Using the DAQ-9178 and 9205 Voltage Module, how do I build a 16 Channel Voltmeter with a range of 0--50Vdc?

I have already built an 8 channel 10:1 voltage divider using 1% resistors. My problem is there is a lot of AC noise on the DC signal and the voltages don't match my Fluke DVM which is sitting beside.
Solved!
Go to Solution.
Attachments:
8 Channel Voltage Screen.JPG ‏172 KB

A little more info... Only Channels one and two have signal going to them. Ch1, (a0), is connected to a 9volt battery, and ch2, (a1), is connected to a variable bench supply set for 17Vdc.
The DVM is rock steady, however the LabVIEW indicators show what I assume is a product of the AC noise.
Any help would be appreciated
Thanks so much
-Matt
Attachments:
8 Channel Voltage Block Diag.JPG ‏269 KB

Similar Messages

Program NI boards using the DAQ Libary and Borland C++ builder 5

Hi,
I am programming Lab PC-1200 NI boards using the DAQ Libary and Borland C++ builder 5.
But I get the following error msg:"[Linker Error] 'C:\NI-DAQ\LIB\NIDEX32.LIB' contains invalid OMF record, type 0x21 (possibly COFF)" although I have linked all DAQ lib files in C builder.
Anyone who had tried or succeeded in a similar application and solved this problem??
Thank you in advance for your help!

Hi w,
Please check out this related DevZone question/answer:
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RNAME=ViewQuestion&HOID=5065000000080000007D180000&ECategory=Measurement+Hardware.Real-Time+Data+Acquisition
The basic reason is that we design our libraries for many environments, but Builder is not one of them. You can use the dll's (they're just dll's), but you will need to make your own library or use run-time linking.
For more information about run-time linking, you can try http://msdn.microsoft.com and search for "About Dynamic-Link Libraries"
I hope this gives you a start.
John N
Applications Engineer
National Instruments

I just downloaded the latest software to my iPhone 4 and I am now getting my sons messages. he too uses the same itunes and pc to sync, how do I stop this?

Hi, I downloaded the latest software for my iphone 4 and this morning I received text messages that were meant for my son. we both use the same PC and iTunes for our iphones, so will he get a copy of my messages too when he upgrades his software?
does anyone know how to stop this? or how it happened in the first place?
thanks
Cathy

You have an Apple ID signed in to all the devices which is causing this.
"When you sign in to your Apple ID with iMessage using an iPhone with iOS 6, your Apple ID is linked to your phone number. This allows you to receive iMessages sent to your phone number on other iOS 6 devices signed in to the same Apple ID."
To correct this, go into Settings > Messages > Send and Recieve at > See below...
On your phone: Uncheck your son's phone number
On his phone: Uncheck your phone number.
On iPad: Uncheck both phone numbers to prevent iMessages sent to either number to also appear on the iPad.
If you have email addresses associated here, then you may have to remove those as well, although you won't be able to remove the Apple ID that you're using. Any iMessage sent to that Apple ID will arrive at all the device unless you sign out of that Apple ID and create/use another Apple ID for that device.

How to save data acquired from NI-DAQ in text format instead of TDMS using the DAQ-mx ANSI C code?

Hi,
I wanted to save data acquired from NI-DAQ (for example, NI 9234) in a file using the DAQ-mx ANSI C Code. The response I got was as follows:-
One way to do it is with TDMS logging. DAQmx comes with functions designed to log to a TDMS file. This is a special file type that is used for collecting data in a logical format. It can be displayed in a TDMS viewer where data is separated into groups and channels. NI-DAQmx provides examples for how to log to TDMS. Look at the TDMS examples in the C:\Users\Public\Documents\National Instruments\NI-DAQ\Examples\DAQmx ANSI C\Analog In\Measure Voltage directory.
However, now I want to know is there a way that using that same C code, can we save the data in a .txt file format (Text File) instead of a TDMS file? We actually want to access that file through MATLAB (that's why we want to save it in text format).
Also on an other note, is there a way we can access & open TDMS files by MATLAB?
Thanks,
Sauvik Das Gupta

There's a way you can access TDMS files in MATLAB:
http://zone.ni.com/devzone/cda/tut/p/id/7446

How to get the job logs from sm35 by using the queue id and session name?

hi all,
can any one please let me know how to read the job log from sm35 by using the session name and queue id. i have the job name and job count but is it possible to download the job log by using the queue id and session name.
FYI..
i want to read this job log and i want to send it to an email id.
-> i am using the job_open and submitting the zreport via job name and job count and then i am using the function module job_close.
but this is not working in my scenario i have the queue id and session name by using this two i want to get the job log is there any function module available or code please provide me some inputs.
thanks in advance,
koushik

Hi Bharath,
If you want to download it to the local file then you can follow the instructions in the below link.
How to download Batch Input Session Log?
Regards,
Sachin

How to control a digital output signal using the DAQ assistant?

