Using FieldPoint Quad510 to measure PWM

Can the FP-QAUD-510 be used to measure a pulse width modulated signal? Or are we going to have to use the Analog input module?

I do not believe an FP-QUAD-510 can be used to measure PWM. The FP-QUAD-510 requires two inputs A and B and increments or decrements the position count by the changing of A and B with respect to each other (e.g. AB, !AB,!A!B, A!B). Whereas the FP-QUAD-510 does also provide a velocity reading (counts/usec), wiring a single signal to A or B and will simply result in the count incrementing by 1 then decrementing by 1 then incrementing by 1 etc... This will not yield accurate results on the velocity reading.
Depending upon the period of your pulse width signal, you may want to consider using a FP-CTR-500 or FP-CTR-502 module. The counter modules can use internal clocks to allow you to measure the on-period of the signal. If you know the signal is always the exact
same period, by measuring the on-period portion of the total period you can determine the duty cycle. If the period of the signal will vary, then you can still use a counter module, but will need to use multiple channels (one for the on-period and one for the off-period) and an external inverter on the signal (you would feed the signal into one count channel and the inverted signal into a second count channel).
Regards,
Aaron

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Hello,
i want to measure PWM came out of controller. i use labwindows to develop this task.
but when iam searching example of DQAMX inside counter examples i had found that i can measure pulse width OR i can measure period
iam asking now i need to detect PWM (pulse width and period ) and i couldn't create the two handels on the same task......
So please tell me what i can do to measure the twice at the same time
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Hello,
Characterizing the frequency and duty of a PWM signal will require 2 separate tasks. A task for pulse width measurement and frequency/period will need to be created. Each of the 2 tasks will require separate hardware counters to do this measurement; you will have to wire the PWM signal into both sets of counters for the 2 measurements to occur simultaneously.
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Dear All,
I am using Real time remote system. I am using PXI-6259 card, PXI-8184RT controller and PXI-1031 Chassis.
I want to use shared variable to measure and analog Input(voltage) from
an analog input Channel. I tried attaching it with the physical
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can any one give me any suggestions?
Screen shot of this is available.
I tried using the Acq and graph example and deployed it to the RT but
the Sine wave I input in the measurement channel becomes highly
distorted when I see it in the host.vi, there is also a Screen shot of
this also. Is there any other option.
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Sincerely,
Munir Afzal Bhatti.
Attachments:
SV2.jpg ‏2305 KB
SV3.jpg ‏2305 KB

You will have to give us the whole picture. What is your client computer; a PAC, desktop etc? What are you running on the client computer; a VI or an executable? Where are you going to deploy your library? On the host machine or the client machine?
If I assume that you are running a VI on the client machine and are depolying the library on the host, all you have to do is to create another shared variable and bind it to the variable on the host machine. You can do this by checking the Bind to Source option when creating the variable and browsing to the network item in options. Be sure to have the library deployed on the host side before you attempt to do this otherwise you won't be able to find the variable.
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I am using fieldpoint and labview to log and monitor the temperatures of my system. but i am not using Labview 6i with DSC, how can i do it??

i am using fieldpoint 2.0 and labview 6i to monitor my system, but i think i don't have labview DSC.

I have written a relatively large Fieldpoint application "just" using LV5.1 FDS, so it can be done.
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I am using IMAQ vision for Measurement Studio, Ver6.0 with Measurement Studio Base Package,Ver6.0(Professional Edition).Can I work in IMAQ Vision for Measurement studio, Ver6.0 If I upgrade Measurement studio to Enterprise Edition,ver8.0.1

