USB 6009 Increase DIO voltage

[fuqface]

Hi,

I have a USB 6009. I'm trying to trigger a pump by outputting 5 volts over a GND and DIO channel. I only seem to be getting 1.9V (measured by voltmeter)

Is it possible to increase the voltage output on a DIO on a USB 6009 in Max? Is there a hardware work around?

Thanks.

[Karissap]

What are your current draw requirements? You may need to add some external pull-up circuitry as the output line specification for a high level is between 2.0 to 5.8. Have you tried using the analog output channel set at 5V instead?

[andymatter]

QUOTE (fuqface @ May 13 2009, 06:46 PM)

Hi,

I have a USB 6009. I'm trying to trigger a pump by outputting 5 volts over a GND and DIO channel. I only seem to be getting 1.9V (measured by voltmeter)

Is it possible to increase the voltage output on a DIO on a USB 6009 in Max? Is there a hardware work around?

Assuming the DO channel is working properly (5V when open-circuit) and not configured as open-collector (I don't know if the 6009 can do that), it sounds like the pump-trigger circuit is drawing more current than the DO can source. Check the specs for both. When talking about using DO lines to drive various loads, it's not a question of increasing the voltage of the logic circuit itself in order to get more juice to your load (logic supplies aren't generally meant to be adjustable), but of putting the proper drive circuit in between to keep both source and load operating currents within their intended specs, so that you're less likely to cause damage or unexpected behavior in either of them. Can you describe for us the pump-trigger circuit you're trying to drive? (i.e. relay coil, transistor, optoisolator, trained chimp holding two wires, etc.)

QUOTE (Karissap @ May 13 2009, 09:56 PM)

Have you tried using the analog output channel set at 5V instead?

Assuming it's a current sourcing problem, I don't think I would try that. The specs for the 6009 say that the max current capability is 5mA for an AO channel and 8.5mA for a DO channel, so you probably need more than 8.5mA, assuming you haven't already reduced your available current below 8.5mA by using up your total DIO current-drive allotment of 102mA in your other DIO channels.

[RalcoBe]

Hi,

I have a USB 6009. I'm trying to trigger a pump by outputting 5 volts over a GND and DIO channel. I only seem to be getting 1.9V (measured by voltmeter)

Is it possible to increase the voltage output on a DIO on a USB 6009 in Max? Is there a hardware work around?

Thanks.

This device gives max 5 Volt. When it doesn't, it's broken, or you need more current.

The hardware workaround is a power transistor. Many configurations and models exist, depending on what you want. It's very cheap.

When you're in a college, ask the specialised professor, when not, look at specialised sites. Too hard to explain in 5 words here.

http://www.google.be/search?q=transistor+amplifier