Megger MPAC128 Professional Acoustic Imager User Guide
- June 27, 2024
- Megger
Table of Contents
MPAC128 Professional Acoustic Imager
Specifications:
- Product Name: MPAC128 and MPAC128-ATEX
- Type: Professional Acoustic Imager
- Manufacturer: Megger Instruments Limited
- Website: www.megger.com
- Model: MPAC128 and MPAC128-ATEX
- Compliance: European Directives 2011/65/EU, 2014/30/EU,
2014/34/EU, 2014/53/EU, 2014/35/EU
Product Usage Instructions:
1. Introduction
Product Description: The MPAC128 and MPAC128-ATEX are
professional acoustic imagers designed for various
applications.
Company Website: Visit megger.com for more
information and
support.
2. Safety Warnings and Standards
Ensure to follow all warnings, cautions, and notes provided in
the user manual.
For MPAC128-ATEX, pay special attention to explosion-proof
notes.
3. Instrument Overview
Get familiar with the different parts and features of the
acoustic imager by referring to the user manual.
4. Operation
Follow the instructions in the user manual to operate the
MPAC128 or MPAC128-ATEX effectively.
5. Measurement Advice
Refer to the user guide for guidance on making accurate
measurements using the acoustic imager.
FAQ:
Q: Where can I find firmware updates for the MPAC128 and
MPAC128-ATEX?
A: Firmware updates can be found on the Megger website at
megger.com/support.
Q: How do I register my MPAC128 or MPAC128-ATEX?
A: To register your product, visit
megger.com/register and
follow the instructions provided.
MPAC128 and MPAC128-ATEX
Megger Professional Acoustic Imager
User Guide
Register megger.com/register
User Guide Firmware updates
Support megger.com/support
EN
English
This document is copyright of:
Megger Limited, Archcliffe Road, Dover, Kent CT17 9EN. ENGLAND T +44 (0)1304
502101 F +44 (0)1304 207342 www.megger.com
Megger Instruments Limited reserves the right to alter the specification of
its products from time to time without notice. Although every effort is made
to ensure the accuracy of the information contained within this document it is
not warranted or represented by Megger Limited to be a complete and up – to –
date description.
For Patent information about this instrument refer to the following web site:
megger.com/patents
2
MPAC128 and MPAC128-ATEX
www.megger.com
This manual supersedes all previous issues of this manual. Please visit the
Megger website to ensure that you are using the most recent issue of this
document. Destroy any copies that are of an older issue.
Declaration of Conformity
Hereby, Megger Instruments Limited declares the MPAC128 and MPAC128-ATEX
professional acoustic cameras have been built in conformity with the following
European Directives where they apply: 2011/65/EU 2014/30/EU 2014/34/EUh
Hereby, Megger Instruments Limited declares that radio equipment manufactured
by Megger Instruments Limited described in this user guide is in compliance
with Directive 2014/53/EU. Other equipment manufactured by Megger Instruments
Limited described in this user guide is in compliance with Directives
2014/30/EU and 2014/35/EU where they apply. The full text of Megger
Instruments EU declarations of conformity are available at the following
internet address: megger.com/eu-dofc
www.megger.com
MPAC128 and MPAC128-ATEX
3
Contents
1. Introduction ……………………………………………………………………………………. 6
1.1 Product description ……………………………………………………………………………………… 6 1.2 Company
website ………………………………………………………………………………………… 6
2. Safety warnings and standards ……………………………………………………….. 7
2.1 Warnings, cautions and notes ………………………………………………………………………. 7 2.2 Explosion-
proof note clause MPAC128-ATEX …………………………………………………. 7 2.3 Safety warnings
…………………………………………………………………………………………… 7
2.3.1 Installation category definitions: ………………………………………………………………………………8 2.4
Safety, hazard and warning symbols on the instrument…………………………………. 8
3. Instrument overview……………………………………………………………………….. 9
3.1 Instrument layout………………………………………………………………………………………… 9 3.2 Software
interface……………………………………………………………………………………….. 9 3.4 MicroSD card
slot……………………………………………………………………………………….. 10 3.5 USB-C communication socket
……………………………………………………………………… 10 3.6 Tripod
……………………………………………………………………………………………………….. 10 3.7 Hand straps and shoulder
strap…………………………………………………………………… 11
4. Operation……………………………………………………………………………………… 12
4.1 Dynamic range…………………………………………………………………………………………… 12 4.2 Test frequency
range………………………………………………………………………………….. 12 4.3 Function menu bar
…………………………………………………………………………………….. 12 4.4 Menu
icons………………………………………………………………………………………………… 13
4.4.1 Focus ………………………………………………………………………………………………………………..13 4.4.2 Photo and
video………………………………………………………………………………………………….14 4.4.3 Playback
……………………………………………………………………………………………………………14 4.4.4
Tagging……………………………………………………………………………………………………………..16 4.4.5
Acoustic…………………………………………………………………………………………………………….19 4.4.6 Display
……………………………………………………………………………………………………………..20 4.4.7
System………………………………………………………………………………………………………………20 4.5 Mode functions
…………………………………………………………………………………………. 23 4.5.1 Gas
leak…………………………………………………………………………………………………………….23 4.5.2 Estimation of gas
leakage …………………………………………………………………………………….24 4.5.3 Partial
discharge………………………………………………………………………………………………….24
4
MPAC128 and MPAC128-ATEX
www.megger.com
5. Measurement advise……………………………………………………………………… 25
5.1 Capture sound source ………………………………………………………………………………… 25 5.2 Reflected
sound…………………………………………………………………………………………. 25 5.3 Noise interference
……………………………………………………………………………………… 25
6. Maintenance ………………………………………………………………………………… 26
6.1 General maintenance…………………………………………………………………………………. 26 6.2 Cleaning
……………………………………………………………………………………………………. 26
7. Battery information ………………………………………………………………………. 27
7.1 About the battery ……………………………………………………………………………………… 27 7.2 About charging
the battery………………………………………………………………………… 27 7.3 Charge the battery
…………………………………………………………………………………….. 27 7.4 Optimising the battery life
…………………………………………………………………………. 28
8. Specifications………………………………………………………………………………… 29 9. Accessories and
equipment ……………………………………………………………. 31
9.1 Included accessories …………………………………………………………………………………… 31
10. Terminology ……………………………………………………………………………….. 32 11. Calibration, repair
and warranty ………………………………………………….. 33
11.1 Return procedure …………………………………………………………………………………….. 33
12. Decommissioning ………………………………………………………………………… 34
12.1 WEEE directive…………………………………………………………………………………………. 34 12.2 Battery
disposal ……………………………………………………………………………………….. 34
13. Worldwide sales offices ……………………………………………………………….. 35
www.megger.com
MPAC128 and MPAC128-ATEX
5
Introduction
1. Introduction
This guide explains how to use the Megger professional acoustic cameras
MPAC128 and MPAC128-ATEX. Please read the guide carefully before you start
using the cameras.
