Epoch XT

EPOCH XT: The Complete Ultrasonic Flaw Detector

The EPOCH XT is an advanced, portable ultrasonic flaw detector offering many standard measurement features including a tunable square wave pulser, selectable narrow-band and broad-band digital filters, gain range from 0 to 110 dB, peak memory and peak hold, and adjustable PRF.

The EPOCH XT Ultrasonic Flaw Detector is designed for great inspection flexibility and for use in extreme environments. It combines a multitude of enhanced flaw detection and measurement features, a bright multi-color LCD, versatile battery options, powerful data management, and numerous software features in a compact unit with a sealed case designed to meet IP67 requirements.


  • EN 12668-1 compliant
  • Tested for Explosive Atmoshpere, Vibration and Shock
  • IP67. Designed to meet IP67 requirements. Sealed to withstand harsh environments
  • Dynamic DAC/TVG Standard
    • Dynamic DAC curves
    • Custom warning levels
    • Meets ASME and JIS requirements
    • Advanced TVG Table allows customized TVG setups
  • Multiple Battery Options – can be used with Lithium Ion, NiMH, or C-Cells
  • Host USB Port for direct printing and storage to USB drives
  • Client USB Port for PC communication
  • “PerfectSquare™ Technology”: Pulse is electronically controlled on both the leading and trailing edges to maximize transducer performance and near surface resolution.
  • PRF adjustable from 10 Hz to 1 kHz in 10 Hz increments.
  • All measurements are taken “single shot”.
  • Powerful alphanumeric datalogger
    • Corrosion thickness gage file types can be set up onboard
    • Simple incremental files
  • Multi-color LCD display
  • Lightweight – 4.7 lbs (2.1 kg)

Loaded with Practical Measurement Features

The EPOCH XT incorporates many standard measurement features including a tunable square wave pulser, selectable narrow-band and broad-band digital filters, gain range from 0 to 110 dB, peak memory and peak hold, adjustable PRF, 0.001 in. (0.01 mm) measurement resolution, and two gates with programmable alarms. In addition, the unit offers many standard and optional application-specific software features: Dynamic DAC/TVG (Distance Amplitude Correction/ Time Varied Gain), On-board DGS/AVG, AWS D1.1 & D1.5, Curved Surface Correction, and GageView Pro.

  • Standard tunable Square Wave pulser with PerfectSquare™ Technology allows the operator to adjust pulse width to maximize transducer performance
  • Standard digital receiver filtering-broadband, several narrow band settings, and a high-pass setting.
  • Five measurement displays that are fully customizable to meet inspection needs. Select any Gate 1 or Gate 2 measurement for each display box
  • Amplitude measurement resolution of 0.25% full screen height
  • Amplitude measurement from 0% to 110% full screen height
  • Gate measurement modes: Peak, Edge and NEW First Peak Mode for thickness measurement applications
  • Measurement rate adjustable from
  • 10 Hz to 1000 Hz in 10 Hz increments on live screen
  • Peak Mem and Peak Hold functions in all rectified modes. Peak Hold also functions in RF mode
  • New Grid Display Modes
    • Standard 1-10
    • Soundpath
    • Leg mode for angle beam inspection
    • Selectable 100% or 110% vertical display
  • Leg indicator and measurement mode indicator for each gate
  • Alarm indicator for each gate

New Direct-Acess Keypad

  • Logical color-coded key organization
  • Direct access to important instrument set-up parameters.
  • Direct entry of alphanumeric characters
  • Five customizable function keys allow the operator to quickly select preset values
  • Available in English, International Symbols, Japanese or Chinese

Multiple Battery Options

The EPOCH XT offers three battery options that provide long-lasting battery operating time depending on display brightness and battery selection.

  • Internal, rechargeable: NiMH, Lithium ion or Alkaline C-cells
  • Optional external “smart” battery charger

Built for Tough Environments

The rugged EPOCH XT is designed to meet the requirements of IP67. The instrument can withstand the rigors of field operation in harsh environments from offshore to deserts.

  • Designed to meet IP67 environmental seal requirements
  • Approved for Explosive Atmosphere per MIL-STD-810F, Procedure 1, NFPA 70E, Section 500, Class 1, Div. 2, Group D
  • Shock tested per IEC 60068-2-27, 60g’s, 6msec H.S., 3 axes, 18 total
  • Vibration Tested – Sine Vibration per IEC 60068-2-6, 50-150 Hz @ .03″ DA or 2g’s, 20 sweep cycles
  • Wide operating temperature ranges:
    • Lithium Ion: -10° to 50°C (14° to 122°F)
    • Nickel Metal Hydride: 0° to 50°C (32° to 122°F)
    • Alkaline: -10° to 50°C (14° to 122°F)
    • Recharge temperature: 0 to 40°C (32° to 122°F)
  • Hand strap can be mounted for left or right hand operation
  • Easy-to-use rubberized Pipe Stand that can be folded in or removed
  • Durable instrument-mounted D-rings for chest harness use
  • Sealed battery compartment-no tools required for battery replacement
  • Sealed I/O door for AC adaptor and USB connections

Extensive Documentation and Data Management Capabilities

GageView Pro

The optional GageView Pro Interface Program helps manage and format stored inspection data. Data can be printed or easily copied and pasted into word processing files and spreadsheets for further reporting needs. The GageView Pro Interface Program also allows the creation of a customized database of identifier (ID) strings that can be uploaded to the EPOCH XT. New features include remote display of live EPOCH XT screen on a PC, live screen capture mode, database backup/restore, and multi-view windows. The Interface Program is fully compatible with the EPOCH 4, 4B, 4PLUS, LT, and XT.

