How can I measure RPM with CTR-500 module?

I have used the CTR-500 module for mesurement of motor RPM. But it doesn't have direct option to measure RPM ,
so i have count pulses for 1sec (then reset the counter) and by calculation show the result for 1min. But it varies every time ,cant give me fix RPM.
I want reliable solution for this.

min
You have not said how much the RPM actually varies from reading to reading and what the range of measured RPM is for the process. This variation can be caused by a couple of things. One would be actual variations in RPM due to changes in motor loading. What is this motor driving? Most RPM readouts use some form of sample averaging to smooth out the readings.
A second cause could be your vi. Suggest you post a copy of your vi.
In case you have not seen it, here is a link to a KB about measuring frequency with cFP. It also links to several other docs on the same subject . http://digital.ni.com/public.nsf/allkb/D8DB42F9FDC3607E862568640047F144?OpenDocument

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What is ARIS Tool? &How can we use it with SAP MM module implementaion?

Dear Friends /Consultants /Seniors of the SAP forum,
1.What is ARIS Tool?
2.What is the purpose (actual need) of this tool? And is it useful to SAP MM
Consultant during the SAP Implementation? or support? or rollout? or upgrade?
3.For which Business Process SAP Implementation, this Tool (ARIS) can be implemented? ( I mean for which industry sector this tool can be implemented or used)
4.Pls explain any business Senario using this ARIS Tool for SAP MM module implementation...
5.Is this a thirdparty tool, or who's product it is?
6.Being a SAP MM Functional Consultant, how can we utilize it during the SAP MM Implementation.
Pls do the needful,
Regards,
Srinvias.K
Message was edited by:
        sapsrin

ARIS - stands for ARchitectur Integrated Systems.
This is proprietary tool fof IDS Sheer AG,
In layman's words we can say its a tool create Flow charts.
In business we don't say these as flow charts but as EPC chains.
EVENT PROCESS CHAIN
This is a Designing tool of any kind of activity,from 4.6b ( i guess) SAP has Plug in to ARIS tool even.
For eg: If i wanna go and buy Sandwich,eat and come back to home.
its vey simple to say but if you map this in EPC.. there are lot of things come in picture.
steps
1) I get up from desk
2) Walk out of thehouse
3) Start my car
4) drive my car to XX place
5) I buy sandwich
6) Should i eat or carry out
if eat - pay for it
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     eat sandwich
      get out towards car
      drive back to home
If Carry out
Pay for it
get out towards car
drive back to home
Eat sandwich...
it still depends on how micro level control you need .
for eg: in the above process we can also include
1) pick up my car key
2) Wear shoes etc etc....
Basic aim of this tool we donot miss any event ,and to have standard predefined process flow.
If some one has better answer, please let me know.
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Hi folks,
Can anyone tell me a way to measure RMS voltage with the AI-102? I need to measure 0-1 VAC. It seems like there should be a way to collect a sample of voltages and put them in an array to calculate RMS. Since I'm not approacing the limit of the module's voltage range, there shouldn't be any danger of clipping the signal.
Has anyone out there attempted this?
Thanks,
Eric

Hi!
I've never worked with an AI-102, but from the specs I see there's an update rate of 2.8 ms (quite slow...), for a bandwidth of 170 Hz, so the main question is: what frequency band your input signal lies in? Is it slow varying?
If your signal's frequency is low enough (I'd suggest below 100 Hz, below 50 is better), you can simpli sample voltage and average samples over time (maybe with some clever techniques...).
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graziano

Can I measure voltage with a current module by removing the resistor?

I'm trying to measure a 0-10 VDC signal and I don't have any voltage throughput modules for my 2345 signal conditioning unit. I do have some SCC-CI20 (4-20mA) input modules that use a 249 ohm resistor. The output from these modules are 1-5 VDC as expected. I'm wondering if I remove the resistor do I not have a voltage module?
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Thanks

Hi,
Yes, you can use the CI20 module to read in voltages. Connecting a voltage source in parallel with R3 will result in the same potential drop to appear across the R3 resistor (see diagram attached).
Make sure that you DO NOT configure the CI20 in the Measurement and Automation Explorer, so you can read the raw voltage. Also DO NOT supply more voltage than 5V, or you might damage the module.
Hope this helps,
Lesley Y.
Attachments:
CI20 Connection for Voltage.gif ‏38 KB

Can I measure frequency with a SCXI-1120 module and SCXI-1320 terminal block?

I am attempting to measure a square wave from a directional encoder to display RPM of a dynamometer. The waveform will have a frequency of 0-4KHz, with 3.6KHz being nominal, at about 5volts RMS. How can I measure the frequency of this waveform with the hardware I am currently using? In addition to what is listed above, I am using a PCI6034E GPIB card and LabView software.

In order to measure frequency, I would not recommend to use the SCXI-1120, but the SCXI 1126, which is a programmable isolated F-to-V module.
If by any reason you do not want to use SCXI-1126, then I would suggest to use the counter/timers of your board. The counter/timers are TTL compatible, and are the devices that we mostly recommend for doing precise frequency measurements.
In order to have access to the counter/timers of your board through your SCXI chassis, you will need SCXI-1180, which is basically a feedtrhough panel for your DAQ board.
Once we have access to the counter/timers through the SCXI chassis, we can proceed with the coding.
I found a pretty good webpage that clearly explains how to perform frequency measurement with the DAQ-S
TC counter/timers (DAQ-STC is the type of counter/timer chip that you DAQ device has). Here is the link to it:
Pulse Width & Frequency Measurements
As you will see, this link contains tutorials, application notes and example programs. I would recommend to pay special attention to the example program called: DAQ-STC: Measuring frequency.
Good luck with your application!

