question on acquire current input from CB-68LP connector blocks

[John wong]

hello
i has a question.I try to get the current input to the labview using CB-68LP.I had wired to channel 1.The correct reading should be 0.0724A.But I cannot get the correct reading
Thank you

[John wong]

please..i need help

[chilly_charly]

Week end is a difficult time when you need a quick help.
You should not have post a second message to catch somebody attention : some people just scan the forum to search for unanswered questions...and you gave an answer to your own question, changing its status.

First thing to do : use MAX to see if you can read the proper signal.
Second : use the attached vi to see if you can read the signal in LV.

Things should process smoothly after that.

CC

[John wong]

what is MAX?

[chilly_charly]

MAX stands for "Measurement and Automation eXplorer". It's an utility that is installed with LabVIEW. It appears on the desktop as a circular blue icon with the NI white symbol and a yellow arrow over. You should use it to test and configure DAQ cards, serial ports...

CC

[John wong]

hi
I used the variable resistor connected to the 1.5v battery (dc ) wired to channel 1 of the blocks..I was able to got the right voltage reading in the Lab view program (lab 2 vi).But when I used from DC to AC supply (230V),I would not got the right reading.The reading is negative..anybody know why?

[AlanArmstead]

John,
What voltage (or current) are you supposed to be reading? Depending on your data acquisition board, the input limits are probably -10V to 10V. You can not get accurate readings if you excede the voltage limits of the board. Extremely high voltages (like 230V) will damage the board also. Additionally, are you trying to read an AC signal?
-Alan A.