1.1 Product description
MPAC128 and MPAC128-ATEX are hand-held professional acoustic imagers that
support both audible and ultrasonic frequencies. The MPAC128-ATEX has a II 3G
Ex ic IIC T5 Gc explosion-proof rating. The cameras use microphone array
beamforming technology to acquire, measure and visually display the sound
source data, overlaid on a real time high definition video image. By
integrating the sound source data with the video image, the changing sound
source is dynamically displayed on the screen in the form of a “sound map”.
Both the MPAC128 and MPAC128-ATEX Professional Acoustic Cameras aid the
detection of air or gas leaks in both compressed and vacuum systems, even in
noisy industrial environments. When used in power systems, they can help to
safely and quickly identify partial discharge where dielectric breakdown is
occurring. The cameras are designed and built for use in industrial
applications where both moisture and dust may be encountered, with the case
built from a strong and durable machined aluminium alloy. The instruments are
simple and convenient to operate. They require adjustment of only two
parameters: the measurement frequency range and the dynamic range. They offer
both picture and video capture modes, making data recording easy and flexible.
Test results are can be downloaded from the removable microSD card, or via the
USB-C port, to allow for analysis and report generation. Please ensure all the
safety warnings within this manual are read and understood before operating
the cameras.
1.2 Company website
Occasionally an information bulletin may be issued via the Megger website.
This may concern new accessories, new usage instructions or a software update.
Check on the Megger website for anything applicable to your Megger
instruments. www.megger.com
6
MPAC128 and MPAC128-ATEX
www.megger.com
Safety warnings and standards
2. Safety warnings and standards
These safety warnings must be read and understood before the instrument is
used. Retain for future reference. The cameras should only be operated by
suitably trained and competent people.
2.1 Warnings, cautions and notes
This user guide follows the internationally recognised definition of warnings,
cautions and notes. These instructions must be adhered to at all times.
Description
WARNING : Indicates a potentially dangerous situation which, if ignored, could
lead to death, serious injury or health problems.
CAUTION : Indicates a situation which could lead to damage of the equipment or
environment.
NOTE : Indicates important instructions to be followed to perform the relevant
process safely and efficiently.
2.2 Explosion-proof note clause MPAC128-ATEX
This equipment is explosion-proof, its grade is II 3G Ex ic IIC T5 Gc. It must
be used in accordance with the explosion-proof marks in explosive
environments.
When using in an explosive environment, do NOT remove or replace batteries or
recharge the battery pack. In an explosive environment, do NOT connect any USB
devices, external power supplies, chargers or other
peripherals In an explosive environment, ensure that the silica gel baseplate
stays firmly in place. Do NOT insert or remove the microSD card or connect the
headset in an explosive environment. The electrical accessories provided with
the MPAC128-ATEX are not to be used in an explosive atmosphere.
2.3 Safety warnings
If the equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.
There are no user-serviceable parts inside the cameras; all servicing must be
referred to Megger approved service centres.
Check the camera for damage before use. The camera must NOT be used if any
part of it is damaged. The camera must NOT be used in the case of malfunction
or abnormal heat. Do NOT place or store the camera near a heat source, flame
or in a high temperature environment. This camera contains a Lithium-ion
battery.
The battery is NOT user serviceable. All servicing must be referred to Megger
approved service centres. Do NOT charge the battery in a high temperature
environment (over 45 °C). In the event of a battery cell leaking, do not allow
the released fluid to come into contact with the skin or eyes. If contact has
been made, wash the affected area with plenty of water and seek medical advice
immediately.
www.megger.com
MPAC128 and MPAC128-ATEX
7
Safety warnings and standards
2.3.1 Installation category definitions:
CAT IV – Measurement category IV: Equipment connected between the origin of
the low-voltage mains supply and distribution panel.
CAT III -Measurement category III: Equipment connected between the
distribution panel and electrical outlets. CAT II – Measurement category II:
Equipment connected between the electrical outlets and user’s equipment.