  • Export thickness or amplitude data saved on the Epoch to Excel, Word, or similar programs
  • Create, format, and manage test databases
  • Import real-time screen snapshots
  • View the live instrument display on a PC with Remote Display
  • Import and export setups between the Epoch and a PC
  • Create a custom DGS probe library
  • Upgrade EPOCH operating software dual usb ports
  • USB Host Port to interface directly to printers with USB ports and back up critical inspection data to USB drives
  • USB Client Port for high-speed data transfer to computer
  • USB connections and AC input adaptors are sealed behind a thumb-screw accessible door

Hardware input/output port option

  • Optional 16 Pin HW I/O Port
    • Alarm outputs
    • Trigger Input/Output
  • 16 Pin I/O cable available
    • PN: EPXT-C-16HW-6 (6 feet)
    • PN: EPXT-C-16HW-20 (20 feet)

Data Logger and Documentation

The EPOCH XT’s sophisticated datalogger is designed for ease of use while providing a wide range of features for many flaw detection and thickness gaging applications. Employing both EPOCH 4 series and the Panametrics corrosion thickness gage technologies, the EPOCH XT is ready to meet your inspection and thickness measurement survey requirements.
File types to meet your needs:

  • EPOCH 4 type files
  • Sequential
  • 2D, 2D EPRI
  • 2D custom point
  • 3D
  • Boiler

The EPOCH XT also offers onboard report generation. Operators may set up custom report headers and print directly from the instrument using the USB Host Port.

** The EPOCH XT has been designed to meet the requirements of IP67 to ensure that it is suitable for use in harsh environments. The customer replaceable instrument gaskets for the battery door and I/O access door must be properly maintained to ensure the effective sealing over the life of the product.

Olympus does not recommend that an EPOCH XT be submerged for any reason as it is not intended underwater use. Instruments that exhibit damage due to submersion will not be covered under the instrument’s limited warranty.

EN12668-1 Compliant
Weight: 4.7lbs (2.1kg) with Li Battery
Dimensions: 10.9″ H x 5.9″ W x 2″ D (at hand), 2.8″ (at display); 277 mm x 150 mm x 51 mm (at hand), 71 mm (at display)
Keypad: English, International, Japanese or Chinese
Languages: English, Spanish, French, German, Italian, Japanese, Chinese, Russian, Korean, Norwegian, Swedish.
Custom languages available.
Transducer Connections: BNC or Number 1 LEMO (BNC rated to IP67)
Battery: Choice of Lithium Ion, Nickel Metal Hydride, and Alkaline C-Cells
Battery Operating Time: Lithium Ion: 9-10 Hours, NiMH: 5 Hours, C-Cells: 1-2 Hours
Power Requirements: AC Mains: 100-120 VAC, 200-240 VAC, 50-60 Hz
Environmental Ratings
IP67 Designed to meet the requirements of Environmental Ingress Protection Rating**
Explosive Atmosphere approved per MIL-STD-810F, Procedure 1, NFPA 70E, Section 500, Class 1, Div. 2, Group D
Shock tested per IEC 60068-2-27, 60g’s, 6msec H.S., 3 axes, 18 total
Vibration Tested – Sine Vibration per IEC 60068-2-6, 50-150 Hz @ .03″ DA or 2g’s, 20 sweep cycles
Color Liquid Crystal display with 60 Hz update, user-selectable color schemes and brightness, and split screen and full screen modes.
Display Dimensions: 320 Pixels (W) x 240 Pixels (H) Color 4″ W (101 mm) x 3″ H (75 mm)
Baseline Break Mode: All zero cross points on the RF waveform are shown as zero points in Fullwave mode.
Amplitude Grid Modes: 100% or 110% Amplitude Display
Time Base Grid Modes: Standard 0 to 10 division, Soundpath Mode divides Range into 5 equal sections with grid lines, Leg Mode displays Soundpath Legs as grid lines


Tunable Square Wave Pulser
PRF: User Selectable or Auto from 10 Hz to 1000 Hz
Energy Settings: 50 to 475 V in 25 V increments
Pulse Width: Adjustable from 40 ns to 5,000 ns (0.1 MHz) with PerfectSquare™ Technology
Damping: 50, 63, 150, 400 Ohms
Gain: 0 to 110 dB

  • Two user-defined gain step adjustments and presets above function keys.
Total Instrument Bandwidth: 0.2

  • 26.5 MHz @ -3 dB
Digital Filter Settings:

  • 0.2
  • 10.0 MHz • 2.0
  • 21.5 MHz
  • 0.2
  • 1.2 MHz • 5.0
  • 15.0 MHz
  • 0.5
  • 4.0 MHz • 8.0
  • 26.5 MHz
  • 1.5
  • 8.5 MHz
Rectification: Full-wave, Positive Half-wave, Negative Half-wave, RF
System Linearity: Horizontal: +/

  • 0.5% FSW
Resolution: 0.25% FSH, Amplifier Accuracy +/

  • 1dB
Reject: 0 to 80% full screen height with visual warning
Automated Distance Calibration for Velocity and Zero Offset
Test Modes: Pulse Echo, Dual, or Through Transmission
Units: Millimeters, Inches, or Microseconds
Range: 0.073 to 527″ (1.86 to 13,400 mm)
Velocity: 0.025 to 0.6000 in/µsec (635 to 15240 m/S)
Zero Offset: 0 to 4950 µsec
Display Delay: -2.323″ to 500″ (-59 mm to 12700 mm)
Refracted Angle: 10° to 85° in 0.1° resolution
Types: Thickness, Soundpath, Projection, Depth, Amplitude, Time-Of-Flight for both Gate 1 and Gate 2.
Echo-To-Echo: Standard.
Five Measurement Display Locations: User selects up to five measurements from either gate to display on the live screen.
DAC/TVG Standard: Up to 50 points captured, ASME, ASME III, JIS, 80-20%, CUSTOM DAC, and TVG Table. 110dB Dynamic Range, 100dB per usec adjustment, full gain, range, and delay adjustments during setup, view switchable between DAC/TVG.
CUSTOM DAC with up to three warning curves from +10 dB to -24 dB
TVG Table setup for advanced Time Varied Gain applications. Also allows TVG setups to be built from DGS/AVG diagrams.
Amplitude Measurement: 0 to 110% full screen height with 0.25% resolution Curved Surface Correction for Angle Beam measurements standard X-Value Correction for distance from Beam Index Point to front of transducer.
Two Fully Independent Gates for Echo Height and Time-Of-Flight.
Gate Start: Variable over entire displayed range.
Gate Width: Variable from Gate Start to end of displayed range.
Gate Height: Variable from 2 to 95% Full Screen Height.
Alarms: Positive and Negative Thresholds; Minimum Depth on Gate 1 and Gate 2.
Zoom: Displayed Range is Gate 1 Width.
Instrument Inputs / Outputs
USB Client Port: For communication with GageView Pro
USB Host Port: Allows direct printing to any PCL5 compatible Laser or Inkjet printer as well as data storage on USB drives.
LEMO Hardware I/O (optional): Alarm Outputs, Trigger In/Out
Data Storage
Up to 10,000 IDs with Waveforms, Measurements, and Setup Parameters

Standard Inclusions

EPOCH XT Base Instrument Includes:

  • EP4/MCA: AC Adaptor
  • EPXT-TC: Transport Case
  • EPXT-MAN: Instrument Operating Manual
  • EPXT-HS: Bi-Directional Hand Strap
  • EPXT-PS: Rubber Coated Stainless Steel Pipe Stand
  • Lithium Ion or Nickel Metal Hydride Battery
  • Cap(s) for transducer connectors

Optional Accessories

  • EPXT-EC: External Smart Battery Charger
  • EP4/CH: Chest Harness
  • EPXT-RPC: Rubber Protective Case
  • EPXT-DP: Clear Display Protectors (10)
  • EPXT-C-16HW-6: 16 pin Hardware I/O cable with diagram
  • EPXT-HWIO-B, L: Hardware I/O option
  • EPXT-SEAL-KIT: Set of O-Rings and membrane

Software Options

  • AWS D1.1/D1.5 (PN: EPXT-AWS)

Software Options


Remote Activation
EPOCH series advanced software options remotely activated at any time after acquiring the instrument. There is no need to send the instrument back for updates.

Availability On Instrument
The availability for each option on the various EPOCH series instruments is defined using the following key:

Available/Optional Available/OptionalNot available Not availableStandard Standard
EPOCH Series
Software ModulesXT4+44BLT
API 5UEAvailable/OptionalAvailable/OptionalAvailable/OptionalAvailable/OptionalAvailable/Optional
Onboard DGS/AVGAvailable/OptionalAvailable/OptionalAvailable/Optional
Spotweld AssistantAvailable/OptionalNot availableNot available
Interface GateAvailable/OptionalNot availableNot available
High Pulse Repetition FrequencyAvailable/OptionalNot availableNot available
Low Pulse Repetition FrequencyAvailable/OptionalAvailable/OptionalAvailable/Optional
Floating GateAvailable/OptionalAvailable/OptionalNot availableNot available
Curved Surface CorrectionAvailable/OptionalNot availableAvailable/Optional
Spotweld OverlayAvailable/OptionalNot availableNot available
AutofreezeAvailable/OptionalNot availableNot available
Backwall AttenuatorAvailable/OptionalNot availableNot available
Wave AnalysisAvailable/OptionalNot availableNot available
Echo to EchoAvailable/OptionalStandardStandard
Narrowband FiltersAvailable/OptionalStandardNot available
Square Wave PulserAvailable/OptionalAvailable/OptionalStandard
Extended RangeAvailable/OptionalStandardStandard
Expanded MemoryAvailable/OptionalStandardStandard



