I have a very simple circuit that I want to operate a solenoid valve. I have an NI USB 6008 with 12 digital I/O ports, a KF0602D solid state relay, a 12V power supply and a solenoid valve.
The idea behind this circuit is fairly simple: use a digital line from the 6008 to close or open the switch in the KF0602D. With the switch closed, current flows from the power supply through the switch, to the valve and the valve opens. When the switch opens no current flows and the valve closes.
When I hook up my 6008 to the KF0602D, however, my digital output "high" drops from 5V to 1.73V. This is a problem because my switch requires at least 3V to close. I am not sure why the voltage is dropping so significantly because the relay is supposed to only need about 3mA of current with a 5V input, well within the range of the 6008's listed specs. What can I do to make this work?