Iriss Sonus PD Pro User manual

Sonus PD Pro
Operating Manual

22020 Sonus PD Alert Operating Manual
Contents
The Sonus PD Pro� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
Partial Discharge � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
Radiated Energy 6
Electromagnetic Radiation 7
Acoustic Radiation 7
Physical Dimensions of Sonus PD Pro � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 7
Dimensions 7
Weight 7
Power Supply 7
Temperature 7
Relative Humidity 7
IP Rating 8
CE Compliance � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8
The Sonus PD Pro Kit List � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8
General Substation Safety Precautions � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 8
Access 9
Visual Inspection of Substation 9
Environmental Protection � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
The Sonus PD Pro Overview � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
The Sonus PD Pro Outline 9
Sonus PD Pro Input/Output 10
Transient Earth Voltage (TEV)� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 10
Capacitive Coupler Sensor 11
Specication 11

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2020 Sonus PD Alert Operating Manual
Acoustic Emission (AE) � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 11
Surface Tracking 11
Acoustic Sensor 11
Specication 11
Operational Control � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 12
Control Buttons 12
Power 12
Battery level 12
Operating Modes 12
Mode Selection 12
TEV Mode 13
TEV Noise Detection 13
AE Mode 13
HFCT Mode 14
PD Detection Using HFCT 14
UHF Mode 15
PD Detection Using UHF Sensor 16
Display � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 16
Level Display 16
Live PRPD Display 17
Synchronisation 17
Persistent PRPD Mode 17
Sonus PD Pro App 18
Synchronisation Indication 18
Check Sonus PD Pro Function� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 19
Function Tester 19

42020 Sonus PD Alert Operating Manual
Check The TEV Function 19
Check The AE Function 20
Surveying Switchgear Panels for PD - TEV � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 21
Step 1- Check TEV Activity Levels 21
Example 1 – Component Switchgear 21
Example 2 – Fully Enclosed Switchgear 22
Step 2 – Verify Whether Detected Activity is Noise or PD 22
Surveying Switchgear Panels for PD - Acoustic � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 22
Step 1- Check Acoustic Activity Levels 22
Appendix A: The Relationship Between PD and Criticality � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 24
Criticality 24
Partial Discharge 24

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2020 Sonus PD Alert Operating Manual
IRISS Inc.
10306 Technology Terrace
Bradenton, FL 34211
Phone: [phone]
E-mail: [email protected]
Web: www.iriss.com
© 2021 IRISS Inc. All rights reserved
The contents of this manual are copyrighted property. Duplication and distribution in any form, particularly reprinting,
photographic, mechanical or electronic reproduction, or in the form of storage in data processing systems or data networks, is
prohibited without the consent of the copyright holder.
Revision:1.0,Date:01-01-2021Subjecttotechnicalmodications!

62020 Sonus PD Alert Operating Manual
The Sonus PD Pro
Partial Discharge
Partial Discharge (PD) is an electrical discharge that does not completely bridge the space between two conducting electrodes. The
dischargemaybeinagaslledvoidinasolidinsulatingmaterial,inagasbubbleinaliquidinsulatororaroundanelectrodeinagas.
When partial discharge occurs in a gas, it is usually known as corona.
Partial discharge is generally accepted as the predominant cause of long-term degradation and eventual failure of electrical
insulation.Asaresult,itsmeasurementisstandardaspartofthefactorytestingofmosttypesofhighvoltageequipment.In-service
monitoringofequipmentforPDgivesanadvancewarningofpendinginsulationfailure.Thisallowsaplantoperatortotakeremedial
action during planned outages.
Partial discharge often occurs under normal working conditions, gradually deteriorating the dielectric until it can no longer withstand
theelectricalstressandfails.BydetectingthisPDactivitywhiletheequipmentisinoperation,failurecanbeavoided.
The Sonus PD Pro is a partial discharge (PD) detection instrument
designed for use both in distribution voltage substations and
EHV Switchyards. It enables Network Operators to carry out
routine tests that will identify discharge activity in switchgear
(AIS and GIS), cables and high voltage accessories.
The battery-powered portable device has a live display that
shows a quantied level of PD activity. A colour-coded trafc
light system indicates when detected levels exceed the pre-
set thresholds. The Sonus PD Pro has a built-in TEV sensor for
the detection of internal discharge in switchgear and a built-
in ultrasonic sensor for detection of surface discharge and
tracking.
The Sonus PD Pro also supports external HFCT Sensors for
detection of cable PD and UHF sensors for detection of PD in
GIS and EHV termination.
Headphones are also supplied to help the user when working in
noisy environments.
The Sonus PD Pro is supplied with a battery-operated Function
Tester that should be used to verify the correct operation of the
instrument before use.
The Sonus PD Pro is a non-intrusive test device, therefore, PD
canbeidentiedandlocatedwhilsttheequipmentremainslive.
A PD event will radiate energy in different forms and this energy can be picked up and measured by the Sonus PD Pro.
Radiated Energy

