| As the resistance change of strain gauges is extremely small, it is indicated or recorded by means of an amplifier, except for special cases and semiconductor gauges. The strain meter is designed to convert the small resistance change of the strain gauge into a voltage output, amplifying it to output either digital or analog data. TML provides various types of strainmeters for static and dynamic strain measurements. Histogram recording systems are also specially designed for analyzing the frequency distribution of various phenomena that accompany strain gauge measurement.
The strain characteristics in strain measurement are classified into static, dynamic or a combined behavior according to the rapidity of the phenomena. Static strain varies slowly or not at all with time, while dynamic strain oscillates with time. As strainmeters are designed specifically for such strain performance, it is important to determine the appropriate strain type in order to select the correct strainmeter. |
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| Static strain remains constant during measurement, and the strain can be converted to digital values. Furthermore, for multi-point measurement, one unit of instrument makes automatic switching possible. The TML Data Logger is a typical static strainmeter and can measure a maximum of 1.000 points at high speed by cascading automatic switching boxes. It also features a number of processing functions. The TML digital indicator and instrumentation signal conditioner are in same field of instruments for strain gauge type transducers. | Dynamic strain varies with time and their data are converted to analog output signals. The measured strain is amplified by the dynamic strainmeter and output to an external recorder. One strainmeter is required for each measurement point. Using a processing unit such as an A/D converter, digital data can be output and saved in memory, then transferred to computer. The TML digital dynamic strainmeter is compatible with this architecture. The histogram recorder system is specially designed to measure a frequency distribution of dynamic strains. |
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Strainmeter selection
TML strainmeter is classified in 4 types:
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| TDS-303 |
StaticStrainmeter |
10 single |
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voltage thermocouples Pt-100 (RTD) |
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Digital data (Memory, FD, Interface) |
| SDA-810/830 |
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| HR-Serie |
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| Tracker |
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Example application:
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