Measurement equipment may be safely connected to circuits at the marked rating
or lower. The connection rating is that of the lowest rated component in the
measurement circuit.
2.4 Safety, hazard and warning symbols on the instrument
This paragraph details the various safety and hazard icons on the instrument’s outer case.
Icon
Description
Conforms to the European Explosive Atmospheres (ATEX) directive (MPAC128-ATEX model only)
G
Caution: Refer to user guide.
UK conformity. This equipment complies with current UK legislation.
EU conformity. Equipment complies with current EU directives.
Conforms to relevant Australian Safety and EMC standards. Do not dispose of to landfill, in sewage systems or by fire.
8
MPAC128 and MPAC128-ATEX
www.megger.com
3. Instrument overview
3.1 Instrument layout
91
2
9
Instrument overview 3 45
9
9
Item 1 2 3 4
Description Power button Hot key MicroSD card slot USB-C Charging socket
3.2 Software interface
1
2 3 45
9
Item 5 6 7 8 9
6
78
9
Description Headphone socket Threaded tripod mount USB-C Communication socket Charging indicator LED Hand straps and shoulder strap points
Item 1 2 3 4
6
78
Description Video image display Sound pressure level Photo/Video mode icon System time and date
Item 5 6 7 8
Description Battery status indicator Function menu bar Dynamic range quick setup Spectrum and frequency range box
www.megger.com
MPAC128 and MPAC128-ATEX
9
Instrument overview
3.4 MicroSD card slot
Do not remove or insert the microSD card when video recording. After taking
photos and recording videos, wait until the data is saved successfully before
inserting
the microSD card. Do not remove or insert the microSD card when browsing and
marking data in the playback menu.
Test data may not be correctly identified and displayed in the playback menu.
3.5 USB-C communication socket
Do not remove or insert the USB-C flash drive when video recording. After
taking photos and recording videos, wait until the data is saved successfully
before inserting the USB-C
flash drive. Do not remove or insert the USB-C flash drive when browsing and
marking data in the playback menu.
Test data may not be correctly identified and displayed in the playback menu.
Inserting either the USB-C flash drive or microSD card will initiate an
automatic transfer of the images and videos
stored in the cameras internal memory. The stored files can be transferred to
the Acoustic Analysis software or downloaded for storage on a PC or
laptop.
3.6 Tripod
Threaded tripod mounting point
CAUTION : Ensure tripod and mount screws are tight and secure before use. 10 MPAC128 and MPAC128-ATEX
www.megger.com
3.7 Hand straps and shoulder strap
Instrument overview
Caution: ensure all strap connections are fitted correctly and secure before use.
www.megger.com
MPAC128 and MPAC128-ATEX 11
Operation
4. Operation
4.1 Dynamic range
Tap the colour dB bar on the main interface to toggle the dynamic range slider
bar on and off
Dynamic range slide bar will stay visible for about 5 seconds. Touch and move
the slider to adjust the dynamic range.
Tap the colour dB bar to close
4.2 Test frequency range
Define the upper and lower limit of the frequency range by touching and
sliding either of the box handles. Maximum spread: 20 kHz Touch and slide the
centre of the selection box to move the defined range into position.
4.3 Function menu bar
1. Tap the video display area of the screen to reveal the function menu bar.
If untouched, the menu will stay visible for about 5 seconds
12 MPAC128 and MPAC128-ATEX
www.megger.com
2. Tap the video area to toggle the function menu bar on and off.
Operation
4.4 Menu icons
Focus
Photo Playback Acoustic Display System Mode
Item
Description
Turns on focus mode
Focus
4.4.1 Focus on page 13
Photo
Video
Playback
Toggle photo/video modes 4.4.2 Photo and video on page 14 Playback: access stored videos and images 4.4.3 Playback on page 14
Item
Acoustic Display System
Mode
4.4.1 Focus
When the measurement environment is noisy or there are multiple gas
leaks/partial discharge occurrences, the focusing function can be used to
display data on measurements within the focus ring only, eliminating
interference.
Description Acoustic settings menu 4.4.5 Acoustic on page 19 Display settings
menu 4.4.6 Display on page 20
System settings menu 4.4.7 System on page 20
Gas leak and partial discharge modes 4.5 Mode functions on page 23
Double-tap the centre of the focus ring to reduce the size for pinpoint location.
Double-tap again to restore the focus ring to its initial size.
Focus is switchable in partial discharge mode and always on in gas leak mode.
www.megger.com
MPAC128 and MPAC128-ATEX 13
Operation 4.4.2 Photo and video
Tap the photo/video button on the function menu bar to switch between photo
(still picture) mode and video mode.
Photo
Video
The icon in the upper right corner of the video image display indicates the current mode selected.
a. In Photo mode, press the hot key (right) to save the displayed image b. In
Video mode, press the hot key (right) to start recording and press again to
stop; video recording will automatically stop after 5 minutes, the video is
automatically saved.
During video recording, the elapsed time of the recording is visible next to
the video icon.
Saved photos and videos are named by date and image number for that day.
4.4.3 Playback Pictures and recorded videos can be viewed, deleted or have
details added or deleted in the playback window. Tap a photo or video to load
the full-size image or play the video.
Tap multi-select (left), followed by the list icon (right) to select all the
videos or photos. All will become highlighted. Individual photos and videos
can be de-selected by tapping them individually.
To delete all selected images and videos, tap the delete (bin) icon in the top
right hand corner.
