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Custom Y-axis range

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Custom Y-axis range

Postby amartino » Thu Aug 04, 2016 11:17 am

Hi,

It is possible to select a range of +-50mV for the channel which would result to around 0.4mV minimal step. (2*50mV/256steps).

Is it possible to set this range with a constant DC component so that I can observe a range [1050 - 1100]mV while still having the minimal step of around 0.4mV?
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Re: Custom Y-axis range

Postby Martyn » Fri Aug 05, 2016 12:55 pm

A number of our scopes have the option to apply a DC offset to the input signal.

Which device do you have ?
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Re: Custom Y-axis range

Postby amartino » Fri Aug 05, 2016 1:34 pm

2205A
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Re: Custom Y-axis range

Postby alan » Sat Aug 06, 2016 5:50 am

If its a constant DC component you want to remove why not AC couple?
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Re: Custom Y-axis range

Postby springburo » Tue Dec 06, 2016 5:07 pm

Most commercial scope add a dc offset to the Yaxis automatically so the full displayed window can be used and measured. Often we measure with the Yaxis 0V at the bottom of the screen, eg voltage over a transistor, with a 0-80V i could use a 0-100V scale/ 10V/div. With the picoscope I then have use a range +/100V and loose resolution. Would it be possible to automatically add the Dc offset in picoscope when the Yaxis is offset so that i could then measure from 0-100V with the full resolution.
Also having the option to snap the Yaxis offset at logical points say 20 would make life much easier
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Re: Custom Y-axis range

Postby Gerry » Thu Dec 08, 2016 12:47 pm

Hi springburo,

You're essentially correct. In our PicoScopes, the Analogue-to-Digital Converter (ADC) performs the conversion single ended to give ADC values from zero up to the maximum value for whatever resolution is being used. PicoScope 6 then effectively applies a DC offset to place 0V at a half-way value, and from that point on provides a double ended (split, positive and negative going) display. This is fundamental to the PicoScope 6 Scope view, so any further adjustments, such as software DC offsets, are made afterwards and won't preserve the resolution. To preserve any resolution an additional DC offset must be applied in hardware (before the ADC), which is only available in a few of our fuller featured hardware PicoScopes (unfortunately this doesn't include the entry level PicoScope 2205A).

Just to clarify, what I believe you're asking is "would it be possible to incorporate the user requested DC offset into the automatic DC offset that splits the display (giving a display that isn't split in the middle), so that any user requested DC offset (up to half of the voltage range) won't reduce the resolution", and "would it be possible to have, say 20, discrete values (grid lines) that the 0V line can be dragged and dropped to, in order to perform a number of quick adjustments". So, I will submit a software enhancement request, for this, and let you know the outcome. Thanks for the suggestion.

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