floating voltage solution 6008

Similar Questions

• Measurement of voltage USB 6008 ranging from 1mV

  Hi, I'm doing a supply at an angle for an amplifier using the USB-6008. The ranges I look are - 0.5 to 0.5 V and 0.5 to 2.5 V. To generate negative tensions, I use the + 2, 5V for a reading of differential voltage output as a 'ground '. Voltage measures have a delay that varies with the voltage, given this by drawing these variations and set the output to data acquisition there is still a 'noise' of +/-1 mv so that it is clear from this parcel of tension against the sample number:

  

  It seems that at some point the values are being rounded up to the nearest millivolt. I need to get to a resolution of 0.5 mV for my device, it will be possible with the USB-6008?

  The AO USB-600 x has a range from 0 to + 5 V and the 12-bit resolution. 5/4096 = 1.22 mV. Absolute precision is 7 mV typical and 36.4 mV maximum full scale.  The noise of the AO is not specified.

  If you measure the results with THE USB-6008, you have at least 0.5 mV, similar resolution system noise and absolute accuracy of 2.5 mV or more.

  It's probably as good as you will get with the box USB-6008.

  Lynn

• floating voltage DAQPad-6015

  Hey.

  I did some basic tests on my DAQPad-6015 and whatever the pins I connected to, it always floats up to its max voltage, 10V.  I'm testing it able and automation, differential, on demand.  Any suggestions as to what is happening?

  Katie

  Hey,.

  I thought about it.  The problem was the ground.  I had put labview aside for a few weeks, and then completely forgot that the differential works between two adjacent pins.  I changed once out it was working perfectly.  Thanks for your help.

  Katie

• remove the casing usb-6009 floating voltage

  Hello

  I created a VI that records 6 6 different battery voltages, and everything is fine, until I disconnected a battery and it stills sees about 1.4 volts. How can I remove this offset (?)

  It is present on the readings connected?

  Concerning

  Steven

  The USB-6009 case has a non-standard input circuit which ends in ~1.4 V through the ~ 144000 ohms. Consult the manual for a schematic representation.

  As long as your source has a much lower than the 144000 ohms impedance and can sink current (if the source voltage)< 1.4v),="" then="" you="" should="" be="" ok.=""  batteries,="" even="" nearly="" discharged,="" should="" not="" be="" a="">

  Lynn

• Is it possible to a floating voltage with the output box usb-6009?

  Hello

  I was wondering if anyone knows how to a difference in voltage output 0 to 1 AO on the box USB-6009 DAQmx AO without reference to the ground.  Any help would be greatly appreciated.

  Thank you

  Bryan

  Hello

  Page 19 of the manual USB-6009:

  http://www.NI.com/PDF/manuals/371303l.PDF

  Shows the internal circuits of the DAC are referenced to ground so there is no way to internally isolate it / provide any reference.

  Maybe there is another way to make the desired effect? I don't know the details of your request to suggest everything.

  Please do not hesitate to ask questions

• Calibration with the voltage source - float connections

  Hello

  I want to calibrate a PXI-6133 DAQ with a floating voltage source. It says in the manual of the calibration connect the positive output of the Stallion to the AI + pine. Since my source of tension is floating I connect the negative output to GND. HAVE I - HAVE GND short or leave - not connected?

  Thank you

  Jens

  Sorry, I just answered this question for my part it is logical to short-circuit the entries HAVE - and GND.

• DAQ 6008 must be reconnected

  Hello

  I have a problem during execution of a measure of voltage using 6008 DAQ board.

  I need to reconnect to the Commission whenever I want to measure otherwise if I launch the program, stop and then run it again

  I get error 200284 saying that some or all of the requested samples are not yet acquired.

  Any suggestion is welcome.

  Thanks, Chipet

  Hey Chipet,.

