SRV Tester

Next generation SRV Testing Machine designed to test lubricant, grease, additives, and materials in high-frequency linear oscillation motion.

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SRV Tester Overview

Main Features: 

  • 10 µm – 2.8 mm stroke / 0.1 mm to 5 mm stroke
  • Up to 300/500 Hz oscillating frequency
  • High-resolution piezo sensors
  • Electromagnetic coils
  • Room to 350°C (optional -40°C, 800°C) temperature
  • 3000 N downforce

Rtec SRV test system measures friction and wear of lubricant, oil, grease, and additives in linear oscillatory motion. Generate data compliant with several ASTM, DIN, and ISO standards. Test collected samples from the field or for research purposes.

The SRV tester comes fully automated and computer controlled. The setup is easy to calibrate and comes with standard oil and samples. Additionally, it runs several standard test methods and allows for new custom methods. This insures for future petroleum product standards.

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    Fretting tester from Rtec instruments model FFT-1

    SRV Test Machines Like No Other

    This test method covers studying tribology between two contacting surfaces subjected to high-frequency linear oscillation.

    Downforce Control

    Real-time downforce control. 

    Voice Coil

    Electromagnetic actuator to impart linear reciprocating motion. Dependent on the test-optional additional coils. These are available to double the friction force range.

    High Accuracy Position Control

    The most accurate and precise displacement control in the market. Up to 1nm resolution and micron level of accuracy. 

    Environmental Chambers

    The wide temperature range standard room to 180°C (from -40 to 400/800 °C available). Closed-loop temperature control. 

    Fretting tester from Rtec instruments model FFT-1
    Flexure Design -Unmatched Waveform Control

    Magnetic flexure design prevents friction of rolling or bearing. In addition, the coil controls the stroke by monitoring smallest of increments of waveform change.

    Piezo Friction Measurement

    FFT testers come with  piezo sensors to measure real-time friction at high frequency. Ultra low noise amplifiers allows detection of minute changes in friction.

    Additional In-line Sensors

    Acoustic emission for detecting the onset of cracks. ECR measures surface resistance changes to gain more insight on the film thickness.

    Liquid Containers, Sample Holder

    Customizable liquid and sample holders for standard and non-standard tests. 

    Features

    Next Generation

    With stroke control from 10 µm, the Rtec Instruments SRV tester simulates many test conditions that are not possible using any other commercially available tester.

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    Traceable Friction Force

    Calibrated friction force sensors to NIST traceable standards. This ensures correct absolute friction values.

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    Platform Rigidity

    Vibration dampening frame, symmetrical design, and rigid samples holders yield a high system stiffness. This high rigidity facilitates the high repeatability of data and wear marks with ease.

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      Reliability On Long Runs

      The unique flexure suspension guides the magnet assembly without contact or lubrication. Furthermore, the design eliminates performance degradation over time. Instead, It delivers near maintenance free operation.

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      Stroke control

      Ultra precise stroke control allows simulation of many applications. Including studying oil starvation areas and fretting regimes.

      Choose Your Model

      Choice Depends On Multi Function vs. Single Function

      Fretting tester from Rtec instruments model FFT-1
      Single Function Tribometer SRV Tester

      Dedicated SRV tester for reciprocating friction and wear analysis

      Universal tribometer MFT-5000 by Rtec Instruments
      SRV Test on Multi Function Tribometer MFT-5000

      SRV test on the MFT-5000 allows several other friction, tribology, wear tests on the same platform.

      Data and Analysis

      Custom and ASTM Standard Tests Available

      srv test ball scar image using 3D optical microscope
      Ball Wear Mark and Volume Wear

      3D wear mark of ball surface after the test.

      srv friction force and down force data on Rtec tribometer
      Real Time Friction and Downforce

      Real-time friction and downforce data

      srv test down force and displacement data
      Real Time Stroke Control

      Real-time downforce and stroke control.

      Table 1: COF values at different time intervals
      Test COF_15 min COF_30 min COF_90 min
      Test 1 0.061 0.0588 0.0589
      Test 2 0.060 0.059 0.061
      Table 2: Wear Scar Diameter (mm)
      Specimen Test 1 Test 2
      Ball Horizontal 0.4780 mm 0.4233 mm
      Ball Vertical 0.4978 mm 0.4083 mm
      Disk Horizontal 1.348 mm 1.336 mm
      Disk Vertical 0.4273 mm 0.4380 mm

      Several Applicable Standards 

      ASTM D5706
      Standard Test Method for determining extreme pressure properties of lubricating greases using a high-frequency, linear-oscillation test machine 
      ASTM D5707
      Standard Test Method for measuring friction and wear properties of lubricating grease using a high-frequency, linear-oscillation test machine
      ASTM D6425
      Equivalent to DIN 51834 part 2, Standard test method for measuring the friction and wear properties of EP lubricating oils using the SRV test machine
      ASTM D 7217
      Standard Test Method for Determining Extreme Pressure Properties of Solid Bonded Films Using a High Frequency Linear Oscillation SRV Test Machine
      ASTM D7420
      Standard Test Method for Determining Tribomechanical Properties of Grease Lubricated Plastic Socket Suspension Joints Using a High-Frequency, Linear-Oscillation  Test Machine
      ASTM D7594
      Standard Test Method for Determining Fretting Wear Resistance of Lubricating Greases Under High Hertzian Contact Pressures Using a High-Frequency, Linear-Oscillation Test Machine
      DIN 51834-1
      Tribological test in the translatory oscillation apparatus Part 1: General working principles
      DIN 51834-2
      Tribological test in the translatory oscillation apparatus Part 2: Standard test method for measuring the friction and wear properties of EP lubricating oils
      DIN 51834-3
      Tribological test in the translatory oscillation apparatus Determination of tribological behavior of materials in co-operation with lubricants
      DIN 51834-4
      Tribological test in the translatory oscillation apparatus Testing the tribological performance of gear and hydraulic fluids
      DIN 62136-1
      Textile machinery and accessories – Needle and sinker lubricating oils for weft knitting machines
      ASTM D7421
      Standard Test Method for Determining Extreme Pressure Properties of Lubricating Oils Using High-Frequency, Linear-Oscillation  Test Machine
      DIN 51834-5
      Standardization project in the automotive sector
      DIN 51834-6
      Standard Test Method for Measuring Friction and Wear Properties of Lubricating Grease Using a High-Frequency, Linear-Oscillation Test Machine
      DIN 51834-7
      Standard Test Method for Determining Extreme Pressure Properties of Lubricating Greases Using a High-Frequency, Linear-Oscillation  Test Machine
      DIN 51834-8
      Tribological test in translatory oscillation apparatus of bonded solid films DIN 51834-9 Evaluation of plastic greases with plastic specimens

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