Temperatures corresponding to voltage ranges with the PXI-4351/TC-2190

Using a PXI-4351 and TC-2190 with a K-type thermocouple, what temperature range do the voltages (+/- 625 mV, 1.25 V, 2.5 V, 3.75 V, 7.5 V, and 15 V) correspond to? How much accuracy does each different range of voltages have? All I could find was that to get improved accuracy, use a range of 2.5 volts or less (document #1X0F7L3E). Also, will using several channels at vasly different temperatures (ie. room temp. and several hundred degrees) affect which range I should select?

The full temperature range of a K type thermocouple from -270C to 1370C represents a voltage range from -6.45mV to 54.8mV. If the only sensors you are using are thermocouples then you should choose the smallest range. The 4351 applies one gain setting to all channels, so the only reason you would want to use anything but the smallest range would be if you have other types of sensors with larger voltage swings. You can find voltages for any thermocouple at any temperature at the link below.
Regards,
Brent R.
Applications Engineer
National Instruments
http://srdata.nist.gov/its90/menu/menu.html

Similar Messages

How do i read out the actual voltage range of the daq board as calculated by labview based on my input voltage range

I am somewhat new to DAQ so I hope I describe this well enough, but I have encountered a requirement for my VI that I am not sure how to obtain from LabVIEW. It is my understanding that when using a DAQ board (I'm using a PCI-6034 E) you can specify the voltage range you expect from your measurements, and then the software calculates the actual voltage range it will be measuring to ensure that you get the best resolution in your range that you can given the voltage step size, etc. of the equipment. I know how to extract the voltage input that I enter into the virtual channel, but I was wondering how I can extract the actual voltage range that the hardwar
e/software is using based on its own calculations from my input. Can anyone help me with this?

If I understand correctly, you want to retrieve the actual gain value (and, therefore, usable input range) used by your DAQ card for a particular measurement.
I think there's a good KnowledgeBase entry with your solution entitled "Programmatically Determining the Gain Used by a DAQ Device". Here's the URL:
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/c93d3954ec02393c86256afe00057bb0?OpenDocument
Regards,
John Lum
National Instruments

How Do I Get the Best Range with the Express?

What settings should I use to get the best range with the express? What Radio Mode, Multicast Rate and Transmit Power should I use? What is the estimated area that this will cover?

+What Radio Mode+
802.11g only would be a good compromise. Here I am assuming when you say that you want the best range that you do not care if better range means lower network speed. Everything in wireless is a trade off. You cannot gain something without giving something else up in return.
+Transmit Power+
100%
+Multicast Rate+
No effect on range, but a good idea to use a lower setting in general
+What is the estimated area that this will cover?+
Not possible to predict without knowing a whole lot more about how many obstructions will be in the signal path, what they are, the construction of your home, other wireless networks and cordless phones around you, etc. and many other factors. Please tell us what you are trying to do with as many details as possible.
Message was edited by: Bob Timmons

I have a 2008 airport extreme, will I get greater range with the new version?

I have a 2008 airport extreme, will I get greater range with the new version of the airport extreme?

I have had both models, and frankly notice little if any difference in range, likely because the broadcast power of wireless routers is set by law, and just about every router is running at 100%.
The dual band feature of the newer model will allow devices that are in close proximity to connect using the 5 GHz band, which runs 2-3 times faster than the 2.4 GHz band.
If you need greater range, you will likely do better by adding something like an AirPort Express to "extend" the wireless signal for greater reach.....rather than simply replacing one AirPort Extreme with another.
Another option....if you opt for the new AirPort Extreme....would be to use it as your "main" base station and use the older Extreme to "extend" the wireless signal.

Filling a range with the same date in Numbers '09

I know if you type a date in to a field and then drag the corner it will fill successive dates, but is there a way to fill a range of cells with the same date so I don't need to retype them each time?

Create a pattern of what you want, then do "fill"
Enter the same date in two or three cells, in a row or column, then drag to fill the range. Numbers should recognize the pattern you created and continue it.

How do I configured the PXI-4351 to read thermocouples with Labwindows?

Hi,
I have a PXI-4351 datalogger and am trying to configured it to read thermocouples, the terms on the functions don't make any sense since it asks for a transducer group...thermocouples are not transducers. Anyone has a software reference for this...the online help is not enough, i guess i need information on how to read a thermocouple. HELP!!!

