Power & Energy; Introduction - Fluke 434-II User Manual

Chapter 11
Power & Energy

Introduction

Power & Energy displays a Meter screen showing all important power parameters. The
related Trend screen shows the changes over time of all measuring values in the Meter
screen. An Events table lists all crssings of threshold voltages.
The Analyzer also displays energy usage. Power calculations are done for Fundamental
and Full. FUNDamental considers voltage and current only at the fundamental frequency
(60, 50 Hz, or 400 Hz in Fluke 437-II) for power calculations; FULL uses the full
frequency spectrum (True rms voltage and current).
Press in sequence: the SETUP key, F4 – MANUAL SETUP, F3 – FUNCTION PREF and
the up/down arrow keys to select Power measurement parameters Method and Display
and if required adjust them with the left/right arrow keys. Also the Cycle Aggregation
Interval can be set to 10/12 or 150/180 cycles. This interval is of use for rms based
measurements. Refer to chapter 24 for detailed information.
Power measurement can be done according to the methods Unified and Classic. Selection
between both methods is done in the FUNCTION PREF menu.
Unified uses algoritms according to the unified method in accordance to IEEE 1149 as
developed at the Polytechnical University of Valencia. The method allows to measure
real power (kW), apparent power (kVA), reactive power (kvar), harmonic power
components ( kVA Harm), and unbalance power (kVA Unb).
The default setting for the Fluke 430 series II instruments is to use the Unified method to
measure power. For compatibility reason with guidelines that may exist within
companies, there is also a 'classic' method available that utilizes the arithmetic method
for system power as described in IEEE 1459. The method can be changed via the
Function Preference menu. To indicate that classic system with the arithmetic sum
method is used to calculate system power a ∑ (sigma) symbol is used behind the power
parameters e.g. VA .
∑
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