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jduffus
Guest
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 Posted: Wed Dec 17, 2003 10:20 pm Post subject: ADC-40 Aymmetrical display |
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Hi,
I just started using Picoscope, with Win 98 to parallel port. Using latest software.
Displaying the output of an ac power supply which reads 13.5 V rms (i.e.approx 19V pk) on a meter I get a display (with a 10x probe) of +20V peak to -45V peak. Exactly the same display with connections reversed.
With an AAA cell I get 1.87V with normal connection, and -26.77V reversed.
Also with a half cycle of the 60Hz there seems only to be about 8 samples. It jumps from the zero-crossing to about half amplitude in a straight line although there seem to be more points around the peak.
(I checked the parallel port after reading a previous post and it is set at Normal, 378H and IRQ 7)
Thanks,
John Duffus |
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ricardo
Moderator
Joined: 07 May 2003
Posts: 98
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| Posted: Thu Dec 18, 2003 11:37 am Post subject: |
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Hi John,
I can't replicate the problems you describe, I've tried both 5.09.4 and BETA. Could you email me some .psd files showing the problem, so I can have a look at your settings?
Best Regards,
Ric |
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ricardo
Moderator
Joined: 07 May 2003
Posts: 98
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| Posted: Fri Dec 19, 2003 2:44 pm Post subject: |
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Hi John,
Thanks for the .psd files. Well, I think either the ADC or the parallel port on the PC is faulty.
If you could try the ADC-40 on a different PC and confirm that the problem still exists then you've almost definitely got a faulty ADC. If thats the case contact our returns department for an RMA number so that we can test it in the lab.
Best Regards,
Ric |
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