  I looked into this error code for a little bit and found this article that passes on a few common reasons to get:

  http://digital.NI.com/public.nsf/allkb/FEF778AD990D5BD886256DD700770103

  I don't know where this happens in your VI, but I guess it happens when shows you samples. Setting the type of reading you do (finished vs continuous and corresponding settings) could be useful. Here is another article that goes through some of the most common functions DAQmx and when to use:

  http://www.NI.com/white-paper/2835/en

  Hope this helps,

  -KP

• Single end input analog

  
  

  Hello

  The USB-6008 can only read differential or CSR, which would explain why the other configurations would not work. I am pleased to learn that the CSR configuration works correctly now. 1.4 floating voltage V is expected when there is no source that is connected to the device due to the circuitry of the 6008. This is a Ko regarding this problem more in detail:

  http://digital.NI.com/public.nsf/allkb/C7E181E51E4299FC862570A700604141?OpenDocument

  -Erik S

• Isolation between channels SMU 5451

  Hello

  We try to use the exit CH0 + as a floating voltage source. Our instrument is the NOR-SMU-5451.

  It seems that the SMA cable screen is difficult driven ashore by the analog output.

  I can't find in the documentation it is possible to isolate the CHx outputs of Earth.

  Does anyone know if this is possible or not?

  Thanks in advance!

  Hello

  I looked in your query about isolation and it is not something that is possible with the nature of the card being the only complete reference.

  Thanks for posting!

  Kind regards

  Will be

  National Instruments

  Engineering applications

• Tension on the NI5761-2 entries?

  There is a voltage on the inputs of the NI5761-2 (DC-coupled) with connected signals.

  When I connect a voltmeter and a termination 50 ohm at the entrance of the NI5761-2, I measure a voltage of 0.460V out of it.

  -Why, I expected something about the absence of any tension.

  Hey Kees,

  Some FlexRIO Adapter Modules do not have front-end packaging that other instruments have that removed the tension as seen looking for the analog input to zero. The 5761 doesn't have this conditioning, so I expect to see a non zero value if connect you a voltmeter to the analog input as you have done. I guess the question is why do you care what is the floating voltage coming out of the analog input? As long as the ADC values we get from the 5761 correctly reflect the values that the ESA provides it, then its all good.

• Measures of true bipolar voltage with USB 6008/6009

  The 6008 or 6009 to make true bipolar (positive and negative voltages referenced to GND) measurements?  If not, what is the solution to purchase cheaper data this feature?

  Thank you.

  The question of unipolar vs bipolar vs bipolar Pseudo-aleatoire also was mentioned in this thread.  The 6008 6009 use bipolar-only mode and load the setting differential input or CSR.  Please note that {unipolar / bipolar / Pseudo-bipolaire} is independent of {differential / CSR / Pseudo-differentiel}.

  The 6008/6009 don't use 'Pseudo-bipolaire', which means that each differential input should be positive with respect to the ground.

  Best regards

• USB 6008 weird analog voltage reading

  Hello

  I use the USB-6008 to measure a voltage of a Lithium battery, 3.66V.

  the battery come with a blocking diode (in series with the battery) of 1N5820, who have a fall of voltage drop of 0, 1V.

  battery with diodes in series (this is the way in which the battery is shipped with)

  -measure with DDM yield 3.66V without you connect to usb6008

  -measure with DDM yield connected to usb6008 (putting OUT VOLTAGE USB6008) 3.59V

  -able with USB-6008 performance 3.59V connected to usb6008

  battery with diode removed

  -measure with DDM yield 3.66V without you connect to usb6008

  -measure with DDM yield connected to usb6008 (putting OUT VOLTAGE USB6008) 3.66V

  -able with USB-6008 performance 3.66V connected to usb6008

  Thus, it seems that the problem is in the led in the series.  This is why the battery voltage has fallen to 0.07V? the series diode will hurt the USB-6008?

  Maybe people who know the circuits inside the USB-6008 can give me an answer.

  Thanks in advance.

  Hi learnerd,.

  The fall that you see is falling forward in the diode.  As an entry class device, the USB-6008 case has a relatively low input impedance (144kOhm) and thus draws a little current of the device.  Looking at the datasheet of the 1N5820 (http://www.onsemi.com/pub_link/Collateral/1N5820-D.PDF), Figure 7 shows that at 25 ° C, a draw of 50mA will cause a fall front of 200mV.  While the figure does not extend the curve below 50mA, extrapolating the given curve would indicate that a drop of 70mV would cause only a few current microamperes.

  A DMM will have a much greater input impedance (GOhms instead of kohm) and won't draw enough current to influence the measure, that's why you wouldn't see the decline with only the DMM.

  The diode will not harm the USB-6008 somehow.

  Good luck with your application,

  The f

• DAQ USB-6008 will be able to power and record voltage for UMS T5 blood pressure at the same time?

