Search found 16 matches

by ulek
Tue Aug 13, 2013 5:48 am
Forum: LabVIEW
Topic: Probe attenuation setting
Replies: 3
Views: 3225

Re: Probe attenuation setting

Hey, That is what I am doing right now. When I use the 10x probes and account for that (after digital to analog conversion multiply by 10) in the program everything is fine. When I use the 100x probes and do the same thing as for the 10x probes (multiply 100 instead of 10) the signal is extremely no...
by ulek
Mon Aug 12, 2013 3:00 pm
Forum: LabVIEW
Topic: Probe attenuation setting
Replies: 3
Views: 3225

Probe attenuation setting

Hey all,

How would I go about setting custom attenuation for the probes on the picoscope in labview?

When I use 100 probes then the signal in the labview is absolutely ugly.

Thanks
Ulek
by ulek
Fri Jul 26, 2013 8:55 am
Forum: LabVIEW
Topic: Trigger hold off
Replies: 3
Views: 2790

Re: Trigger hold off

Hey, Attached, This is pulsed operation since it exaggerates the problem, On the picoscope software I can get it to be stable but not in labview whatever trigger type or levels I use. Also the trigger levels should be as low as possible since this wave form will be changing(the amplitude and possibl...
by ulek
Thu Jul 25, 2013 10:58 am
Forum: LabVIEW
Topic: Trigger hold off
Replies: 3
Views: 2790

Trigger hold off

Hey,

Does the picoscope have something called trigger holdoff and how would I go about doing it in Labview.

Without the trigger holdoff the signal that I measure has a lot of jitter and is hard to get any measurements out of it.
by ulek
Wed Jun 26, 2013 2:20 pm
Forum: LabVIEW
Topic: Amplitude Problems
Replies: 18
Views: 17523

Re: Amplitude Problems

Ok. This is probably the most stupid thing that was overlooked but, the probes are x10.
Thus my votage reading of 5V will be read as 500mV thus it will not saturate at 500mV.

Simple x10 after the buffer will fix it.
by ulek
Wed Jun 26, 2013 11:37 am
Forum: LabVIEW
Topic: Amplitude Problems
Replies: 18
Views: 17523

Re: Amplitude Problems

I don't think that is an issue of the defeault values as the channel setting overrides it and does't change anything when I change the defaults at the channel settings. Maybe pictures will calrify more what is happening better First I check whether my FG is set correctly using the original software....
by ulek
Wed Jun 26, 2013 10:13 am
Forum: LabVIEW
Topic: Amplitude Problems
Replies: 18
Views: 17523

Re: Amplitude Problems

From what I see when the vi is working everything is fine and there are no breaks.
When I change the range at the the main front panel the settings also change in the subvi.
by ulek
Wed Jun 26, 2013 9:11 am
Forum: LabVIEW
Topic: Amplitude Problems
Replies: 18
Views: 17523

Re: Amplitude Problems

maths to convert ADC counts to mV. ] Well if the conversion range for the mulitplication should be in mV then I had it wrong. But it doesn't really matter after I converted it to the mV its still doesn't solve any of my problems, neither the amplitude issue nor the saturation at level issues. I mad...
by ulek
Wed Jun 26, 2013 8:13 am
Forum: LabVIEW
Topic: Amplitude Problems
Replies: 18
Views: 17523

Re: Amplitude Problems

To be honest I have no idea how to get to that code so I am not sure. I programmed everyting in LabView.

This part I copied straight from the SDK labview example and modified it so it perfromed the way I wanted.

I attached a picture of the values visible in properties
by ulek
Wed Jun 26, 2013 6:39 am
Forum: LabVIEW
Topic: Amplitude Problems
Replies: 18
Views: 17523

Re: Amplitude Problems

Attached is my vi.
It isn't even close to being done so there might be a lot of mess. I planning on cleaning it when I get most of the bugs done.

Also the setup is very similar if not identical to the labview examples from the SDK.
by ulek
Tue Jun 25, 2013 3:19 pm
Forum: LabVIEW
Topic: Amplitude Problems
Replies: 18
Views: 17523

Re: Amplitude Problems

I understand what is happening and it make a lot of sense, but I still see two problems: 1. It sitll doesn't explain why my amplitude is halved in LabView. 2. Even though my signal is 5V then theoretically it should saturate all the way untill the range is 5V, while in my case it stops to sarturate ...
by ulek
Tue Jun 25, 2013 12:39 pm
Forum: LabVIEW
Topic: Amplitude Problems
Replies: 18
Views: 17523

Re: Amplitude Problems

This would suggest that you have the wrong range set in Labview. What range are you using ? and what range in PicoScope ? There can only be one conversion formula, based on maximum ADC count and range. Regarding both things. As I was checking on the Picoscope software I was using auto and then adde...
by ulek
Tue Jun 25, 2013 10:39 am
Forum: LabVIEW
Topic: Amplitude Problems
Replies: 18
Views: 17523

Re: Amplitude Problems

I've tried: - osci set to 50Ohm and FG to 50ohm - osci set 1MOhm and FG to 50ohm - osci set to 1MOhm and FG to High Z - osci set to 50Ohm and FG to High Z When the scope is set to 50Ohm the wave form is very bad (since the probe is 10MOhm). I checked the accuracy of the FG using the picoscope softwa...
by ulek
Tue Jun 25, 2013 7:10 am
Forum: LabVIEW
Topic: Amplitude Problems
Replies: 18
Views: 17523

Amplitude Problems

Hey all, So I got my self a 6404 and I am trying to do some stuff with it using LabView as a interface. I got the data from the oscilloscope no problem using the block subvi and it looks good, all but on regard. The voltage that is shown by the labview graph is half the voltage that I am using in my...
by ulek
Wed May 29, 2013 12:53 pm
Forum: PicoScope 6 for Windows
Topic: On and Off Delay times
Replies: 3
Views: 2123

Re: On and Off Delay times

I had a chance to quickly play with the PicoScope 5203 and see what it can do. I´ve seen that you can measure those things and they are indeed useful to me but for what I want but I would also need to measure the on delay and/or off delay (so measure the time from one channel crosses a given thresho...