METREL MI 2792 PowerQ4 Plus User manual

PowerQ4 Plus
MI 2792
Instruction manual
Version 1.0, Code No. 20 751 782

2
Distributor:
Manufacturer:
METREL d.d.
Ljubljanska cesta 77
1354 Horjul
Slovenia
web site: http://www.metrel.si
e-mail: [email protected]
Mark on your equipment certifies that this equipment meets the requirements of the EU
(European Union) concerning safety and interference causing equipment regulations
© 2010 METREL
No part of this publication may be reproduced or utilized in any form or by any means
without permission in writing from METREL.

MI 2792 PowerQ4 Plus Table of contents
3
1Introduction.............................................................................................................6
1.1 Main Features ...................................................................................................6
1.2 Safety considerations ........................................................................................7
1.3 Applicable standards .........................................................................................8
1.4 Abbreviations.....................................................................................................8
2Description............................................................................................................12
2.1 Front panel ......................................................................................................12
2.2 Connector panel ..............................................................................................13
2.3 Bottom view.....................................................................................................14
2.4 Accessories .....................................................................................................14
2.4.1 Standard accessories...............................................................................14
2.4.2 Optional accessories ................................................................................15
3Operating the instrument.....................................................................................16
3.1 Instrument Main Menu.....................................................................................17
3.1.1 Instrument main functions ........................................................................18
3.2 U, I, f menu......................................................................................................19
3.2.1 Meter ........................................................................................................19
3.2.2 Scope .......................................................................................................20
3.2.3 Trend........................................................................................................22
3.3 Power menu ....................................................................................................25
3.3.1 Meter ........................................................................................................25
3.3.2 Trend........................................................................................................26
3.4 Energy menu ...................................................................................................28
3.5 Harmonics menu .............................................................................................29
3.5.1 Meter ........................................................................................................29
3.5.2 Histogram (Bar)........................................................................................31
3.5.3 Trend........................................................................................................32
3.6 Flickermeter.....................................................................................................35
3.6.1 Meter ........................................................................................................35
3.6.2 Trend........................................................................................................36
3.7 Phase Diagram................................................................................................37
3.7.1 Phase diagram .........................................................................................37
3.7.2 Symmetry diagram ...................................................................................38
3.7.3 Symmetry trend........................................................................................39
3.8 Temperature....................................................................................................41
3.8.1 Meter ........................................................................................................41
3.8.2 Trend........................................................................................................41
3.9 General Recorder............................................................................................42
3.10 Waveform recorder..........................................................................................45
3.10.1 Setup........................................................................................................45
3.10.2 Capturing waveform .................................................................................47
3.10.3 Captured waveform..................................................................................48
3.11 Inrush / Fast recorder ......................................................................................51
3.11.1 Setup........................................................................................................52
3.11.2 Capturing inrush.......................................................................................53
3.11.3 Captured inrush........................................................................................54
3.12 Transients recorder .........................................................................................56
3.12.1 Setup........................................................................................................56
3.12.2 Capturing transients .................................................................................57
3.12.3 Captured transients ..................................................................................58

