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2-6
Power Budget
Power Budgeting
3 Write in the board computer’s concurrent requirements in the line provid-
ed for VME slots 1 and 2 in the Lower Power Supply Worksheet (Table
2-7).
4 Determine each device’s current requirements from the Internal Device
Requirements table and the VME accessory card’s specifications sheet
(Table 2-5).
5 Write in each device’s current requirements in the spaces provided in the
Upper or Lower Power Supply current budgeting worksheets (Table 2-6
and Table 2-7).
6 Total each column in both worksheets, then write the total in the Total
Current Required line.
7 If either worksheet has a column whose current totals exceed the maxi-
mum available for that column’s voltage, you must reduce the number of
devices to lower the total current being drawn at that voltage. You may be
able to relocate VME accessory cards between the upper eight and lower
two slots to reduce the power required from either power supply.