Hi,
My question is, why do you think Thermocouples are not transducers? In the application with NI 435x, thermocouples are considered transducers just like thermistors, etc.
1. You may want to take a look at examples here:
C:\VXIpnp\WinNT\NI435x\examples\CVI
If you are talking about the NI435x_Configure function, you can find the elaborate help on the function by going to Start>>Programs>>National Instruments 453x>>NI435x Help.
Please do let me know if you need more help.
Sincerely,
Sastry Vadlamani
Applications Engineer
National Instruments

Searching for a cable terminal block combination that works with the PXI-2568

Hi,
Has anyone figured out a cable-terminal block combination for the PXI-2568. I have a hard time finding something useful and would appreciate any part/supplier information from users who purchased a PXI-2568. Thanks.

If you download the specifications document for the PXI-2568 from NI's website there is a section close to the end that talks about cabling and accessories. The PXI-2568 uses a standard 62 pin D-sub connector. The cable and terminal blocks for this connector can be found at large electronic suppliers. I hope this helps and have a great day!
Bryan Snarr
Application Engineer
National Instruments
Bryan Snarr
Field Engineer
Northern California
National Instruments

Help with portforwarding, how do set a range with the M1424-WR Rev.F?

Am trying to portforward Call of Duty: Black ops 2, and it's giving me a headache. Portforward.com says the REV.f won't forward ports, I can only DMZ( which I obviously won't do), so I'm following the M1424-WR instructions(http://portforward.com/english/routers/port_forwarding/Actiontec/MI-424-WR/Call_of_Duty_-_Black_Ops_...
Since I only have an input box( the instructions for the different model gives two input boxes to set range) I simply copy pasted " 4379-4380", am unsure if it recognizes it as a range.

heizenbrg wrote:
Am trying to portforward Call of Duty: Black ops 2, and it's giving me a headache. Portforward.com says the REV.f won't forward ports, I can only DMZ( which I obviously won't do), so I'm following the M1424-WR instructions(http://portforward.com/english/routers/port_forwarding/Actiontec/MI-424-WR/Call_of_Duty_-_Black_Ops_...
Since I only have an input box( the instructions for the different model gives two input boxes to set range) I simply copy pasted " 4379-4380", am unsure if it recognizes it as a range.
Why not just put in 2 port forwarding rules? one for 4379 and the second for 4380. just make them a user defined protocol.
I saw the comment at portforwarding.com - sounds ridiculous to me - The MI424-WR_Rev.F will not allow you to forward enough ports, to run Call of Duty - Black Ops II
Even if they don't allow a range there can't be a reason they don't allow a seperate rule for each port.
Here's the link to the user manual for the router
http://support.actiontec.com/doc_files/MI424WR_Rev._E&F_User_Manual_20.10.7_v1_GPL.pdf
you need section 6.4 pretty useless manual too

When using logic's arpeggiator, how do I get it to resart its cycle from the root of a new chord instead of resuming its cylce in the same range with the new notes?

I'm arpeggiating A minor over a number of octaves and I want to switch to D minor before the cylce is over. However, I want the d minor to start from the lowest note that I'm playing as if it were a new cycle. What it does instead is continue the cycle, but uses D,F,A instead of A,C,E.
If Logic's arpeggiator is not capable of doing this, can anyone recommend a third party arpeggiator that can? (hopefully cheap/free)
Thanks.

You need to make sure to give a clean break between the two chords, if any notes are not completely severed between the chord changes the pattern continues from the first chord. Kind of how in a synth when set to legato it doesn't re-trigger the envelope if the notes run together.

Using MIO-16XE-10, I am trying to relate per gain setting the resultant actual voltage range.

I have tried to find the conversion table for gain setting and resultant voltage. I am a programmer, and am having trouble understanding the relationship, or better yet, an algorithm, so I can programmably set a gain, based on the current voltage returned after a measurement. The idea is, to get the most reliable resistance measurement by assuring that the current measurement taken with a specific gain setting, is not taken on the lower 1% of that gain.
bookieb

Hi Bill:
Thanks for contacting National Instruments.
The best way to use the most appropriate gain is to set the voltage range of the incoming signal and let the NI-DAQ driver choose the best gain to apply for that range.
The DAQ card has some predefined gain settings which the NI-DAQ driver selects from depending on the input limits.
To find out what input ranges correspond to what gain, please refer to Appendix A Specifications of the E Series User Manual. Table on page A-2 shows the relationship between the input signal ranges and the channel gain that the NI-DAQ driver chooses.
I hope this helps. Please do not hesitate to to contact me back if you need additional information.
Re
gards,
Bharat S
Applications Engineer
National Instruments
Penny

