PXI-9 specification

Does NI support the PXI-9 Trigger Management Specification? If not (what I actually see), is there any time frame when it will be available? Or maybe I just need to download some extension?
I got the latest software installed (VISA 5.4 & NIDAQmx 9.8), but there is no PXI-9 DLL module registered in the system. In my Registry I see just:
HKLM\Software\PXISA\Services\System Modules
HKLM\Software\Wow6432Node\PXISA\Services\Chassis
HKLM\Software\Wow6432Node\PXISA\Services\Peripheral Modules
HKLM\Software\Wow6432Node\PXISA\Services\Resource Managers
HKLM\Software\Wow6432Node\PXISA\Services\System Modules
There are no anticipated:
HKLM\Software\PXISA\Services\Trigger Managers
HKLM\Software\Wow6432Node\PXISA\Services\Trigger Managers
And obviously the system description file created by the PXI resource manager does not contain the [TriggerManager] tag.

NI supports the PXI-9 Trigger Manager specification with PXI Platform Services versions 4.0 and newer. What version do you have installed?
If you don't have it, you can download it here http://www.ni.com/download/pxi-platform-services-4.0/4353/en/

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PXI-5610 Specification

Hi,
Does anyone have NI PXI-5610 Up-Converter Specification? The link on NI web http://sine.ni.com/nips/nisearchservlet?nistype=psrelcon&sortby=localesort&nid=13478&lang=US&filter=... seems to point to PXI-567X specification.
Thanks.

Luyy,
Thanks for contacting National Instruments. This is correct, the 5610 is part of the 567X RFSG unit. Those specifications are the correct ones for that device. There are 5610 specific data in that pdf. Is there something in particular you are looking for?
Regards,
Kenn North
Senior Product Manager - Search, Product Data
http://ni.com/search

PXI-6608 specifications

Hi,
I have a question about the performance verification of the PXI 6608.
This is what I was able to perceive from the manual.
We have two modules:
CTR0: referenced to an external clock that has a minimum uncertainty of 0.75 ppb and generates a 400 s pulse to CRT1.
CTR1: is referenced to the internal 10 MHz OCXO and counts the number of cycles in that 400 s window: 400 * 10 MHz=4*10^9 . Any result different from this means an error.
Now to my understanding the performance verification is comparing the 10 MHz OCXO with the external clock. So by looking at the manual we have a uncertainty of 75ppb when the 10 MHz OCXO is on the slot 2: 0.75ppb * 10 MHz = +/- 0.75 Hz. BUT the performance verification assumes a tolerance of 0.1 Hz (10,000,000.1 < Hz < 9,999,999.9 Hz)
The calibration execute has the same approach as the performance verification,
Why does the PXI 6608 have a tolerance different from the manual?
Are we not testing the 10 MHz OCXO?

Hello,
In order to set the counter source to the timebase, you can use the the get/set/reset CI_CtrTimebaseSrc in order to set this in CVI. Please consult the DAQmx C reference Help for more information. Here are the functions if you can't find it in the help.
int32 __CFUNC DAQmxGetCICtrTimebaseSrc(TaskHandle taskHandle,
const char channel[], char *data, uInt32 bufferSize);
int32 __CFUNC DAQmxSetCICtrTimebaseSrc(TaskHandle taskHandle,
const char channel[], const char *data);
int32 __CFUNC DAQmxResetCICtrTimebaseSrc(TaskHandle taskHandle,
const char channel[]);
As for performing a loopback test to test its accuracy, this isn't the best way to do this because the source is creating a signal with relatively the same accuracy as you are reading in back on the same device. Knowing that this signal is accurate down to .7ppm, we need to apply a source for the counter that is much more accurate than this. First way to do this is to change the timebase source to the 10MHz clock like I mentioned above. The other way is to place the PXI-6608 in slot 2 so that it overwrites the 10MHz clock on the backplane. This 10MHz clock is used with PLLing the 80MHz clock that is normally used in counter tasks. Which slot do you have the PXI-6608 in? Could it be placed in this slot?
Jim St
National Instruments
RF Product Support Engineer

PXIe acquiring and disk streaming speed

Good evening,
I need to acquire and stream to disk the status of N.8 digital lines at 100 MHz clock, idest 100MBytes/sec data rate, in continuously mode (without data loss) for five minutes.
I've thought to a PXIe configuration with:
PXIe 6544 High speed DIO,
PXIe 1071 Chassis,
PXIe Controller with solid state H.D. option.
Is that configuration enough?
Thanks.
Natalino Roberto

Hello Roberto,
According to NI PXIe-6544 specifications, you should be able to achieve typical data streaming rates 400 MB/s for acquisition and 400 MB/s for generation. So, you shouldn't face with any issue from this side.
Does your application provide an host interface communicating with embedded application? If doing so, you may need to design your application according real time guidelines.
Let me know if you need help or additional assistance.
Have a nice day.
Matteo C. - Test Engineer

How can i find out the resolution and accuracy of PXI-6602 module?

