NI USB-6215

[theboybatis]

Hello,

I'm using a NI-USB 6215 card to power the circuit in the picture (although the same issue occurs with the 6008 card). I'm trying to set the analogue out value to 5 V and more however the Voltage readout won't exceed ca. 3.2 V. The card is fine when not being used to generate a voltage for the current readings. The manual states that this card should be able to handle 50mA and I'm only drawing 6mA. I gather I can use an external 5 V supply which may help but was surprised that this problem was occurring.

Does anyone have any thoughts about this issue?

Regards

Stephen 

[RavensFan]

Attach the manual that says this card can output 50 mA.

When I searched for the specs, I found this http://www.ni.com/documentation/en/multifunction-io-device/latest/specs-usb-6215/specs/

It says overdrive current 2.4 mA.

DAQ cards aren't meant to power circuits.

[Frozen]

Your circuit would work better if you used a Digital Output for the LED control and sink the current (not source it).

[aputman]

The +5Vdc terminal on the device will output 50mA but the analog output channels will only drive 2mA.  These devices are not meant to power circuits.