FEATURES:

• Up to 16 pulser/receiver channels per board

• Up to 256 pulser/receiver channels per computer

• Pulse damping selection for each channel

• Controllable pulse/echo or through transmission mode

• High-voltage pulse up to 300 volts

• Adjustable pulse width (50ns to 484ns)

• High-voltage switch-off during data acquisition for low noise operation

• Wide-range dynamic gain for each channel

• Adjustable DC offset

• Selectable low-pass and high-pass filters

• User-specified pulser channels and receiver channels

• User-specified firing sequence

DESCRIPTION:

The DT8G and DT16G are 8- and 16-channel ultrasonic pulser/receiver board containing 8/16 dedicated pulsers and a multiplexer. With DT8G and/or DT16G, PCIPR300M card, PCIUT3100M card and DSPUT5000M boards can be used to build multi-channel systems through one ribbon cable and two coaxial cables. The controllable parameters include pulser channel number, receiver channel number, damping resistance, mode, pulse width, and pulse voltage.

With the help of the receiver on the PCIPR300M, PCIUT3100M card or DSPUT5000M, the signal from the multiplexer can be processed as specified by the user. The receiver features high pass filters, low pass filters, rectifiers, gain, and DC offset adjustments. These parameters are quickly and easily changeable at any time, which is very important for high speed data acquisition requiring fast channel switching.

Windows dynamic libraries for Microsoft C/C++, Visual Basic, and LabVIEW are provided to enable end users to easily develop their own software. With these libraries, the user can set up any firing sequence along with different gains, rectifications, and DC offsets for each channel.

The DT8G and DT16G boards can be installed into the computer’s PCI slots. Multiple DT8G and/or DT16G cards can be installed in a single computer to build a system with up to 256 channels. Each board has 8 (16) pulser cables and 8 (16) receiver cables. The cables can be equipped with BNC, Lemo00, SMB, or small profile Burndy connectors.

Applications include flaw mapping, thickness mapping, material evaluation and characterization, and pipeline girth weld inspections.

SPECIFICATIONS:

Pulse Voltage        -40V to -300V, 256 steps. Higher voltage is available upon request.

Pulse Width           50 ns to 484ns, 256 steps

Damping                500Ω, and 50Ω

Receiver Gain        0 dB to 80 dB in 0.01dB increments.

DC Offset               -2.5V to 2.5V in 5mV increments

Low Pass Filter     All, 48MHz, 28MHz, 18MHz, 8.8MHz, 7.5MHz, 6.7MHz, or 5.9MHz

Mode                      Controllable pulse/echo or through transmission mode with internal relay

High Pass Filter    4.8MHz, 1.8MHz, 0.8MHz, or 0.6MHz

Waveform              Full rectify, + half rectify, - half rectify, or RF

Card Dimension    12.5" x 4.5"

Channels per card  8 or 16 channels

Max cards/Computer 16 cards

Options     - LEMO00 connectors

                   - SMB connectors

                   - Optional output voltage: -350V