Using Power From The Pio-122 - Keithley PIO-12 User Manual

Using Power from the P10-12
Power from the computer supply is available on the main I/O connector of
the P10-12. In situations where the P10-12 is used with a dedicated
peripheral (for example, a switch pad) and the cabling and design loads
are fixed, you may find it more appropriate to use the P10-12 power
outputs. In most other cases, however, you are advised to power external
devices from their own supplies.
In general, you are advised not to use computer power unless you can
safely avoid the following conditions:
• S h o r t circuits, overloads, or the application of other external voltages.
• A power draw that exceeds the capacity of the computer power
2-6 I n
All of these conditions may damage the PC system board and result in
costly repairs. The PC power supply is designed to shutdown on a
short circuit, but you should not rely on this characteristic to protect
your system.
supply and its internal loads (see the technical reference manual for
your computer). Because of computer board connector and trace
width limitations, we recommend that you limit power draw to 1 A
from the +5 V and +12 V supplies (if available). The -12 V and -5 V
supplies are limited to much lower loads.
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