MI 2792 PowerQ4 Plus Table of contents
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3.13 Events table.....................................................................................................61
3.14 Alarms table ....................................................................................................65
3.15 Memory List.....................................................................................................66
3.15.1 Record......................................................................................................68
3.15.2 Waveform snapshoot ...............................................................................70
3.15.3 Waveform record......................................................................................71
3.15.4 Inrush/Fast logger ....................................................................................71
3.15.5 Transients record .....................................................................................71
3.16 Measurement Setup menu ..............................................................................71
3.16.1 Connection setup .....................................................................................72
3.16.2 Event setup ..............................................................................................74
3.16.3 Alarm setup ..............................................................................................74
3.16.4 Signalling setup........................................................................................76
3.17 General Setup menu .......................................................................................76
3.17.1 Communication ........................................................................................77
3.17.2 Time & Date .............................................................................................79
3.17.3 Language .................................................................................................79
3.17.4 Clear Memory...........................................................................................80
3.17.5 Instrument info .........................................................................................81
3.17.6 Lock/Unlock..............................................................................................81
4Recording Practice and Instrument Connection ...............................................83
4.1 Measurement campaign..................................................................................83
4.2 Connection setup ............................................................................................87
4.2.1 Connection to the LV Power Systems ......................................................87
4.2.2 Connection to the MV or HV Power System.............................................90
4.2.3 Current clamp selection and transformation ratio setting .........................91
4.2.4 Temperature probe connection ................................................................95
4.2.5 GPS time synchronization device connection ..........................................96
4.2.6 GPRS modem connection........................................................................97
4.3 Number of measured parameters and connection type relationship ...............98
5Theory and internal operation ...........................................................................101
5.1 Measurement methods..................................................................................101
5.1.1 Measurement aggregation over time intervals .......................................101
5.1.2 Voltage measurement (magnitude of supply voltage) ............................101
5.1.3 Current measurement (magnitude of supply current).............................102
5.1.4 Frequency measurement .......................................................................102
5.1.5 Phase power measurements..................................................................103
5.1.6 Total power measurements....................................................................103
5.1.7 Energy....................................................................................................104
5.1.8 Harmonics and interharmonics...............................................................105
5.1.9 Signallling...............................................................................................106
5.1.10 Flicker.....................................................................................................107
5.1.11 Voltage and current unbalance ..............................................................108
5.1.12 Voltage events .......................................................................................109
5.1.13 Alarms ....................................................................................................111
5.1.14 Data aggregation in GENERAL RECORDING .......................................112
5.1.15 Waveform snapshoot .............................................................................116
5.1.16 Waveform record....................................................................................116
5.1.17 Transient recorder..................................................................................117
5.1.18 Inrush/Fast recorder ...............................................................................117

MI 2792 PowerQ4 Plus Table of contents
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5.2 EN 50160 Standard Overview .......................................................................119
5.2.1 Power frequency ....................................................................................119
5.2.2 Supply voltage variations .......................................................................120
5.2.3 Voltage dips (Indicative values)..............................................................120
5.2.4 Short interruptions of the supply voltage ................................................120
5.2.5 Long interruptions of the supply voltage.................................................120
5.2.6 Supply voltage unbalance ......................................................................120
5.2.7 THD voltage and harmonics...................................................................120
5.2.8 Interharmonic voltage.............................................................................121
5.2.9 Mains signalling on the supply voltage ...................................................121
5.2.10 Flicker severity .......................................................................................121
5.2.11 PowerQ4 Plus recorder setting for EN 50160 survey.............................121
6Technical specifications ....................................................................................123
6.1 General specifications ...................................................................................123
6.2 Measurements...............................................................................................123
6.2.1 General description ................................................................................123
6.2.2 Phase Voltages ......................................................................................124
6.2.3 Line voltages ..........................................................................................125
6.2.4 Current ...................................................................................................125
6.2.5 Frequency ..............................................................................................126
6.2.6 Flickermeter ...........................................................................................126
6.2.7 Power .....................................................................................................126
6.2.8 Power factor (Pf) ....................................................................................127
6.2.9 Displacement factor (Cos φ)...................................................................127
6.2.10 Energy....................................................................................................127
6.2.11 Voltage harmonics and THD ..................................................................128
6.2.12 Current harmonics and THD ..................................................................128
6.2.13 Voltage interharmonics...........................................................................128
6.2.14 Current interharmonics...........................................................................128
6.2.15 Signalling................................................................................................129
6.2.16 Unbalance ..............................................................................................129
6.2.17 Time and duration uncertainty................................................................129
6.2.18 Temperature...........................................................................................129
6.3 Recorders......................................................................................................130
6.3.1 General recorder ....................................................................................130
6.3.2 Waveform recorder.................................................................................130
6.3.3 Inrush/fast recorder ................................................................................130
6.3.4 Waveform snapshoot .............................................................................131
6.3.5 Transients recorder ................................................................................131
6.4 Standards compliance...................................................................................131
6.4.1 Compliance to the IEC 61557-12 ...........................................................131
6.4.2 Compliance to the to the IEC 61000-4-30 ..............................................133
7Maintenance........................................................................................................134
7.1 Inserting batteries into the instrument ...........................................................134
7.2 Batteries ........................................................................................................135
7.3 Power supply considerations.........................................................................136
7.4 Cleaning ........................................................................................................136
7.5 Periodic calibration ........................................................................................136
7.6 Service ..........................................................................................................136
7.7 Troubleshooting.............................................................................................136