  I would use my NI USB-6008 to power my blood pressure monitor UMS T5 (http://www.ums-muc.de/en/products/tensiometer/t5.html) but also to take readings of it, but I don't know if it's possible to do it properly. The power supply for the instrument can be as low as 5V, I can easily get the dedicated + 5V channel. I'm able to feed the instrument and connect it to an analog input on the 6008 and measure a voltage in differential mode. However, when you read the documentation of support for the instrument, I find the following:

  "Potential pitfalls of data acquisition: the pressure transducer is configured in a full Wheatstone bridge, the input voltage and mV signal output can be connected to the same reference (mass)." Therefore, the mV output signal can be measured using a differential voltage measurement. Therefore, do not make an asymmetric measure of pressure transducer mV output. "(http://www.decagon.com/assets/Uploads/MeasuringUMSTensiometerswithnon-UMSControlandDataAcquisitionSystems.pdf)

  My understanding is that the 6008 can take a differential measure if I attach the signal '+' and the signal "-" to the analog inputs of positive and negative terminals. However, it seems that all the ports of ground on the 6008 are grounded to the same reference, which would make my measure of invalid tension according to the above paragraph. So my real question is: if I try to record the voltage with one of the analog inputs on the 6008 in this way, is the valid measurement? Or I need to find a separate power supply, with a different reference field to ensure that the measure is accurate?

  The technical details of this device is very poor. The manual is not much better. Companies that want to sell scientific equipment should publish decent cards or get out of business.

  In section 3.4.3 General requirements the device is described as a "bridge not amplified circuit.  This information along with the impedance of the bridge should be in the specifications, because it is essential to apply the device under any circumstances other than the nominal behavior in 10.6 V.

  The answer to your question is:

  You can use it with the box USB-6008.  The 5 V supply will result in output voltages a little less than half (5/10.6) the voltage specified in nominal conditions. You can use the differential input mode on the box USB-6008.  The absolute input voltages will be approximately 2.5 V with the 5 V power supply. This voltage is in the range of the aircraft. The differences are likely to be less than 100 mV. The resolution of the USB-6008 on the + /-1 V is located about 0.5 mV so your resolution of pressure will be about 1% of full scale. The voltage input impedance and termination of the USB-6008 will present a few errors.  These can be in the order of 5 to 10%. I can't predict much better without the missing bridge impedance specification.  These errors should be relatively constant and systematic. A calibration of the whole system - sensor and together hardware DAQ should allow you to compensate for a large part of this error.

  Lynn

• Beyond the limits of voltage on USB 6008?

  I use a USB-6008 to measure analog differential in the range of 3 to 5.3 V. I chose this range, because outside this range, I'm not interested in what the tension is, knowing that his "on the rail", but to aid resolution of the ADC in this range.

  So for a signal of ~0.05 supply V, I expected to read 3V, telling me that the voltage is lower than 3V, but again it returns 0.05v?

  As it was unexpected for me, could someone please explain what can / should I expect of my USB6008 of the responsed to the signals that are the limits? Is there an effect of "rollover"? Should you return the value to the limit? Depends on how far the limit is?

  Thanks for your help!

  Entry level do not think that way. You specify the range is that you wait for the signal and the DAQmx driver will set the most appropriate range that the device supports. The actual ranges are indicated in the guide. In your case, because you specify a max of 5.3, the device would be defined the +/-10 volts range.

• NEITHER USB 6008 voltage offset using CSR and measurement of diff.

  Hi all

  I am currently trying the NI USB 6008 housing and I'm getting problems when reading voltage analog using CSR or differential.

  So basically, what I want to measure is a PWM signal (0 to 12V), which is divided by a divisor of tension (by two). But instead of measured 0V and 6V

  I am in a position a constant 0.8V and approximately 3V.

  On the side of digital data acquisition, I give you on impulses for the SSR... and it works fine.

  I connect it that way: http://digital.ni.com/public.nsf/allkb/95CC0CB11D7DF3D18625712E000C4ABD?OpenDocument

  Would apreciate any help

  Best regards

  EDIT: Attached graphics acquired are

  What is the impedance of your voltage divider?  The input of the USB-6008 impedance is not very high. If the impedance of the partition is large, it could cause the effect you see.

  Lynn