Quick question about the oscilloscope app and maybe calibr
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- Posts: 13
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Quick question about the oscilloscope app and maybe calibr
Hi,
Quick question upon measuring a voltage (simple circuit with two 100k resistors in serial and 5v from red pitaya in), with a multimeter i measure aprox 2,34 volts now with with the scope application it shows 2.041v?
Am I missing something here or maybe the red pitaya needs calibration?
Any help, info or tips appreciated.
regards,
Leo
Quick question upon measuring a voltage (simple circuit with two 100k resistors in serial and 5v from red pitaya in), with a multimeter i measure aprox 2,34 volts now with with the scope application it shows 2.041v?
Am I missing something here or maybe the red pitaya needs calibration?
Any help, info or tips appreciated.
regards,
Leo
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- Posts: 13
- Joined: Sun Jul 03, 2016 10:42 am
Re: Quick question about the oscilloscope app and maybe cali
No one any ideas ? ..
regards,
Leo
regards,
Leo
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Re: Quick question about the oscilloscope app and maybe cali
If you measure an unexpected voltage from a known source, you should certainly try to calibrate your Red Pitaya (see here).
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Re: Quick question about the oscilloscope app and maybe cali
Hi Niels,
Well actually its not an unknown voltage its the first example from the elektor book about red pitaya soms know the voltage and als have measured with a multimeter. Just suprised me the pitaya measurement was about 0,35v apart from what the multimeter tells me.
Anyway thanks for your reply and i will give calibration a go.
Regards,
Leo
Well actually its not an unknown voltage its the first example from the elektor book about red pitaya soms know the voltage and als have measured with a multimeter. Just suprised me the pitaya measurement was about 0,35v apart from what the multimeter tells me.
Anyway thanks for your reply and i will give calibration a go.
Regards,
Leo
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- Posts: 13
- Joined: Sun Jul 03, 2016 10:42 am
Re: Quick question about the oscilloscope app and maybe cali
Niels,
So in the attachment picture is what I see if in the oscilloscope application i connect out1 to in1. The generator is set to 1v amplitude but still I see in the scope the amplitude on IN1 is .845v?
Pretty new to electronics and red pitaya, coming from a software background and a recent HAM operator so i might be totally doing the wrong thing or looking at it the wrong way though?
Thanks,
Leo
So in the attachment picture is what I see if in the oscilloscope application i connect out1 to in1. The generator is set to 1v amplitude but still I see in the scope the amplitude on IN1 is .845v?
Pretty new to electronics and red pitaya, coming from a software background and a recent HAM operator so i might be totally doing the wrong thing or looking at it the wrong way though?
Thanks,
Leo
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Re: Quick question about the oscilloscope app and maybe cali
First try to reset the calibration settings to factory defaults - there's a menu item in the scope app for that. When I did that with a totally miscalibrated RP, it brought the measured input from 1.13V to 0.999V for a 1V DC generated output.
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Re: Quick question about the oscilloscope app and maybe cali
Hi Niels,
Just did the factory defaults for the calibration in the scop... now the measured voltage is even lower, 766mV.. Weirdnes all around not sure what else to try but suggestions welcome.
thanks and greetings,
Leo
Just did the factory defaults for the calibration in the scop... now the measured voltage is even lower, 766mV.. Weirdnes all around not sure what else to try but suggestions welcome.
thanks and greetings,
Leo
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Re: Quick question about the oscilloscope app and maybe cali
And what happens when you do the calibration procedure?
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Re: Quick question about the oscilloscope app and maybe cali
Hi Nils,
I have shorted IN1 and IN2 and pressed calibrate. I have IN1 to 1v and IN2 to 20v btw not sure if that makes a difference. Previously it was and still is after calibration still hovering around 827mV.
regards and many thanks for your assistance.
Leo
I have shorted IN1 and IN2 and pressed calibrate. I have IN1 to 1v and IN2 to 20v btw not sure if that makes a difference. Previously it was and still is after calibration still hovering around 827mV.
regards and many thanks for your assistance.
Leo
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- Joined: Sun Jul 03, 2016 10:42 am
Re: Quick question about the oscilloscope app and maybe cali
Just to anwser the solution to my own problem
Did a two step calibration through the oscilloscope app:
1. standard calibration with IN1 and IN2 shorted
2. LV/HV calibration with a known stable input voltage
Problem gone and Red Pitaya now nicely calibrated !
regards,
Leo
Did a two step calibration through the oscilloscope app:
1. standard calibration with IN1 and IN2 shorted
2. LV/HV calibration with a known stable input voltage
Problem gone and Red Pitaya now nicely calibrated !
regards,
Leo
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