This should be an easy circuits question...I think

[thepd7]

When I try to connect this output: output

to this input: input
(from this spec: http://digital.ni.com/manuals....C77837862574960055A66A

The unbalanced grounded configuration gives accurate readings, however balanced grounded gives ~40-60 mV error (on a 500 mV signal).

I am pretty certain I am creating a voltage divider, just not sure why this isn't happening on both configurations.

Note that I am taking pin 2 (+) on the output to + of the BNC input, pin 3 (-) to the shield (-) of the input.

On the input side excitation is off, using DC coupling.

Can anyone give me a good explanation? I'm driving myself nuts over this

 

[JohnCU]

i could give you an explanation, but seeing as how we are enemies i will with-hold this information.

 

[thepd7]

Originally posted by: JohnCU
i could give you an explanation, but seeing as how we are enemies i will with-hold this information.

haha I'll buy you a beer!

 

[JohnCU]

actually to be honest, i have no idea, even as a EE

 

[JohnCU]

but i may be too tired to realize the problem

 

[GodlessAstronomer]

If you weren't an enormous piece of shit in my L&R thread I'd give you a hand. But you were.

 

[JohnCU]

Originally posted by: GodlessAstronomer
If you weren't an enormous piece of shit in my L&R thread I'd give you a hand. But you were.

let me buy you a :beer: sir

 

[thepd7]

Originally posted by: GodlessAstronomer
If you weren't an enormous piece of shit in my L&R thread I'd give you a hand. But you were.

lol weren't you like an English Lit major?

 

[thepd7]

deleted because it was rude

 

[GodlessAstronomer]

Originally posted by: thepd7

Originally posted by: GodlessAstronomer
If you weren't an enormous piece of shit in my L&R thread I'd give you a hand. But you were.

lol weren't you like an English Lit major?

Physics & computer science. I've done more than my share of circuits work.

 

[thepd7]

Originally posted by: GodlessAstronomer

Originally posted by: thepd7

Originally posted by: GodlessAstronomer
If you weren't an enormous piece of shit in my L&R thread I'd give you a hand. But you were.

lol weren't you like an English Lit major?

Physics & computer science. I've done more than my share of circuits work.

nice! why do you get so down on yourself then, that's two solid majors

 

[JohnCU]

if i was coherent, i could figure it out but as such im not since im on vacation so, label me the drunkard and wisk me away

 

[thepd7]

Originally posted by: JohnCU
if i was coherent, i could figure it out but as such im not since im on vacation so, label me the drunkard and wisk me away

where do you fall on this line?

 

[JohnCU]

Originally posted by: thepd7

Originally posted by: JohnCU
if i was coherent, i could figure it out but as such im not since im on vacation so, label me the drunkard and wisk me away

where do you fall on this line?

i started drinking at 2pm and just finished #23, i probably am at the resonant frequency

 

[thepd7]

I looked at this again today and am still stuck. Any suggestions?