API 5UE - The API 5UE software option for the EPOCH series is intended to assist with performing inspections in accordance with the American Petroleum Institute’s Recommended Practice 5UE. This practice was developed specifically for OCTG manufacturers to inspect and characterize inner-diameter (ID) cracking in newly fabricated pipe. The API 5UE code uses two crack sizing methods to characterize ID cracking: the Amplitude Comparison Technique (ACT) and the Amplitude-Distance Differential Technique (ADDT). The software aids in performing the ADDT method, which is based on the formula:

i=Amax(T 2-T 1)k

API 5UE inspections are accomplished using the Peak Memory function on the EPOCH 4 flaw detectors to draw a peak envelope of the crack signal and quickly capture the Amax, T1 and T2 points using a single key press. Using this collected data from the peak envelope, the EPOCH flaw detector performs the necessary calculation using the formula above and displays the crack height in the upper right corner of the screen.

The ADDT inspection method can also be performed using the API 5UE software in a manual mode, allowing the operator to manually select the values for Amax, T1 and T2. All API 5UE data can be easily stored using the EPOCH 4 series datalogger, and the full inspection data can be downloaded to a PC using the EPOCH 4 series interface program, GageView Pro.



AWS - The AWS D1.1/D1.5 software option for the EPOCH series is intended to assist with performing inspections covered under the American Welding Society D1.1 and D1.5 Structural Welding Code for steel. This code provides inspectors with a method to classify discontinuities found in welds using ultrasonic inspection. This code uses the following formula to develop an indication rating for a reflector found during an inspection:

A - B - C = D
A = Discontinuity Indication Level (dB)
B = Reference Indication Level (dB)
C = Attenuation Factor: 2 * (soundpath in inches – 1 inch) (dB)
D = Indication Rating (dB)

An AWS D1.1 inspector must take the Indication Rating (D) that is calculated based on A, B, and C to an Ultrasonic Acceptance – Rejection Criteria table produced by the AWS in order to classify the severity of the discontinuity that has been located.

AWS Indication Ratings are displayed in the upper right corner of the A-Scan display, as seen above. Once a proper angle calibration has been performed, the operator selects a reference indication and stores this indication gain level is as the “B” value using the AWS software option. All indications captured after this setup are assigned a “D” value automatically, eliminating the need for manual calculations. All data from AWS D1.1/D1.5 inspections can be saved and recalled at a later time using the EPOCH 4 series datalogger, including setup parameters, indication screen shots, and the values of A, B, C and D for each saved indication.



ADT - The Advanced DAC/TVG (ADT) software option is intended to significantly enhance the functionality of the standard DAC/TVG options already available on the EPOCH series flaw detectors, allowing users to customize inspections to their unique application requirements. The ADT feature incorporates the high-quality capabilities that adhere to ASME, ASME-3 and JIS sizing codes of standard DAC/TVG options with direct control of gain, range and zero offset, as well as reference and transfer correction. In addition, the ADT option provides new features such as 20%-80% DAC curves, customizable DAC curves, and a user-defined TVG table to meet advanced and unique inspection needs. ADT also allows the user to toggle between DAC and TVG views in many of its functions, allowing the operator the freedom to utilize both techniques during a single inspection.

Advanced DAC Options ADT’s enhanced Distance Amplitude Correction functionalities allow more user control over the information acquired and displayed while sizing flaws compared to known reflector amplitude returns. A DAC curve is used to plot amplitude variations of signals from reflectors of the same size, but at different distances from the surface. A single DAC curve is used to plot the peak amplitude of each reflector at different depths within a material to compare with peak amplitude returns from unknown flaws. In the ASME-3 criteria, three DAC curves are plotted: one at peak amplitude, one 6dB below this point (indicating a reflector 50% the size of the reference), and one 14dB below the peak amplitude point (indicating a reflector that is 20% the size of the reference). Advanced DACtakes this functionality many steps further. The operator now has the option to customize up to three DAC curves at user-defined levels between +6dB and -24dB from the primary DAC curve. Additionally, since DAC curve inspections are not valid in most applications when a reflector is below 20% of full screen height, the ADT software allows a new dynamic 20%-80% function, which automatically adjusts the gain of reference signals below 20% up to 80% during setup. This allows a great range for inspections while minimizing the necessary manual gain adjustment. Should gain adjustment be necessary, the Advanced DAC and TVG functions now have a reference correction feature that provides the operator with a digital amplitude measurement of reflectors that is directly compared to the DAC curve level, even with significant gain adjustment during the measurement.

Custom DAC Curves (+6dB, -10dB, -18dB)
20%-80% DAC Feature
ASME-3 DAC Curve
ASME-3 DAC Curve in TVG View
Additionally, any DAC curve or curves set up using the standard or advanced functions are now interchangeable with TVG tables with a single push of a button.

