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Odd noise

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Odd noise

Postby foxabilo » Mon Dec 17, 2007 6:40 pm

Hmmm, This is all going to sound very strange unless someone else has this already. I have just taken delivery of 20 of the 2202 scopes for data logging and development work, now they all work grea, better than great in fact, BUT.... (there is always a but on a forum post) if I turn them to Spectrum mode, i.e in picoscope I select spectrum view they ALL (all the ones in spectrum view) make a noise! now how to describe this noise? hmmm, Ok, well in words the noise would be Bleek and a dash of Ziiink and the noises come exactly in time with the PC screen updates, I know its the 2202's as we have all had our ear to them and they are the culprits, its not very loud, a bit like when you mobile is in your jeans under your coat and at the bottom of the laundry basket on Saturday morning and that alarm you forgot to turn off starst going?, you know really really quiet but annoying, anyway, with 20 of the bleeders the noise it can get quite loud.. I dont mind stuffing them all in sound proof box's but is this meant to happen? I know a few cameras make a whine as they charge the flash, but I have not heard solid state electronics make a noise before. Ho hum they work great anyway, so cool product but any help on the wheeep wheep :) would be appreciated.

Fox out
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Postby ziko » Tue Dec 18, 2007 8:44 am

Hi an interesting one! Could you let me know what your exact settings where by sending a settings file and what kind of signal you are trying to measure.

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Postby foxabilo » Tue Dec 18, 2007 10:10 am

Hi,

Yep it’s a odd one alright, OK I was not exactly performing a scientific test (ohh the shame) I was "testing" the probes by putting one on my finger and one on my other finger and watching the 50Hz mains hum (OHH come on, WE ALL DO IT :)) and then I turned on channel B to Auto range and clicked Add new spectrum, then they start the zwink zwink noise.

I am doing my technical credibility no favours here :)
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Postby foxabilo » Tue Dec 18, 2007 10:15 am

Opps forgot the settings file,
Attachments
PS2202 SETTINGS.rar
(457 Bytes) Downloaded 242 times
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Postby ziko » Tue Dec 18, 2007 11:34 am

Aha I see what its doing now! This is the relay switching between two voltage ranges. In the file you sent you have the scope set at one voltage range and in the spectrum mode you have the same channel set on another voltage range. The relay is in one position up to 1V and in another position from 2 V upwards. If you have the scope mode in say 2V or above and you have the spectrum mode in 1V or below it will switch between both modes.

The software is flexible enough to do this. So if you want to get rid of the noise either close one of the views or make sure both views are in the same voltage range.

Hope this helps.

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Postby foxabilo » Tue Dec 18, 2007 11:57 am

Brillaint! problem solved thanks
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