Suppresses Noise and Enhances Weak Signals

• Easy to set up and use
• Portable (7"x4"x1.5"; 14oz.) (18cm x 10cm x 4cm; 0.4kg), rugged, perfect for field use
• Placed between transducer(s) and UT instrument
• Operates in both pulse-echo and pitch-catch/thru-transmission modes
• Battery or AC powered
• Gives significant performance boost to old or new, analog or digital UT instruments



The Noise Suppressor II can be set up to operate as a "Smart" PreAmp and provide:

• Selective Amplification
• Boost Desired Signal Only
• Suppress Noise
• Total Gain of 60 dB in a Specific Tunable Band
• Adjustable in Steps of 10, 20, 30, 45, and 60 dB



Due to strong interest in having the features and capabilities of the Noise Suppressor II available in both higher and lower frequency ranges, the Noise Suppressor II is produced in five models. Each model functions identically except for its own operating frequency range:

Model Interpretation Operating Frequency Range
NSII-H "H" = High 8 to 25 MHz*
NSII Standard 1.5 to 7 MHz
NSII-L "L" = Low 0.5 to 2.4 MHz
NSII-XL "XL" = Extra Low 150 to 700 KHz
NSII-XXL "XXL" = Extra Extra Low 50 to 240 KHz

*Model NSII-H has one filter, filter A

The Noise Suppressor II now covers the frequency range from 50 KHz to 25 MHz with five overlapping models.

The Noise Suppressor II™ is an add-on unit to ultrasonic pulser/receivers and flaw detectors. The unit can be set to either suppress noise (spikes or background) or to increase the signal/noise ratio of weak desirable signals, or both.

The Noise Suppressor II™ combines three independent functions that can be used in any combination — preamp (up to 30dB in 10dB steps) and two manually tunable bandpass filters. The unit incorporates novel circuitry that enables the inspector to tune each filter anywhere in the 8 to 25 MHz, 1.5 to 7.0 MHz, 0.5 to 2.4 MHz, 0.15 to 0.7 MHz bands or 50 to 240 KHz, depending on which NSII model is selected. The width of the band is also adjustable (low, mid, wide) and each filter can either be set to null out a noise signal (-20dB attenuation applied in the tuned band) or to enhance a desired signal (+15dB gain applied in the tuned band).

One filter can be used to null noise while the other is set to simultaneously enhance a desired signal, or both filters can be set identically to effectively “double up” on either noise cancellation (via -40dB total attenuation) or signal enhancement (via +30dB total gain).

The NSII is connected between the transducer(s) and the pulser/receiver or flaw detector. It is housed in a small (7”x4”x1.5”)(18cm x 10cm x 4cm) enclosure weighing 14 ounces (0.4kg) and is powered by either a 9v battery or ac. It operates in both pulse-echo or pitch-catch/thru-transmission modes. All settings are via detented rotary switches so that the user is assured of repeatable inspections. The unit interfaces with any type of analog or digital ultrasonic unit to provide an add-on enhancement.

*Model NSII-H has one turnable filter (Filter A) and provides a total gain of 45db in adjustable steps of 10, 20, 30, and 45db.

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