YYU series strain-gauge axial extensometer for universal testing machines, measuring specimen elongation for modulus and strain data.
Overview
The YYU series is a strain-gauge axial extensometer a key accessory for universal testing machines. Its upper and lower knife edges are clipped onto two gauge-mark lines on the specimen; the deformation during tension bends an elastic element bonded with strain gauges, producing a mV signal proportional to strain, which the machine amplifier acquires and displays in real time as strain, Young's modulus E, proof strength Rp and elongation. In the model designation the numerator is the maximum extension (mm) and the denominator the gauge length (mm). YYU-10/50 has a 50mm gauge length and 10mm maximum extension, accuracy class 1, and is used in tension/compression/bending tests of metallic and some non-metallic materials.
Applications
• Road and highway engineering laboratory testing
• Construction material quality control and acceptance
• Research and teaching laboratories
• Third-party inspection and certification bodies
Features
• High measurement accuracy with stable repeatability
• Large LCD display showing real-time test parameters and results
• Robust construction suitable for both laboratory and field use
• Compliant with relevant Chinese and international testing standards
• Complete with calibration certificate and operation manual
Technical Specifications
| Item | Specification |
| Type | axial, strain-gauge |
| Gauge length | 50mm |
| Max extension (stroke) | 10mm |
| Accuracy class | Class 1 (≤±0.5%FS) |
| Gauge resistance | 350Ω |
| Bridge voltage | ≤6V (DC or AC) |
| Output sensitivity | approx. 2mV/V |
| Range available | gauge 20–600mm; extension 5–25mm |
| Grip | spring-clamp onto specimen |
| Signal connector | D-Sub 9-pin |
| Used with | microcomputer-controlled UTM / strain amplifier |
| Dimensions | approx. 180×140×80mm |
| Weight | approx. 0.5kg |
| Materials | metallic and non-metallic tensile tests |
| Standard | GB/T 12160 extensometer calibration |
Standards
GB/T, JTG, ASTM
Standard Delivery
• Main instrument unit
• Power cable
• Operation manual
• Spare parts kit
FAQ
Q1: What standards does the YYU Series Electronic Axial Extensometer comply with?
A1: The YYU Series Electronic Axial Extensometer is designed and manufactured in accordance with relevant Chinese national (GB) and transport industry (JTG) standards, as well as applicable ASTM and AASHTO international standards. A calibration certificate traceable to national standards is provided with each unit.
Q2: How often should the YYU Series Electronic Axial Extensometer be calibrated?
A2: We recommend annual calibration by authorized technicians or by iRoad after-sales service center. For high-frequency laboratory use, semi-annual calibration is advised. The instrument is supplied with a factory calibration certificate.
Q3: What is the lead time and do you provide training?
A3: Standard units are usually shipped within 7-15 working days. Custom configurations may require 20-30 days. iRoad provides on-site installation, commissioning and operator training for major equipment; remote video guidance is available for standard laboratory instruments.
Overview
The YYU series is a strain-gauge axial extensometer a key accessory for universal testing machines. Its upper and lower knife edges are clipped onto two gauge-mark lines on the specimen; the deformation during tension bends an elastic element bonded with strain gauges, producing a mV signal proportional to strain, which the machine amplifier acquires and displays in real time as strain, Young's modulus E, proof strength Rp and elongation. In the model designation the numerator is the maximum extension (mm) and the denominator the gauge length (mm). YYU-10/50 has a 50mm gauge length and 10mm maximum extension, accuracy class 1, and is used in tension/compression/bending tests of metallic and some non-metallic materials.
Applications
• Road and highway engineering laboratory testing
• Construction material quality control and acceptance
• Research and teaching laboratories
• Third-party inspection and certification bodies
Features
• High measurement accuracy with stable repeatability
• Large LCD display showing real-time test parameters and results
• Robust construction suitable for both laboratory and field use
• Compliant with relevant Chinese and international testing standards
• Complete with calibration certificate and operation manual
Technical Specifications
| Item | Specification |
| Type | axial, strain-gauge |
| Gauge length | 50mm |
| Max extension (stroke) | 10mm |
| Accuracy class | Class 1 (≤±0.5%FS) |
| Gauge resistance | 350Ω |
| Bridge voltage | ≤6V (DC or AC) |
| Output sensitivity | approx. 2mV/V |
| Range available | gauge 20–600mm; extension 5–25mm |
| Grip | spring-clamp onto specimen |
| Signal connector | D-Sub 9-pin |
| Used with | microcomputer-controlled UTM / strain amplifier |
| Dimensions | approx. 180×140×80mm |
| Weight | approx. 0.5kg |
| Materials | metallic and non-metallic tensile tests |
| Standard | GB/T 12160 extensometer calibration |
Standards
GB/T, JTG, ASTM
Standard Delivery
• Main instrument unit
• Power cable
• Operation manual
• Spare parts kit
FAQ
Q1: What standards does the YYU Series Electronic Axial Extensometer comply with?
A1: The YYU Series Electronic Axial Extensometer is designed and manufactured in accordance with relevant Chinese national (GB) and transport industry (JTG) standards, as well as applicable ASTM and AASHTO international standards. A calibration certificate traceable to national standards is provided with each unit.
Q2: How often should the YYU Series Electronic Axial Extensometer be calibrated?
A2: We recommend annual calibration by authorized technicians or by iRoad after-sales service center. For high-frequency laboratory use, semi-annual calibration is advised. The instrument is supplied with a factory calibration certificate.
Q3: What is the lead time and do you provide training?
A3: Standard units are usually shipped within 7-15 working days. Custom configurations may require 20-30 days. iRoad provides on-site installation, commissioning and operator training for major equipment; remote video guidance is available for standard laboratory instruments.