Advanced TVG Options In addition to providing all the options from Advanced DAC in a TVG display for seamless integration of the two sizing techniques, the ADT software now offers a customizable TVG Table option for direct access to TVG point adjustment. This new feature allows fine manual adjustment of any captured TVG points, both for gain and position, as well as manual entry of new TVG points. The TVG Table is also completely compatible with the 1kHz High PRF option on the EPOCH 4 and EPOCH 4 PLUS instruments, as well as the Interface Gate option on those instruments, allowing for specialized fast scanning and on-line inspections previously out of reach of the EPOCH 4 series instruments.

TVG Table with Individual Point Adjustment
Resulting TVG Inspection Reference Definition

Onboard DGS/AVG


Onboard DGS/AVG - The Onboard DGS/AVG option is a replacement for the old DGS/AVG option that has been available in the EPOCH 4 and 4 PLUS, which required a PC Interface Program for DGS/AVG setups. This new option allows complete DGS/AVG setups to be performed on the instrument.
The DGS/AVG method allows the operator to size defects based upon a calculated DGS/AVG curve for a given transducer, material, and reflector size, and has been designed to meet the requirements of EN 583-2:2001. This method requires that the operator only has one reference reflector in order to create a DGS curve for flaw sizing. This is much different than the DAC or TVG method which requires that the operator have representative defects at various depths within a part in order to create a curve for flaw sizing.
To allow the operator to setup DGS/AVG curves on the instrument very quickly, Olympus has developed a transducer library that is stored in the instrument’s memory. All of the required data for building DGS/AVG curves is stored in the instrument’s memory for each transducer in the library. The onboard DGS/AVG option provides the operator with rapid setup times and easy flaw size evaluation.

After activating the DGS/AVG software option and selecting the appropriate transducer from the probe library, the operator is walked through a series of instrument setups to display the DGS/AVG curve that correctly corresponds to the operator’s particular inspection. These steps include defining a reference reflector, entering adjustment parameters for the critical flaw size of the inspection and entering parameters to compensate for material attenuation of the test piece and calibration block.

Upon proper completion of the instrument setup, the operator simply captures the reference reflector, and the DGS/AVG option displays the correct DGS/AVG curve on screen, along with any warning curves defined in the DGS/AVG setup parameters. When capturing potential defects, the DGS/AVG software displays the defect size evaluation in the upper right corner of the A-Scan display, allowing immediate and easy assessment of flaws. The software also permits adjustment of gain levels, which automatically adjust the displayed DGS/AVG curves, for more accurate inspection of potential defects.
DGS/AVG Curve and Warning Curve Capturing a Defect
Gain Adjustment in DGS/AVG Mode

Spotweld Assistant

Not availableAvailable/OptionalNot availableNot availableNot available

Spotweld Assistant (SWA) - The Spotweld Assistant software option is onlyavailable with the EPOCH 4 PLUS flaw detector, and is intended to provide automated weld quality analysis using a combination of the industry-proven Spotweld Overlay functionality with an advanced quality analysis algorithm. This software feature greatly enhances the EPOCH series’ capability to inspect and characterize spotwelds with improved efficiency and accuracy.

Ultrasonic inspection of spotwelds involves the analysis of what is known as the “ring-down” of sound energy within the weld nugget. Unlike many direct-measurement techniques, spotweld inspection looks at the characteristics of the multiple echoes returned from sound ringing within the weld nugget to determine the quality of the weld. Echo spacing, sound attenuation, and intermediate echo detection are some of the indicators of weld quality analyzed by trained inspectors. Ultrasonic spotweld inspection is completely based on comparison between known “Good” and “Unweld” conditions with unknown welds, and requires a highly trained operator to perform a comprehensive inspection.

“Unweld” Reference Condition
“Good” Weld Reference Condition

The Spotweld Assistant is not intended to remove the necessity of a trained operator; instead, it is meant to enhance the ability of a trained operator to judge welds more efficiently. The operator begins by storing both a “Good” and “Unweld” reference condition into the EPOCH 4 PLUS to calibrate these control situations. The software then uses default comparative algorithms to rate unknown welds based on these stored conditions. If the trained operator disagrees with the software’s recommended weld rating, the operator can override this rating manually.

SWA Automated Weld Rating

For more advanced users, the operator is able to manually adjust the comparative algorithmic parameters, such asAttenuation AnalysisIntermediate Echo Detection and Echo Spacing characteristics to allow a more customized and a higher quality automated weld-quality rating system.The Spotweld Assistant option also has advanced features associated with the GageView Pro interface program. Using GageView Pro, the user can set up a full spotweld inspection plan. The operator can pre-define ID values for all welds to be inspected, all required SWA calibrations, and Memos reminding the operator to change transducers when calibrations change. The EPOCH 4 PLUS is capable of storing all weld rating information, including calibrations, waveforms, weld rating suggestions, and any operator weld rating overrides for recall and reporting purposes.