MI 2792 PowerQ4 Plus Introduction
6
1 Introduction
PowerQ4 Plus is handheld multifunction instrument for power quality analysis and
energy efficiency measurements.
Figure 1.1: Instrument PowerQ4 Plus
1.1 Main Features
4 voltage channels with wide measurement range: 0 ÷ 1000 Vrms, CAT III / 1000
V.
4 current channels with support for automatic clamp recognition and “on
instrument” range selection1.
Compliance with power quality standard IEC 61000-4-30 Class S/A. Predefined
recorder profile for EN 50160 survey.
Power measurements compliance with IEC 61557-12 and IEEE 1448.
Simultaneous 8 channels - 16bit AD conversion for accurate power
measurements (minimal phase shift error).
Simple to use and powerful recorder with 8 MB of memory and possibility to
record 524 different power quality signatures.
Interharmonics and mains signalling measuring and recording.
1only with Metrel »Smart clamps«

MI 2792 PowerQ4 Plus Introduction
7
Digital thermometer for temperature measurement.
Powerful troubleshooting tools: transient, inrush/fast, and waveform recorder.
Voltage events and user defined alarms capture.
15 hour of autonomous (battery) supply.
PowerView v2.0 is a companion PC Software which provides easiest way to
download, view and analyze measured data or print.
oPowerView v2.0 analyzer exposes a simple but powerful interface for
downloading instrument data and getting quick, intuitive and descriptive
analysis. Interface has been organized to allow quick selection of data
using a Windows Explorer-like tree view.
oUser can easily download recorded data, and organize it into multiple sites
with many sub-sites or locations.
oGenerate charts, tables and graphs for your power quality data analyzing,
and create professional printed reports.
oExport or copy /.paste data to other applications (e.g. spreadsheet) for
further analysis.
oMultiple data records can be displayed and analyzed simultaneously.
Merge different logging data into one measurement, synchronize data
recorded with different instruments with time offsets, split logging data into
multiple measurements, or extract data of interest.
1.2 Safety considerations
To ensure operator safety while using the PowerQ4 Plus instrument and to minimize the
risk of damage to the instrument, please note the following general warnings:
The instrument has been designed to ensure maximum operator safety. Usage in
a way other than specified in this manual may increase the risk of harm to the
operator!
Do not use the instrument and/or any accessories if there is any damage visible!
The instrument contains no user serviceable parts. Only an authorized dealer
can carry out service or adjustment!
All normal safety precautions have to be taken in order to avoid risk of electric
shock when working on electrical installations!
Only use approved accessories which are available from your distributor!
Instrument contains rechargeable NiMh batteries. The batteries should only be
replaced with the same type as defined on the battery placement label or in this
manual. Do not use standard batteries while power supply adapter/charger is
connected, otherwise they may explode!
Hazardous voltages exist inside the instrument. Disconnect all test leads,
remove the power supply cable and switch off the instrument before removing
battery compartment cover.
In hot (> 40 °C) environment the battery holder screw might reach maximum

