Accuracy of measurement of the SCXI-1100 module

Similar Questions

• Using the SCXI-1520 module for measurement of torque

  Hello

  I'm working on a project that requires a measument couple in real time on a speed-shaft drivetrain configuration phase.

  I have the SCXI-1520 module, and I think with a with a configuration of full-bridge strain gauge to do this.

  The problem is that it is not possible to connect to a real-time measurement, so my first solution was using some sort of wireless transmission to receive data in the SCXI-1520 module

  The Arduino + Xbee seems to be the best way to go, but at the same time, I think I might have a few problems of conditioning of the signal while transmitting data to LabVIEW through the SCXI-1520.

  Don't you think it's the best way to do it, or is there a better solution?

  Thank you!

  Hi Kenny,

  What type of operating system are you using? When you say 'Real time', do you mean look at a signal when it occurs? If you use communication networks, you will not be able to get truly control in real-time because communication networks is not deterministic, and you cannot guarantee the synchronization.

  If you try to get a signal and he discovers that you buy it, you should be able to use the Arduino and LIFA with LabVIEW. Adding the SCXI-1520 will not add any additional resolution in this circumstance.

  Best regards

  Anna L

• is there a protection on the channels of the excitement of the scxi-1540 module

  Hi all

  Is there a protection integrated in the circuit of the SCXI-1540 so that if the primary winding of an LVDT short-circuit and the excitement of the 1540 will not be destroyed.

  Kind regards

  Frank Greenslade

  Christchurch

  New Zealand

  Hi Frank,.

  The SCXI-1540 module provides excitement, so the same amount of excitement is provided by the module, even if the LVDT shorts.  No additional current should come.  Hope this helps!

• Outref pin the SCXI-1540 module

  Hi all

  According to the manual on the rear connector of the add-on SCXI-1540 is a PIN (19) described as OUTREF.

  It connects directly on spindle AISENSE E series data acquisition cards.

  But there is no mention of this PIN in the manual.

  Is it possible to generate a voltage ref in the scxi 1540 and thus a measure of NRSE on data acquisition?

  Is there any detailed of the circuit diagrams of the module scxi-1540 so that I can see whats up with this PIN outref?

  see you soon

  Frank Greenslade

  Christchurch

  New Zealand

  Hi Frank,.

  So first of all, you can certainly use the Ref Out as your floor floating for NRSE measurement.  If we look at the considerations of field wiring tutorial, he talks about these configurations a little more away.  I have trouble understanding what you're trying to reach beyond that.

• entry of mV/psi for SCXI-1102 using the SCXI-1308 module?

  Is there a way to physically connect a mV/psi signal to an SCXI-1102 module, which also uses a block to connect SCXI-1308? What I've read, the terminal block can use only a signal 4-20 or 0-20 Ma, right? I don't see the pins that the terminal block plug to use for output of the pressure sensor mV.

  Thank you very much for the help!

  TQ

  Hi FMC_Pumptest,

  The 1308 Terminal is designed for the current input. You are right that you have entered for 0-20 mA and 4-20 signals my with this block.

  Kind regards

• Rear connector of the SCXI-1520 module as input?

  Good morning,
  
  Regarding connectors on the SCXI-1520, is it possible to use the rear connector as a 68-pin input (instead of an output)? 
  
  I have the following hardware and wanted to know if it's feasible to pipe a signal from an SC-2345 to a PC through the path below.
  
  NI SC-2345 (Signal Cond. Block)  --> NI SCXI 1520 (Universal Strain/Bridge) via 68-pin cable   -->  NI SCXI 1600 (USB Digitizer Card) --> PC
  
  Thanks
     
  

  Hello hma1,

  Unfortunately, you will not be able to do.  The only "entry" would be taken in chassis cascading signals.

• SCXI-1100 filter capacitors

  We have a number of modules SCXI-1100 with the filter capacitors installed in C1, C5, C9 and C10.  All plants look like they were made at the factory.  He is, or was it never (circa 1996-2000), an option to order the SCXI-1100 module with installed capacitors?