GageView Pro Inspection Plan

Exported SWA Excel File

Interface Gate

Available/OptionalAvailable/OptionalAvailable/OptionalNot availableNot available

Interface Gate - The Interface Gate option is designed to graphically compensate for the change in a water path distance or other delay between the test material and transducer. When the option is activated, a third gate (Interface Gate) is visible on the EPOCH’s display. You can position this Interface Gate in the area where you expect to detect the interface echo. The interface echo is a result of the sound energy reflection at the interface between the water path and the front surface of the test material. The Interface Gate maintains the interface echo on the left hand side of the EPOCH screen, regardless of the water path distance, thereby maintaining a precise “acoustic” zero from which the instrument makes digital measurements. The instrument’s flaw gates (Gate 1 and 2) automatically track the location of the Interface Gate. The Interface Gate can be used in standard measurement mode or in Echo-to-Echo mode.

The Interface Gate is mainly used in immersion applications where the water path distance between the front surface of the test material and transducer face is continuously changing. The application may involve an “on-line” type approach with the test material moving steadily past a stationary transducer, or vice versa. If the front surface of the test material is not uniform, that causes slight differences in the water path distance.

High Pulse Repetition Frequency

StandardAvailable/OptionalAvailable/OptionalNot availableNot available

High Pulse Repetition Frequency (PRF) - In many “on-line” immersion applications, the inspection pieces are passed by the transducer at a fast pace compared to normal, manual scanning. If proper care is not taken, this can result in an effect known as “interleaving”. This occurs when a pulse is transmitted into the test material, but the transducer moves prior to the return signal, and it can result in the loss of important data. To compensate for this effect, the High PRF option is used to hold the rate at which a pulse is transmitted into the test material at a high value (1,000 Hz). This is commonly used in conjunction with the Interface Gate option for “on-line” immersion inspection of parts moving quickly by a fixed transducer.

Low Pulse Repetition Frequency


Low Pulse Repetition Frequency (PRF) - The Low Pulse Repetition Frequency option is available on all of the EPOCH series instruments, and is designed to hold the pulse repetition frequency (PRF) of the instrument to a fixed setting of 30 Hz. This option is commonly used in inspections that deal with materials that have very long sound paths, and is intended to avoid a phenomenon known as “wrap-around noise”. When inspecting a piece with a long sound path at normal “Auto” PRF, there is a point when the time the sound takes to make a full round-trip from pulse to receive is longer than the time between pulses. If a test setup produces multiple echoes, then the issue is the length of time required for the last multiple echo to arrive at the receiver. Normally, the instrument builds a waveform response by pairing a certain pulse with its return signal and analyzing the characteristics of the return signal. However, in this situation, the received signal does not correspond to its initial pulse (according to the instrument’s timing algorithm). The overall affect is the potential for random noise and echoes on the A-Scan display. The Low PRF software feature slows the pulsing of the unit and allows for a certain pulse to be correctly paired with its return signal.

Floating Gate

Not availableAvailable/OptionalAvailable/OptionalNot availableNot available

Floating Gate - The Floating Gate software allows the operator to track and make measurements from A-Scan echoes at either the -6dB or -12dB point. After activation and setup, the gate “floats” at either of these points and tracks changes in the amplitude of a captured signal. This feature is intended to take more consistent, precise readings, especially in Edge Detect mode, by always taking measurements from the same relative amplitude of an echo. The feature also helps to maintain constant measurements in scanning applications where quality of transducer coupling may vary. The Floating Gate software is included with the B-Scan software, and is commonly used in conjunction with Edge Detect mode and B-Scan to maintain the accurate acquisition of measurements from corroded pipe and other materials. Floating Gate can also be used with the Interface Gate to track amplitude changes in the interface echo.

Curved Surface Correction

StandardAvailable/OptionalAvailable/OptionalNot availableAvailable/Optional

Curved Surface Correction - The Curved Surface Correction software is intended to adjust digital measurements from a curved inspection surface during angle beam inspection, to compensate for curvature effects on sound path length. The algorithms built into the EPOCH instruments to calculate sound path (V-path) distance, surface (skip) distance, and depth of a reflector when performing angle beam inspection are written for flat surfaces, such as welded plates. The measurement calculations are different in curved surfaces, such as pipes and cylinders, due to the more complex geometry of the part. Therefore, a separate algorithm has been written, the Curved Surface Correction, that requires the operator to input the outer diameter of the test piece and then calculates the correct V-path, skip distance and depth of a reflector. All other calibration settings, including verification of refracted angle and part thickness, must be entered correctly for accurate measurements.

Spotweld Overlay

Not availableAvailable/OptionalAvailable/OptionalNot availableNot available

Spotweld Overlay - The Spotweld Overlay software option provides stored templates for comparison of unknown spotweld conditions to known Good, Stick, Undersized, and other known weld conditions. Upon activation, the operator uses the five soft keys (F1-F5) on the EPOCH to store templates of known weld conditions. These templates can then be recalled to the screen over an unknown weld condition under interrogation (in live A-Scan or Freeze mode) for comparison purposes. Although this option was specifically designed for Spotweld inspection, its template and comparison capabilities can be used in a variety of applications.