I have a 32 bit 8 channel PXI-6602 counter module. PXI card is interfaced to PC with MXI-4 link. How can i find out the resolution and accuracy of this system.What is the maximum accuracy and resolution i will get from this system. Because optical signal to cmos conversion signal is given as a input to the counter.

Hi chandhu,
Were you referring to the accuracy of the count register or the timing clock?
PXI-6602 specifications can be found in the NI 660x Specifications. The resolution of the count register is, as you’ve noted, 32 bits. This corresponds to a maximum count value of 4,294,967,295. As long as all of the edges are in accordance with TTL specifications, the accuracy of the count register is 100%.
On the other hand, the PXI-6602 baseclock accuracy takes on the baseclock accuracy of the PXI CLK 10 signal. Again, this is all found in the specifications.
You may also want to check out the NI 660x User Manual – it contains a lot of details on the operation of these counter/timer devices.
I hope this helps. Please post back if you have further questions.
Ed W.
Applications Engineer
National Instruments

PXI-7854R: how many times can bitfile be loaded to FPGA?

How many times can I reload bit file to my FPGA PXI-7854R?
I found a related question/answer for 783x but I'd like to know the limitation for PXI-7854R, specifically.
PXI-7831R http://digital.ni.com/public.nsf/allkb/91DE0C3B7740C287862574D300646369

For additional "you'll never wear it out fodder": we use Xilinx FPGAs, so their documentation will be the real source of the answer.
http://forums.xilinx.com/t5/Spartan-Family-FPGAs/How-many-times-I-can-reprogram-my-Spartan-6-device/...
and, slightly more entertaining discussion on the matter:
http://forums.xilinx.com/t5/Spartan-Family-FPGAs/How-many-times-can-you-re-program-a-Spartan-device/...
I guess it's not really "official documentation", but it's the right answer. I couldn't find anything more substantial in the ~10 minutes I looked.
Cheers!
TJ G

When will a Thunderbolt PXI chassis be available?

10mbps interface to PCI!

Hello There,
I am unsure about what you are referring to. The PXI Platform already provides up to 132 MB/s system bandwidth and is based on the PCI platform specifications. Moreover, the PXI Express can deliver up to 1 GB/s per-slot dedicated bandwidth and up to 7 GB/s total system bandwidth. Below is a link that explains more about the PXI and PXI Express specifications:
What is PXI?
http://zone.ni.com/devzone/cda/tut/p/id/4811
Regards,
Roman Sandoval | National Instruments | RF Systems Engineer

Is there any limitation for PXI 5670 to generate QPSK signal?

Hi,
I would like to select PXI 5670 to generate the QPSK signal in my system. How does is it make the QPSK modulation?As I understand, QPSK modulation would need to have two AWG to generate the I and Q signal. See below:
But PXI 5670 only integrated one AWG (PXI 5421). So how does it make the QPSK modulation?
Do I need to download the user−specified baseband IQ waveform into the memory first,then playback it to generate the IQ signal and then upconvert it to the desired QPSK signal? if yes, the playback time will be limited by the onboard memory size. Even if I select the one of 256 MB of onboard memory , it can only 1.28 seconds of waveform data at the default sample clock rate of 100 MS/s. Does it means the QPSK signal can only apear within 1.28 seconds? That's definitely not enough for me.
I am not sure if my understanding is correct or not. Any reply is appreciated.
BR,
Ivan Chen
Solved!
Go to Solution.

