Rear Panel Connections
Signal Description
Sleep Mode Current
OW-503-4 has 4 channels, each with a soware enabled 10Ω shunt for detecting current when the DUT is in power-down or “sleep”
mode. Each shunt has a positive and negative end, and both ends are available on the rear panel and can be connected to a fully
isolated Voltmeter. The signal is dierential: ±channel pairs carry the analog voltage from the shunt. Positive current will be
measured on the + and - pin when current flows from IN to channel OUT. Both channel pins will be common mode at the channel
output voltage, ie 12V relative to front panel COM.
Because this board passes power out the back, any adc or volt-meter used to sense the shunt voltage must be galvanically
isolated. Using non-isolated modules could result in damage to the module or the SLSC chassis.
Operating Mode Current
All 4 channels convert operating currents into -10 to +10V voltages at the rear panel, referenced to a common laboratory ground
(G). These voltages can be sensed by a real time National Instruments analog to digital module. Each channel has a 55A current
sense range, where the full scale ±10V signal corresponds to 55A. Positive outputs at the rear panel correspond to current flowing
from IN to channel OUT on the front panel.
Operating current out pins (I
O
and G) are galvanically isolated from all front panel pins. Rear panel signals share a common ground
(G). Pins G* on the signal midplane are normally not connected to anything, but can be ground if the PXI jumpers on the card are
connected. Jumper settings depend on the mapping of the cabling and adapter used to connect to the real time adc module.
Typically, jumpers should be connected in PXI applications, and disconnected in Compact-RIO applications.
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