated per slot. The 7975 accommodates up to 1.6 Gbps streaming. I would recommend calling chat with someone, if you are looking for a recommendation on what type of chassis to purchase, but based on the requirements of streaming that you're fine with the combo 7975 and 1082, you thought. Just make sure you get a controller which can accommodate streaming speeds you're looking for. The 8840 is a good candidate.

• Performance outputs analog 4461

  I'm generating a sine wave of 1 kHz to 1.5V waveform DC offset and 800mVp.  I use this signal to test a 12 bit ADC.  As indicated in the attachment the best I can get is - 70dB on the second harmonic, which is to be able to test only a system of 11 bits.  I need better that - 75db on the 2nd harmonic. I use the output in an active probe impedance high through a HP being a 24-bit DAC I thought that it would be able to perform this task.  What Miss me?  I've also attached the LabVIEW code that I use.

  John