Page 8 - Voltech Instruments PM3000A Universal Power Analyser, designed and produced by Connell Marketing Associates, UK

Wiring, Channel and Efficiency

The PM3000A is highly versatile and can be configured to analyze almost any electrical
system. This versatility is achieved because all the power inputs are ac + dc coupled,
and are isolated from each other and from ground.

The inputs can therefore be connected as required by the user, and front panel push-
buttons will program the instrument for the system being measured.

1Ø2W 1Ø 2W
1Ø3W
3Ø3W SINGLE PHASE, TWO WIRE. Select for single phase loads, two wire
3Ø4W distribution systems and rectifier outputs.

1Ø 3W

SINGLE PHASE, THREE WIRE. Select for three wire single phase
distribution systems.

3Ø 3W

THREE PHASE, THREE WIRE. Select for three phase loads without
neutral connection (Two wattmeter method).

3Ø 4W

THREE PHASE, FOUR WIRE. Select for three phase loads with or
without neutral connection (Three wattmeter method).

NOTE: It is possible to set up independent wiring configurations through use of the
F and P keys. For example CH1 and CH2 can be linked to measure one load (like
3Ø3w) and CH3 can simultaneously measure a separate load (like 1Ø2w). Alternatively,
all three channels may be set totally independent of each other (like 3 separate power
analyzers).

The channel select pushbuttons allow the PM3000A to display the measured value
in any phase or the total for all phases, or where appropriate for the neutral current.

EFFICIENCY

The independent wiring modes of the PM3000A provide the capability to display
efficiency readings based on simultaneous power measurements of the independent
channels.

A user-definable efficiency formula allows Watts and VA to be configured for all
combinations of channels.

For example CH1/CH2 or (CH1+CH2)/CH3.

CH1 CH2 CH3 CH1 CH2 CH3

Displays the measurement value for the
selected phase.

Σ Displays the summation (total) value for the multiphase system.

This provides analysis of neutral currents in multiphase systems.
N

Neutral current waveforms are computed by the summation of the
instantaneous values of the individual phase currents.
Arms, Amean, Apk and Acf can be displayed. The distortion factor of the
neutral current can be measured and harmonic analysis of this current
can be performed.

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