Teledyne LeCroy CPCI-H110 - Manual (Page 4)

4
EXTERNAL POWER SUPPLY
An external terminal J5 is used for the external power supply input. However remember never to connect any supply to
these inputs so long as you have JP4, JP5, JP6 and JP7 installed. In case you want to use the external supply as an input
you must remove these 4 jumpers in order not to cause any conflict with the bus voltages. These jumpers are, however,
independent from each other. For instance if you want to bring in only a +5V from the external supply and continue to
use the bus voltages for +12V, -12V, and +3.3V, you would only need to remove JP5. The list below identifies which
jumper is for which supply:
JP4 = --12V
JP5 = +5V
JP6 = +12V
JP7 = +3.3V
JP7 1 & 2 for 3.3V from on board regulator, JP7 2 & 3 from the bus, not installed from the external supply.
The following diagram indicates the interconnection of the Unit-Under-Test voltages to the bus voltages and the external
voltages:
As you can see, there will be conflict in case the external supply is connected while the jumper is still in place.
If you are using external power supplies do not forget to connect the Ground (GND) signals between the system and the
supply. If your external power supply outputs are not isolated, make sure the ground of the system (containing the
extender board) and the ground of the power supply are at the same voltage phase/level with respect to a common point,
before connecting the GND signal.
If making current measurements on +5V, be sure to remove JP10 if the VIO and +5V on your
board are on the same voltage plane.