input needed. VHO testing... - Page 4

DJ88 · #1 03-03-2002, 12:05 AM

Titus,

With shipping and the cable it comes to the $33 price.

took a closer look again.. won't work.. crap..

[ 03 March 2002, 00:25: Message edited by: DJ88 ]

StirCrazy · #2 03-03-2002, 03:07 AM

ok I am confused :D
you had said you needed to be able to measure 1mv incraments up to 5V (at least that how I understod it [img]smile.gif[/img] ) but when Titus worked out the resolution it worked out to 78.125mV.

no basing my assumptions on the deff of resolution being
"Resolution is the smallest difference in measurement that can be read from the instrument."
that means you would have 6 steps from 0V to 5V so you could measure 0V, 78.125mV, 156.25mV, 234.375mV, 312.5mV, 390.625mV and 468.75mV and you would not be able to accuratly measure any valu in between. now if there is something I am missing please tell me as this is confusing me :D

Steve

titus · #3 03-03-2002, 11:19 PM

Hello,

The spec for the card Darren posted says its resolution is 8-bit, meaning it has 256 different levels.

StirCrazy · #4 03-03-2002, 11:27 PM

so is that 0.78mV steps then?
just to conferm my thinking.. 1 volt = 100mV.. right?

Steve

titus · #5 03-03-2002, 11:29 PM

Hello,

No. 1V = 1000mV.
So 10Vpp of input divided into 8-bit (256) of resolution gives you a number I originally posted. Too lazy to pull our my calculator.

StirCrazy · #6 03-04-2002, 01:20 AM

ok ya that makes sence.. don't know what I was messing it up with to get that but oh well..

Steve