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

VOLTA II 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

20 kHz to 8 MHz – (All Normal Beam, Angled Beam, Guided Waves: LRUT, MRUT,)

Pulse Repetition Rate
up to 1,000 Hz

RF Pulser
1-8 cycles, fixed and variable frequency tone-bursts
6 kW Power Output
1,000 Vpp @ 24 Amp pk-pk into 50 Ohms
1% Maximum Duty

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, 170Msps

+/- Half Wave
RF Mode

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 2x802.11ac/ax dual band
Bluetooth 5.0
USB 3.0, Ethernet


Internal Storage Capacity
500 GB SSD

Internal Memory

Probe Connector
Lemo, BNC, Thermocouple

Operating Temperature
32°F to 105°F (0°C to 40°C)

VOLTA AC Power Input
USB Type-C adapter input: 100-240 VAC, 50-60 Hz

VOLTA AC Power Output
USB Type-C power: 20V @ 5A, 100 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

16 W x 12 H x 6 D (in.)
406 W x 305 H x 152 D (mm)

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.