Working principle of TR100 pocket surface roughness meter

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Agway (Shanghai) Testing Equipment Co., Ltd

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18611133071
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Floors 1-2, No. 2349 Changjiang West Road, Baoshan District, Shanghai

Date: 2025-12-11Read: 5

The TR100 pocket sized surface roughness meter is a precision instrument suitable for detecting the surface roughness of metal and non-metal parts under test. Its working principle revolves around surface contour acquisition, data processing, and result output. With scientific structural design and technical application, it can measure the surface roughness parameters of multiple workpieces.

1、 Core measurement mechanism

The core measurement function of the instrument is completed by sensor components. The sensor is equipped with a stylus, with a tip radius controlled at 10 μ m ± 1 μ m, a static force of ≤ 0.016N, a force change rate of ≤ 800N/m, and a sensor head pressure of ≤ 0.5N. This design ensures sufficient contact between the stylus and the surface of the workpiece without damaging it.

During measurement, the sensor scans at a constant speed along the surface of the measured workpiece (in various shapes such as flat, outer circular, conical, inner hole, etc.) according to the set sampling length (0.25mm, 0.80mm, 2.50mm optional), and the stylus will produce small displacements with the micro undulations of the workpiece surface. This displacement signal is converted into an electrical signal through a sensor, providing the original basis for subsequent data processing. During the scanning process, the instrument stroke length is fixed at 6mm, and the evaluation length can be automatically matched to 1.25mm, 4.0mm, or 5.0mm based on the sampling length to ensure sufficient surface area coverage and improve the representativeness of the results.

2、 Data processing flow

The electrical signal output by the sensor will be transmitted to the high-speed DSP processor built into the instrument. This processor has data processing capabilities and can quickly filter, amplify, analog-to-digital convert, and perform a series of processing on raw signals, including environmental interference and irrelevant signal effects.

Based on the processed signal, the processor calculates four core roughness parameters, Ra (arithmetic mean deviation of contour), Rz (contour height), Rt (total contour height), and Rq (root mean square deviation of contour), according to the GB/T350-5000 and GB/T6062-2002 standards. During the calculation process, the instrument strictly follows the set indication accuracy requirement (0.01 μ m) to ensure the precision of parameter calculation.

3、 Principles of Auxiliary Functions and Environmental Adaptation

(1) Calibration function: The instrument is equipped with nationally certified multi line optical glass calibration blocks, which are made of materials that are not easily scratched and have a long service life. When in use, establish a measurement benchmark through calibration operations, correct system errors, ensure the accuracy of long-term measurements, and meet the technical indicators of indication error (7-10)% and indication variability<12%.

(2) Low power consumption and battery life design: The instrument is powered by a 3.7V lithium-ion battery, combined with low-power software and hardware design and automatic shutdown function to extend working time; Supports two charging methods: charger and computer USB port, can work while charging, suitable for on-site and outdoor testing scenarios.

(3) Environmental adaptation mechanism: The instrument has undergone strict temperature and humidity tests, and its appearance adopts an aluminum mold design, which has strong electromagnetic interference resistance. It can work stably in environments with temperatures ranging from -20 ℃ to 60 ℃, relative humidity less than 90%, and no vibration or corrosive media, especially suitable for humid climates in the south.

(4) Display and operation: The dot matrix LED LCD display screen has the characteristics of high brightness, no viewing angle, and wide temperature adaptability. It can clearly display measurement parameters and results, and with simple operation logic, it is convenient for users to quickly complete measurement operations in various occasions.

4、 Overall workflow closed loop

After selecting the sampling length and measurement parameters according to the requirements of the tested workpiece, the user will attach the instrument sensor to the surface of the workpiece and start the measurement; The sensor scans and collects surface contour signals, which are processed and calculated by a DSP processor to obtain roughness parameters; The parameter results are output in real-time through the display screen, completing one measurement. The entire process does not require complex operations, and the instrument structure is sturdy (weighing only 200g, with dimensions of 106mm × 70mm × 24mm), making it easy to carry and use on site, achieving a complete working loop from signal acquisition, data processing to result output.

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