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2020 Sonus PD Alert Operating Manual
PD creates EM radiation that dissipates in all directions away from the source. Metal components, for instance, the panels around
switchgear, will pick up this radiation and small voltages called Transient Earth Voltages (TEVs) are induced on the surface. These
veryhigh-frequencysignalswillbepickedupbytheSonusPDProandindicatethatthereisaPDsourcenearby.
Electromagnetic Radiation
PartialDischargealsogeneratesacousticenergyacrossawidebandoffrequencies.Thisacousticenergycanbedetectedinthe
ultrasonic range when there is a ‘line of sight’ between the PD source and the detecting sensor. Sharp points, for instance on air-
insulated cable terminations, are typical sources of discharge that will produce acoustic emission. Cast insulators are prone to
surface tracking, particularly when dirty or wet, where electrical stress across the insulator’s surface causes discharge, and
deterioratestheinsulatorsurfaceandcreatescarbontracks.Thiscanleadtoashoverandfailureoftheequipment.
Acoustic Radiation
Physical Dimensions of Sonus PD Pro
Dimensions
The Sonus PD Pro has the following external dimensions excluding attachments and aerials:
• Width: 190 mm
• Height: 90 mm
• Depth: 65 mm
The Sonus PD Pro weighs 220g.
Weight
The Sonus PD Pro has a built-in Lithium-Ion battery allowing for long battery life. A battery charger and car charger are included in
the kit.
Power Supply
Test Situation Est. Battery Life
Sonus PD Pro Only 8 hours
Sonus PD Pro with App 6 hours
Table 1: Battery Life Estimate
Temperature
The Sonus PD Pro can be used in the following temperature ranges:
• Operation: -20°C to +60°C
• Storage: -20°C to +75°C
Relative Humidity
The Sonus PD Pro can be installed in the following relative humidity ranges:
• Operation: 0% to 95%

82020 Sonus PD Alert Operating Manual
IP Rating
The Sonus PD Pro is IP54 rated but is not intended for use in damp conditions.
CE Compliance
The Sonus PD Pro complies with the following directives:
EN 61000-6-2: 2005 IMMUNITY STANDARD (INDUSTRIAL ENVIRONMENT)
EN 61000-6-3: 2007 EMISSION STANDARD (RESIDENTIAL, COMMERCIAL and LIGHT INDUSTRY ENVIRONMENT)
The Sonus PD Pro Kit List
The Sonus PD Pro Kit includes:
• 1x Sonus PD Pro
• 1x Sonus PD Pro power supply/
charger unit
• 1x USB Charger Cable
• 1x Car Charging Adapter
• 1x Stereo Headphone with 3.5mm
Jack
• 1x PD-FT Function Tester
• 1x Moulded carry case
• 1x Sonus PD Pro Companion App
Manual
General Substation Safety Precautions
Before setting up the Sonus PD Pro in the substation it is important for the user to read and understand the
following general safety information.
The engineer should obey the plant owner’s High Voltage safety rules at all times. The following safety rules
whichareparticulartotheSonusPDProequipmentshouldbeappliedinadditiontotheexistingsafetyrules,
whicharerequiredbytheplantowner.GeneralsafetyrulesfortheuseoftheSonusPDProareasfollows:
1. Avoid working alone.
2. OnlyaccreditedpersonnelwithappropriateHealthandSafetyTrainingshouldusetheequipment.
3. Donotusetheequipmentifitisdamaged,oritssafetyisimpairedinanyway.
4. TheUsershouldhavereadandunderstoodtheappropriateequipmentmanuals.
5. Always select the appropriate sensor and sensor connection for the application.
6. Theinstrumenthasbeendesignedforuseonlyontheearthed,outersurfacesofmetal-cladequipmentandearthedconnections
of cables/switchgear. The Sonus PD Pro or PD sensors should never be connected to, or put near, any high voltage components.
7. Never disconnect or loosen an earth connection in order to install a PD sensor
8. Cables connecting PD sensors to the instrument do not provide protection against high voltage.
9. Always maintain Safety Distances between the instrument, PD sensors, the operator, and any high voltage components.
10. Donotdisturborinterferewiththehighvoltageequipmentinanyway.
11. The User should wear sensible and appropriate PPE and clothing when in the substation.
Optional sensors supplied separately
• 1x HFCT sensor for Cable PD
• 1x UHF sensor for GIS PD
• 1x Ultrasonic Parabolic Dish
• 1x AA Ultrasonic Probe
Figure 1: PD Detector kit