14 MPAC128 and MPAC128-ATEX
www.megger.com
To add detail information to selected images, tap the pen icon. A separate
details box will appear. Tap the save icon to save the updated details.
Tap the information icon to display used and available storage space.
The current file directory is shown on the screen. The arrow next to the
directory name will bring up a list of available directories that can be
selected. Files can then be accessed or saved to this directory.
The + icon, next to the directory name, allows a new directory to be created.
A box will appear that allows the directory name to be entered, along with
other details relating to the site. Tap the save icon to save the updated
details.
Toggle the All slider to allow all new photo and video files to be copied into
a new folder (the `All’ folder) created on the microSD card. This makes
accessing the individual photo or video files easier when downloading. Any
photos or videos taken before this will need to be copied individually (see
below). The Copy icon allows either individually selected photo or video files
to be copied to the ‘All’ folder, created on the microSD card.
Picture playback With a photo or video selected and displayed on the screen,
pressing the < or > arrows will display the previous or next file.
Double tapping a photo will activate the zoom feature. After enlarging, touch
and slide the zoomed image to view specific parts of the original image;
double-tap the picture again to restore it to its original size. The zoom
feature only operates with saved photo images.
www.megger.com
Operation MPAC128 and MPAC128-ATEX 15
Operation Video playback
With a photo or video selected and displayed on the screen, pressing the < or
arrows will display the previous or next file.
Select a video file from the playback main screen. Video playback starts automatically. Tap the screen to stop or restart playback. Slide the progress bar below the video to navigate the playing position. 4.4.4 Tagging Photo and video tagging In Playback mode, tap a video or photo to bring up the tagging menu across the bottom of the screen.
Tap the label icon on the far left to add or edit the electrical or gas related parameters, relating to the file.
Tap a flag icon to mark a video or picture for tagging with an image, an audio recording or text.
16 MPAC128 and MPAC128-ATEX
www.megger.com
Operation Image tagging When tagging a photo, it is possible to add another
image into the tag content, the image can be something that relates to the
photo, such as a nameplate, warning sign or character tag, etc.
Tap a flag icon to select the image markers.
Tap Image. The visible light camera becomes active and the image is displayed.
Press the hot key to take the photograph. This can then be saved, retaken or
discarded by tapping the return icon.
Audio tagging Audio tag can record an audio file as the tag content. Tap a
flag icon to select the audio markers.
Tap Audio. Ensure the microphone array is close to the source to improve
quality of sound recording.
Press the hot key on the right to record an audio using the front microphone
array. Recorded audio files can be played back using the provided headphones.
Press the hot key to save the audio file.
www.megger.com
MPAC128 and MPAC128-ATEX 17
Operation Text tagging Tap a flag icon to select the text markers.
Tap Text and then tap the keyboard icon.
Text tag can be used to input a description. The instrument supports keyboard
input and the two-dimensional code scanning. Tap the input box to display the
keyboard and type relevant information to be saved. Tap the Save icon to save
the content QR Code tagging Tap a flag icon to select the QR code markers.
Tap Text and then tap the two-dimensional code scan icon.
The device will start the camera to scan the QR code automatically. When
scanned successfully, the contents from the scanned QR code will be displayed.
Tap the Save icon to save the content or tap “Rescan” to scan the code again
18 MPAC128 and MPAC128-ATEX
www.megger.com
4.4.5 Acoustic
1 2 3 4
Operation
5
6
Item
Description
Item
Description
1
Dynamic range setting
4
Steady setting (On/Off)
2
Cursor and SPL setting
5
Monitor: ultrasonic monitoring settings
3
Record sound while recording video (On/Off)
6
Self-check settings
Dynamic range
Use the slider or touch the palette bar on the right of the screen to adjust
the dynamic range.
Cursor and SPL (Sound Pressure Level)
Up to three cursors can be made active at the same time.
The Cursor and SPL function is displayed on the default Acoustic menu. Between
1 and 3 cursors can be selected to be displayed on the video screen with their
cursor numbers below. The image energy at each cursor position will be
displayed to the upper right: the sound pressure level at cursors 1, 2 and 3
will be displayed from top to bottom.
Record sound while recording video
Touch the Record on Video-shooting button to toggle audio on or off while
recording video.
Steady
Touch the Steady mode button to toggle the steady mode on or off.
When the steady mode is turned off, the sound processor increases the response
time to ensure transient signals are captured and fast changes of sound source
can be identified. It is particularly suitable for locating rapidly changing
partial discharge sound sources. With the steady mode on, the sound processor
has a dampened response to ensure changing sound sources are displayed as a
relatively stable images. This helps pin-point location of stable sound
sources.
Monitor: ultrasonic monitoring
The equipment can modulate ultrasonic signals into the audible frequency band.
The signal can be monitored as an audible sound using the headphones.
Tap Monitor to display the modulation controls. Tap the Switch button to turn
the modulation on or off. Touch and move the reference frequency slider to
find the best audible signal. It is recommended to use a frequency of about
38.6 kHz for near modulation and monitoring.
Self-check
The MPAC cameras have a built in self-test. This checks internal measurement
components and the correct operation of the microphone array. In the event of
any issue, contact a Megger Approved Service Centre. It is recommended the
self-check is run on a regular basis to ensure optimum performance.
www.megger.com
MPAC128 and MPAC128-ATEX 19
Operation 4.4.6 Display
The Display icon opens the display settings menu. Brightness
The brightness can be adjusted using the slider along with the colour palette. When used outdoors, it is recommended to increase the brightness for better visual clarity. When used indoors, reduce the brightness for a longer battery life.
