Basicdescriptionandoperationofmeasuringtransducer
6 User’sManual
2.2 Glossary
Term Explanation
RMS Root Mean Square value
MODBUS Industrial protocol for data transmission
MiQen Software for Iskra MIS instruments
AC Alternating voltage
PA total Angle calculated from total active and apparent power
PA1, PA2, PA3 Angle between fundamental phase voltage and phase current
PF Power factor
THD Total harmonic distortion
MD Measurement of average values in time interval
Hand-over place Connection spot of consumer installation in public network
M
v
− Sample factor
Defines a number of periods for measuring calculation on the
basis of measured frequency
M
p
− Average interval
Defines frequency of refreshing displayed measurements on
the basis of a Sample factor
Hysteresis expressed as percentage
[%]
Percentage specifies increase or decrease of a measurement
from a certain limit after exceeding it.
PO Pulse output module
AL Alarm output module
AO Analog output module
FAO Fast analog output module
DO Digital output module
2.3 Description of the product
Measuring transducer is intended for measuring, analyzing and monitoring single-phase or three-
phase electrical power network. It measures RMS value by means of fast sampling of voltage
and current signals, which makes instrument suitable for acquisition of transient events. A built-
in microcontroller calculates measurements (voltage, current, frequency, energy, power, power
factor, THD phase angles, etc.) from the measured signals.
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