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Fluke 434/435
Users Manual
11-2
e
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The Meter screen 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 12/10
or 180/150 cycle rms values of current and voltage.
F1 allows switching between voltage readout per phase (A/L1,B/L2,C/L3,N) or phase-to-
phase (AB,BC,CA) for 3-phase Y configuration.
Symbols indicate if a load is capacitive (
) or inductive ( ).
A popup Meter screen with energy usage by phase and in total can be activated on the
Fluke 434/435 by pressing the F3 – ENERGY softkey. The Meter screen 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 434/435 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 (Watt Hour) meters. The energy meter screen presents the percentage of deviation
between total kWh and number of energy meter pulses. 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 (number of
pulses per kWh) must be set in advance. The adjustment menu is reached via the SETUP
key and function key F3 – FUNCTION PREF. See Chapter 20, FUNCTION
PREFerences.
Instead of using the Trigger Probe, you can make a manual measurement. For this you
must watch the rotation of the wheel of the energy meter and press F4- MANUAL
COUNT +1 each time the pointer on the wheel passes by. The Analyzer counts pulses
either from the Trigger Probe or from F4. It is assumed that one source is used at a time.