Differential vs. Single-ended connection

Hi,
I want to acquire a signal from a photodiode, which its output is as current, in the following: you can find the link of that.
I'd like to know which type of connection should I select?Differential or single-ended?
Thanks
Petar

Hi Petar2015,
I am unable to see the link that you intended to use, so I don’t know very well which photodiode you are using. In the following link, you should be able to find a little more information about the different ways to wire inputs.
http://www.ni.com/white-paper/3344/en/
I would recommend you to use the single ended to acquire input of current. But if I were you, I would read through the document and analyze the ways to connect it with the diode you have.
Regards,
Luis C.
Applications Engineer

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How to connect single ended connections?

I am new in this field. I am trying to accquire single ended data on
single channel using the following configuration(see fig A and fig B in the
attached figure) . It works all right when i take input from signal
generator. please notice specially the power/signal connections. I have
chosen NRSE settings.
For my application I have to to test the same settings when the input
signal is taken from 4* 1.5 V pencil cells ( see figure B). In this setting
however it does not work at all. I have again chosen NRSE settings. What is
the problem? What is NRSE and RSE? What is the difference?What should I
choose in this case?
Can anybody help?
[Attachment diagram.doc, see below]
[See first answer for additio
nal information]

[Attachment(s) for question]
Attachments:
diagram.doc ‏73 KB

Problem with Non Reference Single ended and Differential measurements

The following was misposted at the Real-Time DAQ category and should appear in this Multifunction DAQ category:
I am doing a differential measurement and then a non referenced single ended AI measurement using the same PCI 6025E card. Most of the time I get good measurements however a small percentage of the time I get very strange measurements.

Make sure that you have set up each of your channels for the appropriate mode of measurement. By default, Measurement & Automation Explorer (MAX) has a property set for your card, either differential, nonreferenced singled ended, or referenced single ended. If all your channels are in one mode, then you can just left those defaults stay. Otherwise, as in your case, you would need to programmatically set each channel for the right mode.
For instance, in LabVIEW, the AI Configure.vi has an input parameter for "coupling and input config". This is an array of data that includes the measurement mode. Each element of the array corresponds to the element in the channels array, so you can configure each channel appropriately. Make sure that you have this set up in yo
ur program, and you should get the correct measurements.
Finally, double-check your physical connections to see that they match the measurement mode you chose. You can find this in the 6023E/6024E/6025E User Manual or the PCI E Series User Manual at the http://www.ni.com/manuals website.
Regards,
Geneva L.
Applications Engineer
National Instruments
http://www.ni.com/ask

How to specify "single ended" or "differential" data acquiring in NIDAQmx c++

Dear all,
i wrote a program in VC++ which acquires some analog voltage channels using NIDAQmx. By means of the "DAQmxCreateAIVoltageChan()" function it works properly, but I've faced a question:
When I measure a sine wave as a input channel whith diffrential terminals (pins) on NI-Device, there is no problem but if I connect the input signal in single ended form (connect input signal to each single terminal and connect GND of NI-Device and Signal generator together), there is a irrigular and alternative offset (DC value) in aqcuiered data that shows there is an error in connection of GND's. (I'm sure about function generators)
Is there any specific function to assign exactly that input data should be measured in differential or single ended form? I mean, should I write seperate codes in C++, if I want to measure input signal in both forms of differential and single ended or does the mentioned function satisfy both needs (when the answer is positive wherefrom does this fault emerge)?
Thanks a lot for your helpfully replies in advance,
sincerely yours,
Mohammad Harati

Hi Harati,
I'm not sure what your question is, but I have some questions too:
1) Which device are you using?
2) Did you connect the AI GND pin (in single ended)?
3) As you called DAQmxCreateAIVoltageChan(), what parameter did you set for terminalConfig in eiter cases?
Here is the documentation for DAQmxCreateAIVoltageChan()
http://zone.ni.com/reference/en-XX/help/370471W-01/daqmxcfunc/daqmxcreateaivoltagechan/
This whitepaper may also help you:
http://www.ni.com/white-paper/7113/en/
Kind regards
Heinz

How do I set the PXI 6031E for single ended or differential input?

