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In this way, by combining the [Cost] and [More...] keys, there are 4 cost measurements available.
The rate used by ATPOL II to estimate cost can be displayed or changed by the user at any time. It is
one of the setup functions that can be accessed through the [Setup] key.
Cost Measurements in PSM
Our Report Generator software will calculate the elapsed cost and estimated cost per month of energy
consumed during any one or two intervals of time set by the user. If two time intervals are chosen, it
will report the percent change and the actual change in cost between the two intervals. For instance, if
a comparison report is chosen and $0.50 of energy is consumed during the first interval of 10 minutes
and $0.80 of energy is consumed during the second interval of 20 minutes, then the report would show:
Before After Units Change
%
Change
Cost $0.50 $0.80 $0.30 60.0%
Cost, Estimated per
month
$2,190 $1,752
-
$438.00 -20.0%
In this example, even though the elapsed cost increased significantly, the actual rate of cost declined
significantly because of the difference in time intervals between the before and after tests.
You may view or change the rate used by Report Generator to calculate cost. It is one of the fields you
can change when you set up a report.
Demand Period Measurements
Utilities typically evaluate energy usage over fixed increments of time, such as 15-minute intervals.
These time
intervals are called “demand periods.” The average power consumed during each demand
period is called the “demand” of that period. Typically, the utility will look for the demand period with the
greatest demand over a period of time, such as a month, and
call this the “peak demand period”. The
demand of that period is the “peak demand”. The utility may then present a surcharge on the user’s bill
based on the peak demand. For this reason, power users have an incentive to determine

Peak demand

Peak demand period.
Demand Period Measurements in ATPOL II
During monitoring of energy consumption, the peak demand period is constantly updated. The logging
interval is used as the demand period, so if the logging period is set to 15 minutes, the demand periods
will also be 15-minute periods. Thus if a meter whose logging interval is set for 15 minutes starts
monitoring at 7:00 A.M, it will update the demand period at 7:15, 7:30, 7:45, 8:00, and so on. If the
most power was consumed between 7:45 and 8:00, then the demand period will be displayed as 7:45.
Note that even if the power peaked briefly at 7:29, the demand period would still be reported as 7:45
since more energy was consumed over that 15-minute period.
To see what the demand was during the peak demand period, press [Demand] (to see the time and
date of the peak demand period) and then [More...]. (to see the amount of energy consumed during that
period).