Hello Ivan.Chen,
This is correct given the PXIe-5611 performs the complex modulation and direct upconversion in the physical analog domain. Typically, you will still be generating your waveform in software based upon I and Q however. The real I waveform will be generated on channel 0, and the real Q waveform will be generated on channel 1. The I and Q analog waveforms will then be modulated in a quadrature fashion and generated at the appropriate RF frequency.
The fundamental difference between the PXI-5670 and PXIe-5673 is that your the PXI-5670 eventually needs to received a waveform at full rate (100 MS/s) which has already been complex modulated while the PXIe-5673 only requires two real waveforms, I & Q, which can be at streamed to the device at a decimated rate since the onboard signal processing supports interpolation. This allows the PXIe-5673 to be an ideal streaming platform. It is also much faster in regards to tuning, and is capable of a 4x instantaneous bandwidth improvement - the PXI-5670 is 20 MHz, while the PXIe-5673 is > 100 MHz in bandwidth.
Check out the specifications for the PXIe-5673 for more detail on the overall device, as well as the PXIe-5450 specifications for more detail on the onboard signal processing capabilities.
Chris Behnke
Sr. RF Engineer
High Frequency Measurements

DAQmx - Signal Routing Problems and Questions - PXI

Hi,
First of all, this is a repost of my original post on LabVIEW General, which got no reply at all maybe because of the wrong category. So I'm reposting this same post in the hardware category.
I'm using a PXI-1042 chassis with PXI-8176 controller. I tried to synchronize two PXI-6031E multifunction I/O cards in LabVIEW 7.1 with the LabVIEW example "Multi-Device Synch-Shared Timebase-Cont Acquisition" but received the following error:
==================================================
Error -89125 occurred at DAQmx Start Task.vi
Possible reason(s):
No registered trigger lines could be found between the devices in the route.
If you have a PXI chassis, identify the chassis correctly in MAX, and make sure it has been configured properly. If you are using PCI devices, make sure they are connected with a RTSI cable and that the RTSI cable is registered in MAX. Otherwise, make sure there is an available trigger line on the trigger bus shared between the devices.
Source Device: PXI1Slot4
Destination Device: PXI1Slot7
Task Name: _unnamedTask<3>
==================================================
I already specified my chassis and controller type under MAX, and noticed that when I clicked on the "Chassis 1 (PXI-1042)", the information window list all PXI slot as "UNKNOWN/EMPTY" (a screen shot is attached). Maybe that's why LabVIEW cannot find a route between the cards? Also attached is the PXISYS.INI file on the PXI.
I also tried to route the link manually using the DAQmx Connect Terminals VI but got the same error when I tried to route the PXI_Trig0 between two cards.
Also some questions regarding DAQmx:
1. With the DAQmx Connect Terminals VI, is it true that we can no longer make routings to RTSI lines "manually" as in traditional DAQ Signal Routing VI?
2. Is it possible to route, say, a constant low or high to a RTSI line like we could with the old traditional DAQ VI?
Software info:
MAX version 3.1.0.3021
LabVIEW version 7.1
NI-DAQ 7.1 (later upgraded to 7.2 and got the same results)
P.S. Using traditional DAQ VIs is no longer feasible because I just added some cards that supports only DAQmx.
Any reply is appreciated.
Thanks,
Dan
Attachments:
max_screenshot.jpg ‏52 KB
PXISYS.INI ‏2 KB

Dan,
It appears that the pxisys.ini file that you're using is an older format (version 1.0 of the PXI Specification; the current version is 2.1). When you configure your PXI system in MAX by identifying your controller and chassis, MAX will create a new pxisys.ini file that adheres to the current version of the PXI Software Specification. Since MAX does not appear to be doing this, there are a few things to look for:
1. Is the pxisys.ini file read-only? If so, clear the read-only attribute, and try again.
2. Are you grabbing a pxisys.ini file from another source, after identifying PXI system components in MAX? If so, you do not need to do this, because MAX will create and manage the file for you.
3. Are there multiple pxisys.ini files in your search p
ath? The pxisys.ini file should be located in your folder (for example, c:\windows). If there are multiple pxisys.ini files, remove those that do not reside in the folder.
Try these things and let us know what you find.
Thanks,
Eric Gardiner
Senior Software Engineer
National Instruments

NI TB-2605 terminal board to NI PXI-2503 relay card pin GND interconnect?

I am using the NI PXI-2503 relay card and the NI TB-2605 terminal board to impliment some interconnects My question is on the terminal board there is a GND terminal listed on pin GND. What electrical pins or internal backplane or relay card terminal does this "point" interconnect to?
Solved!
Go to Solution.

