Pxi 4070 input impedance

I am trying to modify the input impedance of the pxi 4070 dmm with the NI DMM property node. When I set the input impedance to greater than 10 giga ohms, I am getting an error outputted after running niDMM Configure Measurements Digits.vi. The signal that I am measuring is 5V, so I should be able to use the 10 giga ohm input impedance. I set the niDMM Configure Measurements Digits to autoscale. Could this be an issue that the pxi-4070 is not allowed to have its input impedance changed when the dmm is set to autoscale?

You are correct. When the range is selected, the API automatically selects the input impedence. If you need to do this programmatically based on the measurement, then you could use a case structure that checks the range being used and then sets the input impedence based on this. Do you know if the value you are trying to read at the time would set the range to a value that is compatible with the input impedence?
Thanks,
Sean Newton
Applications Engineering Specialist - Semiconductor Test
National Instruments

Similar Messages

Pxi 4070 protection

Hello,
I have a PXI 4070 DMM card, and I set the voltage measurement range to 1V. What happens, if the input gets 15V? Will the card be damaged, or is there any protection against higher voltages?

The PXI 4070 does have input protection that is designed to protect the device from overload conditions. In the NI Digital Multimeters Help there is a section called Handling High DC Voltages which says that the input protection will engage when the signal exceeds about 15V when on the 10V range or lower for the PXI-4070. The behavior is that the input will change and look like a constant current.
The input protection circuit will protect your board from damage however I would not recommend designing a test that would rely on this if you can avoid it. It will not damage the PXI 4070 but it will take a little time to recover from this overload state before you can continue to make low voltage measurements. There is a caution about regularly relying on the protection circuit if you have a switch in your system because there will be current transients that can degrade the lifetime of your switch.
Steve B

NI 6509 PXI TTL Input Impdeance

I have a requirement to measure a TTL logic signal with a 5.1K ohm load. The specification for a PXI version of the board has high input impedance as a default condition. What is the actual impedance and can I just put a 5.1K ohm resistor across the inputs? Are there pull up/down resistors like the PCIe version? Can the default be changed?
John Anderson

I am not expert for this board. But the manual states that the inputs are in high impedance state after reset only (as far as the "non-e" version is concerned). This means that the input does not present a load to a signal line. In this state, however, you cannot receive any input signals.
After reset, you may configure the inputs as pull-up or pull-down. In a pull-up configuration, the pull-up resistor will be 4.7kOhms typical, in the pull-down configuration it will be 47kOhm typical. Concerning line impedance you have to imagine that the impedance between Vcc (where a pull-up resistor is tied to) and GND (where the pull-down resistor is tied to) is supposed zero, so the signal source will "see" an input impedance of 4.7kOhm or 47kOhm respectively. The choice of pull-down or pull-up resistor depends on the output configuration of the signal source. If you have an open-collector output, the pull-up resistor will be a better choice.
However, all this relates to a pure transfer of the state of the signal source (high or low), and the resistor values are specified as "typical" on purpose, there is no tolerance field indicated. If you have to make a measurement where the impedance of the signal line plays an important role, you should use some analog high-input circuitry and add a resistor of the required value between the signal line and GND.
This answer contains a lot of analog electronics stuff, but an understanding of basic analog circuitry is crucial if you are dealing with line impedances or terminating resistors.

Incorrectly calculating hfe/input impedance

Hello
Multisim calculates wrongly the input impedance of a common emitter stage - judging from the voltage drop on the base resistor network it appears it assumes a hfe of about 10, when the real value is over 500. I used the 2N2222A as a model, and the error is there on multiple transistors with hfes many multiples of 10.
Could you please let me know what I am witnessing here?
Thanks
Akis

Hi All,
I also ran this test and found that the HFE value was around the 220 mark. I wonder if you are looking at a different flavour of 2n2222A transistor? A quick look on google revealed the following components
Microsemi - HFE between 50 and 100
Philips Semi conductors - HFE 75
SemiLab - HFE between 100 and 300.
I think the thing to note is that these transistors can have a quite varying value for HFE. If you navigate to the component browser, find the 2N2222A component and click on the button marked "Detail report". You can see that the hFE value will vary between 35 and 300.
I hope this helps,
Many thanks,
Andrew McLennan
Applications Engineer
National Instruments

PXI 4070 use DAQmx Drivers

I have replaced a PXI 4060 card with a PXI 4070 card in a PXI 1042 chassis that I use for resistance measurements. I want to use DAQmx drivers instead of the traditional daq drivers. How can I do this?
My controlling software is VB6. I have had issues with traditional daq on Windows XP machines with new NI installations. Errors indicate there is an issue with the traditional daq drivers. The sample applications installed with the niDMM 2.7 installation error with message "Error Loading Driver Module". I have used the palbase utility in the past to work around this issue, however, the palbase utility is not failing to change the base address. There is an error message associated with the failure, but I figure I may save myself the headache by switching to DAQmx drivers.

