usb 6211

[cadiz1]

Hi  I am following the videos  on the 6211  http://decibel.ni.com/content/docs/DOC-8352

Question 1. (Ref Event count  video)  What is the value of the   pull up resistor  and  where  does it connect to ?

 Question 2.  Please  give detail  about the power transistor used .  It seems the base is   connect directly  to  the  Analog output.  Is  no biasing  required?

A  circuit diagram  would   be extremely  helpful.

Ref (Analog Input Video).   Two  potentiometers  are used. Question1. If the  pot is  turned  fully  the AI  will be grounded and  then current will  sink or source to ground? will  this damage the AI?  IF   you ground a  AI  will it be damaged?

A  circuit diagram  would   be extremely  helpful.

Ref(Triggered Analog Input and logging)

 What   value is  the  resistor  to  keep  the  DI  line  high?

Ref( PID control)  example of power transistor ?

A  circuit diagram  would   be extremely  helpful.

How  can I   stop  switch bounc? (6009 video)

Thanks

cadiz1 

[Owen.S]

Hi cadiz1,

These videos were not created by anyone in the NIUK office. I am currently in the process of contacting the creators of the videos to see if they can provide the information you are after.

Kind regards,

[Owen.S]

Hi again,

I have not recieved a reply as of yet. Maybe someone else on the forums knows more about these videos?

I will get back to you if I get a reply.

Kind regards,

[cadiz1]

 Hi Owen.S,

Thanks  for all  your effort .

I have  discovered   what I think   could be the answer  to   working out  out  pull  up resistors from   the User guide  of the 6009.   I think  the  method  will  be the  same  for the 6211 but the 8.5 mA  bit might be different. 

If this  is  correct   this  will be usefull to a lot of  people.    

In the  same manual    there is a  information  about I/O protection  . I f the   DIO  is an  out put   you should  not connect  to  ground   or  the powersupply .

Sometimes   you ask question and   you discover  them  yourselve.  But please   anyone  am I correct?

NI USB-6008/6009 User Guide and Specifications 22 ni.com

Figure 15. Example of Connecting an External User-Provided Resistor

Complete the following steps to determine the value of the user-provided

pull-up resistor:

1. Place an ammeter in series with the load.

2. Place a variable resistor between the digital output line and the +5 V

supply.

3. Adjust the variable resistor until the ammeter current reads as the

intended current. The intended current must be less than 8.5 mA.

4. Remove the ammeter and variable resistor from your circuit.

5. Measure the resistance of the variable resistor. The measured

resistance is the ideal value of the pull-up resistor.

6. Select a static resistor value for your pull-up resistor that is greater than

or equal to the ideal resistance.

7. Re-connect the load circuit and the pull-up resistor