Can we acquire the Analog input and Digital Input at
Can we acquire the Analog input and Digital Input at
the same time? My sensor data include Analog and
digital signals.
Hi Chenchen,
It usually simplifies things greatly if you use analog inputs to monitor both the analog signals AND the digital signals.
If you abosulutely HAVE to use digital lines, then the answer is, DEPENDS....
With the correct hardware and depending on how fast you want to collect data and how closely the measurements have to be syncronized in time, it can be done.
But first, concider using analog inputs to monitor all signals.
If you need to move forward with both analog and digital acquisitions, then post a new quesion and give us details on the hardware you are using and the other details we will need to advise you.
Trying to help,
Ben
Ben Rayner
Certified LabVIEW Developer
www.DSAutomation.com
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction
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How can I syncronize the analog input?
Thank you!Ahh! You are doing this on the DSP itself. That would explain the Express VI problem, since you probably do not have floating point available. A simple level trigger is not hard to code using integer math. You can use the VIs I mentioned above as a guide (the algorithms should work well with integers as well as floating point) or just do it yourself. A possible algorithm for a positive going edge trigger is the following:
Search array until first point is less than level and second is greater than or equal to level (use In Range and Coerce to search).
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This account is no longer active. Contact ShadesOfGray for current posts and information. -
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Can the analog inputs of a PXI-6289 be connected in series to measure higher voltages than normally allowed at the analog inputs of the PXI-6289 (i.e. 10 VDC)? For example, let's say I wanted to measure 18 VDC using an analog input channel of the PXI-6289. I would then pick two AI channels and connect the positive of one to the negative of the other and then the two remaining leads would be placed across the 18 VDC. Resistors could also be placed across the 18 VDC to form a votage divide. One AI would measure the voltage across one resistor and the other AI would measure the voltage across the remaining resistor. I have tried this and the voltage measurements appear to loose accuracy. Thank you for your help.
Hello Rafi,
You may want to invest in a high voltage attenuator for signal conditioning prior to reading the signal. The documents below may also be helpful:
High Voltage and Isolated Measurements
http://zone.ni.com/devzone/cda/tut/p/id/10693
High-Voltage Measurements and Isolation
http://zone.ni.com/devzone/cda/tut/p/id/3410
Regards,
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hey guys ! I use logic pro ... not logic proX ... and i want to record my drums with 4 mics. I got a mixer with also 4 inputs ( Behringer Xenyx QX 1202USB ) But in my Logic i can't take the third input !?!? i can only choose 1 and 2 .... Please Help
Friedrich sp wrote:
Can you send me a mixer wich can do that, please ?
Who do you think I am? Santa Claus?
What you need is not a mixer, but an audio interface with at least 4 mic inputs. There is a lot of choice there, but you should indicate a budget. You can go from, say, € 300 to € thousands, if you want.
Roland UA 1010
Focusrite Scarlett 18i8
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I am using the PCI-7344 to control my system. The analog inputs are connected to the output of my system while the analog outputs serve as feedback to the system. The system is a servo. I want to know what is the conversion between the voltage read at the input, to card counts, and finally to the voltage output to the system.
Carole,
If you are trying to do analog feedback with a servo motor, Chapter 14 of the manual talks about how to set up the torque feedback. Also linked below is a LabVIEW example of analog feedback.
Chapter 14
NI-Motion User Manual
Automatic Analog Feedback with FlexMotion example
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National Instruments -
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With PXI remote control kits, you can control PXI systems directly from desktops, laptops, or server computers.
What Is PXI?
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I am using the data to develope transfer functions.
The simple answer is to put the 2 channels of interest in the Channel Control of your VI. Separated them with a comma.
To be honest your question is not very specific. There must be hundereds or thousands of ways to simultaneously acquire 2 analog inputs.
Try looking at the example VIs that ship with the software. Use the Find Examples function of the startup page for LV. Familiarize yourself with the information there and try some likely ones out. At this point you may have some more specific questions to ask.
The descriptions of the VI's are sometimes hard to read, but are usually enough to operate the VI.
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how to control the microphone volume input via LabView
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