I have an issue with an NI-9485. I am trying to us it to turn on a High Voltage AC relay. I have the +24V need to run the HV relay to CH0a. CH0b is connected to the positive of the HV relay's coil. The negative of the HV relay' coil is connected to ground. When I turn on the +24 Volts, no matter what the state NI-9485 I get 10mA of current that turns on the HV relay.
If I remove the connection to the NI-9485 and hook up on ohm meter to it, the relay works fine. If I replace the NI-9485 with a NI-9481 the current only flow when the NI-9481 is commanded closed. NI-9485 was picked because of the channel count.
Does anyone know why the NI-9485 does not like to switch +24V?