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Low output voltage AWG Picoscope 6400

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Low output voltage AWG Picoscope 6400

Postby hmaarrfk » Sat Nov 02, 2013 11:30 pm

Hello,

I have a Picoscope 6403D and I'm trying to use the AWG. Unfortunately, the output seems to be +- 0.04V instead of +- 0.5V.

Also, the output appears wavy if you zoom into it.

Any clue as to what might be happening?

I've attached the output as seen from AWG attached to channel A.

Picoscope 6403D AWG low voltage output.png


Thank you,

Mark
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Re: Low output voltage AWG Picoscope 6400

Postby Martyn » Sun Nov 03, 2013 7:15 pm

Can you post a psdata file File->SaveWaveform, we can then run this on a device here.

Are you connecting with a standard BNC to BNC cable between the generator and channel A?
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Re: Low output voltage AWG Picoscope 6400

Postby hmaarrfk » Sat Nov 16, 2013 1:07 am

Hi Martyn,

Thank you for your reply.
I forgot to check the forums for a while.

The connection is indeed a BNC to BNC connection.

It seems hard to reproduce the problem. It comes and goes.

I did find a temporary fix though.

If you change the amplitude of the signal, to 2V, (changing it from the default of 1V to 1.1V or 0.9V or even 1.5V doesn't fix the problem), the output is well behaved again. Once the output is well behaved, I can bring it back down to whatever I want.

I used what I think is the minimum number of clicks to obtain the figure attached.

The problem also occurs if you try to use the programming interface provided through the dll.

Let me know if you need any additional information.

Mark
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Re: Low output voltage AWG Picoscope 6400

Postby Martyn » Fri Nov 22, 2013 8:59 am

Which version of Picoscope software are you using, Help->About and post the text, and if possible post a psdata file when the problem occurs and we can take a look at the settings.
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Re: Low output voltage AWG Picoscope 6400

Postby hmaarrfk » Thu Dec 26, 2013 8:57 pm

Hi Martyn,


In the screenshot I had earlier, the version of the software appeared.

I've tried it again with a newer version of the software, mainly:

PicoScope® 6 - PC Oscilloscope software version: 6.7.40.3
Copyright © 1995-2013, Pico Technology Ltd

Model: PicoScope 6403
Serial Number: AP225/021
USB Version: 2.0
Calibration Date: Tuesday, March 22, 2011
Hardware Version: 1 1
Driver Version: 1.2.1.121
Firmware Version: 1.1.5.0 / 1.1.25.0

And initially, the waveform looks like what the file 0001 has.

After taking the time to write this post, maybe 2-5 minutes to ensure I had everything in order. The signal generator went through a phases of instability (the waveform's amplitude was really acting up) until it started to output the desired waveform, shown in the file 0002.

The files are too big to upload here, so I've uploaded them to dropbox.com

https://www.dropbox.com/sh/tuzgbkioy77y ... 0SigGenBug

I hope this helps.

Mark
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Re: Low output voltage AWG Picoscope 6400

Postby hmaarrfk » Mon Feb 10, 2014 12:54 am

Hi Martyn,

Has there been any update on this bug?

Thanks,

Mark
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Re: Low output voltage AWG Picoscope 6400

Postby Martyn » Mon Feb 10, 2014 9:59 am

Can you verify this with the Release Candidate of the software from http://www.picotech.com/software.html. Changes have been made to the AWG section of the driver, although we haven't been able to replicate your fault to verify the fix.
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