Vertical Scaling error on 2205 MSO

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KenArton
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Vertical Scaling error on 2205 MSO

Post by KenArton » Thu Mar 21, 2013 12:20 pm

Hello,
I have had a 2250 MSO 'scope for a couple of years. I now find that there seems to be an error on the vertical axis scaling. When I apply, say, a square wave of amplitude 3.3V my scope displays amplitude of 2.75V, ie it reads low by about 17% (83% of actual value). I observe the same error:
On both channels
With probes set at x1 or x10 attenuation.
With a probe from another scope
With AC and DC coupling
As measured by screen grid, or horizontal cursors, or using measurement facility.
With low frequency or high frequency pulse or sine signals, or even just DC.
Have I inadvertently set some kind of scale factor, or some other setting that could cause this?
Or is my scope faulty?
Thanks for any help.

Martyn
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Re: Vertical Scaling error on 2205 MSO

Post by Martyn » Thu Mar 21, 2013 1:11 pm

Can you attach a psdata file showing this. Thanks
Martyn
Technical Support Manager

KenArton
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Re: Vertical Scaling error on 2205 MSO

Post by KenArton » Thu Mar 21, 2013 4:17 pm

20130321-0001.psdata
(23.15 KiB) Downloaded 274 times
Hi Martyn,
psdata file is attached.
This shows a 3.3V p-p square wave on channel A.
Cursor and grid shows ~2.75V p-p
Measurement facility shows 2.9V p-p

Martyn
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Re: Vertical Scaling error on 2205 MSO

Post by Martyn » Fri Mar 22, 2013 9:19 am

Which version of Picoscope software are you using ? Please post the contents of Help->About
Martyn
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KenArton
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Joined: Thu May 10, 2012 4:43 pm

Re: Vertical Scaling error on 2205 MSO

Post by KenArton » Fri Mar 22, 2013 11:25 am

Hi Martyn,

Here is info requested:

PicoScope® 6 - PC Oscilloscope software version: 6.6.57.20
Copyright © 1995-2013, Pico Technology Ltd

Model: PicoScope 2205 MSO
Serial Number: AR602/103
USB Version: 2.0
Calibration Date: 24 January 2012
Hardware Version: 1
Driver Version: 1.0.0.267
Firmware Version: 1.3.3.0 / 0.2.2.0

Martyn
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Re: Vertical Scaling error on 2205 MSO

Post by Martyn » Fri Mar 22, 2013 12:37 pm

It appears that there may be an error in the ps2000a.dll installed with that version. If you take the attached dll and drop it into the installation folder C:\Program Files\Pico Technology\PicoScope6 you should find it works correctly.
Attachments
PS2000a.zip
PS2000a driver file
(800.87 KiB) Downloaded 238 times
Martyn
Technical Support Manager

KenArton
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Posts: 0
Joined: Thu May 10, 2012 4:43 pm

Re: Vertical Scaling error on 2205 MSO

Post by KenArton » Fri Mar 22, 2013 6:12 pm

Hello Martyn,

New dll file has fixed the problem. Many thanks, Ken.

AriZuu
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Joined: Thu Apr 25, 2013 6:08 pm

Re: Vertical Scaling error on 2205 MSO

Post by AriZuu » Thu Apr 25, 2013 6:10 pm

Hi,

Thank you for new dll. I had similar problem with my picoscope also and this fixed it.

Ari S.

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