  We will be deploying a number of different configurations with this configuration, so it would be easier if we could order like that future acquisitions, rather than install the plugs for each build.

  Thank you.

  Hello, CoryM!

  After investigating a little further, it doesn't seem to be a command option for the filter pre-installed C1, C5 and C10 capacitors. Note, however, that C9 looks like it would have been a capacitor factory, since only 1, 5 and 10 (among others) are left free for modification of customer. This is noted on page 26 (2-9) of the following PDF:

  User Guide NI SCXI 1100 - the user-defined input filter capacitors

  This is the case, you will need to install them for each module. Please let me know if you have any other questions on this point - I'll be happy to help you!

• How to replace the SCXI-1600?

  Since our IT obliges us to switch to Win7, 64-bit edition, our SCXI-1600 becomes unnecessary because there is no 64 bit driver (Sidenote: the device is still available in the online catalog without obvious by the lack of such a driver warning). in an another tread on this subject, Seth_B advise

  For example, the USB-6251 device mass termination that provides 5 x faster sampling with 7 x better accuracy, USB 2.0 transfer speeds of data transfer more reliable and is only about $300 more including the cable between the DAQ hardware and the SCXI chassis.

  I need more information - I don't understand how exactly who will replace the SCXI-1600 as a connection to the SCXI block, for me, it looks like an ordinary e/s USB device must connect directly to several types of e/s analog and digital through a CBS. What cable should I connect the chassis SCXI containing other maps, how she will turn upward in MAX - in short: I need to decide if the replacement is more trouble with respect to particular software rewriting labview and other efforts that fight OUR guys to keep the System 32 bits for this testbed.

  Hello MBohnet,

  To avoid work or acquisition of new equipment on your part then I would recommend against your IT Department to maintain 32-bit system.

  If you need to upgrade to Windows 7 64 bit then the 6251 is an option at your disposal to communicate and scanning information of you modules SCXI.

  There are steps for setting this up

  1. Remove the 1600 chassis.
  2. Fix a module SCXI-1349 in the back one of the SCXI modules. Then use an SH68-68-EPM cable (the cable is listed on the pricing for the device 6251 tab) to connect the SCXI-1349 module to the PCI-6251.
  3. Your configuration in Measurement & Automation Explorer would be alike in what concerns the addition of your device, but you will point to the 6251 as the digitizer.
  4. The quote above regarding the (5 x faster sampling rate) applies only when using the USB-6251 in parallel mode.
  5. You wouldn't have to make changes to code with switching on the material element.
  6. Also, if you are not connected to the USB take a look at the PCIe-6320 or PCIe-6341 with the SHC-68-68-EPM cable. They are less expensive than the USB-6251 housing alternatives.

  Kind regards

  Izzy O.

  Technical sales engineer

  National Instruments

  www.NI.com/support

• Calibration of the scxi-1520 and scxi-1314

  I have a SCXI-1000 chassis with the scxi-1520 module and the scxi-1314 terminal block and I was wondering how to do a calibration on it?  What I have to send back them to OR for calibration or I can send it to a local company to perform the calibration?  If I can send it to a local provider, what the procedure would be to calibrate?  According to the manual of the module scxi-1314, everything we do is check the resistance and for the scxi-1520, it performs internal calibration.  Is this correct?

  Ron

  Hi Ron,

  You can send them to OR get these calibrated, or you may have a local company. Manual calibration procedures are available herefor many of our products online. Here are the procedures of calibration of 1314and 1520.

  Other issues on the calibration should be directed to ni.com/calibration.

  Chris W

• get the MAX to recognize the SCXI modules

  Hello, try to keep it short, we strive for Labview 5.1 running on the XP machine, until we get new set kit to date in the future (current NT machines fail). I tried NiDAQ 7.1 8.1 drivers with a PCI-MIO-16-4th card in a Dell optiplex 755, and the current sticking point is to configure the system via MAX to specify the type of chassis and modules. Modules are not found automatically, and entered manually the results into the slots being declared empty, on a test of the chassis (chassis SCXI-1001). SCXI modules we are SCXI-1100, SCXI-1162HV, SCXI-1124 2 x and 2 x SCXI-1160. What should I do to make this work? Different driver? I'm not at all familiar with the inner workings of Labview!  Thank you.

