How to measure the resistnace of wire without any current input by lab view and DAQ-9172

i want to measure the resistance of the SMA wire without any current in put by LAB view and DAQ-9172 any body help me

You could measure the time constant of a resistor/capacitor series circuit. Basic electrical engineering: http://en.wikipedia.org/wiki/RC_time_constant

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How to check the existence of file without any error dialog?

Hi everybody,
I am trying update some labview programs from LV6.1 to LV7.1, I used the
function "File/Dictionary Info" to check if the file
exists or not (if the size=0 then file does not exist), and it ran well with
LV6.1, but now it shows every time a labview error dialog
about "LabView: file not found..." with 7.1, if this file dosn't exist.
Sometimes I feel that it is really stupid to show the dialog, because I
can write handling by myself, if the error should be handled, and
I don't want all the process is interrupted because of such dialogs. Is
there any way to shut the dialog down or check the existence of
file smoothly?
Thanks a lot!
L.Wang

Hello,
The dialog is probably appearing because you have Auto Error Handling turned on. This feature is turned on by default in LabVIEW 7.0. You should go to VI Properties (Ctrl-I) > Execution and deselect "Enable automatic error handling". Also you should go to Tools > Options > New and Changed in LabVIEW 7.x and deselect "Enable automatic error handling in new VIs". If you never want to see one of those dialogs again, you can also deselect "Enaeble automatic error handling dialogs"...I wouldn't recommend this, however, as you would never know if one of your VIs had this setting enabled...you would only find out once somebody else tried to use your VI on another LabVIEW install.
-D
Darren Nattinger, CLA
LabVIEW Artisan and Nugget Penman

How to measure the baseline of a noisy, pulsed signal

Hi
I am measuring the torque exerted by a large motor on a shaft using a load cell and lever arm. The shaft runs at approx 150 rpm. I have attached a drawing that shows the output I get. This is a test rig.
I have written some code that measures the maximum peak out of a group of approx 5 peaks and writes this to a shift register. This gives me an idea of the maximum torque "spike".
I also wish to measure the baseline torque (due to the bearings in the machine). Even when highly filtered (my noise filter is set to 49Hz) the signal exhibits this noise which is probably due to vibration in the system. The signal is zeroed when the motor is not running.
Does anyone have an ideas on how to measure the "baseline" torque? The large spike in torque prevents me from doing a running average. Can anyone think of a way of averaging just the noisy part of the signal to get an average value? I aim to to subtract the average baseline torque from the peak value to get an idea of the torque due to the event which causes
the spike.
Any help would be greatly appreciated.
Many thanks.
Attachments:
drawing of torque signal.gif ‏26 KB

Thanks for the reply. I understand what you are saying. However, I might have to modify my method for measuring the peaks if I choose to implement your idea. I have taken a screenshot of my "peak finder" code and attached it.
Bascially, the reset terminal is wired to a timer which outputs a pulse every few seconds. This resets the vi (a standard NI one I think) and sets the peak magnitude back to zero. This way, I am windowing the signal and measuring the maximum peak in every window. This is what I need to do.
So I could use a logical filter to feed data to the running average only if;
the amplitude of the signal is less than a certain threshold
and if the current value has similar low peaks either side of it
How would you construct the code to delay the evaluation so that the values in front and behind of the current data point can be analysed?
thanks again
Attachments:
peak_find_screenshot.jpg ‏45 KB

How to measure the performance of Extractor

Hi,
How to measure the time taken to by the extractor when executed from rsa3 for a given selection?
Lot of threads speak about ST05... but these transactions are too granular to analyse.
How to get the overall time taken.i need the overall time taken and the time taken by the individual SQL statements... please provide specific pointers.
Thanks,
Balaji

Maybe SE30 can help you....
Regards,
Fred

How to measure the performance of sql query?

Hi Experts,
How to measure the performance, efficiency and cpu cost of a sql query?
What are all the measures available for an sql query?
How to identify i am writing optimal query?
I am using Oracle 9i...
It ll be useful for me to write efficient query....
Thanks & Regards

psram wrote:
Hi Experts,
How to measure the performance, efficiency and cpu cost of a sql query?
What are all the measures available for an sql query?
How to identify i am writing optimal query?
I am using Oracle 9i... You might want to start with a feature of SQL*Plus: The AUTOTRACE (TRACEONLY) option which executes your statement, fetches all records (if there is something to fetch) and shows you some basic statistics information, which include the number of logical I/Os performed, number of sorts etc.
This gives you an indication of the effectiveness of your statement, so that can check how many logical I/Os (and physical reads) had to be performed.
Note however that there are more things to consider, as you've already mentioned: The CPU bit is not included in these statistics, and the work performed by SQL workareas (e.g. by hash joins) is also credited only very limited (number of sorts), but e.g. it doesn't cover any writes to temporary segments due to sort or hash operations spilling to disk etc.
You can use the following approach to get a deeper understanding of the operations performed by each row source:
alter session set statistics_level=all;
alter session set timed_statistics = true;
select /* findme */ ... <your query here>
SELECT
         SUBSTR(LPAD(' ',DEPTH - 1)||OPERATION||' '||OBJECT_NAME,1,40) OPERATION,
         OBJECT_NAME,
         CARDINALITY,
         LAST_OUTPUT_ROWS,
         LAST_CR_BUFFER_GETS,
         LAST_DISK_READS,
         LAST_DISK_WRITES,
FROM     V$SQL_PLAN_STATISTICS_ALL P,
         (SELECT *
          FROM   (SELECT   *
                  FROM     V$SQL
                  WHERE    SQL_TEXT LIKE '%findme%'
                           AND SQL_TEXT NOT LIKE '%V$SQL%'
                           AND PARSING_USER_ID = SYS_CONTEXT('USERENV','CURRENT_USERID')
                  ORDER BY LAST_LOAD_TIME DESC)
          WHERE ROWNUM < 2) S
WHERE    S.HASH_VALUE = P.HASH_VALUE
         AND S.CHILD_NUMBER = P.CHILD_NUMBER
ORDER BY ID
/Check the V$SQL_PLAN_STATISTICS_ALL view for more statistics available. In 10g there is a convenient function DBMS_XPLAN.DISPLAY_CURSOR which can show this information with a single call, but in 9i you need to do it yourself.
Note that "statistics_level=all" adds a significant overhead to the processing, so use with care and only when required:
http://jonathanlewis.wordpress.com/2007/11/25/gather_plan_statistics/
http://jonathanlewis.wordpress.com/2007/04/26/heisenberg/
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