I am using a USB 6251 DAQ board and would like to control a switch. I am gathering airflow, pressure, and acoustic data on the same board (analog input) and would like the switch to trigger when the airflow value is within a pre-determined range. Finally, I would like to reverse the polarity of the switch (to off) about a second after the initial digital signal, all of which is during continuous data acquisition.
I am able to actuate the switch only when pressing the "run" button in the DAQ assistant window. I am proficient with data acquisition but have never tried programming an output... Please help!
Thanks!
-a troubled researcher
P.S. I am running LabVIEW 8.5 as well.

blsmith4,
You probably won't get the control of the digital port on your card by only using the DAQ Assistant. One of the following examples should provide you the functionality that you would like out of the box:
Digital - SW - Timed Output (Simple)
Digital - Continuous Output (More Complex)
Continuous Write Digital Port - External Clock - Non Regeneration (Most Complex)
Let me know if these work better for you.
Best,
Jason M.
Applications Engineer
National Instruments

Varying ON time pulse train generation using NI cRIO-9073 and NI 9401 module

Hi,
I am a beginner to the Labview environment. Am using NI cRIO-9073 and NI 9401 module; and NI Labview 2013. I want to generate 64 pulses, wherein the ON time of the pulses are varying as shown below. The Pulses need to have a constant period of about 34µs. The pulses should have a constant amplitude anywhere from 5 to 10V. I am trying to do the same in FPGA interface mode but failing to do so. Please advise me..... Please also suggest pdf and video resources to learn Labview programming.
Pulse ON Time
18 µs
19 µs
20 µs
21 µs
22 µs
23 µs
24 µs
25 µs
26 µs
27 µs
28 µs
29 µs
30 µs
31 µs
32 µs
33 µs
33 µs
32 µs
31 µs
30 µs
29 µs
28 µs
27 µs
26 µs
25 µs
24 µs
23 µs
22 µs
21 µs
20 µs
19 µs
18 µs
17 µs
16 µs
15 µs
14 µs
13 µs
12 µs
11 µs
10 µs
09 µs
08 µs
07 µs
06 µs
05 µs
04 µs
03 µs
02 µs
02 µs
03 µs
04 µs
05 µs
06 µs
07 µs
08 µs
09 µs
10 µs
11 µs
12 µs
13 µs
14 µs
15 µs
16 µs
17 µs

t81,
It is possible to make frequency measurements with either the 9422 or the 9425 but each will have its own limitations in the range of frequency it will be able to accurately measure.
A few things to know:
1. What are the frequency ranges for each sensor (tach and MFM)? More than just knowing Hz/kHz will be helpful.
2. To what accuracy do you need to measure these signals?
The 9422 supports a specialty digital configuration counter input that can be configured for frequency measurement (see link)
http://zone.ni.com/reference/en-XX/help/372603F-01/riohelprt/crio-9422_rt/
The specialty mode is only available when using Scan Interface mode, not with FPGA.
But the max clock rate in the specifications for the 9422 is 4kHz so this may not be sufficient for the tachometer. I believe this is the max rate at which the module will update its state no matter how fast the underlying software (RT controller) is running.
The 9425 has a higher clock rate (~140kHz) but doesn't support the specialty digital mode mentioned above. It is also a software timed only device but this shouldn't be a problem if you use FPGA.
Dan

Generat two signals at the same time and reading voltage

Hii
i have try to generate two signals at the same time and read voltage from another port on the board(not have to be at the same time), i have not alot of expriens in labview
and i based my code of example(http://zone.ni.com/devzone/cda/epd/p/id/5197) from yours site and try to suit to my needs
now my problem is when i generat the 2 signals(that work perfect) i canot read voltage from another port on my CB-68LP
i can not find the problem and make it over i hope there is away to figer out and fix it.
i have two cards 6229, and two CB-68LP board.
labview 8.5.
my code is look like this - http://img142.imageshack.us/my.php?image=scrennshot2no2.png
(this works perfect).
and this is my code after suit to my need - http://img183.imageshack.us/my.php?image=scrennshotfl5.png,there is error exception at the right side.
the exception-
Possible reason(s):
Specified route cannot be satisfied, because it requires resources that are currently in use by another route.
Property: RefClk.Src
Source Device: Dev1
Source Terminal: 10MHzRefClock
Required Resources in Use by
Task Name: _unnamedTask<0>
Source Device: Dev1
Source Terminal: None
Destination Device: Dev1
Destination Terminal: RefClock
Task Name: _unnamedTask<1>
eyal

sorry...
The AO tasks is very important they will be synchronize ,it is very importent the two tasks will start at the same time
and after it run at synchronize mode i will need to make reading of voltage
i gust try to make simulation of machin (i give that machin AO and reading from it voltage that all)
first of all i make the two signals(synchronize signals).
and after it i will need to reading voltage.
i can make two signals synchronize together.
i can make reading voltage
but i can't make two signals synchronize together with reading voltage
it throw to me this error message.
i am looking for away to figer this out.
thank's for any help
eyal
Attachments:
test11.vi ‏130 KB

I am using the mac QQ and when I login it said login timeout.

