Fluke 434 - Manual (Page 49)

Power & Energy
Trend
11
11-3
To access the Energy popup table:
f F3
Available function keys:
F2 Pulse count mode on/off.
F3 Switch Energy screen on/off.
F4 Access Trend screen. For description see below.
F5 Switch between HOLD and RUN of screen update.
Switching from HOLD to RUN invokes a menu to select
immediate (NOW) or TIMED start time which allows you
to define start and duration of the measurement.
If Energy is displayed, the readout can be reset with F5.
Trend
To access the Power & Energy Trend screen:
g F4
The figures in the table are instantaneous values that update constantly. Changes in these
values over time are recorded whenever the measurement is active. All values in the table
are recorded, but the Trends from each row in the table are displayed one at a time. Press
function key F1 to assign the arrow keys to row selection.
The traces build up from the right side. The readings in the header correspond to the most
recent measurements plotted on the right.
In addition to TIMED start of energy usage measurement, the Analyzer can measure
average power during an adjustable time window. Electricity suppliers often bill
industrial customers upon the highest average energy usage during a specified time
window. For this demand interval a period of 15 minutes is common.
For any setting besides OFF horizontal scaling of the trend is fixed so that each data point
corresponds with Max, Min, and Average usage during the interval. The demand interval
can be adjusted between 1 ... 60 minutes or to OFF. The adjustment menu is reached via
the SETUP key and function key F3 – FUNCTION PREF. See Chapter 18, FUNCTION