using usb-6221 as a voltage switch

[dark7flame]

I have a low DC voltage signal coming from instrument A using a coax cable, sometimes I need this signal to go to instrument B and sometimes I need it to go to instrument C.  If I split the signal with a splice, the signal never reaches machine C (I assume this is due to lower resistance in instrument B).  This leads me to the conclusion that I need some sort of switch for the signal.  Now I have a USB-6221 laying around, but I have never used it like that.

So is it possible (and/or advisable) to use the USB-6221 as a switch, letting A to B (with minimal signal loss) at specified times and A to C at all other times?  I would also welcome any input into the situation.  Manually moving the cable is helping me get old faster.

[dark7flame]

Tried it out.  No it can't.  The USB-6221 can read the current, but it cannot generate the current.  So I have to find another way to switch the signal.

[AnalogKid2DigitalMan]

You could use one of the digital outputs to turn a single pole, double throw (SPDT) 5 volt DIP relay to switch A (tied to common pole of the relay) to switch it between the B and C connections. You should add a reverse biased diode across the coil of the relay to prevent any voltage spikes from getting back to the digital output sriver circuitry.

-Ak2DM