MI 2792 PowerQ4 Plus Introduction
8
allowed temperature for metal part of handle. In such environment it is advisable
not to touch the battery cover during or immediately after the charging.
Maximum voltage between any phase and neutral input is 1000 VRMS. Maximum
voltage between phases is 1730 VRMS.
Always short unused voltage inputs (L1, L2, L3, GND) with neutral (N) input to
prevent measurement errors and false event triggering due to noise coupling.
1.3 Applicable standards
The PowerQ4 Plus is designed and tested in accordance with the following standards:
Electromagnetic compatibility(EMC)
EN 61326-2-2: 2006
Electrical equipment for measurement, control and
laboratory use.
Emission: Class A equipment (for industrial
purposes)
Immunity for equipment intended for use in
industrial locations
Safety (LVD)
EN 61010-1: 2001 Safety requirements for electrical equipment for
measurement, control and laboratory use
Measurements methods
IEC 61000-4-30: 2008 Class S Testing and measurement techniques – Power
quality measurement methods
IEC 61557-12: 2007 Equipment for testing, measuring or monitoring of
protective measures – Part 12: Performance
measuring and monitoring devices (PMD)
IEC 61000-4-7: 2002 + A1:
2008 Class II
General guide on harmonics and interharmonics
measurements and instrumentation
IEC 61000-4-15 : 2010 Flickermeter – Functional and design specifications
EN 50160 : 2010 Voltage characteristics of electricity supplied by
public distribution networks
Note about EN and IEC standards:
Text of this manual contains references to European standards. All standards of EN
6XXXX (e.g. EN 61010) series are equivalent to IEC standards with the same number
(e.g. IEC 61010) and differ only in amended parts required by European harmonization
procedure.
1.4 Abbreviations
In this document following symbols and abbreviations are used:
CfI Current crest factor, including CfIp (phase p current crest factor) and CfIN
(neutral current crest factor). See 5.1.3 for definition.
CfU Voltage crest factor, including CfUpg (phase p to phase g voltage crest
factor) and CfUp (phase p to neutral voltage crest factor). See 5.1.2 for
definition.

MI 2792 PowerQ4 Plus Introduction
9
Cos  ,
DPF
Displacement factor including Cosp/ DPFp(phase p displacement
factor). See 5.1.5 and 5.1.6 for definition.
eP+ , eP- Active energy including ePp (phase p energy) and ePtot (total energy).
Minus sign indicates generated energy and plus sign, indicate consumed
energy. See 5.1.7 for definition.
eQi+,eQc+,
eQi-, eQc-
Reactive energy including eQp (phase p energy) and eQtot (total energy).
Minus sign indicates generated energy and plus sign, indicate consumed
energy. Inductive reactive energy character is marked with “i” and
capacitive reactive energy character is marked with “c”. See 5.1.7 for
definition.
eS+,eS-Apparent energy. Minus sign indicates generated energy and plus sign,
indicate consumed energy. See 5.1.7 for definition.
f, freq Frequency, including freqU12 (voltage frequency on U12), freqU1 (voltage
frequency on U1and freqI1 (current frequency on I1). See 5.1.4 for
definition.
i-Negative sequence current ratio (%). See 5.1.11 for definition.
i0Zero sequence current ratio (%). See 5.1.11 for definition.
I+Positive sequence current component on three phase systems. See
5.1.11 for definition.
I-Negative sequence current component on three phase systems. See
5.1.11 for definition.
I0Zero sequence current components on three phase systems. See 5.1.11
for definition.
I½Rms RMS current measured over each half period , including Ip½Rms (phase p
current), IN½Rms (neutral RMS current)
IFnd Fundamental RMS current Ih1(on 1st harmonics), including IpFnd (phase p
fundamental RMS current) and INFnd (neutral RMS fundamental current).
See 5.1.8 for definition
Ihn nth current RMS harmonic component including Iphn(phase p; nth RMS
current harmonic component) and INhn(neutral nth RMS current harmonic
component). See 5.1.8 for definition
Iihn nth current RMS interharmonic component including Ipihn(phase p; nth
RMS current interharmonic component) and INhn(neutral nth RMS current
interharmonic component). See 5.1.8 for definition
INom Nominal current. Current of clamp-on current sensor for 1 Vrms at output
IPk Peak current, including IpPk (phase p current) including INPk (neutral peak
current)
IRms RMS current, including IpRms (phase p current), INRms (neutral RMS current).
See 5.1.3 for definition.
 P, P+,P-Active power including Pp (phase p active power) and Ptot (total active
power). Minus sign indicates generated power and plus / no sign, indicate
consumed power. See 5.1.5 and 5.1.6 for definition.