I am using the mac QQ and when I login it said login timeout.

If you are missing using google maps - try the Nokia map app called "here"

My LR 4 suddenly no longer recognized my memory cards. I am using the same cards and cameras but consisitently get the error message:"files not imported because the files could not be read. they are jpg and nef files...I am stuck without my workhorse! Any

My LR 4 suddenly no longer recognized my memory cards. I am using the same cards and cameras but consisitently get the error message:"files not imported because the files could not be read. they are jpg and nef files...I am stuck without my workhorse! Any advice is helpful. This has never happened in 6 years

answered in your other thread LR 4 suddenly no longer recognizes files.

I am using the MODBUS library and can't receive data, however I can send it just fine?

Hi,
I am using the Modbus Library to communicate with a VFD to control a fan. I am using the master write and read vi. I can write data to the VFD and get the fan to do what I want. The VFD is supposed to send a confirmation packet after I tell it to do something and I can also read its registers. When I debug the VI it shows the problem is the buffer always reads zero and the VI timesout. If I watch the lights of the USB to RS 485 adapter I am using to interface with the VFD, I see that the RX light flashs right after I send a message. So I should have something in the buffer. Does anyone have any suggestions?
Aaron
Solved!
Go to Solution.

Ok, heres what happened for anyone who has this problem. In the MB Serial Receive.vi The Bytes at Port property node was reading 0 even though there was something in the buffer. The program execution was then stuck in a loop till it timed out and never went on to read anything from the serial port buffer. I didn't spend too much time wondering why that VI didn't work and created my own. With an appropriate delay after writing to the serial port, I used the same Bytes at Port property node and was able to get the right number of bytes to then feed the read VISA vi the number of bytes to read. I got the right response message and everything seemed good. But of course NOT! I then experimented with writing different speeds to the VFD to get the fan to run at different speeds. I found a small range of speeds where I would get no response from the VFD, either by it functioning or sending me a response packet. After quite some time, I found there is an error in the LRC-8 code in the MODBUS NI library. It does not mandate the LRC be a two character value. So if your LRC turns out to be a single character value such as F (which should be 0F) you get an incomplete MODBUS message. This was easily fixed in the LRC8 vi by telling the 'number to hexidecimal string' vi to produce an output with a minimum width of two. Then everything worked great. Moral of the story is the MODBUS library is clunky.

I am updating iphoto 9.1 to 9.3 and every time when I clicked for update aps store asked to open it in the account where you purchased. I am using the same account and its available in the purchased item of this account. Can someone resolve this problem.

I am updating iphoto 9.1 to 9.3 and every time when I clicked for update aps store asked to open it in the account where you purchased. I am using the same account and its available in the purchased item of this account. But in my purchased item library it indicates that you update iPhoto. I am not sure which account the aps store asking. Can someone resolve this problem.

Contact App Store support. They're the folks who can help with Account issues.
Regards
TD

I had to take my hp back to factory setting and reinstall itunes, when I tried to use Itunes match it said i had to Deauthorize all my computers. I am using the same computer and desperately need access to my music.

I had to take my hp back to factory setting and reinstall itunes, when I tried to use Itunes match it said i had to Deauthorize all my computers. I am using the same computer and desperately need access to my music.

When you reset to factory settings, the computer is de-authorised.
In iTunes menu Store > View Account > sign in > App Store > Deauthorise All.
Once done, authorise this computer iTunes.
Note: you can only do that once a year.

Hi. I am using the iPhone 4S and when I'm searching for places using Google it does not automatically detect my location. How do I change this? FYI...under settings i

Hi. I am using the iPhone 4S and when I'm searching for places using Google it does not automatically detect my location. How do I change this? FYI...under settings i

If you are missing using google maps - try the Nokia map app called "here"

Hi. I am using the iPhone 4S and when I'm searching for places using Google it does not automatically detect my location. How do I change this? FYI...under settings i have it set at "Use new precise locations from my device."

Hi. I am using the iPhone 4S and when I'm searching for places using Google it does not automatically detect my location. How do I change this? FYI...under settings i have it set at "Use new precise locations from my device."

If you are missing using google maps - try the Nokia map app called "here"

Using the DAQ-9178 and 9205 Voltage Module, how do I build a 16 Channel Voltmeter with a range of 0--50Vdc?

Similar Messages

Maybe you are looking for