Not availableAvailable/OptionalAvailable/OptionalNot availableNot available

Autofreeze - The Autofreeze software option allows the operator to automatically freeze the live A-Scan when a gate alarm is triggered. This function is typically used in scanning applications or applications with signals that are difficult to obtain and/or maintain because of coupling or orientation issues. The operator activates a gate alarm and sets the gate parameters to capture only echoes of interest, and any echo that breaks the gate and triggers the alarm automatically activates the screen freeze function. This allows the operator to thoroughly inspection signals that may be difficult to catch or maintain in a live screen.

Backwall Attenuator

Not availableAvailable/OptionalNot availableNot availableNot available

Backwall Attenuator - The Backwall Echo Attenuator software option is only available in the EPOCH 4 PLUS, and is designed to independently adjust the gain in a screen range region defined by the Gate 2 start point and beyond. The Backwall Echo Attenuator option is commonly used with two specific forms of inspections, both dealing with very small defects. The first is an inspection where potential defects may not be oriented parallel to the direction of sound from the transducer. In this situation, sound will reflect from the defect but not return to the transducer due to the orientation of the reflector. Therefore, such defects are detected by monitoring for backwall signal loss or attenuation. This backwall amplitude change may be missed entirely if the backwall signal is saturated. The Backwall Echo Attenuator option allows the operator to monitor the backwall at a lower gain setting for any signal loss, while still scanning the remainder of the test piece at a high gain level for small defects. The second common inspection for the Backwall Attenuator is in porosity inspection. Because porosity tends to scatter sound instead of return a clear echo, backwall amplitude is sometimes the only way to positively differentiate porosity from material grain structure. The Backwall Echo Attenuator is again used to bring the entire backwall signal on screen to be closely monitored by the operator.

Wave Analysis

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Wave Analysis - The Wave Analysis software option allows the operator to make precise point-to-point measurements from any two points along a waveform. This option activates to indexing arrows that trace the length of the visible waveform in the A-Scan view. Typically, the operator will capture a single echo waveform using the instrument gate and use the zoom function to view the waveform close up. The Wave Analysis software then allows the operator to trace the entire waveform with two arrows and take a measurement between these two arrows. A common application for the Wave Analysis software is the measurement of oxide scale on the opposite surface of a pipe or tube. The backwall echo is captured and zoomed using the instrument gate, and the Wave Analysis arrows are used to measure the distance between the peaks representing the inner and outer surfaces of the oxide layer, as seen below.

Echo to Echo


Echo to Echo - The Echo-to-Echo software option allows the user to make a digital measurement between two echoes captured in Gate 1 and Gate 2 on the instrument. This common measurement technique is used to increase the precision of thickness readings by measuring between multiple echoes of a single thickness inspection, eliminating any couplant layer or surface condition discrepancies. This technique is also used to get a clear measurement from a near-surface echo that is obscured by the ringing of the main bang in its first reflection(s).

Narrowband Filters

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Narrowband Filters - Narrowband Filters allow the operator to variably tune out unwanted or unnecessary ultrasonic frequencies being received from the test piece into the EPOCH. This filtering can significantly better the signal-to-noise ratio of the A-Scan, particularly in non-homogenous or scattering materials. The Narrowband Filters have preset ranges to encompass commonly used transducer frequencies, but with the Advance User Filter setting from the EPOCH settings menu, the Filters can be tuned to custom low- and high-pass settings for optimization of the option’s capability.

 Square Wave Pulser


Square Wave Pulser - The Square Wave Pulser is a powerful tool to improve penetration and response of transducers, particularly with low frequency probes and in highly attenuating materials. Unlike the standard, negative spike pulser of most UT inspection units, the tunable square wave pulser matches the EPOCH’s excitation pulse duration to the frequency of a particular transducer, allowing the transducer to ring closer to its natural resonance and increase the amplitude of the signal transmitting into the test material from the transducer. This is especially useful with lower frequency transducers, as the natural resonant period of lower frequency transducers is longer than that of higher frequency tranducers and a traditional spike pulse does not obtain optimal results at these longer resonance frequencies.

2.25Mhz Probe with Square Wave Pulser
2.25MHz Probe with Spike Pulser – 12dB Difference!

Extended Range


Extended Range - The Extended Range option increases the standard measurement range of the EPOCH LT and EPOCH 4B from 0.16 inches – 200 inches (4mm – 5,000mm) to the extended range of 0.038 inches – 400 inches (1mm – 10,000mm).

Expanded Memory


Expanded Memory - The Expanded Memory option increase the memory capacity of the EPOCH LT, EPOCH 4B and EPOCH 4 to allow the storage of more waveforms/calibrations and/or thickness readings. The memory is expanded according to the table below:

Expanded Memory CapacityStandart Memory Capacity
Thickness Readings40,00010,000


The GageView and GageView Pro Interface Programs are Windows-based applications that collect, create, manage, and print data from Olympus thickness gages and flaw detectors.GageView is compatible with gage models 35DL, 35DLHP, and MG2-DL. It provides the following capabilities:

  • Creating Datasets and Surveys
  • Editing stored data such as thickness data
  • Viewing Dataset and Survey file information including thickness readings, waveform, gage setup values, and transducer setup values
  • Downloading and uploading thickness surveys to and from the Panametrics ultrasonic thickness gages
  • Exporting Surveys to spreadsheets and other programs
  • Collecting snapshot screens (graphical data sent by a thickness gage that duplicates the exact screen display)
  • Printing reports such as Thickness, Setup Table, Statistics, Color Grid, and others
  • Upgrading gage operating software

GageView Pro is compatible with flaw detector models Epoch 4, Epoch 4B, Epoch LT, Epoch 4 PLUS, and Epoch XT, as well as the gage models listed above. When used with flaw detectors, GageView Pro provides the following capabilities:

  • Exporting thickness or amplitude data saved on the Epoch to Excel, Word, or similar programs
  • Create, format, and manage test databases
  • Export real-time screen snapshots, including B-scans, to a PC or printer
  • Import and export setups between the Epoch and a PC
  • Set up inspection plan templates, including pre-loaded probe calibrations, IDs, and memos
  • Create a custom DGS probe library
  • Upgrade Epoch operating software

EPOCH XT with inspector inspecting a pipe, with buggy

Our advanced digital ultrasonic flaw detector, the EPOCH XT, offers a fully encoded B-scan option that displays scanned thickness measurements of internally corroded pipe or tank walls as easy-to-read cross-sectional images. This time-saving B-scan option works with multiple crawlers and encoders providing important transducer location information of distance traveled. Complete with thickness markers the B-scan option provides readings at specific scan locations and the ability to automatically save A-scans for minimum thickness data or when triggered by alarm conditions.


  • Bi-directional, uni-directional, and manual scan modes
  • Ability to simultaneously view A-scan and B-scan
  • Scanning resolution up to 0.020 in. (0.5 mm)
  • Fast scanning rate (variable based upon operator selectable resolution) of 20 in./sec. (500 mm/sec) with a resolution of 0.020 in. (0.5 mm)
  • Automatic audible alarm if scan speed exceeds limit
  • Operates in all test modes including Time Varied Gain (TVG) and Floating Gate
  • Floating Gate improves precision and consistency of thickness readings
  • Ability to save a single screenshot or an entire B-scan
  • Internal storage of up to 150,000 B-scan thickness readings per scan
  • Ability to scroll and review internally stored B-scan data
  • Audible and visual Minimum Depth Alarm for thickness below an operator defined level
  • Minimum Thickness continuously captured and updated on screen

Powerful Software and Reporting Capabilities

Color-coded Scan Views

The EPOCH XT BSCAN software features color-coded scan views for striking visual feedback. Triggering a Minimum-Depth Alarm changes the scan color from green to red, immediately alerting the operator of a critically thin area of material. By selecting the Color Gradient view, the B-scan image gradually shifts from red to green over the full thickness of the inspection window, allowing the operator to visualize thickness variations across the entire inspection range!

Color Gradient View
Alarm Color Change

Includes Floating Gate Software Option

Included with the B-scan software is the Floating Gate software option. This option allows the operator to “float” Gate 1 and/or Gate 2 at a selected height compared to a gated echo (-1 dB to -14 dB). This feature is intended to allow more consistent, precise readings, and is especially useful while acquiring B-scan data in Edge Detect mode.

B-scan with Floating Gate

B-Scan Options Specifications*

B-Scan Standard Kit

EPXT-BSCAN: B-scan operating software for the EPOCH XT
EP4/ENC: B-scan Position Encoder
EPXT-ENC-CBL-XX: Position Encoder Cable with specified cable length. (Cable lengths available 10, 25, 50, and 100 feet)

  • Panametrics D790-SM, 5.0 MHz, 0.434 in. (11.0 mm) diameter, transducer sold separately
  • Panametrics BCMD-316-XXB or L1CMD-316-XXB transducer cables also sold separately
  • Transducer cables available in 5, 10, 25, 50, and 100 feet lengths
  • B-scan option can be added to existing EPOCH XT units remotely if the instrument is equipped with the Hardware I/O option.

Optional Accessories

EP4/ENC-PH: Probe holder assembly
EP4/MW: One pair of magnetic hold down wheels
EP4/EPB: Extension pole bracket
EP4/WC: Replaceable wear cap
EP4/EWC: Replaceable extended wear cap
GAGEVIEWPRO-KIT-USB: Interface Program on CD-ROM, includes USB interface cable

Encoder Specifications

Resolution: 50 pulses per inch (0.020 in. per reading) 2 pulses per mm (0.5 mm per reading)
Outputs: Standard quadrature position outputs, TTL/CMOS compatible
Power: Single +5 V supply provided by EPOCH XT
Connector: LEMO®, four conductor
Water Fitting: Bronze barbed fitting requires 5/32 in. (4.0 mm) ID tubing
Pipe Diameter: Minimum 3.0 in. (76.2 mm)
Dimensions: (L x W x H) 4.41 in. x 2.75 in. x 2.70 in. (111 mm x 69 mm x 68 mm)
Weight: 0.93 lb (425 g)
Construction: Rugged, sealed cast aluminum
Note: Other commercially available encoders or crawlers can be used with the EPOCH XT B-scan option.