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2020 Sonus PD Alert Operating Manual
Access
The Test Engineer shall only enter the customer’s switchyard or substation after they have received permission from an Authorised
Personappointedbytheplantownerandhavetherelevanttrainingand/orcertication.
Visual Inspection of Substation
On entry to the test area, a visual inspection of the area should be carried outby the Test Engineer(s). This should enable the operator
toidentifyanypotentialhazardsintheareaandtoassessboththetypeofequipmenttobetestedandthemethodofdoingso,for
instance, Switchgear using CC or AA sensors or Cables using HFCT sensors. Only when this visual inspection has been completed
shouldtestequipmentbeused.
Environmental Protection
This product contains general electronic components that may be environmentally harmful if improperly
disposed of. Please use correct disposal methods in accordance with local regulations.
The device can be returned to IRISS at the end of use for proper disposal.
The Sonus PD Pro Overview
The Sonus PD Pro Outline
The Sonus PD Pro has a tough ABS enclosure with rubber
protective covering around the built in TEV and ultrasonic PD
sensors. Both built-in sensors are mounted at the front of the
instrument so that they can be easily directed at the inspection
point.
The Sonus PD Pro can also be used with external PD sensors.
The Sonus PD Pro is controlled with three membrane switches
on the front panel. When used in standalone mode, an OLED
screen displays both text and graphical information to the user.
When connected to a mobile device running the Sonus PD Pro
App, all information is displayed on the App. The Sonus PD Pro
also has an audio output through both a built-in speaker and
pluggable earphones.
The unit is powered by a lithium-ion battery giving a long life for
hours of use. The software has intelligent power management
prolonging battery life.

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Sonus PD Pro Input/Output
The Sonus PD Pro has inputs and outputs as detailed in the tables below:
Front Panel Type
Display OLED
Display 6 x PD level LEDs
Control button MODE Membrane switch
Control button DISPLAY SELECT Membrane switch
ON/OFF button Membrane switch
PD Detector Only
Earphone socket 3.5mm Jack
External AE sensor 3.5mm Jack
UHF/HFCT/Power charge port 2.1mm DC power
PD Detector Only
Bluetooth module Bluetooth 4.0 LE
Table 2: Sonus PD Pro Input/Output
Transient Earth Voltage (TEV)
Partial discharge activity inside a metal-clad high voltage plant induces small voltage impulses called Transient Earth Voltages on
thesurfaceofthemetalcladding.TheseTEVstravelaroundthecladdingsurfacetotheoutsideoftheequipmentwheretheycanbe
picked up using capacitively coupled transducers.
The TEV signals will not pass through the metal panels but instead emerge at the joins between the metal panels and it is at these
points that the highest readings are generally detected.
Figure 2: PD pulse propagation in AIS panels