I am using IMAQ vision for Measurement Studio, Ver6.0 with Measurement Studio Base Package,Ver6.0(Professional Edition).Can I work in IMAQ Vision for Measurement studio, Ver6.0 If I upgrade Measurement studio to Enterprise Edition,ver8.0.1
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Howdy Biswajit,
The IMAQ and Vision ActiveX controls you are using with Visual Basic 6 do not install with Measurement Studio. They are installed when you install the IMAQ software and include support for Visual Studio 6. Upgrading to Measurement Studio 8.0.1 will have no effect on your IMAQ controls since they are not related to one another. Purchasing Measurement Studio Professional or Enterprise packages allows you Visual Studio 6 support for other ActiveX components. Refer to this link for a list of ActiveX components included in those packages.
If you are asking about using the ActiveX controls in .NET, then take a look at this KnowledgeBase entitled Do NI-IMAQ and NI Vision Support Microsoft Visual Studio .NET?
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You might be able to get it to work (not sure how fast the DIO on the Virtual Bench can go), but for I2C, I would recommend using something that is actually meant for it, like the USB-8451 or USB-8452.
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Using Fieldpoint Explorer, I am having trouble configuring outputs on my RLY-420 and PWM-520 modules attached to an FP-1000 network module

I have noticed that I can not get my Relay module to turn off all of the channels, also I can only set the PWM modules down to ~4% output.
I have tried to "Reset" the factory defaults on the FP-1000. I've tried to configure the powerup states of the different modules, all with no luck.
I have made sure I am running with the latest firmware on the FP-1000
I did notice this problem before upgrading the firmware. Immediately after doing the upgrade the problem went away for a short while. Now it is back again.
My system is configured as follows:
1 FP-1000 network module @address 0
4 FP-TC-120 modules @1,
2, 3, 4
2 FP-TB-10 dual channel bases @ 5, 6
2 FP-PWM-520 modules @ 7, 8
1 FP-RLY-420 module @ 9
Something seems to me to be happening with my .iak file in FieldPoint Explorer, of course I could be completely off base.
I appreciate any insight anybody might have with this problem
Kerry Libberton
TDA Research
Wheat Ridge, CO

Kerry,
There are several different things that may be going on here. First of all, there may be an issue with power consumption. A network module (FP-1000 in this case) is designed to source up to 9 Watts of power to I/O modules. This assumes an average of 1 Watt per module. Certain modules require more than 1 Watt, most require less leaving extra power for the ones that require more. In your configuration, you may be over this depending upon how your FP-TB-10's are populated. Assuming that the TB-10 is unpopulated, your consumption is 4 * 0.35 + 2 * .25 + 2 * 0.6 + 1.7. = 3.8 Watts. Thus, the load from the Dual Channel modules may not exceed 5.2 Watts. If you are using exclusively the Dual Channel Analog Out Current modules, you will overload the power supply.
Anothe
r thing to look at is when resetting the network module, check the box that says factory configuration. After the reset, uncheck the box and then configure your channels and power-up values (edit this device on each module).
Also, there are some times when relays may get "stuck" in an on position due to extremely high inductive loading. I have not seen that happen very frequently, but it does make me wonder, what type of load are you driving on the relay channels?
The PWM module, has 12 bit resolution, and will accept values of 0% for the output duty cycle. What value for the period have you set?

How do I use a counter to measure frequency and multiple analog signals in the same VI?

I have a PCI-6071E, an SC-2345 with multiple modules, and a PXI-8184 (with a PXI-1002 Chassis).
My goal is to monitor pressures, flows, temperatures, and speed in one VI.
I am using Measurement and Automation Explorer version 3.1.1.3004 to manage my channels.
My speed is a PWM signal which I recently rewired through the counter 0 of my board.
I was hoping to configure this to read frequency directly in measurment
and automation, have this scale the value to RPM, and then feed it
directly in to my labView program.
In labView, it will not except this signal though.
I get error -200300 from the DAQmx Start Task.vi
Possible reasons(s):
Invalid timing type for this channel.
Property: SampTimingType
You Have Requested: Sample Clock
You Can Select: Implicit, On Demand
After doing some research, it seems that the counter wants "Implicit"
selected for the DAQmx Start Task.vi, but then I cannot use my other
channels. Also, counter is included in the "Sample Clock" option
description, so I do not understand why it is not working.
Does anyone know how to work around this problem or a way to configure the counter so that it will work in this way?
All my other channels are Analog.
Thank you.