MI 2792 PowerQ4 Plus Introduction
10
p, pg Indices. Annotation for parameter on phase p: [1, 2, 3] or phase-to-phase
pg: [12, 23, 31]
PF, PFi+,
PFc+, PFi-,
PFc-
Power factor including PFp (phase p power factor vector) and PFtot (total
power factor vector). Minus sign indicates generated power and plus sign,
indicate consumed power. Inductive power factor character is marked with
“i” and capacitive power factor character is marked with “c”.
Note: PF = Cos when upper harmonics are not present. See 5.1.5 and
5.1.6 for definition.
Plt Long term flicker (2 hours) including Pltpg (phase p to phase g long term
voltage flicker) and Pltp(phase p to neutral long term voltage flicker). See
5.1.9 for definition.
Pst Short term flicker (10 minutes) including Pstpg (phase p to phase g short
term voltage flicker) and Pstp(phase p to neutral voltage flicker). See 5.1.9
for definition.
Pst1min Short term flicker (1 minutes) including Pst1minpg (phase p to phase g short
term voltage flicker) and Pst1minp(phase p to neutral voltage flicker). See
5.1.9 for definition.
 Q, Qi+,
Qc+, Qi-,
Qc-
Reactive power including Qp (phase p reactive power) and Qtot (total
reactive power). Minus sign indicates generated power and plus sign,
indicate consumed power. Inductive reactive character is marked with “i”
and capacitive reactive character is marked with “c”. See 5.1.5 and 5.1.6
for definition.
S, S+, S- Apparent power including Sp (phase p apparent power) and Stot (total
apparent power). See 5.1.5 and 5.1.6 for definition. Minus sign indicates
apparent power during generation and plus sign indicate apparent power
during consumption. See 5.1.5 and 5.1.6 for definition.
THDI Total harmonic distortion current related to fundamental, including THDIp
(phase p current THD) and THDIN (neutral current THD). See 5.1.8 for
definition
THDU total harmonic distortion voltage related to fundamental, including THDUpg
(phase p to phase g voltage THD) and THDUp (phase p to neutral voltage
THD). See 5.1.11 for definition.
u-Negative sequence voltage ratio (%). See 5.1.11 for definition.
u0Zero sequence voltage ratio (%). See 5.1.11 for definition.
U, URms RMS voltage, including Upg (phase p to phase g voltage) and Up (phase p
to neutral voltage). See 5.1.2 for definition.
U+Positive sequence voltage component on three phase systems. See
5.1.11 for definition.
U-Negative sequence voltage component on three phase systems. See
5.1.11 for definition.
U0Zero sequence voltage component on three phase systems. See 5.1.11
for definition.
UDip Minimal URms(1/2) voltage measured during dip occurrence

MI 2792 PowerQ4 Plus Introduction
11
UFnd Fundamental RMS voltage (Uh1 on 1st harmonics), including UpgFnd (phase
p to phase g fundamental RMS voltage) and UpFnd (phase p to neutral
fundamental RMS voltage). See 5.1.8 for definition
UhN nth voltage RMS harmonic component including UpghN(phase p to phase g
voltage nth RMS harmonic component) and UphN(phase p to neutral
voltage nth RMS harmonic component). See 5.1.8 for definition.
UihN nth voltage RMS interharmonic component including UpgihN(phase p to
phase g voltage nth RMS interharmonic component) and UpihN(phase p to
neutral voltage nth RMS interharmonic component). See 5.1.8 for
definition.
UInt Minimal URms(1/2) voltage measured during interrupt occurrence
UNom Nominal voltage, normally a voltage by which network is designated or
identified
UPk Peak voltage, including UpgPk (phase p to phase g voltage) and UpPk (phase
p to neutral voltage)
URms(1/2) RMS voltage refreshed each half-cycle, including UpgRms(1/2) (phase p to
phase g half-cycle voltage) and UpRms(1/2) (phase p to neutral half-cycle
voltage) See 5.1.12 for definition.
USwell Maximal URms(1/2) voltage measured during swell occurrence
USig Mains signalling RMS voltage. Signalling is a burst of signals, often
applied at a non-harmonic frequency, that remotely control equipment.
See 5.2.9 for details

MI 2792 PowerQ4 Plus Description
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2 Description
2.1 Front panel
1
2
3
4
5
6
7
Figure 2.1: Front panel
Front panel layout:
1. LCD Graphic display with LED backlight, 320 x 200 pixels.
2. F1 – F4 Function keys.
3. ARROW keys Move cursor and select parameters.
4. ENTER key Confirms new settings, step into submenu.
5. ESC key Exits any procedure, exit from submenu.
6. LIGHT key LCD backlight on/off (backlight automatically turns off after 15
minutes if no key action occurs).
If the LIGHT key is pressed for more then 1.5 seconds,
CONTRAST menu is displayed. Contrast can be adjusted
with the LEFT and RIGHT keys.
7. ON-OFF key Turns on/off the instrument.

