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VOLTA is a high-power 2-channel portable ultrasonic instrument custom-designed for Electro Magnetic Acoustic Transducer (EMAT) applications.

VOLTA features a patented pulser technology to satisfy the most energy-demanding EMAT applications in a compact and rugged package. Standard software built on Innerspec Technologies Operating Platform (ITOP) includes an intuitive menu to set up any EMAT application using standard sensors from Innerspec’s catalog for normal beam, angled beam, and guided waves.

Advanced application software is available with easy-to-use wizards to facilitate setup and analysis for MRUT (Medium-Range UT / 0-3 m), LRUT (Long-Range UT / 1-100 m), Rail Heads, Thin Welds, and other exclusive solutions.

The NDT-Web™ graphical interface permits real-time control of the instrument using the detachable ruggedized tablet provided with the instrument, or any other wireless device (MS Windows®,iOS™, Android). The user software integrates seamlessly with Innerspec’s NDT-Link™ portal to provide a complete suite of productivity tools including Asset Management, Remote Support, Data Sharing, and Reporting.


  • 2 Ultrasonic Channels for EMAT applications ranging from 20 kHz to 8 MHz.
  • 1,100 Vpp and 6 kW of peak power per channel, 1 to 10 cycles.
  • Standard software permits running any EMAT application including normal beam, angled beam, and guided waves.
  • Custom software for MRUT (Medium Range UT), LRUT (Long-Range UT), Rail Heads, Thin Welds, and other unique applications.
  • NDT-WEB user interface and seamless integration with NDT-LINK portal.
  • Complete suite of productivity tools for Asset Management, Remote Support, Data Sharing, and Reporting.


Ultrasonic Channels 2
Bandwidth 20 kHz to 8 mHz
Pulse Repetition Rate up to 1,000 Hz
RF Pulser Spike, Toneburst Waveforms
6 kW Power Output
1,100 Vpp @ 24 Amp pk-pk into 50 Ohms
1% Maximum Duty
Receiver LEMO Inputs:
1 kΩ Input Impedance
16 dB to 100 dB Gain
<0.1 dB Gain Resolution
BNC Inputs:
1 kΩ Input Impedance
-14 dB to 60 dB Gain
<0.1 dB Gain Resolution
Pulse / Receive Modes Pulse Echo (Uni- & Bi-Directional)
Pitch-Catch (Uni- & Bi-Directional)
Analog / Digital Converters 14-bit, 125 MHz
Rectification Full-Wave,
+/- Half Wave,
RF Mode
Filtering FIR Digital Filters,,Analog Bandpass filters
Evaluation Gates Auto-set gates (based on Wizard),
User Adjustable
Encoder Interface 2x A/B Quadrature
PC Communication Wi-Fi 802.11n 2.4G, Bluetooth 4.0, USB, Ethernet
Software ITOP with NDT-WEB
Internal Storage Capacity 64 GB eMMC
Internal Memory 4 GB RAM
Probe Connector Lemo, BNC, Thermocouple
Operating Temperature 32°F to 105°F
(0°C to 40°C)
VOLTA AC Power Input 100-240 VAC, 50-60 Hz
VOLTA AC Power Output 24 V @ 6.25 A, 150 W Max.
VOLTA Rechargeable,Battery Li-Ion 14.4 V @ 6.8 Ah, 98 Wh,
4 – 8 hours, Hot-Swappable
Other I/O HDMI, Bluetooth, Thermocouple
Dimensions 16 W x 12 H x 6 D (in.)
406 W x 305 H x 152 D (mm)
Weight 20 lbs (9.1 kg)


  • Ergonomic backpacks and MOLLE pouches to transport the instrument and all the necessary sensors and accessories to the worksite, and to comfortably carry the equipment while performing inspection.
  • Spare batteries and battery charger.
  • As an EMAT inspection equipment, EMAT and DCUT Sensors and Accessories from Innerspec catalogs are available.