OPBOX ver 1.2 USB 2.0 is a complete ultrasonic testing device, suitable for all ultrasonic measurements and due to many additional digital inputs/outputs and internal processor it can be used as a controller for more complicated devices.

The box can work together with following devices:

- multi channel multiplexer
- Phased Array systems
- Scanner - it has input for incremental encoders;

The box has an implemented one channel pulser & receiver and can be used with one transducer or with two (one is sending, and the second one receiving).

Size: 164mm x 138mm x 34 mm

Power Supply: 9V DC / 2A

Weight: 590g

Features:

- Low noise preamplifier
- Switchable analog filters
- Support fast TGC (time gain compensation)
- 2 signal inputs PE and TT
- Input attenuator (-24dB)
- Input Impedance 50 Ohm, 10pF
- 100MHz sampling frequency
- Delay settings up to 255us
- Various triggering mode
- Interfaces USB 2.0 HiSpeed
- Dimensions: 164mm x 138mm x 34 mm
- BNC or Lemo analog connectors
- DB15 connector for I/O lines

Technical data

A/D converter:
- Resolution: 8 bits (internal 10 bits)
- Sampling frequency: 12.5, 25, 50 or 100MHz 1

Delay time: Post trigger 255 us1
Data buffer: up to 128kB 1

Analog parameters:
- Input amplifier gain: from -28dB to 68dB
- Input preamplifier 0dB or +24dB
- Sensitivity: +/- 0.275V or 2Vpp
- Bandwidth: 0.5 MHz - 25 MHz (-3dB)
- Input impedance 50Ohm, 10pF
- Filters switchable: 0.5 - 6MHz1, 0.5 - 10MHz1, 0.5 - 15MHz1, 0.5 - 25MHz1, 1 - 6MHz1, 1 - 10MHz1, 1 - 15MHz1, 1 - 25MHz1, 2 - 6MHz1, 2 - 10MHz1, 2 - 15MHz1, 2 - 25MHz1, 4 - 6MHz1, 4 - 10MHz1, 4 - 15MHz1, 4 - 25MHz1

DAC (TGC) with arbitrary waveform generator
-Resolution of time step 10ns
- Resolution 8bit
- Max. Gain changing 48dB pro step
Counters.Input for incremental encoder: 2 channels 8bit

Trigger
Internal trigger rate software
- External trigger rate TTL Signal
- Multiplexer TTL
- Trigger output signal TTL Signal

Additional inputs:
- 2 digital lines for external trigger feature
- 2 digital lines TTL Signal

Output:
- 6 digital lines TTL Signal (Multiplexer control up to 64 channels)
DATA BUS USB 2.0 (48MHz bulk transfer)

Pulser
-Pulse Voltage off - 360V (positive pulse, Short circuit step pulser)in 13 levels
- Pulse lenght (loading time) from 0 - 3.1us with resolution 0.1us
- Fall Time <=20ns
- Pulse duration Short circuit, bandwidth up to about 50MHz
- Output impedance < 1Ohm

Characteristic of the pulser on board:

Pulser circuit waveforms: The rising edge of the Trigger signal (described as Trigger) initiates the transducer charging process. After this time (form 0.1 to 3.1us) a transistor switch which discharges the transducer is turned on (discharge time is about 20ns, but it can be longer, if the capacitance of the transducer is too large; the limit is reached, if the transducer is made from the standard ceramics, is 0.1 mm thick and has 8 mm diameter).

Because of the very low output impedance of the device (<1 Ohm) and short discharge time the pulse generated with this device could be concerned as a real pulse answer for the most transducers. Transducers with a parallel matching inductance should not be used, since they do not allow the transducer to be pre-charged (the inductance causes a short-circuit).