  Rob,

  Thanks for the reply. The problem was more the cable SCSI detaches from the end of SCXI chassis (these connections seem very inclined to come drifting). The modules then self populated, and the system works now. The system worked very well for ten years, but the old Compaq PC fail now and we have only a few replacement Dell, but of course they come with Windows XP, while the ran Compaqs WinNT, it has so been interesting trying to get Labview 5.1 running on the new boxes with the old cards DAQ until we get funding for new cards / Labview 2010 / Teststand. Problem solved for now!

• Variation of thermal EMF of the PXI-2530 modules

  This message/question is a companion of my the most recent message in another thread.

  In addition to watching some resistance higher than expected that affected current measurements using modules PXI-2530 multiplexer 4W topology, I saw systematic variation in track-to-track blood pressure measurements. Tensions would increase gradually through the 16 channels in a configuration by measuring the voltage at the terminals a resistor 1.5 kOhm with 0.5 au crossing (75 uV). I've identified that the thermal EMF of the reed in the PXI2530 module switches is on the same order of magnitude of these measures and set out to quantify the differences EMF thermal track-to-track between my three modules.

  Test method: I have a TB-50 which is configured to mux the signals of tension for a DMM. I connected each of the four DB-50 one cable of 176 pins to this block and collected with a PXI-4071 pressure readings set to 7.5 digits precision in the range of 100 mV and > 10 GOhm impedance. For most channels, it took several minutes for the voltage stabilize - or at least appear that it was to stabilize.

  I enclose three graphs. Note that the vertical scale is the same on each.

  Data that triggered this survey was collected with MUX1, via connector P2 to voltage. The magnitude was not quite the same-probably related to the phenomenon of stabilization time, but obviously the worst group of channels three multiplexer modules.

  The three modules were all bought at the same time (about 2 years ago), but had only limited its use in the first year or more. The three now have various 'mileage' based on my use. But MUX1 clearly behaves differently two other modules. The

  I changed my test conditions to spend 0.5 au via a higher resistance to thermal EMF less important. The PXI-2530 sheets indicate that thermal EMF must be less than 50 uV. In most of my measurements, it is. But not for MUX1!

  Any thoughts?

  Thank you

  Jeff

  Hi Jeff,

  You can check that all the three modules are PXI-2530, not PXI-2530 b (while, as the PXI-2530 b parts slightly higher thermal emf)?

  Specification of emf thermal 50uV of the PXI-2530 is a typical value, is not a guarantee of spec.  See a few channels higher than the spec is not a cause for alarm, but it shows that we must take account of this in our measurement error.  Note that the industry standard for the technical measure thermal emf is to close the relay, wait a few minutes and then take a measure of tension.  For example, if you scan through a switch faster than a relay per minute or so, the thermal emf will be less predictable and stable.  A single module performs worse at these low voltages is not indicative that this module is a failure, etc. the module is fine.  Unfortunately, the reed relays have more emf thermal relay of the armature, mainly because of the many layers of metal in a Reed compared to a frame (each metal junction is a source of emf if these metals are not the same).

  Thermal EMF is proportional to the temperature, it may be interesting to note the position of the chassis of the less powerful module.  Placing hottest modules (scanners, Ara, RF, etc.) will reduce the thermal emf.

• How can I work around a potentiometer that feeds a speed control using a SCC-AO10 module? Which wires I need to cut and where they connect to the SCC-AO10 module?