How can I programmatically change the voltage range settings in a DAQ Assistant

Hi,
First post here.
I need to be able to change the voltage range properties of a daqmx DAQ Assistant based on user input. My hardware, an SCXI-1102C does not allow changing this property on a running task, so I'd like to either set the analog input voltage range before the DAQ Assistant activates, or pause the DAQ Assistant immediately after it starts, set the values and then resume.
I don't know how to edit the task ahead of time because the DAQ assistant creates the task when it runs, and there is no task before that.
In the attached picture, I have a conditional section, set to run only if the while loop iteration is 0. I take the task from the Daq assistant, send it to a stop task vi, set the property, and then send the task on to the start task vi. I can watch it run with the debug light on, and everything seems to work correctly, but on the second (and all the other) iteration of the loop, I read out AI.Max and it seems like the DAQ Assistant has re set it back to 5V. Can anyone see what is going wrong here?
BTW, this is continuous acquisition and the code does not produce error messages when it runs.
I did come across a similar question that someone posted here back in 2006, but his question was specifically aimed at a Labview API (VB, I think), and not an actual G solution.
Attached are the actual vi in question and a png image of the block diagram.
Thanks!
Ruby K
Solved!
Go to Solution.
Attachments:
Labview_question.PNG ‏14 KB
Sample_AIV.vi ‏91 KB

First, if you want to start getting beyond the basics with DAQ, you are going to have to stop using the DAQ assistant and do it with lower level DAQmx VI's. There are hundreds of examples in the example finder. You can even right click on the DAQ assistant and select open front panel. That will create a subVI that you can open and see what is going on behind the scenes. Do it. I think you'll find the DAQ task is being recreated on each (though I'm not 100% of how the settings are established or maintained in each section of that subVI).
The second problem is you have a bit of a race condition on iteration 0. Those two DAQ property nodes are running at the same time. So when you read the AI.Max, it may be happening before or after the AI.Max is set in your case structure.
Third, make sure you wire up your error wires.

Aquisition of a voltage Signal with PXI 6713

Hi.
I want to make voltage aquisition with a PXI 6713 card. I take the Channels ai16 to ai33. The voltage at the clamp is 3.886VDC ( measured with a DMM ). When i measure the voltage and calculate it into a current ( see my applikation atteched ) the result is something between -10 and -24mA?!?!?
Are the settinges in the DAQmx Express-VI "analog voltage aquire" wrong or could it be another Problem?
My settings are:
RSE
voltage measuring from 0 to +8VDC
N Samples
I hope of yous Answer.
Thanks
Attachments:
analog_voltage_aquisition.jpg ‏33 KB

Is it a trick question??
First of all, Looks like you mentioned the card wrong PXI 6713 is an AO card, without any AI channels
Which card are you using??
Are you connecting a 390 ohm Resistance on your connector block to convert current signal to Voltage equivalent?? ( Sounds like you are not )
Are you measuring the Voltage correctly in the first place??
if you are not, check if the signal is connected correctly for RSE mode
Hope this Helps
Regards
Dev
Message Edited by devchander on 07-28-2006 07:35 AM

Measuring digital signals coming from the HSDIO (PXI-6542) with the DMM (PXI-4070)

Hello,
in attachment you can find the program I'm using for my measurement: I'm generating and acquiring digital signals with the PXI-6542 and at some trigger point of one of those digital signals I'd like to capture the measured values on a plot with the Digital MultiMeter (PXI-4070).
It does work if you configure the generation repeat mode as continuous, but if you do have a finite repetition (repeat count is 1) it doesn't react on the trigger, as if it can't find a trigger. On the other hand, if you have a finite repeat count of 30 or more it does react and triggers correctly again.
First I though it had something to do with autocalibration before the measurement takes place, but If you do a highlight execution (stepping through the program) it looks like it measures before the generation session is initialized.
Is there a way to measure correctly when the repeat count is only 1?
Thanks in advance,
Jürgen

Hey Jürgen. I apologize that you haven't gotten an answer yet to your post. I looked at your code and had some questions. What is the source of your trigger to your DMM? I see that you're exporting the data active event to PFI1, and your comments indicate that PFI1 and PFI2 are connected to give you a start trigger for your digital acquisition. Exporting the data active event with a finite or continuous pulse should only give you a single edge per run, though - you wouldn't get a pulse each time. Is your trigger coming from a data line? I didn't see any line in your included data that would indicate a single pulse.
The other thing that I noticed is that you've got no timing dependency between your HSDIO code and your DMM code - they're in parallel with each other. Thus you could get different results run-to-run, since it's not deterministic as to which parallel "thread" that LV will start on first. LV may switch back and forth several times, but let's say that LV reaches the HSDIO Start command before reaching the DMM Start command - in that case, the HSDIO device may finish it's entire operation before the DMM ever starts looking for a trigger, and thus never get the trigger at all. I'm not sure why this would explain why you're seeing the finite case work and the continuous case not, but I wanted to point it out because it could bite you down the road.
I hope some of this this helps get you going in the right direction. I'd also suggest posting HW-centric questions in the appropriate form. There are Digital forums and DMM forums that might help you reach people that will be more familiar with your particular hardware.
Chris

PLL with the Ni 5411 Arb and PXI Star

I am trying to PLL the NI 5411 Arb with the PXI Star, but I have found no documentation indicating how to do it and it does not appear to happen automatically like some other devices. I currently have a 6608 timing card in the PXI Star Slot.

