Relay for TTL outputs

[justingro]

Hi Guys.

I have bought some of these relays and would like to test them to see if they are OK for my masso but do not know how to test them .

Many thanks

Justin

 

[cncnutz]

Hi Justin,

1. Connect your 24 volt power supply to the relay input.
   
2. Using a multimeter measure the voltage between -ve and the CH1 It should read 0v. Change the link position if you get a voltage reading but I think H is the correct setting for this.
   
3. Once you are getting no voltage between -ve and CH1 connect a 3 volt signal between -ve and CH1 and the relay should operate. You can use 2 AA batteries in series and you should hear the relay operate when you connect the 3 volts. Make sure the -ve of your batteries go to -ve of the relay board and the +ve of the battery goes to CH1
   
4. If this all checks out you should be good to go.
   

Cheers Peter

 

[justingro]

Thanks Peter

Cheers justin