Figuring this internet stuff out is not for the feignt of heart....!
First....thank you for your initial effort.
I am a test equipment engineer.
As you probably know, I am confused with the threads through the documentation. I am looking at the figures provided on the TB-2605 Isothermal Terminal Block Installation Guide, Figures 1, 2 and 3. I am also looking at the NI PXI-2503 Specification pdf figure 1.
There is no mention of a GND connection connected to the Relay card Figure 1. This GND may go into the PXI chassis backplane and mate to the power cord neutral line or some other connect like that, but I cannot tell.
I would like to peice together a guide to my manufacturing people as well as to my software people how this thing works using software to select 1 x 48, 2 x 24, and dual 2 x 12 switching modes when I specify the use of this fine equipment for solving our test needs.
I beleive that I am close, but a very few questions remain.
Thank you for you excellent approach to "looking" into the answer for my question. Any additional insite to GND paths is appreciated.
Eugene Gillingham

Calibration of PXI-5695 RF Attenuator

NI PXI-5695 Specifications, RF Attenuator (NI document 375125C-01) indicates a calibration interval 1 year.
1. Is there a published National Instruments calibration procedure for the PXI-5695 RF Attenuator?
2. The PXI-5695's that we have purchased did not come with calibration data or a calibration certificate. Is there an option to purchase the PXI-5695 with calibration data?
Thanks,
Darrow Gervais

Hello Darrow,
There is not a published calibration procedure for the PXI-5695 RF Attenuator. You would need to send in your PXI-5695's to be calibrated by National Instruments. Here is NI's Calibration Services page: http://www.ni.com/services/calibration.htm. If you choose to have your device calibrated, you can choose from several types of calibration reports: http://www.ni.com/services/calibration_compare.htm.
For new devices, NIST certificates are kept in an online searchable database here. National Instruments products are calibrated at manufacturing, so a newly purchased device will be NIST traceable. The certificates are searchable by the serial number of the device. The following link has more details on NIST Traceability Certificates: http://digital.ni.com/public.nsf/allkb/3459F092CEDE62C6862575A0006900F6.
Best regards,

PXI-2503 SFP not showing correct COM"X" number?

Hi,
I have some PXI-2503 that I am using for the first time. Using it in 2-wire 24x1 mode
1) It seems to me like the SFP is always showing "COM0" whichever channel is used. My understanding is that it should be routing signals via COM0 for chan 0-5, COM1 for chan 6-11 COM2 for chan 12-17 etc and measurements show that too. But in the SFP it always indicates routing via COM0?
2) Question; is the pinout number of the TB2605 screw terminals, the asme as the numbers for the pinout of the PXI-2503? It seem to be so. Can someone confirm?
Thanks
Solved!
Go to Solution.

Hi janaf
1. Using the 2-wire 24x1 topology you are multiplexing 24 inputs to a single line. So you should only have one Common port. I guess the schematic on page 3 in the PXI-2503 Specifications has you confused. Please note the BC01, BC02 and BC03 relays in the schematic. If you switch to the Relays tab in the Soft Front Panel you will see that they are all closed in the mode your are using, meaning that signals from all inputs can reach com0.
If you change the topology to "2-Wire Dual 12x1 MUX" you will notice that bc02 turns open and in the Schematic tab you will now have an option to change bank in the top right corner. In this case Bank 0 uses com0 and Bank 1 uses com2
2. Please see this document, the pinout changes with topology
Best Regards
David
NISW

PXI 5105 true bandwidth

The PXI-5105 specification states:
60 MHz real-time sampling
60 MHz bandwidth
Clearly the two specifications are not compatable. What is the true PXI-5105 bandwidth?
Solved!
Go to Solution.

Hello Bob,
Thank you for bringing this issue to the forums. The reason for this statement, "60 MHz Analog Bandwidth," is to tell us that we have good signal intergrity up to 60 MHz, and hence our 3dB point is not at 30 MHz (allowing us to sample at 30 Mhz without significant attenuation). According to the Frequency Response graph below, when we have our Antialiasing Filter, we have a bandwidth of 24MHz and otherwise we can sucessfully sample up to a bandwidth of 30 Mhz. Also, you can see our Full Bandwith of 150MHz.
This is found in the 5105 Manual: http://www.ni.com/pdf/manuals/374403g.pdf
Thank you,
Vimal Fernandez
Applications Engineer
National Instruments

Has anyone performed a correlation study between a PXI-4461(or PCI) vs the Audio Precision 2722?

