Setting up Attenuators

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Setting up Attenuators

Postby Tristan » Thu Nov 15, 2012 9:47 pm

Choosing 20:1 attenuator option on my channel automatically sets my range from -100 to 400v.but what if my voltage is reading more than 400v. how can i set up my scope to capture up to 1000vs/1kv with an attenuator. Or do i just choose +/- 1kv range with attenuator installed?
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Re: Setting up Attenuators

Postby AuthorMike » Fri Nov 16, 2012 11:56 am

In this case you can choose the x20 probe setting (rather than the 20:1 attenuator), this will provide you with a wider range of inputs.

x20 Probe.jpg


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Re: Setting up Attenuators

Postby FioranoCars » Thu Dec 20, 2012 7:10 pm

Sorry to ask a daft question ... but can you use 2 or more attenuators in Series?
ie use two 20:1 to achieve 400:1 attenuation?

thanks
Richard
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Re: Setting up Attenuators

Postby Alan » Fri Dec 21, 2012 6:38 am

Hi Richard,

BNC connectors and possibly the cables are not rated >400V so please do not cascade the attenuators as you risk damage to the scope and possibly yourself!

Direct measurement of high voltages requires differential isolating probes - we go up to 7000V with our TA042 but they are not cheap
http://accessories.picotech.com/active- ... html#TA042

Regards
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Re: Setting up Attenuators

Postby FioranoCars » Fri Dec 21, 2012 11:41 am

Thanks, thought there might be a major issue with that!

I did think the attenuators were safe for ignition wiring etc, using clamp style HT leads, which will surely be in excess of 400v ?

thanks
Richard
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Re: Setting up Attenuators

Postby Avdr » Fri Dec 21, 2012 5:56 pm

FioranoCars wrote:Thanks, thought there might be a major issue with that!

I did think the attenuators were safe for ignition wiring etc, using clamp style HT leads, which will surely be in excess of 400v ?

thanks
Richard


The HT clamp on leads, convert the impluse they see into a suitable input voltage to the scope. You can see from the scope setup file in pico that probe is scaled y=10000x + c. Which in esscense means whatever the HT clamp inputs to the scope is multiplied by 10 000, so 1v input, is displayed as 10 kV.
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