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PLSED309039EN PM1000 Series Power Meters

08/2010 Appendix C – Glossary

Appendix C: Glossary

Terms

Auto (sliding block): An interval selected from five to 30 minutes. The

power meter calculates and updates the demand every 15 seconds.

Baud rate: Specifies how fast data is transmitted across a network port.

Communications link: A chain of devices connected by a communications

cable to a communications port.

Current Transformer (CT): Current transformers for current inputs.

Demand: Average value of a quantity, such as power, over a specified

interval of time.

Firmware: Operating system within the power meter.

Float: A 32-bit floating point value returned by a register (See ―Data

Address‖ on page 53 for more information).

Forward: Importing the power into the plant/grid.

Frequency: Number of cycles in one second.

Line-to-line voltages: Measurement of the RMS line-to-line voltages of the

circuit.

Line-to-neutral voltages: Measurement of the RMS line-to-neutral voltages

of the circuit.

LOCK: Default display page lock (See ―Default display (View) page‖ on page

12 for more information).

Long: A 32-bit value returned by a register (See ―Data Address‖ on page 53

for more information).

Maximum demand: Highest average load during a specific time interval.

Nominal: Typical or average

Parity: Refers to binary numbers sent over the communications link. An extra

bit is added so that the number of ones in the binary number is either even or

odd, depending on your configuration. Used to detect errors in the

transmission of data.

Power factor: True power factor is the ratio of real power to apparent power

using the complete harmonic content of real and apparent power.

Reverse: Exporting the power from the plant/grid.

RMS: Root mean square. The power meters are true RMS sensing devices.

Run mode: This is the normal operating mode of the power meter, where

the readings are taken.

Total Harmonic Distortion (THD): Indicates the degree to which the

voltage or current signal is distorted in a circuit.

ULOC: Default display page unlock (See ―Default display (View) page‖ on

page 12 for more information).

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Schneider Electric K series Bedienungsanleitung Seite 75