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Unformatted text preview: gests that a good
rule of thumb is that equipment uses about half the maximum power when it is on, though this can
vary significantly with operating mode and type of equipment. Hand-held Ammeter Readings
Handheld ammeters, readily available and familiar to electricians, provided more accurate but still
limitedi measurements of actual current and did not require equipment shut down. For analyses using
this method, we assume voltage to the equipment is constant at the required level indicated by the
equipment power label. Using Equation 4.1 and Equation 4.2, we can then calculate instantaneous
A drawback to this method, beyond the inability to measure the power factor p, is that it is
impractical to continuously monitor current using a handheld meter. Whenever using this method,
we attempted to sample power draw for each piece of equipment in several operational modes, though
this was not always practical given production scheduling.
Watts Up Pro Wattmeter
The Watts Up Pro meter accurately measures the instantaneous real power usage for any equipment
that can be plugged into single phase 120V circuits (i.e. the ubiquitous three-pron...
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This document was uploaded on 03/03/2014 for the course ADMIN 1 at Universidad Nacional de Colombia.
- Spring '14