Please see the following older thread from here:
https://www.electronicspoint.com/threads/noob-trying-to-use-a-ssr-with-low-voltage.248043/
I had that system up and working well, but we've changed to a new acquisition system. In place of the meter, there is a national instruments NI 9205 cDAQ module.
If I meter the terminals with a voltmeter, I get 0/4.5v as expected.
The DAQ card shows a floating low voltage (from zero to 4.2v) and a high of 4.5. If I also connect the meter in parallel, I get correct readings on both.
I assume the DAQ board doesn't have enough load to allow the output of the SSR to work correctly.
Is there any way I can simulate this load? Would a resistor somewhere help? Reduce the value of the in-line resistor?
Thanks in advance.
https://www.electronicspoint.com/threads/noob-trying-to-use-a-ssr-with-low-voltage.248043/
I had that system up and working well, but we've changed to a new acquisition system. In place of the meter, there is a national instruments NI 9205 cDAQ module.
If I meter the terminals with a voltmeter, I get 0/4.5v as expected.
The DAQ card shows a floating low voltage (from zero to 4.2v) and a high of 4.5. If I also connect the meter in parallel, I get correct readings on both.
I assume the DAQ board doesn't have enough load to allow the output of the SSR to work correctly.
Is there any way I can simulate this load? Would a resistor somewhere help? Reduce the value of the in-line resistor?
Thanks in advance.