I want to replace a hardware strip chart recorder in my l

[Himanshu]

ab using LabVIEW, I can not decide which model to use Simple Data Logger or Cont. Acquisition to Spread Sheet File,the analog voltage is in the range of 10mV and is mixed with noise,I also want to syn the LabVIEW chart speed with the hardware chart speed??LabVIEW 6i,Output voltage from Photo Multiplier tube,Pentium 2..

[Melissa Niesen]

ab using LabVIEW, I can not decide which model to use Simple Data Logger or Cont. Acquisition to Spread Sheet File,the analog voltage is in the range of 10mV and is mixed with noise,I also want to syn the LabVIEW chart speed with the hardware chart speed??Without any modifications, the Simple Data Logger only lets you take samples at a rate of one sample per second or slower. I am not familiar with a "Photo Multiplier Tube" but it sounds like something relatively fast, but that is something you have to judge. If you don't want to do any modifications, I would use the Continuos Acq. to Spreadsheet File VI. Setup a channel in the Measurement and Automation Explorer so that you are reading in the right voltage range. Choose that channel from the "channels" list in the VI. You'll need to set the scan rate so that you are sampling a good deal faster than the signal your are measuring.

[Himanshu]

ab using LabVIEW, I can not decide which model to use Simple Data Logger or Cont. Acquisition to Spread Sheet File,the analog voltage is in the range of 10mV and is mixed with noise,I also want to syn the LabVIEW chart speed with the hardware chart speed??The hardware strip chart recorder moves 1 mm in 2sec. 1mm is the minimum division on the strip chart recorder. If that is the case then how do I decide the scan rate??

[PdB]

ab using LabVIEW, I can not decide which model to use Simple Data Logger or Cont. Acquisition to Spread Sheet File,the analog voltage is in the range of 10mV and is mixed with noise,I also want to syn the LabVIEW chart speed with the hardware chart speed??Writing speed of your HW-stripchart is irrelivant.
Your problem is that you convert a continous analog measurement with a sampling digital measurement.

If you can find out (this depends on the demands of the people that use/process your data) what is the fastest phenomenon they are interested in (in terms of frequency or time), multiply that by a factor, say 4 and you have your sample-rate.
Some input signals that you measure can be very short-lasting by nature.
The mechanical and electrical character of a HW stripchart enbles you to show short but very high/low signal changes.
You could mimic this by filtering the input of your ADC measurements.
If not then you have to increase your sample-rate to catch the spike.
Hope this helps
.

[chutla]

ab using LabVIEW, I can not decide which model to use Simple Data Logger or Cont. Acquisition to Spread Sheet File,the analog voltage is in the range of 10mV and is mixed with noise,I also want to syn the LabVIEW chart speed with the hardware chart speed??Greetings:

Simple data loggers are fine for slowly varying data, on the order of seconds, for example. This is similar to any mechanical strip chart recorder. The chart speed is autoscaled with the time between samples function. As far as data types are concerned, Spreadsheet files are larger, but can be read by anyone...binary files are more compressed, but may need special decoders. So, depending on who's using your data, you will have to decide on the type of file.
I think you'll be happy with the Simple data logger. you can also modify it to save a log file simultaneously...just wire in a save to spreadsheet node.

chutla

[Dave]

ab using LabVIEW, I can not decide which model to use Simple Data Logger or Cont. Acquisition to Spread Sheet File,the analog voltage is in the range of 10mV and is mixed with noise,I also want to syn the LabVIEW chart speed with the hardware chart speed??Hi, I am trying to do almost exactly the same process and have managed to write a VI that will acquire data from 2 channels quickly enough to record any relevant data to a spreadsheet file. However, I want to be able to insert a software trigger that relies on a change in one of the files and then reads from within the circular buffer, how can I do this? The change/trigger is a dropping in the voltage signal being acquired. I can get my VI to acquire data but can't get it to wait for the trigger parameters to be met.

[reuselfriese]

ab using LabVIEW, I can not decide which model to use Simple Data Logger or Cont. Acquisition to Spread Sheet File,the analog voltage is in the range of 10mV and is mixed with noise,I also want to syn the LabVIEW chart speed with the hardware chart speed??Sorry for the late reply.
"Some input signals that you measure can be very short-lasting by nature.
The mechanical and electrical character of a HW stripchart enbles you to show short but very high/low signal changes.
You could mimic this by filtering the input of your ADC measurements."
This means you will see signals that you do not see by using a mechanical strip chart recorder?
If so which filters do you mean?
I have the problem that my DAQcard NI 6024 gives a very rough signal but I want to see it as smooth as on my recorder.
Any suggestions?