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.

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

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.

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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

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