6030/1/2/3 E manual states that the 6031 and 33E has software selectable single ended or differential input per channel. How do I set it in labview? I have been unable to locate the property.

Are you using traditional daq or DAQmx??
look at this VI to understand how to select this feature for both Versions of DAQ
any doubts, do get back
Regards
Dev
Message Edited by devchander on 03-08-2006 10:30 PM
Attachments:
mode.vi ‏23 KB

Change inputs from single ended to differential at run time

I have a software package written that reads in analog values using a 6014 DAQ board. I want to allow it so that the user can select (at run time) whether the inputs are single ended or differential. This would be stored in a database and saved.
I am reading in the analog values using a CWAIPoint. I don't see anywhere where you can specify the Input Mode for a CWAIPoint at run time?!
Am I missing something?
Any help would be appreciated!
Thanks
CM

Sorry, just found the answer. First time I've answered my own question.
CWAIPoint1.Channels(X).InputMode =
Where X is the channel string. Intellisense will give you a list of input modes if this is typed in.

Differential Signal to Single Ended Signal Conversion

Hi,
Im facing a problem here. I need an ADC that reads 0-20mA. The signal comes from a signal conditioner that creates a differential signal. However, a NI device with single ended inputs is much cheaper than differential inputs.
The signal conditioner already exists and I cant change that.
Im looking for something that can convert the differential signal to a single-ended signal.
I tried finding an IC that does that, but couldnt find one. Do they exist?
Maybe its easier for voltage than for current.
How is this usually done?
Best regards,
Arvel

Use a current sensing resistor and then use a current shunt amplifier. The amplifier will amplify the voltage drop across the reistor. From there, you can just read the output voltage with a DAQ. Create a DAQmx scale to do the math to convert that voltage into a current reading.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

Can i use a single ended encoder with a 7344 controller?

Can i use a single ended encoder with a 7344 controller?

The encoder inputs of the 7344 are ground referenced. So the answer is yes, you can use a single ended encoder with a 7344 controller. Signal connection should be straight forward.
If you are using a UMI-7764 for signal connections please refer to the "Encoder Terminal Block" section (page 15) of the UMI User Guide. There are drawings for the signal connections for single ended and differential encoders.
For the case that you don't have the user guide of the UMI-7764 please download it from this link:
http://digital.ni.com/manuals.nsf/websearch/AC6FAA69218C9624862567BD0061DDAC?OpenDocument&node=132100_US
Best regards,
Jochen Klier
Applications Engineering Group Leader
National Instruments Germany GmbH

Can't get graphs to show single-ended input

Using mx Base, I've created an Analog continuous input task. I've configured the task on the configuration utility as single ended, but on my VI graph, the data shows up as what it would be if it were differential. Is there some kind of disconnect between the configuration utility and my task on my VI? when i use the NI datalogger that's included with the mx Base driver and I choose RSE as the terminal configuration, i get the correct readings (same readings as i see in the oscilloscope).
Please help!

Hello Greenepece. Thank you for contacting National Instruments. Your best bet is to use the dynamic examples that come with DAQmx Base. These examples can be found at C:\Program Files\National Instruments\LabVIEW 7.1\examples\daqmxbase\Dynamic\ai. In these examples there is a VI called DAQmx Base Create Channel.vi that has an input called input terminal configuration. Create a constant for this and select RSE. This should give you the same results as the Data Logger. Please let me know if you have any questions. Have a great day!
Marni S.
National Instruments

Which of single ended referenced & non-referenced is better in cutting crosstalk

I am using a SCB100 box to go into PCI-6031E(DAQ CARD) to go into a windows 2000 pro PC. I am running 2 speakers one at 98HZ and other at 112HZ and trying to measure distortion of my acoustic sensors. I know that differential mode in SCB100 box causes no cross talk between the channels. But I want to run a B&K 4190 microphone in single-ended mode only. B&K has just way too high noise floor and lot of harmonics when I run it in diff mode. SO, I would like to know from you guys
if single ended referenced mode is better or the single ended non-referenced mode in terms of cutting cross talk between channels.