Rainbow Ironbow Grayscale
To change colour palette, select one of the 3 options available. to use
rainbow palette.
to use ironbow palette.
to use grayscale palette.
4.4.7 System The System icon opens a range of settings that can be adjusted:
Item 1 2 3
Description Language on page 20 Time on page 21 Lock on page 21
Item 4 5
Language Multiple languages are supported by the MPAC cameras.
Tap the Language icon from the System menu bar to display the current
languages.
The current language is displayed. Tap to view the drop-down list of available languages.
Description Tool on page 21 About on page 22
Tap the required language.
20 MPAC128 and MPAC128-ATEX
www.megger.com
Time The date and time is user-adjustable using simple scroll wheels
Tap the Time icon from the System menu bar to display the adjustable scroll
wheels. Touch and move the scroll wheels up and down to change the date and
time in turn. Tap Update Time to save.
Operation
Lock The lock menu opens the settings for Auto sleep and Auto shutdown
functions. These can be turned on to save battery. When the auto sleep is
active, the power indicator will flash.
Tap the Lock icon from the System menu bar to display the auto sleep and auto
shut down options.
Select a time setting from the Auto sleep drop down menu. The device will
automatically enter sleep mode if there is no user input for the specified
time. Press the power button to exit sleep mode.
Select a time setting from the Auto shutdown drop down menu. The device will
automatically shutdown if there is no user input for the specified time.
Tool Tap Export and confirm OK to export the equipment operation log to the
microSD card. The equipment operation log is used by the manufacturer to
diagnose the equipment status, and users generally do not need to use it. The
Threshold setting is used to avoid low level interference. For example, if you
set Threshold to 30dB, only sound sources with an SPL exceeding 30dB will be
detected and imaged. The decibel level is adjusted by moving the slider. High
sensitivity is used for detecting minor faults by increasing the sensors
sensitivity. However, activating this mode reduces the device’s resistance to
interference, so it is generally recommended to use it only in a quiet
environment and when the fault point is close to the MPAC unit.
www.megger.com
MPAC128 and MPAC128-ATEX 21
Operation About This displays the device model, serial number, software
version and licence manufacturer information.
IP Address: Press IP, to show the static IP address of the camera. Using a
USB-C to Ethernet cable, the camera can be connected directly to the PC/laptop
to access the stored files.
Update: Download updates from the Megger website. Save the updates to an
external storage device (USB-C flash drive/microSD card). Insert the external
storage device into the MPAC. Tap Update in the about icon to see the
available packages saved on the external storage device and update the unit.
NOTE : Updates are released via the Megger website and can be downloaded free
of charge.
Licence: A user licence for the camera, if required, can be imported using an
external storage device. If a licence has expired, the internal licence can be
exported to the external storage device to be sent to Megger for
authorisation.
NOTE : Visit Megger website for downloading Analysis software or for firmware
update.
22 MPAC128 and MPAC128-ATEX
www.megger.com
4.5 Mode functions
Operation
The More menu function allows the user to switch between gas leak and partial discharge measurement modes
4.5.1 Gas leak Tap the Gas Leak tab to bring up the gas leak menu.
All displayed variables for gas leakage measurement and calculation can be
edited. See 4.5.2 Estimation of gas leakage on page 24 for more details
Setting different leakage correction values can make the measurement of
leakage more accurate. Tap the Advanced button to bring up the leak correction
variable box, to correct the leakage amount
The default unit is ml/s. This can be changed under the Gas Unit drop down
menu.
To set different leakage correction value, tap the button on the right to
confirm and write the leakage value. For example, if the device measures a
leakage of 2 ml/s and the standard data is 5 ml/s, a more accurate measurement
can be achieved by writing a correction value of 5 ml/s.
www.megger.com
MPAC128 and MPAC128-ATEX 23
Operation
4.5.2 Estimation of gas leakage
Tap Gas Leak from the More option on the function menu to open the gas leak
setting menu.
NOTE : Selecting Gas Leak will turn on Focusing by default to avoid
interference.
Tap the Gas Leak button to select. Completing the input variables shown will
allow the camera to carry out volume and cost calculations for the measured
leak.
When measuring gas leaks, there are options to input the gas pressure and
distance to the leak. The user needs to input the gas pressure and select
measurement units and set the distance (in meters) to the measured leak, or
set distance to Auto. The software will calculate and display the leakage
level, leak rate and approximate cost per year. The gas leakage levels are
divided into 7 levels and the corresponding leakage ranges for reference are
shown:
Leakage Level
Leakage Range (Unit: ml / s)
Leakage Range (Unit: L / min)
0
<0.167 ml/s
<0.01 L/min
1
0.167 ml/s
<1.667 ml/s
0.01 L/min <0.1 L/min
2
1.667 ml/s
<16.667 ml/s
0.1 L/min
<1 L/min
3
16.667 ml/s
<166.667 ml/s
1 L/min
<10 L/min
4
166.667 ml/s
<1666.667 ml/s
10 L/min
<100 L/min
5
1666.667 ml/s <16666.67 ml/s
100 L/min
<1000 L/min
6
16666.67 ml/s <166666.7 ml/s
1000 L/min <10000 L/min
The actual leakage level displayed on the device is not an integer. Ceiling
rounding method is used for the leakage levels provided in the above table.
For example, if a measured Leakage Level at a certain point is 2.1, with a
leakage of 1.15 l/min, the corresponding standard Leakage Level would be 3
according to the table.
