Incorrect pulse reading

I'm reading a digital input from a light sensor that pulses when a three-bladed fan rotates (3 times/rev). This pulse is only appearing on screen as about once every 4 seconds even though the motor is rotating at near 8000rpm. (400 pulses/second) I have tried to increase the frequency of samping but the DAQ assisstant only lets me choose "1 sample on demand" Does anybody know how I can overcome my problem? Also i would like to convert the pulses into angular veloicty but I am having trouble. I don't know how to measure the time between pulses. If anyone has any ideas, they would be greatly appreciated.
Tom

Hi Tom,
I've already posted an answer to your questions on another thread, which you can find here:
http://forums.ni.com/ni/board/message?board.id=170&message.id=175097#M175097
What DAQ card are you using, and what version of the DAQmx drivers?
Regarding the pulses, what do you think is the duty cycle of the pulses coming from the LED (ie, what's the 'on' time relative to the 'off time'). You'll need to know this to enable you to set the correct sampling rate.
For example, consider your fan rotation as 300 sample 'steps', and the LED beam is broken for 10 'steps' for each fan blade (assuming 3 fan blades) - to reliably 'see' the beam breaks you will need to sample at the very minimum 30 times per revoultion, if possible more. Therefore, if the max speed of your fan is 8000rpm, you'll need to take a very minimum of 8000/60 = 133 revs worth of samples a second, or 133x30 = approx 4000 samples per second to reliably read the speed at the maximum velocity.
To calculate the time difference between pulses, you could try using the Timing and Transition Measurements Express VI (which can be found on the Express VI sub-palette), this VI can return various properties of the signal you feed it, including the period, frequency, pulse duration and duty cycle.
I hope this helps, as I suggested on the other post you may be better off using the counter function if your board supports it. Links to sections of NI’s website discussing the use of counters can be found on the other thread (see link above).
Best wishes,
Mark
Applications Engineer
National Instruments

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import com.tangosol.io.pof.PofReader;
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* @author apanwa
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import com.tangosol.io.pof.EvolvablePortableObject;
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import java.util.Date;
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7)   Set the lag out time as a percentage of the pulse width. Default 20%
8)   A check box that will invert the pulse.

Incorrect print head

Canon printer MG5370 unable to print with message given: UO52.
A 15 months old printer should not have this problem.

A lot of Canon printer’s users come across with the error message, “U052 This type of print head is incorrect.” It is a very common error on Canon printers and is fairly easy to troubleshoot.
There are two different scenarios related to U052 kind of error message.One is where the print head is not installed at all and then it is giving the ‘U052 This type of print head is incorrect’ error message.
And, the second scenario is where the print head is installed nut it is not functioning properly or probably not working at all. The below section will show step by step troubleshooting of both the scenarios.
Step By Step Guide to Resolve “U052 This type of print head is incorrect.”

How to measure the period of each consecutive pulse in a pulse train?

Hello all,
   I am trying to measure every pulse period in a infinite pulse train. the pulse is actually from a encoder(360 pulse per rev) connected to a varing speed shaft. The mean speed is around 6000 rpm at the highest point, and it has periodic variation, this is why I want to measure the instantaneous speed.
   I tried to use A signal of encoder (360 pulse per rev) to connect to CI Period measurement terminal and read 360 sample at a time. but it seems more than half of pulse reading are missing, which looks like that the read vi need some time to finish the measurement of every pulse before it can handle next one, cause it miss some pulse. The A signal I injected is around 10 KHz. Does my PCI-MIO-16E-4 or DAQ 6036 capable to handle this task?
thanks
Feilong

Hi Conseils,
   Thanks for your reply. I took a look on that discussion thread and started to study the "continously semi period buffered measurement.vi". I set a signal generator which gives 7 pulses once you press its trigger button to verify if that code could pick up all the resault. The frequency is set to 3KHZ.
I also modified that vi a little bit to explicitly set DMA transfer and changed it to finite sample mode with 6 samples at a vi run.
The min T value I input was 0.000028 s and max is 0.00042 s, which gives a engine rpm range of 400 rpm to 6000 rpm at 360 pulse per rev.
And I input 4 into "sample to read" control.
When I run the vi, after have signal generator output pulses, there's error:
Error -200278 occurred at DAQmx Read (Counter 1D DBL 1Chan NSamp).vi:1
Possible reason(s):
Attempted to read a sample beyond the final sample acquired. The acquisition has stopped, therefore the sample specified by the combination of position and offset will never be available.
Specify a position and offset which selects a sample up to, but not beyond, the final sample acquired. The final sample acquired can be determined by querying the total samples acquired after an acquisition has stopped.
Attempted to Read Sample: 6
Property: RelativeTo Corresponding Value: Current Read Position
Property: Offset Corresponding Value:
    It looks like the sampling procedure stops before the read.vi get enough (was 4 in this case) sample. But the sample I injected was 7 in total and the finite sample property was set to 6, which should satisfy the property of number of sample to read in read.vi.
    Could you please tell me where I am going wrong?
Many Thanks
Feilong

Incorrect print orientation

I have a HP 7610 printer. Over the past week I try to print in portrait and the output is landscape and vice versa. I have checked Page Setup settings and the problem remains unresolved. The problem is the same with my MBA and iMac.

Also, just tried to print from another MBA, same problem.
That points to the image file itself. The orientation tag that is added by the camera appears to be incorrect. Where are these photos from? Were they edited in a 3rd party editor?
What orientation do the photos take when dragged onto a blank Safari window. Correct or incorrect?

Incorrect pulse reading

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