I would recommend upgrading to the niDMM 3.0.4 drivers found here. This version is still compatible with Visual Basic 6.0 and Windows XP. niDMM 2.7 would have installed NI-DAQ 8.5. The name indicates that it is traditional DAQ, but as far as I can tell, version 8.5 was only DAQmx. 3.0.4 will also install a newer version of DAQmx that is compatible with XP, as well as the examples. It seems that the version you have should have worked, but there may be some corruption, or there may have been a version of traditional DAQ 8.5 at some time (we had some versions of NI-DAQ that included both traditional DAQ and DAQmx). I hope this helps!
Thanks,
Sean
Applications Engineering Specialist - Semiconductor Test
National Instruments

Error -1074117754 thrown when sequence tries to initialize PXI-4070

My customer is reporting that when TestStand attempts to initialize hardware at the start of the product test sequences, the system throws an error -1074117754. He believes that it's associated with the PXI-4070 DMM, as he also cannot talk to the card with the soft front panel. Has anyone seen this code before? Any ideas what it means? Any known fixes? Thanks!

Issues concerning this error have typically indicated faulty hardware in the past, so you may have to RMA it. However, before you try that, try the following troubleshooting steps:
- Reboot
- Re-install DMM drivers (make sure to use the newest version: 2.6)
- Try the card in a different PXI slot
- Try the card in a different PXI chassis
- Try a different DMM in the same PXI chassis and see if it works
Again, we've seen this issue before, so if it persists, contact support so you can send it in for repair.
Elijah Kerry
Senior Product Manager, LabVIEW
Follow my Software Engineering for LabVIEW Blog

-107418650 error with PXI-4070 even W/O autorange.

I have a PXI-1033 that includes a PXI-4070 in slot 5. I am using a version of the Switch Scanning with DMM - Handshaking.vi but I changed it to read a fixed scan list and replaced the meter while loop with a fixed read of 144 samples. After this VI runs approximately 47 times I get this error:
I have NI-DMM 3.0.4, NI-DAQmx 9.3.0f2 LabView 2101SP1 and am running Vista Business 32 bit. I am using 4 wire resistance and tried both auto and fixed range with the same results. Before this loop the only DMM related functions is to read 4 wire resistance readings and close the DMM. That seems to loop forever without any problems.
Rebooting dozens of times a day is getting old fast, any ideas?
Solved!
Go to Solution.

Here is the code that causes the error. I can run the Switch Scanning with DMM - Handshaking.VI all day without problems. It's the version I modified that I seem to be unable to fix. The test VI will run from for sometimes as few as 2 loops and hang the system.
Attachments:
Scan list and measure.vi ‏48 KB
Run switch to error.vi ‏15 KB

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

PXI-4070 DMM in PXIe-1075 Chassis not found

I have a PXIe-1075 chassis and four PXI-4070 DMMs. I orginally had the four DMMs in slots 2,3, 4 & 5 but descided to move the modules around including two of the DMMs so they are in slots 16 and 17. When I did this the DMMs are not found in Measurement and Automation Explorer. If I remove the module in slot 3 (PXIe-2531) they will reappear. The main reason for moving the modules was to maximize through put because slots 2 through 4 share a PCIe switch (as do slots 15 through 18).
Slots 2 through 5 and 15 through 18 should be hybrid compatiable. Are there rules for mixing hybrid and PXIe modules?

Chris,
I don't know about the original problem, but you can get the reconfiguration effect in device manager. Open device manager, select view->by connection, and then start expanding things until you find your device. On my Windows 7 PC the hierarchy starts with something like [computerName]->[ACPI x64-based PC]->[Microsoft ACPI-Compliant System]->[PCI bus]->[something Root Port]->[PCI standard PCI-to-PCI bridge]...
Go to the PCI-to-PCI bridge listed under the root port and above the devices in your chassis, right-click and select "uninstall". Open Measurement and Automation Explorer and delete the devices (they should be non-present). Then either reboot or go to device manager's munu item action->scan for hardware changes. That should cause Windows to re-find all your devices.
- Robert

Use of PXI 4070 for calibration with CalExec

I am running CalExec 3.1
NI 5421 and 5422 cards need the DMM NI PXI-4070 for the calibration. Can I use HP 34401A instead of that?
Thankyou,
Poornima

Hi Poornima,
Yes you can use the 34401a. Test Exec uses IVI so you can choose which IVI device you wish to use.
Hope this helps,
Nick

Change Input impedance from 1M to 50ohm of 5133

The input cable and all the other parts are 50ohm. Also I observed a reflection and oscilaition when inject a single pulse wave. If use 50ohm input impedance oscilliscope, it will not appear. I want to change the input impedance to 50ohm. Can I do so. Can I parallel a 50ohm resistor at input, thanks.