4.5.3 Partial discharge
Tap the Partial Discharge icon from the Mode menu bar to bring up the partial
discharge menu.
Tap the PRPD (Phase Resolved Partial Discharge) Graph toggle button can be
switched on or off.
The Sync Frequency can be selected as 50 Hz or 60 Hz.
Partial discharge spectrum
Tap the PRPD Graph button to open and display the partial discharge spectrum.
The partial discharge spectrum is as shown in the image. Observing the
characteristics of the spectrum can help users identify the discharge type.
The internal algorithm will calculate and display discharge types when
identified: Surface, Corona, etc.
24 MPAC128 and MPAC128-ATEX
www.megger.com
5. Measurement advise
Measurement advise
5.1 Capture sound source
Observe whether there are prominent spectral signals or spectral spikes in the
spectrum diagram. If there are, move the select box to include the frequency
range where the prominent spectral signal or frequency spike is, and then
observe if any sound source appears in the cloud image.
Adjust the dynamic range to a larger value, the device may simultaneously
capture more than one sound source in the screen. When the SPL of multiple
sources in the picture differ significantly, the relatively small dynamic
range parameter may cause the larger sources to drown out the smaller one.
5.2 Reflected sound
When unable to determine if the sound source is an actual sound source or a
reflection, move to view the sound source from different test positions. If
the sound source remains steady, this indicates an actual sound source. A
reflection may move or disappear when measured from different angles.
5.3 Noise interference
It is easy to be disturbed by environmental noise in the low frequency band.
If possible, it is recommended to use mid to high frequency signals to
identify the location of sound source.
A relatively narrow band range is always recommended to minimise or eliminate
interference noise.
www.megger.com
MPAC128 and MPAC128-ATEX 25
Maintenance
6. Maintenance
NOTE : There are no user replaceable parts within this product.
6.1 General maintenance
Keep acoustic sensor holes clean and prevent dust accumulation; if the holes
have dust, blow air gently to clean using a lens cleaner blower/brush or
similar. When not in use for a long period of time, charge the battery and
store at room temperature in the supplied carry case. Regular inspection and
charging can effectively increase service life of the battery.
6.2 Cleaning
Disconnect from mains power/charger. Wipe the instrument with a clean cloth
dampened with either water or isopropyl alcohol (IPA). Do not use abrasive
cleaners as damage may occur.
26 MPAC128 and MPAC128-ATEX
www.megger.com
7. Battery information
Battery information
7.1 About the battery
The MPAC128 series has an internal, 6600 mAh Lithium-ion rechargeable battery,
which currently provides the best performance for your device. These batteries
are lighter, charge faster, last longer compared to traditional batteries, and
have a higher power density for more battery life. The MPAC128 will last about
four hours use from a fully charged battery.
7.2 About charging the battery
The battery icon in the top-right corner shows the battery level or charging
status.
All four bars lit up in the battery icon show its fully charged, as the
battery discharges these bars will indicate the battery charge level.
If the battery is very low on power, it may display an image of a nearly
depleted battery, indicating that it needs to be charged. If the battery is
extremely low you may have to charge it for several minutes before you can use
the MPAC128 again.
7.3 Charge the battery
1. Ensure the MPAC128 is switched off before and during charging. 2. Connect
MPAC128 to a power outlet using the charging cable and USB-C power adapter
(included) or other
compatible power adapter (sold separately).
NOTE : You can also use third-party power adapters, the device supports the
USB Power Delivery (USB PD) quick charging protocol through USB-C cable. It is
recommended to use a power adapter or power bank that supports 12 V to 20 V
voltage output and the minimum output power is not less than 15 W to charge
the device.
3. When the battery is fully charged, battery icon in the top-right corner
will show four solid bars on the battery symbol.
4. It is recommended to remove the charge cable from the MPAC128 when it is
fully charged. WARNING : If you suspect there may be liquid in the charging
port of MPAC128, don’t plug the charging cable into it.
www.megger.com
MPAC128 and MPAC128-ATEX 27
Battery information
7.4 Optimising the battery life
Do not charge the device for more than 24 hours. If it is not used for a long
time, please charge the battery regularly. If being stored without use, charge
the device every two months to 80% (three bars). If used regularly, charge the
device every week. For daily use, charge the device when battery level is
below 30%. It is recommended to store the device within -20 °C to +45 °C.
NOTE : The battery has limited recharge cycles and may eventually need to be
replaced. Battery life and charge cycles vary by use and settings. If you find
yourself charging your device more frequently, it might be time for a new
battery. The batteries should be serviced by Megger or an authorised service
provider, do not disassemble the device. See the service contact section at
the end of the user guide for more details.
