Sep-10-2018 08:11 PM
Sep-11-2018 10:49 AM
RoyB wrote:That's a great way to get a really bad reading. Good DC voltmeters have a very high input resistance. If you use two in series, you'll need to add the measured voltages to even get close. Try it.
Back in the day when we had multiple DC Meters to use we always put all of the DC Meters in series...
Sep-11-2018 10:42 AM
ScottG wrote:RoyB wrote:
I have never paralleled those meter shunts before like you are showing in your diagram. Don't be surprised if you get half the DC Current reading you are expecting...
Back in the day when we had multiple DC Meters to use we always put all of the DC Meters in series...
I would write down what it doing with only one meter set hooked up and see if it works OK for you paralleling in the second meter movement...
Only the DC lines between the Shunt and frame GROUND needs to be heavy duty wiring. Wires to and from the meter movement can be small wiring size..
Just saying from experience it may not work for you but give it a try anyway... If it doesn't work as expected you will want to leave the single shunt in place but wire the two DC meters in series coming off the single shunt.
Roy Ken
Modern meters have such tremendously high impedance that you could hook a dozen of them up to a shunt without noticing any V drop.
Not like our old Simpsons!
Sep-11-2018 08:09 AM
RoyB wrote:
I have never paralleled those meter shunts before like you are showing in your diagram. Don't be surprised if you get half the DC Current reading you are expecting...
Back in the day when we had multiple DC Meters to use we always put all of the DC Meters in series...
I would write down what it doing with only one meter set hooked up and see if it works OK for you paralleling in the second meter movement...
Only the DC lines between the Shunt and frame GROUND needs to be heavy duty wiring. Wires to and from the meter movement can be small wiring size..
Just saying from experience it may not work for you but give it a try anyway... If it doesn't work as expected you will want to leave the single shunt in place but wire the two DC meters in series coming off the single shunt.
Roy Ken
Sep-11-2018 06:59 AM
Sep-11-2018 06:43 AM
wa8yxm wrote:
...Common telephone wire will do.
Sep-11-2018 06:43 AM
Sep-11-2018 06:37 AM
RoyB wrote:
I have never paralleled those meter shunts before like you are showing in your diagram. Don't be surprised if you get half the DC Current reading you are expecting...
Sep-11-2018 06:36 AM
Sep-11-2018 05:18 AM
Sep-10-2018 08:36 PM
Sep-10-2018 08:26 PM
Sep-10-2018 08:21 PM