The spec points out only a 1M input impedance, so the only option I see is to use a 50Ohm termination ( usually a 50Ohm feedthrough is hard to find in the lab, but a T coupler and a 50Ohm 'terminator' )
And yes, you can use one resistor, however depending on the frequency range it is wise to use 4 200Ohm SMD and solder them in a cross from the shield to inner conductor. (And clean the flux )
(and 200R are better to get than 50R) Don't use standard wired resistors, due to their inductivity. Standard SMD is fine up to 1GHz.
Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
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LV12 How to configure PXI-4070 DMM current function?

Dear all
I have a problem about LV12 software to config PXI-4070 DMM current function.
my vi...NI DMM initial >>>NI DMM reset >>> NI DMM Configure Measurement (Current function) >>> NI DMM Reading >>>>
When I testing with my vi, the calibrator (source) error "Current Compliance Voltage Exceeded".
but when I testing with DMM front panel 3.0, the calibrator can generated current and PXI-4070 can reading.
Please help me to solve this problem.
Regard,
Sermsak.
Solved!
Go to Solution.

The error looks like it is related to a power supply or an SMU that is trying to source something out of its specified range.
Info about compliance:
http://zone.ni.com/reference/en-XX/help/370736L-01/ni_dc_power_supplies_help/compliance/
http://zone.ni.com/reference/en-XX/help/370736L-01/nidcpowerviref/nidcpower_query_in_compliance/
Things to consider:
1) Where in the code is the error occurring?
2) Can you run example NI-DMM code? (from Help>>find examples>>Hardware I/O>>Modular Instruments>>NI-DMM)

What is the PCI-1422 external trigger input impedance?

I wish to drive this line and would like to avoid mismatch problems.

The trigger lines on the 1422 go straight into TTL buffers which have very high input impedance (in the megaohm range).

DMM PXI 4070 synchronisation trigger généré par PXI6229 (Daq M)

Bonjour,
Je cherche a synchroniser 2 DMM PXI 4070 avec un trigger interne.
Les 4070 ne génerant pas de trigger, je me tourne vers une Daq PXI6229 pour le générer.
ci-joint, le code qui ne fonctionne pas, mais qui donne une idée de la fonction...
Quelqu'un pourrait-il me dire ou est l'erreur ?
Les entrées trigger des PXI 4070 sont notifié TTLx ; faut-il router le signal généré par la 6229 ? et sur quelles lignes ? (dev1/pxi_trig0) ?
Merci.
Ludis
Résolu !
Accéder à la solution.
Pièces jointes :
DMM_PXI4070_Sync.Trig_PXI6229.vi ‏30 KB

Bonjour,
La méthode proposée est correcte: il s'agit en effet de générer un signal créneau avec la sortie compteur0 de la carte DAQ et d'utiliser ce signal créneau en tant que trigger pour les 2 cartes DMM.
Le routage du signal peut se faire en externe (cabler physiquement le terminal Counter0 Output de la carte DAQ à l'entrée TRIG de la DMM et choisir cette entrée au niveau de la configuration du trigger de la DMM) ou en interne.
Pour router le signal en interne, il faut utiliser un noeud de propriété de voie pour la tâche compteur afin de reconfigurer le terminal de sortie (voir pièce jointe). On choisira par exemple "PXI Trigger line 0". Au niveau de la configuration du trigger sur la tâche DMM, il faudra choisir en tant que source de trigger la même ligne (TTL0 = PXI Trigger Line 0).
Cordialement,
Thomas B. | CLAD
National Instruments France
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Pièces jointes :
Reconfiguration du terminal de sortie du compteur à l'aide d'un noeud de prop.png ‏20 KB
Counter Pinout - terminaux par défaut.png ‏40 KB
trig source property.png ‏65 KB

Audigy 2 ZS Notebook Input Impedance and Capacita

Hello, anyone here know the input impedance and capacitance of this card? TIA

OK, thank you for the information. More than likely something has gone wrong with your Windows registry. Rather than delve into that, I would suggest that you go back into Device Manager, and 'Uninstall' you 'On Board' sound card, and reboot your machine. While the notebook is off, remove the PCMCIA card, and this will force the OS to reinstall the on board sound into Device Manager and hopefully the registry as well. Once this is done, you should see a return of your on board sound card's functions and be able to hear you on board speakers.
Please note, that it may take a secondary boot prior to hearing your on board sound card kick in. Simply 'Uninstall' the on board sound (and have the 'Drivers and Applications' CD/DVD from your notebook at hand... and the OS installation disc too), reboot then when the system logs back on it should reinstall the on board sound. It may ask you for the drivers CD/DVD and the OS CD/DVD during this process. That is why I suggested that you have it there when you start. Once this is complete, you should reboot and when your system comes back up you should have sound in your notebook's speakers.
If not, leave a message. There is one instance, I can think of, where you would successfully reinstall the on board sound (and it's system registry entries) and the sound NOT come from your speakers.
Enzo Matrix

Pxi 4070 input impedance

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