shantaram,
The bias resistor allows the input to the DAQ card to function properly. Without it the card may accumulate charges that distort the incomming information. The bias resistor provides a way for these charges to dissipate. The 100kohm resistor provides a path for these charges without influencing the signal of interest.
Try this link for some refences:
http://search.ni.com/query.html?tx0=Differential+bias+resistor&op0=%2B&fl0=&ty0=w&tx1=&op1=&fl1=&ty1=w&tx2=&op2=%2B&fl2=&ty2=p&tx3=&op3=-&fl3=&ty3=w&advquery=on&lk=1&nh=10&ht=0&qp=+contenttype%3ATutorial+subsection2%3AdzTechPres+subsection2%3AdzTutorial&qt=&qs=&col=alldocs&qc=&pw=575&la=en&qm=0&st=1&oq=&rq=0&layout=TechResources&ql=a&si=0
Or Search the Technica
l Resources for: Differential+bias+resistor
(limit the search to tutorials and application notes
at:
http://search.ni.com/?col=alldocs&layout=TechResources&ql=a
This is a good article:
Field Wiring and Noise Considerations for Analog Signals found in the tech resources.
Mike

Differential using single ended mode

Hi I am using the multifunction DAS Card which is set to single end mode as I need to use it to acquire all input signals, using single end channels. Now I have got the corrected measured inputs in RMS voltage and I would like to get the differential value from the acquired inputs, using Labview functions. So How do I go about it?
Cheers,
Clement

If all you need is the difference between one channel and another, the subtract function usually works. If it's more complicated, could explain with more details?

Can I input the single-ended image signal to PCI-1424?

One of my customer wants to input the single-ended image signal to our PCI-1424 instead of the differential or TTL ones, is it impossible to do that ?I've check the user's manual and it only mentioned that the input signal can be DIFF or TTL-compatible.

TTL signals are single-ended, so if the image signal follows TTL specifications, it will work with the 1424.
Regards-
Julie S
Applications Engineer
National Instruments

Can i use single database connection in a hole java application?

can i use single database connection in a hole java application?.I have so many forms to use database connection.

Theoretically you can. Not only theoretically. I've seen lots of application which only uses one database connection (they were using, oracle or mysql)
The first reply given here assumed that the answer to
your question depends only on the design of your
application. That is not true.Yes it's true. Nothing in the original questions says that you aren't allowed to open or close the single connection that you have. It's looks more like the OP is interested in sharing a connection (i.e having a singleton or a connection pool with only one connection)
It does also depend on the behaviour of the database
in the background.
Most databases have a time out for connections that
are idle Not a problem. Most implementations of connection pools and applications which keeps a connection open have a timer which calls e.g. select * from dual (if you are using oracle) when the connection has been idle for X minutes.
(some, like db2 on z/OS, even cancel
connections, that are not idle, if they are open a
certain amount of time or have reached a given limit
of cpu seconds.)You would also have that problem if you had a connection pool with several connections.
In essence: If you have no control over the time
your application runs (and therefore your connection
is open) or over type or the configuration of the
database you are accessing, you can't do it.See above.
The closest thing to what you want would be using
PooledConnections, iif those are supported for the
database you want to access.Not true.
Kaj

Threaded Queries from Single static Connection object - Good approach?

Hi,
I need to generate a report where I need to query count(1) from over one hundred tables from oracle 10g database. I am not updating or deleting any record.
My approach is to use a single static connection object and create one thread for each table and capture the result back into a static hashtable.
But still, I am not getting any substantial performance improvement. Earlier, my report took 40 minutes, when it was non-threaded and now it takes 30 minutes.
Is there anything more I can do to make my report get the counts faster? Will a connection pool help?

Tolls wrote:
jschell wrote:
I was told by the DBA that count(1) works faster than count(*)....that's why....Unlikely. Certainly not true in current versions of Oracle if that is the source.Not unlikely, actually not true. Beneath the hood Oracle turns a count(1) into a count(*) in order to deal with this. Why? Because count(1) is turned into count(*) in order to avoid it being slower (Oracle 7 was the last time count(1) was different). And the reason generally given is because so many people were mistakenly using count(1) thinking it performed better that they decided to put in the "conversion" to fix the silly queries.
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I knew all that, but I missed that the OP had specified the database vendor and version.

The never ending Connecting to ISP mesage-but never happens

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Differential vs. Single-ended connection

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