NI Home
Cart Cart | Help
Hello Events Academic NI Developer Zone Support Solutions Products & Services Contact NI MyNI
You are here: 
 NI Home > NI Developer Zone > NI Discussion Forums

Academic Hardware Products (NI-ELVIS, NI-myDAQ)

turn on suggestions Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Reply
Topic Options
Member luciana
Member
luciana
Posts: 4
0 Kudos

I have a variable +-10V DC signal, and a +-5V ADC range. How can I acquire the signal properly?

Options

‎05-20-2005 10:26 AM

 
Message 1 of 2 (1,966 Views)
 
Reply
Active Participant Henrik_Volkers
Active Participant
Henrik_Volkers
Posts: 1,765
0 Kudos

Re: I have a variable +-10V DC signal, and a +-5V ADC range. How can I acquire the signal properly?

Options

‎05-23-2005 09:31 AM

Luciana,

use a voltage divider. The simples form is build with two resistors. In your case two resistors of the (exactly) same value.
Connection is (Signal)-(Resistor1)-(ADCinput)-(Resistor2)-(SignalGround)
Depending on your DC Signal source and the input resistant of your ADC the value of your resistors should be in a range of from 10k up to 1M.
47k resistors are a good starting point :-)
Since you said it is DC you don't have to care about frequency compensation.
Error calculation will be your homework
Greetings from Germany
Henrik

LV since v3.1

“ground” is a convenient fantasy

'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'
Message 2 of 2 (1,960 Views)
 
Reply
By using this web site, you accept the Terms of Use for this web site. Please read these Terms of Use carefully before using any part of this site. Please go here for information on ni.com's copyright infringement policy.
My Profile | Privacy | Legal | Contact NI © 2011 National Instruments Corporation. All rights reserved.    |    E-Mail this Page E-Mail this Page