MINI MAX 001

DAKOTA ULTRASONICS MINI-MAX Ultrasonic Extensometer

Only by Request

The MINI-MAX v2.0 Ultrasonic Bolt Tension Monitor defines the state of the art in the measurement of the actual elongation produced by tightening a threaded fastener. MINI-MAX can measure the elongation very accurately in fasteners of virtually any material from 1/2 inch to 50 feet in length.
Weight 15 lbs
Dimensions 23 × 17 × 11 in

The measurement is achieved by determining the change in the transit time of an ultrasonic shock wave along the length of the fastener as the fastener is tightened using a mechanical method. The time is then converted to elongation, load, stress, or %strain. The Mini-Max has 4GB SD storage capacity for data storage in a group file format, as well as .tif file screen captures for additional documentation. Our DakView PC & OSX utility software completes the reporting process and allows for present and future verification.

Highlights

  • Can measure bolts from 1/2″ up to 50 ft. (15.24 m).
  • Auto calibration for system zero.
  • Built in load calibration toolkit.
  • Wide range of material types and calibrations.
  • Selectable 200 volt square wave pulser (100, 150, 200 volts).
  • Variable transducer damping (50, 75, 100, 300, 600 & 1500 ohms), for use with 1-10 MHz transducers.
  • Large 110 dB gain range.
  • Variable digitizer for improved resolution and stability.
  • Temperature compensated.
  • Hi/Lo alarm limit used for for tolerances.
  • Measurement quanities – Time (nanoseconds), Elongation, Load, Stress, and Percent Strain.
  • Display Options – RF, Rectified, Large Digits with Limits Bar.
  • Display Resolution – 1/8″ VGA 240 x 160 pixels.
  • The Auto Set feature automatically optimizes detection and adjusts display.
Physical  

  • Size:
    Width (2.5in/63.5 mm)
    Height (6.5 in/165 mm)
    Depth (1.24 in/31.5 mm)
  • Weight:
    13.5 ounces (with batteries).
  • Keyboard:
    Membrane switch pad with
    twelve tactile keys.
  • Operating Temperature:
    14 to 140F (-10C to 60C)
  • Case:
    Extruded aluminum body with nickel-plated aluminum end caps (gasket sealed).
  • Environmental:  Meets IP65 requirements.

Connections

  • USB:
    Direct USB-C 1.1 PC connectivity. Windows & OSX interface software.
  • Line Power:
    USB-C to PC or AC adaptor.
  • Temperature Sensor:
    5 pin Lemo 1.
  • Transducer Connector:
    Lemo 00.

Memory

  • Log Format:
    Grid (Alpha Numeric).
  • Capacity:
    4GB internal SD memory.
  • Screen Capture:
    Tagged interface file (.tif) capture for quick documentation.
  • Custom Setups:
    64 user configurations.

Power Source

  • Line Power:
    USB to PC or power outlet.
  • Batteries:
    Alkaline 35 hrs, Nicad 10 hrs, NI-MH 35 hrs. Auto power off after 5 minutes idle. Battery status icon.

Transducers

  • Transducer Types:
    Single element – 1 MHz to 10 MHz frequencies, and 1/8” to 1” diameters.
  • Glue-On:
    Available for short bolts with minimal/short elongations to eliminate transducer placement errors.
  • Connectors:
    Microdot, Lemo 00, or BNC options depending on the transducer model selected.
  • Custom Trnasducers:
    Available for special applications.
  • Temperature Probe:
    Automatic temperature compensation.

 

Electronics 

  • Display:
    1/8in VGA grayscale display (240 x 160 pixels); viewable area 2.4 x 1.8in (62 x 45.7mm); EL backlit (on/off/auto invert).
  • Screen Refresh Rate:
    30 Hz.
  • Timing:
    Precision TCXO timing with single shot 100 MHz 8 bit ultra low power digitizer.
  • Pulser Type:
    Square Wave.
  • Pulser Voltage:
    Selectable 100, 150 and 200 volts.
  • Pulse Width:
    Selectable options Spike, Thin, and Wide. 80 to 400 ns.
  • Damping:
    50, 75, 100, 300, 600, & 1500 ohms.
  • Frequency Band:
    Broadband 1.8 – 19 MHz (-3dB) filter.
  • Horizontal Linearity:
    +/- 0.4% FSW.
  • Vertical Linearity:
    +/- 1% FSH.
  • Amplifier Linearity:
    +/- 1 dB.
  • Amplitude Measurement:
    0 to 100% FSH, with 1% resolution.
  • Delay:
    0 – 999.999 in (25,400 mm) at steel velocity.
  • Measurement Gate:
    One gate with audible and visual alarm. Amplitude 5-95%, 1% steps.

Features

  • Setups:
    64 custom user defined setups; factory setups can also be edited by the user.
  • Auto Set:
    Automates the detection, scope, and display setting process for each individual bolt.
  • Alarm Limits:
    Adjustable Hi/Low tolerances with visual LED’s and audible beeper.
  • Field Calibration:
    Vector or Regression correction curve for increased accuracy using Load & Stress.

Display Views

  • A-Scan:
    Rectified +/- (half wave view), or RF (full waveform view).
  • Large Digits:
    Digital display only.
  • Alarm Limits Bar:
    Hi & Lo alarm limits for displaying an acceptable tolerance range.
Measuring 

  • Units:
    English (in), Metric (mm), or Time (μs). Farenheit or Centigrade.
  • Velocity:
    0.0492 to .5510 in/μs (1250– 13995 m/s).
  • Measurement Modes:
    Pulse-Echo (P-E).
  • Measurement Range:
    1 to 999.999 in (2540 cm), dependent on material type and consistency.
  • Detection:
    Zero Crossing.
  • Resolution:
    +/- 0.00001 in (0.0001 mm).
  • Calibration:
    Automatic, Fixed, Single or Two-Point zero calibration options.
  • Quantities:
  • Time – Nanoseconds.
  • Elongation – Change in length (inches/millimeters).
  • Load – Force load applied (pounds KIP, or megapascals MPa).
  • Stress – Force for unit area stress applied (inches per inch or millimeters per millimeter).
  • %Strain – Ratio of elongation to effective length.
  • Bolt Materials:
    Select types from a preset or custom list.
  • Repeatability Bar Graph:
    Bar graph indicates stability of measurement.

Certification

  • Factory calibration traceable to NIST & MIL-STD-45662A.

Warranty

  • 2 year limited
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