  I'm trying to circumvent a potentiometer that controls a blower DC motor. The potentiometer (10 kohm) has a wire greeen (+ 10V) a blue wire (ground) and a red wire (AI1 0-10 V voltage). These three sons feed a mounted ABB inverter which converts the 3 phases power somehow (220-240V) to a signal for the DC motor in the blower. I want to make a loop of speed control for the speed of the blower in Labview and I have to work around the knob. If I intend to use a PID that is equivalent to a speed measured at the speed setting, how can I get an output signal to my SCC-AO10 to the speed control? Asked me to use a switch that would allow to use potentiometer or the automatic control loop in Labview. Which wires should I cut the potentiometer and where I need to connect them on the SCC-AO10?

  Someone did this and the PID of a blower motor? Please help me if you can.

  «The promising (10 kohm) (10 kohm) potentiometer potentiometer has a wire greeen (+ 10V) a blue wire (ground) and a red wire (AI1 0-10 V voltage).» a greeen wire (+ 10V) a blue wire (ground) and a red wire (AI1 0-10 V voltage). »

  If you release the + 10V and the ground.

  The reader reacts to the voltage input (0 - 10V)

  Simply connect this red wire to your analog output module and ground (blue) on the floor of your module.

  .

• Is - what antialiasing does not work for the scxi 1141?

  Hello

  uses a chassis PXI-1052 with a DAQ 6052E for dynamic analysis.  I use a module SCXI 1140 cascading with a filter of 1141 , SCXI and 1120 SCXI D amplifier. My goal is to achieve low noise, filtered data. I have set up my gear so that data travels in SCXI 1120D ahead in parallel with the SCXI - 1141 and in parallel with SCXI 1140. In short, I want to test if the smoothing works. I generated a sinusoidal data with a frecvency of 600 Hz rates and sample of 1024 and I got an alias of 424Hz. The filter is disable. The alias does not disappear when I activate the filter with a cut-off of 500 Hz frecvency. What's wrong. What is antialiasing working for this module? My channels is set to traditional NI-DAQ title.

  Hi Avi,

  I'm having a hard time trying to reconstruct how samples are defined and how your signal is actually routing through material.  Is the 1120D on the front of the 1141 and then the 1140 is in the slot next to those?  You said there were many things in parallel and now I'm confused.  Thanks for the clarification!

• 6361 versatile usb data acquisition does not automatically detect the SCXI chassis/accessories

  versatile usb data acquisition 6361 will detect automatically SCXI chassis and accessories?

  Hello kdCMC,

  As far as I know that the SCXI-1600 USB Module is able to auto-detect SCXI Modules.
  This is also mentioned on page 11 and 12 of the following SCXI to start document:
  http://www.NI.com/PDF/manuals/373236m.PDF

  All data (including USB-variants such as the NI USB-6361) have only a 68 pin shielded cable (IO) between the DAQ hardware and the SCXI chassis.
  This cable does not auto-detect opportunities since it basically just "transfers analog and digital signals" between SCXI chassis and DAQ hardware.

  Is there a specific document that created the confusion on this subject?

• multiplexing of the strain gages with the scxi-1001

  I am trying to write a MatLab program that uses the C++ functions.  I managed in the collection of data of an extensometer, but I do not understand how to configure the multiplexing.

  I use a DAQ, SCXI-1600 in a SCXI-1001 chassis with 9 input modules 8 channel universal bridge SCXI-1520.

  I know that the hardware is possible to multiplex all 9 SCXI-1520 for the acquisition of data because we did it in LabView.  I have currently no LabView on my computer.

  My question is:

  How labview use C++ functions to implement this material to record 72 straingage channels.

  That's what my code looks like:

  Clear, clc
  rate = 100
  time = 1

  If ~ libisloaded ('myni')
  DISP ('Matlab: load nicaiu.dll')
  [notfound, warnings] = loadlibrary ("C:\WINDOWS\system32\nicaiu.dll",...)
  "C:\Program NIUninstaller Instruments\Shared\CVI\include\NIDAQmx.h",...
  'alias', "myni")
  end

  cards = 1
  Chans = 8
  taskh (1) = uint32 (1);

  % This is the C++ function called from MatLab-> int32 DAQmxCreateTask ('master', taskh (1))

