How to multiply the measured signal with exp(-t/T) and integrate it?
For my optimum filtering, I should multiply the measured signal S(t) with exp(-t/T) and integrate these from 0 to tmax. Here, T is the time constant tau.
Does anyone know how to do it in LabVIEW?
Sorry, this slipped off my horizon ...Thanks for the reminder.
OK, while I don't understand the reasoning behind the algorithm, I have implemented Case (1) and Case (3) with a simple demo using static data. It's just simple math, nothing fancy.
(I haven't fully tested these, so there might be bugs. They are in LabVIEW 7.1, do you need a lower version?)
LabVIEW Champion . Do more with less code and in less time .
Attachments:
IntegralFilterDemoCase1.vi 40 KB
IntegralFilterDemoCase3.vi 62 KB
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Hi,
I was wondering how to convert a complex baseband signal with bandwidth 20MHz to an RF signal with center frequency 2.4GHz and the same bandwidth 20MHz in simulation. I tried
1. Multiplying the complex double type baseband signal (1-D array) by exp( j * 2 * pi * 2.4E+9 * T ) where T is the symbol period of baseband signal.
2. Usage of MT upconvert baseband but doesnt keep the BW constant
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My system
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PXI 8196 RT controller
Flexmotion 7356 motion controller
Flexmotion 7354 motion controller
6259 M series DAQ
1520 SCXI
1520 SCXI
1314 SCXI frount mounting terminal block
DSM strain gage load cells
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I want to measure the force on the load cells with the 1520 SCXI (i.e. excite the load cell then amplify and condition its output) then I want to use this analog (force) signal as the primary feedback for my motion control system (7356 and 7354 motion controller connected to my drives and motors).
The problem:
The motion controller boards (7356 and 7354) can be configured for force feedback control via analog feedback from a load cell. However the boards implicitly expect the load cell signal to be amplified and conditioned with and external signal conditioner rather then using an NI SCXI module. Currently I’m am reading the SCXI signals via the 6259 M seriers DAQ and consequentially have no way to route the signal into the 735X boards for force feedback control. I can use softmotion to control the motors but then I loose the fast PID update rates possible with the 735X boards.
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Is it possible to condition a load cell signal with a 1520 SCXI and then use it as the primary analog feedback for a 735X motion control board?
Thanks
Patrick Aubin
Ph.D Candidate
University of Washington &
VA MedicalCenter of Excellence for
Limb Loss Prevention and Prosthetic EngineeringHi GG,
Thank you for your feedback.
>create your own external circuitry to amplify the signal.>
True a few op-amps could amplify and filter the signal externally but the performance of such an amateur built system will never match the accuracy and functionality of the 1520 SCXI. That’s why we spent the $2500 for the professional version.
>One thing that you could do is to use a UMI with your motion controller and then wire your signal from your SCXI to the UMI.>
As I understand it the UMI is basically a break out connectivity interface for third party drives. After conditioning and amplifying the analog force signal with the SCXI module the analog signal isn’t available to wire into a UMI. To my knowledge the conditioned signal of the SCXI resides only in the PXI backplane (i.e. there is no physical access to the conditioned analog signal). Can you explain how the UMI could be help here.
Again thanks for your input GG.
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How to control the measure based on the related dimension.
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< Edited by Host > -
How to synchronize the FieldPoint time with my computer time?
When I using MAX to read the values from my FieldPoint cFP-1804 module, there is and timestamp generated for every measurement, but it does not match my PC's system time. How to synchronize the FieldPoint time with my windows PC?
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In order to obtain an updated timestamp with each FieldPoint Read, you should
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Message Edited by Pie56694 on 08-15-2008 05:58 PM
Attachments:
TSUpdates.jpg 38 KB
FlatSequence.jpg 54 KB -
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