How can I measure the hertz in a wave form?

How can I measure the hertz in a wave form?

As an example, this is from BBC Technical Requirements for HD material:
3.1.1 Stereo line-up tones
All stereo tracks must use EBU 1KHz tone (left ident). All tones must be sinusoidal, free of distortion and phase coherent between channels.
Digital Audio Reference level is defined as 18dB below the maximum coding value (-18dBFS) as per EBU recommended practice R68.
See also:
http://www.bbc.co.uk/guidelines/dq/pdf/tv/tv_delivery_to_network_programmes_v1.2-2011.pdf
for full document.
And for BBC Radio:
Not every Network requires tone. Check the delivery requirements with the commissioning network or click here.
Reference tone, where used, should be at -18dBFS or PPM 4 on A, B and/or M.
If submitting material with reference tone, tone and programme material must be have been monitored and measured through the same technical chain. The level of the tone must be equivalent to 0dBu and no less than 8dB below peak audio level for the programme material.
THE LEVEL OF TONE MUST HAVE A KNOWN RELATIONSHIP WITH THE LEVEL OF THE PROGRAMME MATERIAL AND THIS MUST BE STATED; for example: “Tone at 8dB below peak programme level”.
As a newcomer to digital sound (my background is camera) I confess to being somewhat confused. We are normally told to record at the highest level possible. So for voice podcasts I tend to record at about -6dB below peak for maximum volume, distributeds on MP3 files.
But I can underatand that televison and radio especially for analogue transmission) may have limited headroom, hence the requirement for -18dB peak = 0dBM.
I remember when we first rented out Digital Betacam cameras, some recordists were recording almost everything OVER -18dBM.
I suspect that until we have an all-digital world, these requiremnents will still be in place.
Many thanks to all. It's a ghreat community!
Brian Rose

How can I count time with labview7?

Hi
How can I count time with labview 7 and NI-DAQmx like I did with labview 6.1 and "count time-easy.vi" (count event or Time.vi).
I have a 6025E and labview 7.0
Thanks

I am not sure what you want to do or why..
... but here goes (some suggestions)
If you want to count the time between two events, you have a choice, you may use the Tick Count. Inisitalize it first by getting a timestamp and then do a difference within a loop. The difference will give you the time elapsed in ms.
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Hello,
How can I measure the Graphics Card usage, like with the processor in Task Manager, but instead giving a percentage usage for the graphics card instead? Is there an easy way to do this, or would it require a lot of code? Is it even possible?

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We built a web application that enables images to be loaded into a database through a servlet running on Tomcat. We have inconsistent behaivor when more than x number of people are loading images simultaneously. No doubt a memory allocation problem, but how can I measure it?
For example, I'd like to be able to create a graph showing the resources used against the number of people making uploads. I am using Linux and Tomcat/Apache.
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Runtime.getRuntime().freeMemory()
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i am making afire fighting robot that us camera to detect the fire i made the vi which find the fire through match pattern but now i want to measure the distance between the camera (which on th robot ) and the fire (which located in the image using match pattern) so how can i measure this distance?
khaledyr

Ok... this is sad, I should be asleep now instead I'm here thinking about this problem.
I've worked out how to do the distance caluclation with no extra H/W and only 1 camera - as Henrik said, the standard solution is triangulation, but you just want to measure distance, so I'm going to assume you're already pointing in the right direction.
Assumptions:
1) It is usual to use triangulation to to measure intenisity, this is because light will have 2 different distances to travel from source to sink.
2) It is possible to use 1 sink if you use mirrors to increase the path of the light so you can have 2 seperate source -> sink distances.
3) having 2 cameras (sinks) next to each other, one covered with a physical filter would have the same effect as the amount of light reaching the 2 sinks from the source will be different.
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Hope this provides more food for thought.
James
P.S. Lynn - currently a firefighter and worked for the emergency services ehh? Always good to see your posts when you have something to add. (Firefighter / Software programmer - what's the difference?)
Message Edited by James W on 04-22-2010 10:56 PM
Message Edited by James W on 04-22-2010 10:56 PM

How can i measure the speed of the fan in sound and vibration signal simulator box

how can i measure the speed of the fan in sound and vibration signal simulator box
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Hi. I tried your suggestion and I could not get it to work well. In
fact it worked better without the running average (which suprised me).
I also played with the number of data points but still could not get it
to work well.
Do you have any other suggestions on how I could sort this problem out?
I
have attached a screen shot of the signal. To recap, I'm trying to
measure the'y' position of the flat regions of the signal. The signal
does not have a constant level, so this 'y' position varies with time
in a non-unform manner.
I am currently differentiating
the signal and selecting the y position when the differential is equal
to zero (within a tolerance band).
In the screenshot, the
signal has been zeroed using the method I have described above.
However, it occasionally has glitches which may be caused when the code
picks up a zero gradient at a peak or valley in the signal.
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John
Attachments:
screenshot.gif ‏121 KB

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<Re-Titled By Host>

How can I start anew with Photos and clear the (minimal) stuff it has uploaded (about 6000 of 19,000 images in the last 7 days) ? If I simply delete the Photos.photolibrary file will that do the trick and lt me start a new fresh library using?
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If I simply delete the Photos.photolibrary file will that do the trick and lt me start a new fresh library using?
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How can I measure RPM with CTR-500 module?

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