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PQM-700 Operating Manual

1.6

Measured parameters

PQM-700 analyzer is designed to measure and record the following parameters:



RMS phase and phase-to-phase voltages

– up to 760 V (peak voltages up to ±1150 V),



RMS currents: up to 3000 A (peak currents

– up to ±10 kA) using flexible clamps (F-1(A), F-

2(A), F-3(A)); up to 1000 A (peak values

– up to ±3600 A) using CT clamps (C-4(A) or C-5(A));

up to 10 A (peak values

– up to ±36 A) using C-6(A) clamps, or up to 100 A (peak values – up

to ±360 A) using C-7(A) clamps,



crest factors for current and voltage,



mains frequency within the range of 40...70 Hz,



active, reactive and apparent power and energy, distortion power,



harmonics of voltages and currents (up to 40th),



Total Harmonic Distortion THD

and THD

for current and voltage,



power factor, cosφ, tanφ,



unbalance factors for three-phase mains and symmetrical components,



flicker P

and P



inrush current for up to 60 s.

Some of the parameters are aggregated (averaged) according to the time selected by the user

and may be stored on a memory card. In addition to average value, it is also possible to record
minimum and maximum values during the averaging period, and to record the current value occur-
ring in the time of measurement.

The module for event detection is also expanded. According to EN 50160, typical events include

voltage dip (reduction of RMS voltage to less than 90% of nominal voltage), swell (exceeding 110%
of the nominal value) and interruption (reduction of the supplied voltage below 5% of the nominal
voltage) The user does not have to enter the settings defined in EN 50160, as the software provides
an automatic configuration of the device to obtain energy measurement mode compliant with EN
50160 The user may also perform manual configuration

– the software is fully flexible in this area.

Voltage is only one of many parameters for which the limits of event detection may be defined. For
example, the analyzer may be configured to detect power factor drop below a defined value, THD
exceeding another threshold, and the 9th voltage harmonic exceeding a user-defined percentage
value. Each event is recorded along with the time of occurrence. For events that relate to exceeding
the pre-defined limits for voltage dip, swell, interruption, and exceeding minimum and maximum
current values, the recorded information may also include a waveform for voltage and current. It is
possible to save two periods before the event, and four after the event.

A very wide range of configurations, including a multitude of measured parameters make PQM-

700 analyzer an extremely useful and powerful tool for measuring and analysing all kinds of power
supply systems and interferences occurring in them. Some of the unique features of this device
make it distinguishable from other similar analyzers available in the market.

Tab. 1 presents a summary of parameters measured by PQM-700, depending on the mains

type.