MI 2792 PowerQ4 Plus Description
13
2.2 Connector panel
IN I3 C B AI1
L1L3C
N
A
I2
L2B
1
2
Warning!
Use safety test leads only!
Max. permissible voltage between voltage
input terminals and ground is 1000 VRMS !
Figure 2.2: Top connector panel
Top connector panel layout:
1 Clamp-on current transformers (I1, I2, I3, IN ) input terminals.
2 Voltage (L1, L2, L3, N, GND) input terminals.
Figure 2.3: Side connector panel
Side connector panel layout:
1 External power socket.
2 PS-2 – RS-232/GPS serial connector.
3 USB/GPRS – Connector.
3
2
1

MI 2792 PowerQ4 Plus Description
14
2.3 Bottom view
Figure 2.4: Bottom view
Bottom view layout:
1. Battery compartment.
2. Battery compartment screw (unscrew to replace the batteries).
3. Serial number label.
2.4 Accessories
2.4.1 Standard accessories
Table 2.1: PowerQ4 Plus standard accessories
Description Peaces
Flexible current clamp 3000 A / 300 A / 30 A (A 1227) 4
Temperature probe (A 1354) 1
Test probe, red 2
Test probe (CAT II), red 3
Test probe (CAT II), black 1
Crocodile clip, red 3
Crocodile clip, black 1
Crocodile clip, green 1
Voltage measurement cable, red 3
1
2
1
3

MI 2792 PowerQ4 Plus Description
15
Voltage measurement cable, black 1
Voltage measurement cable, green 1
USB cable 1
RS232 cable 1
12 V / 1.2 A Power supply adapter 1
NiMH rechargeable battery, type HR 6 (AA) 6
Soft carrying bag 1
Instruction manual for PowerQ4 Plus 1
Compact disk contest – related to PowerQ4 Plus
PC software PowerView v2.0 with instruction manual
Instruction manual for PowerQ4 Plus
Handbook ”Modern Power Quality Measurement Techniques”
2.4.2 Optional accessories
Table 2.2: PowerQ4 Plus optional accessories
Ord.
code
Description
A 1020 Small soft carrying bag
A 1033 Current clamp 1000 A / 1 V
A 1037 Current transformer 5 A / 1 V
A 1039 Connection cable for current clamp
A 1069 Mini current clamp 100 A / 1 V
A 1122 Mini current clamp 5 A / 1 V
A 1179 3-phase flexible current clamps
2000 A / 200 A / 20 A
S 2014 Safety fuse adapters
S 2015 Safety flat clamps
A 1281 Current clamp 5 A / 100 A / 1000 A
A 1355 GPS Receiver
A 1356 GPRS Modem

MI 2792 PowerQ4 Plus Operating the instrument
16
3 Operating the instrument
This section describes how to operate the instrument. The instrument front panel
consists of a graphic LCD display and keypad. Measured data and instrument status
are shown on the display. Basic display symbols and keys description is shown on
figure bellow.
PowerQ4 Plus
Power On/Off
Escape:
Exit any
procedure
Function keys:
It's functions
depends on
active screen
Cursor keys:
·Move
·Zoom
·Scroll
Enter:
Select
procedure
Press & Hold for
contrast adjustment
Backlight On/Off
Indicate that
supply adapter
is connected to
the instrument
Battery status:
·Animated icon – indicate battery charging
·Static icon – Indicate charge level
GPS status
(Optional)
Current time
and date
GPRS status
(Optional)
Figure 3.1: Display symbols and keys description
During measurement campaign various screens can be displayed. Most screens share
common labels and symbols. These are shown on figure bellow.