Hello,
Wondering how you would configure the input and output connections on the 4461 (psuedo/differential) and correlate that to the 2722 (balanced/unbalanced, floating, etc).
I'm mostly interested in comparing voltage levels.
Thank you in advance

Hello dmf,
I am by no means an expert on pro-audio equipment, but I can tell you about the PXI-4461. First off for a description of pseudo differential inputs you can look at this KnolwedgeBase article: What Is a Pseudodifferential Input?
As my understanding of balanced inputs goes, these signals consist of two signal wires and a ground reference. The signals lines carry the same signals, but one line is inverted (180 degree phase shift). This is useful because at any point you can re-invert one of the signals and combine them so that any noise you picked up as a balanced signal is now canceled out. In general this is used to reduce noise caused by traveling through cabling. I believe that most audio devices that support balanced inputs convert these balanced inputs into unbalanced signals early on in an input stage--it is rather rare that an audio device does any amplification/filtering etc. on a fully differential signal.
Since many of National Instruments devices are intended to serve a wide variety of needs we do not specify in terms of balanced or unbalanced inputs since those are industry specific terms. However, when compared to this definition, the inputs on the PXI-4461 are unbalanced in that there are only two wires for each input, + and - (or + and reference if you use pseudo differential). That being said, I believe that most audio stores have boxes that you can buy that convert balanced to unbalanced signals or vice versa. If you want to use balanced signals to avoid cabling noise in your hardware setup then all you'd need to do is get one of these boxes to use for input and output with your PXI-4461.
This is a rather general comparison focusing on the topics that you've brought up. It may be helpful if you can re-phrase your question to ask about a particular capability of the PXI-4461 rather than a straight comparison. As far as the input signal type I don't see much of a difference between the two (assuming you get a balanced to unbalanced converter if you want to use balanced inputs--these are relatively inexpensive). As mentioned in the PXI-4461 Specification sheet, the input and output ranges are +/- 10 V and the rates are 204.1 kS/s. If you need more specifications like that I would suggest looking at that pdf, but if you'd like to describe your application a little more it may be easier to provide you with the information you're looking for.
I hope this helps, and please feel free to post back if you need further advice.
Cheers,
Brooks

Switch Software management

Hi,
I am in the process of developing a System to monitor the components on the Printed circuit boards in oven,It s a basically a failure analysis of the components such as C's,Resistors and Capacitors.
The following is an overview of my test system
The test system should monitor the components on the PCB 1 year.
I would like to measure the Resistances and Capacitances using an LCR meter to identify the failure. Failure of the Resistor is identified with a Open circuit and a failure of the Capacitor is identifed with a short circuit/open circuit.I have 420 capacitances to be measured and I would like to automate the measurement using NI Multiplexers.
I have to monitor the first Capacitance (C1) for 3 mins ( which would be connected to the first input of the multiplexer) , followed by second for 3 mins and so on. Once all the 420 capacitances are monitored , the loop should start again from Capacitance C1. I would like to know how to program the NI 's switches. Could someone please suggest me how to go ahead with this.? Is Labview good enough to automate the switches or should I go ahead with a switch management software ? Can you please explain in detail as am a newbie to Labview ? Looking forward to your response. Thanks in advance
Solved!
Go to Solution.

Hello there, 2nF approaches the territory where we need to consider the parasitic capacitance in the cabling/modules/etc. For example, the multi-conductor LFH-200 cable that plugs into the PXI-2575 specifies 25pF/ft nominal parasitic capacitance with a single-ended signal, versus 15pF/ft nominal with a 2-wire signal. There's also internal capacitance from the switch, your test harness (anything that plugs into the LFH-200 cabling), etc. With a 1-wire system, all DUT capacitor minus terminals are connected together all the time, which means you have a bunch of additional coupling locations for additional stray capacitance... wherever you have a stray path from any of the minus leads back to the particular channel under test. For example, you could have coupling back through each capacitor's power supply back through the DUT's power supply and then into your measurement, etc. With a 2-wire system, both the plus and minus are switched, which greatly reduces the number of venues for stray parasitic capacitance. You might be able to get away with a 1-wire system, but my concern is with 420 channels your parasitic capacitance could approach your DUT capacitance. If the parasitics are constant, you could compensate out the error, but I still recommend a 2-wire solution.
NI HW definitely allows synchronization between DMM/Switch using external triggering, but in your case I recommend just using SW API calls: "switch: connect CHn" "dmm: take measurement y times" "switch: connect CHn+1" etc. Synchronization is a method to measure as fast as possible, whereas you're taking measurements over a period of hours with a required period for each DUT... with HW synchronization, you can't implement a "wait t seconds" (unless you used additional external hardware, e.g. 555 timer to add delay, but this isn't practical when there's a perfectly good SW API).
Note that if you're not comfortable with LabVIEW programming, but do know text-based programming, NI-Switch has a full-featured C++ API. NI-Switch includes numerous examples in both LabVIEW and C++, and of course the community here can offer tips/hints/advice if you run into coding trouble.
-John Sullivan
Analog Engineer

PXI-9 specification

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