28 MPAC128 and MPAC128-ATEX
www.megger.com
8. Specifications
Specification Acoustic Specification Microphone array Effective test bandwidth
Dynamic range Test sound pressure level range Auto max/min dB gain Number of
digits Sound image FOV
Sound image frame rate Detect distances Leak detection rate
Camera Camera FOV
Camera focal length Camera pixel
Display Resolution Size Touch screen Brightness Photo notes Source Standard
palettes Playback function
Storage Internal storage External storage Data storage format
Video length Digital export
Detail
128 channels MEMS microphone 2 kHz 48 kHz User adjustable, 0.5 dB to 12 dB
25.7 132.5 dBA User adjustable, minimum test bandwidth 1 kHz 24 bit
Horizontal: 62° Vertical: 48° At least 25 FPS 0.3 m 120 m 1 m 7 bar 0.37
ml/s 10 m 7 bar 0.7 ml/s
Horizontal: 62° Vertical: 48° 3.04 mm fixed focal length 8 million pixel
Specifications
1024 x 600 pixels 7 inch Capacitive touch screen Adjustable Up to 5 photos notes for reference Show single or multiple sources 3: Grayscale, Ironbow, Rainbow View photos, videos anytime, and add notes or tags
Up to 8 Gb MicroSD card, USB-C memory stick, at least 64 Gb, expandable to 256 Gb .jpg Picture, .mp4 Video .wav Recording 5 minutes MicroSD card, USB-C memory stick
www.megger.com
MPAC128 and MPAC128-ATEX 29
Specifications Power Battery capacity Battery life Charger
Power consumption
Energy management
Interface USB 3.0 Type-C USB host port 3.5 mm headphone socket
Operating Environment Operating environment Storage temperature Charging
temperature
General Specification Ingress Protection (IP) Size Weight Warranty Self-
diagnostic notification
System Certification Supported Language
Software Report types Analysis
1×6600 mAH @ 7.2 V Rechargeable battery ~ 4 hours under full load state USB
Type-C port, USB Power Delivery (USB PD) protocol supported, 15 W 15 W for
battery charge 29 W for maximum power consumption Sleep/Auto power off modes
-20 ºC to +50 ºC, 10% to 95% no condensation -20 ºC to +60 ºC 10 ºC to +45 ºC
IP54 272 mm × 174 mm × 42 mm 1.7 kg 2 years Array-health test function to
identify when microphone array needs attention Linux system CE, FCC, RoHS-
compliant, MSDS, CNEX, ATEX-II 3 G Ex ic IIC T5 Gc English, Dutch, French,
Chinese, German, Hungarian, Italian, Japanese, Korean, Norwegian, Polish,
Portuguese, Russian, Spanish, Swedish
Gas/Electricity, ISO 50001 compliant Waveform, spectrum, spectrogram, leakage
assessment, discharge type discrimination
30 MPAC128 and MPAC128-ATEX
www.megger.com
9. Accessories and equipment
9.1 Included accessories
Item Hand straps Shoulder strap Universal mains charger USB-C charge cable
Headphones Hard protective carry case 8 Gb microSD card USB-A microSD card
reader 8 Gb USB-C/USB-A memory stick Cleaning tool
Accessories and equipment
www.megger.com
MPAC128 and MPAC128-ATEX 31
Terminology
10. Terminology
USB Power Delivery (USB PD)
Decibel (dB)
Sound Pressure Level (SPL)
Audible domain
Ultrasonic
A power delivery protocol based on USB3.1, which is often used to transmit
higher power using a USB interface.
A ratio used to express the magnitude of sound waves compared to a reference
level at 0 dB.
A physical quantity used to express the magnitude of sound waves, in decibels
(dB). Also expressed as dBSPL.
The frequency range of sound that can be perceived by human ears normally 20
Hz to 20 kHz.
Frequencies higher than the human ear can perceive, normally >20 kHz.
Sound image Palette
The two-dimensional data table representing the intensity distribution of
sound sources in the space plane after the signal collected by microphone
array is calculated by the sound source location algorithm.
The colour data used in the colour mapping of a sound cloud chart.
Sound cloud image Test frequency range Frequency peak
The sound pressure level data of each resolution point on the sound image is
mapped on the palette (according to a conversion formula) to form a colour
image, which is superimposed over the visible image to form a sound cloud
image.
When a defined frequency range is selected within the full frequency range
supported by the device, the device will measure and display a sound cloud
image/sound map that is within the defined range. Sound outside this frequency
range will not be displayed.
Denotes a strong sound energy distribution at a particular frequency.
Dynamic range Field of view
The scale of the intensity of the sound source that can be shown on the sound
cloud image/sound map.
For the camera and the microphone array, the solid angles subtended by the
edges of their respective images to the face of the instrument.
32 MPAC128 and MPAC128-ATEX
www.megger.com
Calibration, repair and warranty
11. Calibration, repair and warranty
Warranty Period: Two years from the date of purchase.
Megger operate fully traceable calibration and repair facilities to make sure
your instrument continues to provide the high standard of performance and
workmanship that is expected. These facilities are complemented by a worldwide
network of approved repair and calibration companies, which offer excellent
in-service care for your Megger products.
Within two years from the date of purchase, we provide free warranty service
for abnormal, and malfunction caused by product quality. Free warranty service
does not include the non-product quality problems caused by improper use,
accidental drop, etc.
In case of equipment failure caused by improper use or accidental drop, we
promise to provide maintenance service at cost price.
The equipment has been calibrated when delivered to the user. However, in the
long-term use process, we suggest that you send the equipment to our office
every two years for equipment calibration, testing and maintenance.
For service requirements for Megger instruments contact:
Megger Limited Archcliffe Road Dover Kent CT17 9EN U.K. Tel: +44 (0) 1304 502
243 Fax: +44 (0) 1304 207 342
11.1 Return procedure
WARNING : DO NOT remove the battery cells before shipping this instrument. The
MPAC can only be shipped via land or sea freight with the Lithium-ion
batteries installed. The MPAC cannot be shipped by air freight. Faulty battery
modules MUST NOT be shipped to Megger or anywhere else.
1. When an instrument requires recalibration, or in the event of a repair
being necessary, a Returns Authorisation (RA) number must first be obtained
from one of the addresses shown above. The following information is to be
provided to enable the Service Department to prepare in advance for receipt of
your instrument and to provide the best possible service to you:
Model (for example, MPAC128).