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2020 Sonus PD Alert Operating Manual
Capacitive Coupler Sensor
ThebuiltinCapacitiveCouplersensordetectsTEVsastheypassoverthepanelsofthehighvoltageequipment.Theveryfast
transient signals are detected by the PD Detector and their magnitude measured and displayed.
Specication
FrequencyResponse 3MHz–400MHz
TEV detection range 0 – 80dB
Refertodedicatedspecicationdocumentforfullinformation
Acoustic Emission (AE)
Acoustic Emission is ultrasonic sound energy that is emitted by discharges on electrical insulating surfaces often caused by Surface
Tracking or Corona.
Surface Tracking
Surface Tracking is the formation of a permanent conducting path across an insulator surface. Usually the conduction path results
from degradation of the insulation. Tracking most readily occurs when the insulation is a carbon-based compound.
Ahighvoltageplantisoftenverydifculttoclean,sodirtandcontaminantscanbuildupovertime.Inthepresenceofmoisture,
these contaminating layers give rise to leakage current over the insulator surface. This heats the surface and through evaporation
causesinterruptioninthemoisturelm.Largepotentialdifferencesaregeneratedoverthegapsinthemoisturelmandsmall
sparks can bridge the gaps. Heat from the sparks causes carbonisation of the insulation and leads to the formation of permanent
carbontracksonthesurface.Undersuchconditionsthisprocesswilldevelopovertimeandeventuallyleadtoashoverandfull
breakdown of the insulation.
Acoustic Sensor
The ultrasonic acoustic Sensor is designed for use on air insulated terminations where there is a clear sound path between the
electrically stressed insulation and the probe. The sensor is extremely sensitive when pointed directly at the
discharge source.
The transducer is embedded into the rubber moulded cover at the front of the instrument so it can be easily directed towards the
parts of electrical plant where tracking may occur.
Specication
Frequencyresponse 40KHz±1KHz
Detectionrange -6dBμVto70dBμV
Refertodedicatedspecicationdocumentforfullinformation

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Operational Control
Control Buttons
The Sonus PD Pro is controlled by three buttons on the instrument as shown in Figure 4.
Figure 4: Instrument control buttons
The POWER button is used to turn the Sonus PD Pro ON and OFF. By pressing the button once the instrument
will toggle between these states.
Note: that the POWER button should be pressed and held down for two seconds before the power is switched.
Power
The remaining charge in the battery is indicated by the small icon in the bottom right-hand side of the display screen.
Battery level
The Sonus PD Pro can be set-up to operate in 2-channel mode or in 4-channel mode. If the Sonus PD Pro will be used with either
of the external PD sensors, HFCT or a UHF PD sensor, then it should be set to 4-channel mode. If the Sonus PD Pro is only going
to be used with the built in TEV and ultrasonic sensors, then it should be set to 2-channel mode. The Sonus PD Pro can be toggled
between 2-channel mode and 4-channel mode by using the Sonus PD Pro App. The option to change this is in Settings.
Operating Modes
The MODE button is used to toggle the instrument between the different sensors. In 2-channel mode, pressing
the MODE button will switch the instrument between the TEV and AE. In 4-channel mode, pressing the MODE
button will switch the instrument between TEV, AE, HFCT and UHF.
Mode Selection
POWER button
DISPLAY SELECT
button
MODE button

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2020 Sonus PD Alert Operating Manual
In TEV Mode the instrument measures and displays the magnitude of TEV signals detected. The measured value is shown in dBmV
such that 0dB = 1mV. The relationship between the detected signal magnitude in dB and mV is shown in the Table 3.
TEV Mode
mV dB
1 0
2 6
5 14
10 20
20 26
35 31
50 34
100 40
1,000 60
10,000 80
Table 3: Relationship between mV and dB for TEV signals
In TEV Mode, the Sonus PD Pro will detect HF signals that are from both PD sources and from noise sources. An algorithm processes
the detected signals and distinguishes between the PD and noise so that the level of each can be shown separately. The magnitude
of pulses recognised as PD are displayed in large text in the centre of the screen in dB. The magnitude of pulses recognised as noise
are displayed on the right-hand side of the screen in dB as shown in Figure 5
TEV Noise Detection
Figure 5: PD & Noise indication
It should be noted that when high levels of noise are detected, it can mask genuine PD. It is advisable to use more sophisticated PD
detection instruments that can detect PD even in the presence of high noise. A level bar on the left-hand side of the screen gives a
graphical indication of magnitude of the PD detected.
In AE Mode the instrument measures and displays the magnitude of ultrasonic acoustic signals detected. The measured value is
shownindBμVsuchthat0dB=1μV.TherelationshipbetweenthedetectedsignalmagnitudeindBandmVisshowninthetable
below.
AE Mode

