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 down force

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

The  SRV tester comes fully automated and computer controlled. The setup is easy to calibrate and comes with standard oil and samples. It not only runs several standard test methods but also allows to create new custom methods for future petroleum product standards.

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Fretting tester from Rtec instruments model FFT-1

SRV Test Machines Like No Other

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

Down Force Control

Real time down force control.

Voice Coil

Electromagnetic actuator to impart linear reciprocating motion. Dependent on the test optional additional coils 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). Close 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. The coil controls the stroke by monitoring smallest of increments of waveform change.

Piezo Friction Measurement

The tester comes 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 to detect 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. The design eliminates performance degradation over time. It delivers near maintenance free operation for a long time.

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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 down force  data

    srv test down force and displacement data
    Real Time Stroke Control

    Real-time down force and stroke control.

    Table 1: COF values at different time intervals
    TestCOF_15 minCOF_30 minCOF_90 min
    Test 10.0610.05880.0589
    Test 20.0600.0590.061
    Table 2: Wear Scar Diameter (mm)
    SpecimenTest 1Test 2
    Ball Horizontal0.4780 mm0.4233 mm
    Ball Vertical0.4978 mm0.4083 mm
    Disk Horizontal1.348 mm1.336 mm
    Disk Vertical0.4273 mm0.4380 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
    Universal tribometer MFT-5000 by Rtec Instruments

    Need Versatile SRV Testing?

    Check out the Multi Function Tribometer SRV model.

    Fretting tester bench top from Rtec Instruments model FFT-M

    Need HFRR Testing?

    Take a look at Rtec’s Bench Top HFFR Tester, the FFT-M

    Want to learn more?

    Get in touch, and request a demo.