APPENDIX A
Choosing Test Equipment
Lab Power Supplies (Adjustable)
When purchasing a power supply we have to pay attention to whether it is a switching type or linear version. Switching power (switch mode) supplies are lighter than linear ones by a factor of at least two to one. For example, a 0- to 30-volt 10-amp switching supply weighs less than 4 pounds whereas a linear 0- to 30-volt 5-amp supply weighs about 12 pounds. See Figure A-1.
FIGURE A-1 On left side, a 10-amp switching supply such as the QW QW-MS3010D; and on the right side a ...
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