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µV dB
0.5 -6
1 0
2 6
5 14
10 20
20 26
35 31
50 34
100 40
1,000 60
3,100 70
Table4:RelationshipbetweenμVanddBforAEsignals
The magnitude of detected ultrasonic activity is displayed in large text in the centre of the screen in dB as shown in Figure 6
Figure 6: Ultrasonic indication
Figure 7: PD Detector connected to the HFCT
ForthedetectionofPDincables,theSonusPDProcanbeusedwithaHighFrequencyCurrentTransformer,HFCT.TheHFCTis
connected to the instrument using the BNC-2.1mm Jack cable as shown in Figure 7.
HFCT Mode
Partialdischargeincablesinducessmallhighfrequencycurrentsintheearthandthecablecore.Theseimpulsestravelalongthe
cable to the termination where they can be picked up using an HFCT. The HFCT sensor is hinged so it can be opened and put around
the cable earth or around the core if the earth is passing back thorough the HFCT as shown in Figure 8 and Figure 9
PD Detection Using HFCT

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2020 Sonus PD Alert Operating Manual
Figure 8: HFCT around earth Figure 9: HFCT around core and earth
In HFCT mode, the screen shows the measured signal in pico-Coulombs (pC) for values between 0-999pC and in nano-Coulombs
for values between 1-7nC as shown in Figure 10.
Figure 10: HFCT screen display
In HFCT Mode, the Sonus PD Pro will detect HF signals that are from both PD sources and from noise sources. An algorithm
processes the detected signals and distinguishes between the PD and noise so that the level of each can be shown separately.
The magnitude of pulses recognised as PD are displayed in large text in the centre of the screen in pC/nC. The magnitude of pulses
recognised as noise are displayed on the right-hand side of the screen in pC/nC.
IMPORTANT
The HFCT signal cable does not provide electrical isolation for the HFCT. The HFCT sensor should therefore never be placed near
tohighvoltagecomponents,itshouldonlyeverbeplacedaroundfullyearthedcomponents.Neverdisconnectacableearthtot
the HFCT sensor around it.
For the detection of PD in Gas Insulated Switchgear (GIS) the Sonus PD Pro can be used with a UHF PD Sensor. The UHF sensor
is connected to the instrument using the BNC-2.1mm Jack cable connected via the UHF power decoupler as shown in Figure 11.
UHF Mode
Figure 11: Sonus PD Pro connected to the UHF and power decoupler

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GIS is made from large steel tubes that effectively form a Faraday cage. This means
that when PD occurs inside the GIS, the high frequency electromagnetic pulses
propagate through the inside of the GIS until they come to a break in the conducting
shield and they can escape. By placing the UHF sensor up against the barrier insulators
that separate individual sections of GIS, internal PD can be detected.
In UHF Mode the instrument measures and displays the magnitude of UHF signals
detected. The measured value is shown in dBmV where 0dB = 1mV.
PD Detection Using UHF Sensor
Figure 12: PD in GIS
Display
The DISPLAY SELECT button is used to toggle between the different display modes. Each time the button
is pressed the screen display will change between the following screens in a loop: Level Display, Live PRPD
Display and Persistent PRPD Display.
Display Selection
This is the default display and shows the real-time signal levels measured in dB as a single number, see example in Figure 13.
Level Display
The Green and Amber LEDs illuminated
indicate Medium activity
Colored LEDs on either side of the display indicate whether the detected PD activity is Low, Medium or High. Thresholds for TEV
measurements are set according to the levels shown in the table below;
Figure 13: Level Display

