The base has a common ground, so no you cannot do that as proposed.

On Mon, Jul 15, 2019 at 10:50 AM Adam Moffett <[email protected]> wrote:

> Volt meter inputs are isolated.  I don't recall if the base unit has one
> or if you have to buy the volt meter module.
> -Adam
>
> On 7/15/2019 1:47 PM, Jason McKemie wrote:
>
> I suspected something like this, it would just be nice to be able to
> monitor both power sources.
>
> On Mon, Jul 15, 2019 at 12:46 PM Adam Moffett <[email protected]> wrote:
>
>> I don't think any Packetflux stuff does -48v because they have negative
>> tied to ground on the circuit board.  I think you'll get sparks if you do
>> that.
>>
>> I think it would be a bad idea with any device.  You'd have to be sure
>> that the inputs are strongly isolated from each other.  Don't cross the
>> streams Dr. Vankman.
>>
>>
>> On 7/15/2019 1:27 PM, Jason McKemie wrote:
>>
>> Is it okay to have -48v and +24v going into the same site monitor?
>>
>>
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