The PXI-5411 is capable of Phase-Lock Looping with the 10MHz Backplane clock and is capable of receiving a trigger signal from the PXI Star Trigger line. However, the PXI-5411 is not capable of driving the PXI Star Trigger.
For more information abotu how the PXI-5411 uses the PXI Trigger Lines, see the "RTSI/PXI Trigger Lines" part of "Chapter 2 - Arb Operation" in the User Manual of the board (linkes below).
NI 5411 User Manual
The Example program attached below (written under LabVIEW 6.1) shows how to synchronize two NI 5411 boards by first Phase-Lock Looping (PLL) their internal clocks with the 10MHz Backplane Clock provided by the chassis, and then sending a trigger line from one 5411 (the master board) to the other (the slave board).
If you want to receive the PXI Star Trigger as the Star Trigger, you will need to use a PXI board capable of sending a signal to this pin. The only NI PXI boards capable of sending a digital trigger pulse over the PXI Star Trigger line are the PXI-5112 (High Speed Digitizer) and the PXI-7344 (Motion).
The PXI-6608 board is not capable of driving the PXI Star Trigger line, however, if you install the PXI-6608 board in slot 2 of the PXI chassis, it will override the 10MHz clock signal provide by the PXI chassis, with the onboard OCXO 10MHz signal provided by the board itself. The PXI-6608 provides a 75 ppb accuracy 10MHz clock, that replaces the aproximately 50 ppm accuracy 10MHz clock provided by the PXI chassis. By overriding the 10MHz clock with a better accuracy one, the PXI-5411 boards will do PLL using a better reference clock.
The only device that PLL automatically with the 10MHz backplane clock are the PXI-6115 Simultaneous Sampling boards.
See related links for more information.
Hope this helps,
Claudia Lorente
Applications Engineer
National Instruments
http://www.ni.com/ask
Knowledge Base 2S2BFCQ7 : PXI Devices That Can Send and Receive Star Triggers
About Your 6608 Device
Knowledge Base 2NFGGQAL : OCXO Stability On The PXI-6608 Counter/Timer
Knowledge Base 2CCF38PQ : Accuracy Problems when I Drive the PXI Backplane Clock with a PXI-6608
Attachments:
5411_Synchronize_Generation.vi ‏229 KB

Why does it take so long to clear a task (with DMA transfer) using the PXI bus?

I am migrating a system which used to use a PCI-6133 (8 channel simultaneous AI) and PCI-6733 (8 channel AO) to one that uses a PXI-6133 and PXI-6733 mounted in a PXI-1033 chassis.
In general, things seem to work (synchronized AI/AO running near the maximum rate on both devices), with the one exception that clearing an AO task on the PXI-6733 takes forever (on the order of 20-30 seconds).
Even when I try the sinewave generation for the PXI-6733 in the MAX test panel it takes the same amount of time to stop the task. If I switch to using interrupts as the transfer mechanism, it stops immediately.
I tried using the interrupt transfer mechanism on my more demanding set of synchronized tasks, but that does not produce the right behavior (even though it does not give any errors).
Is there any trick (or better diagnostic) to help get my tasks working with DMA under PXI that used to work fine on PCI?
Thanks in advance!
Solved!
Go to Solution.

Hi Patrick,
I'm using a PCIe-8361 controller. The computer is a Dell T5500 workstation running Windows 7 x64. I see the problem every single time I try to clear a task running on the PXI-6733, including my example using the Measurement & Automation test panel (from the very first time I try the Sinewave Generation onward). I can try other parameters in the test panel, but I don't need to adjust anything from the defaults (e.g., Rate = 1000) to get the behavior. I will also try installing the PXI chassis in a few other computers we have here just to confirm that it's not computer specific. From your line of questions I can at least gather that there's nothing obvious (like a known bug with the PXI-6733) and that I should expect this configuration to work.
Thanks for your help and I'll post any other findings I obtain.

Temperatures corresponding to voltage ranges with the PXI-4351/TC-2190

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