I am trying to use the digital output of a USB6008 to switch a SSR (AQZ205D), and it failed to do so. I checked the relay, it works fine. I can switch the relay from the 2.5v or 5v of USB6008. How come the digital output cannot do so? Do I miss something here? Thanks much for your thoughts/commens.

In this screenshot from the user manual, LED can be replaced by the pins 2 and 1 of the AQZ205. How have you connected the AQZ205 to the USB-6008 ? What is the value of the resistor ? You must select it to have about 5 mA.

Digital I/O

USB6008 cannot switch SSR.

Solved!

Author

I put a 110R resistor between onboard 5v and digital output channel.

It took some time to figure out the ideal resistor value, but it works now. Thanks much.

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Digital I/O

USB6008 cannot switch SSR.

Re: USB6008 cannot switch SSR.