Where can i find the on/off voltage range of the digital input signal on the ION7650?

[mimi1002]

hi all,

Where can i find the on/off voltage range of the digital input signal on the ION7650?

 

Can you tell me the information about the range of on/off state for ion7650 as above?

thanks a lot.

Best regarlds

[Charles_Murison]

Hello @mimi1002,

The screenshot you provided is likely from ION9000, PM800 or ION7400 meter. The ION7650 meters uses a completely different design. There are no ranges, there is open or there is close.

https://www.se.com/ww/en/download/document/70002-0247/, page 11. The digital inputs require Open/Close signal with or without external DC voltage.

Regards,

Charles

[DanL · Accepted solution]

The ION7650 digital inputs have internal "self-excitation" and will register as "Closed" when an Sn (n=1 to 8 ) digital input is connected to Scom with a voltage between 0V (short) and 130VDC.

• A wire with less than 10k Ohms (ideally less than 1 Ohm) across the terminals will register as CLOSED.
• A connection with a (non-negative) voltage up to 130VDC applied (ideally less than 30VDC) will register as CLOSED.
• A negative voltage exceeding -20V is applied (recommended practice is to provide an open circuit instead of a negative voltage) will register as OPEN.
• A connection with more than 1Meg Ohms (ideally more than 10 Meg Ohm) across the terminals will register as OPEN.