Serial number (found on the display in the system/about menu, on the
instrument label or on the calibration certificate).
Reason for return (for example, calibration required, or repair).
Details of the fault if the instrument is to be repaired.
2. Make a note of the RA number. A returns label can be emailed or faxed to
you if required.
3. Pack the instrument carefully to prevent damage in transit. Use the
original carry case if possible.
4. Before the instrument is sent to Megger, freight paid, make sure that the
returns label is attached or that the RA number is clearly marked on the
outside of the package and on any correspondence. Copies of the original
purchase invoice and packing note should be sent simultaneously by airmail to
expedite clearance through customs. In the case of instruments which require
repair outside the warranty period, an immediate quotation can be provided
when obtaining the RA number.
5. Track the progress on line at www.megger.com.
www.megger.com
MPAC128 and MPAC128-ATEX 33
Decommissioning
12. Decommissioning
12.1 WEEE directive
The crossed out wheeled bin symbol placed on Megger products is a reminder not
to dispose of the product at the end of its life with general waste. Megger is
registered in the UK as a Producer of Electrical and Electronic Equipment. The
Registration number is WEE/ HE0146QT. For further information about disposal
of the product consult your local Megger company or distributor or visit your
local Megger website.
12.2 Battery disposal
The crossed out wheeled bin symbol placed on a battery is a reminder not to
dispose of batteries with general waste when they reach the end of their
usable life. For disposal of batteries in other parts of the EU contact your
local Megger branch or distributor. Megger is registered in the UK as a
producer of batteries (Registration number: BPRN00142). For further
information see www.megger.com.
34 MPAC128 and MPAC128-ATEX
www.megger.com
13. Worldwide sales offices
Sales Office UK
Telephone T. +44 (0)1 304 502101
USA Dallas
T. +1 214 333 3201
USA Valley Forge
T. +1 214 333 3201
USA Dallas
T. +1 214 333 3201
DEUTSCHLAND Aachen
T. +49 (0) 241 91380 500
SVERIGE
T. +46 08 510 195 00
AUSTRALIA
T. + 61 2 9397 5900
– CESKÁ REPUBLIKA AMÉRICA LATINA
T. +86 512 6556 7262 T. +852 26189964 T. +420 222 520 508 T. +1 214 330 3293
ESPAÑA SUOMI LA FRANCE
T. +34 916 16 54 96 T. +358 08 510 195 00 T. +01 30 16 08 90
MAGYARORSZÁG ITALIA
T. +49 (0) 9544 68 0 T. +36 1 214-2512 T. +49 (0) 9544 68 0
T. +44 (0)1 304 502101
NEDERLAND NORGE
T. +1-800-723-2861 T. +966 55 111 6836 T. +973 17440620 T. +46 08 510 195 00 T. +46 08 510 195 00
POLSKA PORTUGAL ROMÂNIA
T. +48 22 2809 808 T. +34 916 16 54 96 T. +40 21 2309138
SLOVENSKO SOUTH AFRICA TÜRKIYE
T. +7 495 2 34 91 61 T. +421 2 554 23 958 T. + 27 (031) 576 0360 T. +46 08 510 195 00
www.megger.com
Worldwide sales offices
Email E. UKsales@megger.com E. USsales@megger.com E. USsales@megger.com E.
USsales@megger.com E. info@megger.de E. seinfo@megger.com
E. meggerchina@megger.com E. meggerchina@megger.com E. info.cz@megger.com E.
csasales@megger.com E. info.es@megger.com E. seinfo@megger.com E.
infos@megger.com E. sales@sebakmt.com E. info@megger.hu E. sales@sebakmt.com
E. UKsales@megger.com E. sales@megger.com E. MEsales@megger.com E.
MEsales@megger.com E. seinfo@megger.com E. seinfo@megger.com E.
info.pl@megger.com E. info.es@megger.com E. info.ro@megger.com E.
sebaso@sebaspectrum.ru E. info.sk@megger.com E. sales.rsa@megger.com E.
seinfo@megger.com
MPAC128 and MPAC128-ATEX 35
Local Sales office
Megger Limited Archcliffe Road Dover Kent CT17 9EN ENGLAND T. +44 (0)1 304
502101 F. +44 (0)1 304 207342
Manufacturing sites
Megger Limited Dover, ENGLAND T. +44 (0)1 304 502101 E. uksales@megger.com
Megger Valley Forge Phoenixville, PA USA T. +1 610 676 8500 E.
USsales@megger.com
Megger GmbH Aachen, GERMANY T. +49 (0) 241 91380 500 E. info@megger.de
Megger AB Danderyd, SWEDEN T. +46 08 510 195 00 E. seinfo@megger.com
Megger USA – Dallas Dallas, TX USA T. +1 214 333 3201 E. USsales@megger.com
Megger Germany GmbH Baunach, GERMANY T. +49 (0) 9544 68 – 0 E.
baunach@megger.com
Megger USA – Fort Collins Fort Collins, CO USA T. +1 970 282 1200
Megger Germany GmbH Radeburg, GERMANY T. +49 (0) 35208 84-0 E.
radeburg@megger.com
This instrument is manufactured in China. The company reserves the right to change the specification or design without prior notice. Megger is a registered trademark. The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG Inc., and are used under licence.
MPAC128_UG_en_V02 05 2024 © Megger Limited 2024
www.megger.com
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>