Fluke 434 User Manual download pdf (Page 48)

Fluke 433/434

Users Manual

11-2

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The table displays power data for each phase and in total: real or active power (kW),

apparent power (kVA, the product of rms voltage and current), reactive power (kVAR,

the reactive component of apparent power caused by phase shift between AC current and

voltage in inductors and capacitors), power factor (PF, the ratio of real power to apparent

power for the total rms including harmonics), displacement power factor (DPF or cos ϕ,

the ratio of real power to apparent power for fundamental), and the 12 or 10 cycle rms

values of current and voltage.

Symbols indicate if a load is capacitive (

) or inductive ( ).

A popup table with energy usage by phase and in total can be activated on the Fluke 434

by pressing the F3 – ENERGY softkey. The table shows real energy (kWh), apparent

energy (kVAh), and reactive energy (kVARh) The energy measurement starts when

Power & Energy is started. The readout can be reset with function key F5.

By a using TIMED start of the measurement, the Fluke 434 can be used to measure

energy usage during a predefined period of time. TIMED start can be adjusted when

switching from HOLD to RUN with function key F5. Temporarily Close ENERGY to

make function key F5 available for HOLD/RUN operation.

Pulse count mode counts pulses like those available at the pulse output of certain types of

energy meters. This can be used to as a quick test for revenue meter error. The pulse

output is measured by means of an Optical Isolated Trigger Probe that is connected

between the pulse output and the Analyzer’s optical RS-232 interface. Figure 11-1 shows

the measuring setup. The energy usage (kWh) per pulse must be set in advance. The

adjustment menu is reached via the SETUP key and function key F3 – FUNCTION

PREF. See Chapter 18, FUNCTION PREFerences.

Figure 11-1. Verification of an energy meter with pulse output

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Fluke 434 User Manual Page 48