  [a, b, taskh (1)] = calllib ('myni', 'DAQmxCreateTask', "master", taskh (1))

  chains of % for both channels 0 through 7 on each and SCXI-1520 cards.

  taskchans = {'SC1Mod3 / ai0:7 ',' SC1Mod4 / ai0:7'};

  samples = time * rate;

  chanName = ";
  minV = - 10F-4;
  Discharge = + 10-4;
  excitV = 3;
  gageFactor = 2.09;
  iniBrdgV = 0;
  nomGageR = 350;
  poissonR = 0.3;
  wireR = 0;
  scaleName = ";

  DAQmx_Val_Strain = 10299;
  10065 = DAQmx_Val_FromCustomScale;
  DAQmx_Val_QuarterBridgeI = 10271;
  DAQmx_Val_Internal = 10200;
  DAQmx_Val_Rising = 10280;
  DAQmx_Val_FiniteSamps = 10178;
  DAQmx_Val_GroupByScanNumber = 1;

  % creation of extensometer (virtual) channel

  [c] = calllib ('myni', 'DAQmxCreateAIStrainGageChan', taskh (1), tank (taskchans (i)),...)
  chanName, minV, discharge, DAQmx_Val_Strain, DAQmx_Val_QuarterBridgeI...
  DAQmx_Val_Internal, excitV, gageFactor, iniBrdgV, nomGageR, poissonR...
  wireR, scaleName);

  % set samplerate and number of samples
  for i = 1:cards
  [a, b] = calllib ('myni', 'DAQmxCfgSampClkTiming', taskh (i), cm, rate, DAQmx_Val_Rising,...)
  DAQmx_Val_FiniteSamps, samples)
  end
   
  Disable the trigger for the start of the %
  for i = 1:cards
  [a] = calllib ('myni', 'DAQmxDisableStartTrig', taskh (i))
  end

  % create variables to read data

  readarray1 = Ones (CARDS, Samples);
  readarray1_ptr = libpointer ('doublePtr', readarray1);
  arrayLength = samples;

  sampread = 0;
  sampread_ptr = libpointer ('int32Ptr', sampread);
  void = [];
  empty_ptr = libpointer ('uint32Ptr', Empty);

  Organization and reading raw data
  strain = ones (maps * chans + 1, samples);
  t = 0:1 / rate: time-1/rate;
  Strain(1,:) = t;)

  for i = 1:cards
  [readarray1, sampread, empty] = calllib ("myni', 'DAQmxReadAnalogF64', taskh (i),-1,-1,...)
  DAQmx_Val_GroupByScanNumber, readarray1_ptr, empty_ptr, sampread_ptr, arraylength);
     
  strain (chans * i-(chans-2): chans * i + 1, :) = readarray1;)
  end

  % Stop all tasks

  for i = 1:cards
  [a] = calllib ('myni', 'DAQmxStopTask', taskh (i));
  If a == 0
  fprintf (' slaughter task %s...) OK \n ", tank (j (i)));"
  on the other
  fprintf (' start task %s...) Failed \n ", tank (j (i)));"
  end
  end

  % Clear all tasks

  for i = 1:cards
  [a] = calllib ('myni', 'DAQmxClearTask', taskh (i));
  If a == 0
  fprintf (' task claire %s...) OK \n ", tank (j (i)));"
  on the other
  fprintf (' task claire %s...) Failed \n ", tank (j (i)));"
  end
  end

  It is the General form of my code.

  I tried to do one task per channel, but I can start only one task at a time.

  I tried to use DAQmxSwitchCreateScanList and DAQmxSwitchSetTopologyAndReset.

  -> but I don't know what the name of device for the switch.

  If anyone can explane how all these SCXI-1520 multiplex LabVIEW cards that would help a lot.

  Thank you.

  OK, I found the solution to this problem.

  The SCXI-1600 multiplexes based on which channels have set you up.  I simply add all 72 channels to the taskh (1) with the function DAQmxCreateAIStrainGageChan (...) then my samples are multiplied by the number of channels, I added.