CIN: How to check the material document posted without excise invoice

Hi Guru,
Please advise how to check the material document posted without excise invoice.
I have tried tcode J1I7 but it seems start to collect the excise invoice first and then material document.
But my case is to find the material document WITHOUT excise invoice for internal tracking purpose.
At the moment we start from tcode MB51 to get the list of material document and check in J_1IEXCHDR / J_1IEXCDTL
Best regards,
Pakorn

Hi,
Try creating a Query in Tcode SQVI by combining tables MKPF and J_1IEXCHDR/J_1IEXCDTL for your requirement.
Check these threads how to create Query.
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/6018c1ae-8c44-2d10-6ea9-c3fad2c82880?QuickLink=index&…
http://ptgmedia.pearsoncmg.com/images/9780672329029/samplechapter/0672329026_CH03.pdf
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Binoy

How to measure the size of a table ?

Dear all,
May I know how to measure the size of a customized table. I have a list of customized table and I want to monitor the growth of the table size on daily basis.
Please advise how do I do it.
Your advice and input will be appreciated.
Thanks.
Regards,
Kent

Go to DB02 -> Detailed Analysis -> Enter the table name under "Object Name" -> Click history to see the changes in size by day.
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Juan

How to measure the size of a string

windows app store how to measure the size of a string?
string str = "Hello word windows app store";

if you need the actual width the string occupies in pixels than use (see
this MSDN link for more details):
Graphics.MeasureString(String, Font)
if you only need the "length" of the string i.e. no. of characters than use (see
this MSDN link for more details):
str.Length
dont forget to bing / google :)
hope this helps!
Graphics.MeasureString(String, Font) can not use in windows store app.
TextBlock has Measure()
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Size MeasureString(string content, Size availableSize, double fontSize, string fontFamily="Segoe UI")
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string str = "Hello word windows app store";
Size size = MeasureString(str, new Size(800, 600), 40);

How to measure the InfoCube size?

can any body help me regarding this
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Re: how can we measure the info cube size
2. asap methodology
Re: Lifecycle Implementation
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harikrishna N

How to measure the size of an object written by myself?

Hi all,
I'm going to measure the performance on throughput of an ad hoc wireless network that is set up for my project. I wrote a java class that represents a particular data. In order to calculate the throughput, I'm going to send this data objects from one node to another one in the network for a certain time. But I've got a problem with it- How to measure the size of an object that was written by myself in byte or bit in Java? Please help me with it. Thank you very much.

LindaL22 wrote:
wrote a java class that represents a particular data. In order to calculate the throughput, I'm going to send this data "a data" doesn't exist. So there's nothing to measure.
objects from one node to another one in the network for a certain time. But I've got a problem with it- How to measure the size of an object that was written by myself in byte or bit in Java? Not.

How to measure the task instance size

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Hi, Luiz!
In order to estimate the instance size, you will have to sum up all the instance variables size.
From the practical prospective it may be difficult to use the algorithm in cases when your instance variables are not simple types.
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An instance is just a java object, that is serialized as a byte[] and stored in the engine database, PPROCINSTANCE table, column INSTDATA.
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How to measure the SNR?

Hi, everyone , I want to measure the noise power and signal noise ratio by usrp. How can I do this accurately ? for example, when this is no signal , I acquire the samples from usrp , and sum the square of the sample then average , whether is the way to get the noise power? and how can I measure the SNR? Is there any example about this ? thanks

Hey HustLiliAn,
Here are 2 other forum posts that had good responses about SNR and VIs that can be used to take the measurement:
http://forums.ni.com/t5/LabVIEW/Signal-to-Noise-Ratio-SNR-measurement/td-p/99326
http://forums.ni.com/t5/LabVIEW/how-to-calculate-signal-to-noise-ratio-from-the-graph/td-p/813558
If you are looking at the average power, SNR is just Psignal/Pnoise. If you are looking at the amplitude of your signal, then you need to look at the RMS amplitude. In that case you would use the formula (Asignal/Anoise)^2.
Sarah Y
SDR Product Manager
National Instruments | Ettus Research

How to extract the mouse cursor image without using JNI

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How to keep the watch to display without press the button on my iPod Nano 6th)?

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How to measure the duration

Hi all
I would like to know how to measure the duration for which the "over temperature" is in on state in the example "Temperature system Demo.vi"
i would also like to measure the transisent in a sine waveform.
thanks in advance.
with regards,
McFerra
Attachments:
Temperature System Demo.vi ‏49 KB

Hi McFerra,
Find the attach vi that can solve your question..
enjoy..
DoN't FoRgEt To cLiCk KuDoS.....!!!
Greeting from India,
Malhar
Attachments:
Temperature System Demo.vi ‏46 KB

How to measure the resistnace of wire without any current input by lab view and DAQ-9172

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