Power connections, Power connections -31 – National Instruments DAQCard-1200 User Manual
Page 53
Chapter 3
Signal Connections
© National Instruments Corporation
3-31
Power Connections
Pin 49 of the I/O connector supplies +5 V from the DAQCard-1200 power
supply. This pin is referenced to DGND. You can use the +5 V to power
external digital circuitry.
•
Power rating
250 mA at +5 V maximum, fused to 1 A
Warning
Do not directly connect this +5 V power pin to analog or digital ground or to any
other voltage source on the DAQCard-1200 or any other device. Doing so can
damage the DAQCard-1200 or your PC. National Instruments is
NOT
liable for any
damage due to incorrect power connections.
Pin 49 is fused for up to 1 A, but should be limited to 250 mA. The fuse is
a thermally resettable fuse which has an internal thermostat. This
thermostat opens when the current exceeds 1 A and the temperature rises.
After some time, the thermostat cools down, the switch closes, and the +5
V is available once more. Opening this fuse does not necessarily damage
the DAQCard-1200. If you do not receive +5 V, check for any shorts
between the +5 V power pin and ground.