DSO-2A20E maximum input voltage vs. ADC range setting

DSO-2A20E maximum input voltage vs. ADC range setting

Postby lvdev » Tue Jun 20, 2017 1:48 am

Hi,
Is it possible to damage the DSO-2A20E device by giving it too high a voltage when it is set on the higher sensitivities (say, applying a +-50V sine wave when the input ADC range is set to +- 10mV)? The max. allowable input voltage is specified as +-100V in the manual, but it doesn't specifically mention the effect of the ADC range setting...
Thank you!
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Re: DSO-2A20E maximum input voltage vs. ADC range setting

Postby VirtinsTech » Tue Jun 20, 2017 9:00 am

The max. allowable input voltage with a X 1 probe is +/-100V regardless of the voltage measurement range setting: +/-10mV, +/-20mV, +/-50mV, ..........+/-10V, +/-20V, or +/-50V.

Like many other oscilloscopes in the market, the input of the probe and the input of the VT DSO are NOT galvanically isolated from the computer connected. For many computers (typically desktop PCs or laptop PCs with a built-in AC power supply adapter), the ground lead of the probe is connected to mains earth. This is not a problem if the circuit under test is floating (i.e. isolated from earth). Otherwise, you MUST make sure that the ground lead of the probe is connected to a point on the circuit that is also at earth potential.

For the ground loop issue and its possible impacts on the measurements and USB DSO, see video: https://www.youtube.com/watch?v=0Vo2u11V3fU
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Re: DSO-2A20E maximum input voltage vs. ADC range setting

Postby lvdev » Thu Jun 22, 2017 4:48 am

Thank you very much!
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