## Picoscope 4227 and Voltage position

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daniele bartalesi

### Picoscope 4227 and Voltage position

Good morning.
It is possible to set the voltage position of the channel?
I haven't found any function to do this. Can you help me?

Chris
Posts: 169
Joined: Tue Aug 17, 2010 9:00 am
Location: St. Neots

### Re: Picoscope 4227 and Voltage position

Do you mean the voltage range?

have a look in the programmers guide at the ps4000SetChannel function

This is where you specify the voltage range you are using.

http://www.picotech.com/document/pdf/ps4000pg-en-5.pdf

Then to get the mv value back from the adc value returned from the scope, use the equation.....

mV = (ACD count x mV range) / max value (note: max value = 32764)

so on the +/- 5V range, an adc count of 12950 would give a 1976 mv value
(12950 x 5000) / 32764

daniele bartalesi

### Re: Picoscope 4227 and Voltage position

Do you mean the voltage range?

No i speak to the voltage offset of the channel

In our software (picoscope 6) it's possible to configure offset by the advanced options for the channel a/b

Chris
Posts: 169
Joined: Tue Aug 17, 2010 9:00 am
Location: St. Neots

### Re: Picoscope 4227 and Voltage position

So you will just need to add whatever offset voltage you want onto the mV value you calculate from the returned adc count, and the channel range.

daniele bartalesi

### Re: Picoscope 4227 and Voltage position

Yes,
I want insert into a channel of the picoscope a signal (for example: 3Vpp sinusoidal) and add at this signal a offset value, (for example: -3Vp).
The signal result is the main signal shifted of the offset value. (in the example the signal result oscillates from 0 to -6volts)
thank you
Daniele

Chris
Posts: 169
Joined: Tue Aug 17, 2010 9:00 am
Location: St. Neots

### Re: Picoscope 4227 and Voltage position

There is no API function to do this. You will just need write your code to add the offset, or calculate a percentage offset for the ADC count values you get back from the scope.

daniele bartalesi

### Re: Picoscope 4227 and Voltage position

ok but can you explain me how realized the offset function?

ziko
Posts: 1705
Joined: Fri Dec 01, 2006 10:03 am
Location: St Neots

### Re: Picoscope 4227 and Voltage position

Hi Daniele,

You would have to write this yourself, you can either add an offset to the ADC counts or do it as a percentage of the ADC counts.

Kind regards
Ziko

Technical Specialist