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2020 Sonus PD Alert Operating Manual
Sensor LOW MEDIUM HIGH
TEV <=19dB 20 - 29dB >=30dB
AE <=5dB N/A >=6dB
HFCT <=99pC 100-499dB >=500pC
UHF <=39dB 40-54dB >=54dB
Live PRPD Display shows the activity detected phase resolved against the power cycle. The power cycle synchronisation is picked
upfromthebuilt-inelddetector.ThistypeofdisplayisoftencalledPhaseResolvedPartialDischarge(PRPD).
Live PRPD Display
Figure 14: AE and TEV Live PRPD Mode
In the Live PRPD Mode, the X axis represents time and is calibrated to represent one power cycle. Therefore, when used on a 50Hz
system it shows 20ms and on a 60Hz system it shows 16.67ms. The Y axis represents the magnitude of each detected PD pulse.
InordertodisplaythePRPDintimesynchronisationwiththeHVpowercycle,aninternalelddetectorisusedtopickuptheeld
generated by the high voltage.
When this signal has been correctly detected a Sine Wave symbol appears in on the screen next to the level reading. If the instrument
has not picked up the synchronisation signal, the Sine Wave symbol will not appear.
Synchronisation
The third mode under each sensor displays PRPD in a persistent mode. In the ‘live’ display the data is shown as a bar chart and in
the persistent display it is represented as a scatter plot.
Persistent PRPD Mode
Figure 15: Examples of Persistent PRPD Display
The persistent display is cumulative and shows all activity detected from the point at which this mode is selected. In order to clear
and re-start the cumulative display, cycle through the modes until the user is returned to the correct persistent display.

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The Sonus PD Pro can be connected via Bluetooth to a smart mobile device running the
IRISS Sonus PD Pro App. The App compatible with Android devices is available from
Google Play Store, and the App compatible with iOS devices is available from Apple
App Store.
The Sonus PD Pro will automatically connect to a smartphone once it receives a
BluetoothconnectionrequestfromtheSonusPDProApp.Theusercantakeandstore
readings in real-time.
Once the Instruments and App have been paired, the Sonus PD Pro will display only
a Bluetooth Symbol and all reading and monitoring functionality will transfer to the
Sonus PD Pro App. For further information please refer to the Sonus PD Pro App User
Manual
Sonus PD Pro App
Figure 16: Sonus PD Pro App
Synchronisation Indication
Not Synchronised Synchronised
Figure 17: Synchronisation indication
When the Sonus PD Pro is connected to a mobile device, the synchronisation status is indicated both on the screen and on the LEDs.
The Green LEDs indicate that the instrument has synchronised, and the red LEDs indicate that it is not synchronised.

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Check Sonus PD Pro Function
Before carrying out any test work with the Sonus PD Pro it should be tested to check it is operating correctly.
Function Tester
Figure 18: PD-FT
The Function Checker PD-FT is a small batteryoperated test device for checking the
correct performance of the PD Detector. When the switch is pressed it generates both
TEV signal and AE signal.
The Function Checker PD-FT is a small batteryoperated test device for checking the
correct performance of the Sonus PD Pro. When the switch is pressed it generates both
TEV signal and AE signal.
The PD-FT should only be used for checking functionality and not calibration. The
output of the PD-FT is not calibrated and may vary.
ThePD-FTisbatteryoperated.Whenthebatterylevelislow,thePowerLEDwillash.
The Sonus PD Pro charger can be used to recharge the battery. Whilst charging, the
LED will be bright and when fully charged the LED will return to normal intensity.
Hold the PD-FT up against the sensor head of the Sonus PD Pro and press the yellow button as shown in Figure 19. The bottom
surface of the PD-FT should be held directly against the sensor head. The Sonus PD Pro should record a signal level value of greater
than30dBtoconrmcorrectoperation.ThismayberecordedasPDornoise.
Check The TEV Function
Figure 19: Testing TEV function with PD-FT

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Hold the PD-FT up against the sensor head of the Sonus PD Pro and press the yellow button as shown in Figure 20. The AE sensor
end of the PD-FT should be held up against the sensor head using the two rubber extensions to regulate the distance between the
PD-FT and the Sonus PD Pro as shown in the picture.
TheSonusPDProshouldrecordavalueofgreaterthan30dBtoconrmcorrectoperation.
Check The AE Function
Figure 20: Testing AE function with PD-FT