I am working on getting just the counter working by using
the program posted previously, and I am running into issues. Periodically I get
the error:
Error -200141
occurred at DAQmx Read (Counter DBL 1Chan 1Samp).vi
Possible reason(s):
Data was overwritten
before it could be read by the system.
If Data Transfer
Mechanism is Interrupts, try using DMA. Otherwise, divide the input signal
before taking the measurement.
It seems to work better if I use cascaded counters, but I need timer 0 for
analog channels when I run this code along with the program for the other
measurements.
I have tried averaging, and selecting different values for the millisecond
timer, and these did not seem to have an effect.
I tried different DAQms configurations and "Counter DBL 1Samp" seemed
to work the best.
The program will work for a while and then it will give me the above error
message.
If I use counter 0 as a cascaded counter input, the program runs fine. If I run
this with other analog channels, it errors out because the analog channels use
counter 0.
If I use counter 1 as a cascaded counter input, it seems to work better than a
single channel, but it will still error out with the above error.
If I use only counter 1, I get the error above even faster.
Also, none of the
configurations give measurements outside the While Loop.
The only place I can add a speed dial for the front panel is within the While
Loop.
Is there someway to get the signal to continuously send out of the while loop?
I thought if I could get the signal out of the while loop, I could condition it
anyway I wanted without the program erroring out.
Any suggestions would be much appreciated.
Thank you.
Attachments:
Counter_error.jpg ‏45 KB

How to use single Timer to generate PWM PULSE, Pulse ON time measurement, Event time measurement1,Event time measurement2

Hi,
I am planning to use a single Timer to generate PWM PULSE, Pulse ON time measurement, Event time measurement1,Event time measurement2 some one please suggest me how can I achive this.
Thanks in advance..
Michael

Hi Michael,
It would be really good to understand your application a little more so that any specific needs that you have may be met. In the meantime, I would also suggest searching on ni.com for "pwm" or other keywords that relate to your application. You will see a faceted navigation on the left side that allows you to narrow your search for example code, tutorials, etc.
Please post back with more information and the community will be able to help out with suggestions.
ni.com search for "pwm"
Mark E.
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NI 5105 - Measure PWM Waveform Duty Cycle

Will the Positive Duty Cycle scalar measurement in the NI-SCOPE software calculate duty cycle correctly on a PWM (pulse-width modulated) waveform? I have a 400Hz signal that is pulse-width modulated with a 40Hz signal that I need to measure the duty cycle for. Since this is not a normal, continuous waveform (like a sine wave or square wave) I don't know if the NI-SCOPE software will correctly calculate the Duty Cycle. Has anyone tried this with success? I am looking at using the NI-5105 because it has 8 channels, but am open to using other hardware and just multiplex my signals to the digitizer.

The positive duty cycle scalar measurement should correctly calculate duty cycle on your pulse. By default, the measurement finds the base and top of your waveform using a histogram of the Y values (there will be peaks in the histogram at the base and top values). Duty cycle is calculated from the 50% level crossings between these two values. You must have at least one complete cycle and only the first cycle is measured.
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This account is no longer active. Contact ShadesOfGray for current posts and information.

Measuring PWM duty cycle with Analog Input

Hello folks,
I have a NI 9205 module and was wondering if there was a way to measure the duty cycle of a PWM signal that I am generating with a separate microcontroller? I have found a lot of examples with Digital inputs but not analog.. Is this possible?
Thank you,
Bob

Hi Robert,
I'm not sure what that error is, try searching for it.
If you want to measure a PWM signal you would usually use a counter input. A counter is a dedicated piece of hardware that is used to measure digital signals. Since the NI 9205 is an analogue device and it doesn't have any counters onboard, you will not be able to select counter input.
I would recommend you get the right tools for the job and buy a digital acquisition device with an onboard counter. It will make reading PWM much easier for you. The NI 6008 has a counter onboard and is only £99. It will also offload processing from software to hardware since you don't have to calculate duty cycle.
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Lewis Gear CLD
Check out my LabVIEW UAV

Using FieldPoint to control step motor

I am having problem positioning a step motor. Here is what I am using.
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=====
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-AK2DM
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"It’s the questions that drive us.”
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Using FieldPoint Quad510 to measure PWM

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