MI 2792 PowerQ4 Plus Operating the instrument
17
Screen Name
Displayed
range
First sample
time-stamp
Last sample
time-stamp
Current time
Recorder status:
Recording
Not recording
Busy
Hold
Options for
function keys
(F1 – F4)
Figure 3.2: Common display symbols and labels during measurement campaign
3.1 Instrument Main Menu
After powering on the instrument the “MAIN MENU” is displayed. From this menu all
instrument functions can be selected.
Figure 3.3: “MAIN MENU”
Table 3.1: Instrument screen symbols and abbreviations
Battery status
Animated icon – indicate battery charging
Static icon – Indicate charge level
Indicate that charger is connected to the instrument
GPS module status (Optional accessory A 1355)
GPS module detected but reporting invalid time and position data
(searching for satellites or too weak satellite signal)
GPS time valid – valid satellite GPS time signal)
GPRS modem status (Optional accessory A 1356)
GPRS is in initialization mode (see section 4.2.6 for details)

MI 2792 PowerQ4 Plus Operating the instrument
18
GPRS modem is ready to receive user call (see section 4.2.6 for
details)
GPRS communication is in progress (see section 4.2.6 for details)
Current time and date
Table 3.2: Keys functions
Select function from the “MAIN MENU”.
Enter selected function.
3.1.1 Instrument main functions
By pressing ENTER function, user can select one of four menu subgroup of function:
Measurements – set of basic measurement screens,
Recorder – setup and view of various recording,
Measurement Setup –parameterization of measurement parameters/procedures,
General Setup – configuring or checking of other instrument parameters.
List of all submenu are presented on following figure.
Figure 3.4: Measurements menu Figure 3.5: Recorders menu
Figure 3.6: Measurement setup menu Figure 3.7: General setup menu

MI 2792 PowerQ4 Plus Operating the instrument
19
3.2 U, I, f menu
All important voltage, current and frequency parameters can be observed in the “U, I, f”
menu. Measurements results can be viewed in a tabular (METER) or a graphical form
(SCOPE, TREND). TREND view is active only in RECORDING mode. See section 3.9
for details.
3.2.1 Meter
By entering U, I, f menu, the U, I, f – METER tabular screen is shown (see figure
below).
Figure 3.8: U, I, f meter table screens
In those screens on-line voltage and current measurements are shown. Descriptions of
symbol and abbreviations used in this menu are shown in table bellow.
Table 3.3: Instrument screen symbols and abbreviations
Show currently displayed channel.
Current recorder status
RECORDER is active
RECORDER is busy (retrieving data from memory)
RECORDER is not active
Current instrument time
RMS True effective value URms and IRms
THD Total harmonic distortion THDUand THDI
CF Crest factor CfUand CfI
PEAK Peak value UPk and IPk
MAX ½ Maximal URms(1/2) voltage and maximal I½Rms current, measured after
RESET (key: F2)
MIN ½ Minimal URms(1/2) voltage and minimal I½Rms current, measured after
RESET (key: F2)
f Frequency on reference channel

MI 2792 PowerQ4 Plus Operating the instrument
20
Note: In case of AD converter overloading current and voltage value will be displayed
with inverted color 250.4 V.
Note: If phase current and voltage value are not within 10% ÷ 150% of the range, their
values will be displayed with inverted color 250.4 V.
Table 3.4: Keys functions
Waveform snapshoot:
Hold measurement on display
Save held measurement into memory
Reset MAX ½ and MIN ½ values (URms(1/2) and I½Rms)
Show frequency trend (available only during recording)
Show measurements for phase L1
Show measurements for phase L2
Show measurements for phase L3
Show measurements for neutral channel
Summary of all phases measurements
Show phase-to-phase voltages measurements
Switch to METER view.
Switch to SCOPE view
Switch to TREND view (available only during recording)
Return to the “MEASUREMENTS” menu screen.
3.2.2 Scope
Various combinations of voltage and current waveforms are displayed.
Figure 3.9: Voltage waveform
Figure 3.10: Current waveform