概述：
硬度测量仪Newton Hardness Tester又名牛顿笔，由德国Robert Bosch GmbH发明，设计用于精确地测量和记录各种硬度（如各种涂层的硬度、塑料、木材或者金属等材料表面的硬度），测量表面可为平面或曲面，且不论大小。该仪器携带方便，可装在口袋中，适用于各种场合。
设计：
仪器内装一个可调压力的弹簧，压力由滑杆控制，弹簧作用于一个碳化钨测试头上面，通过定位螺丝固定滑杆，以保证恒定的压力，可选择四种不同压力的弹簧0－40N（4000g），对应刻在笔上的刻度，四种压力量程包括：
0－3N （0－300g） （蓝色） 间隔：0.1N（10g）
No.2 0－10N（3－1000g） （黄色） 间隔：0.5N（50g）
No.3 0－20N（0－2000g） （红色） 间隔：1N（100g）
No.4 0－40N（0－4000g） （白色） 间隔：2N（200g）
每一根与压力量程对应的弹簧具有与刻度相应的颜色代码
测试方法：
通过滑杆可设置估计或已知弹簧压力。将仪器垂直放在测试表面，以10mm/秒的速度划一条5－10mm的直线。测试头会产生一条仅肉眼看得见的划痕。如果弹簧压力太高，划痕会很清晰，如果弹簧压力太低，将没有划痕出现。通过锁定滑杆每次可以控制所需的压力，单位为牛顿或克（Newtons or g）。
保养事项：
每次使用完应注意保持清洁。如需清洁，先松开螺母，拆下刻度笔，用软布清洁测试头、笔杆和孔。如长时间不用时可在各部件涂上一层保护油，放置于随仪器的盒子内，并注意滑杆应设于零位以保护弹簧的精确度。
技术数据：
压力弹簧：弹簧钢
测试头：合金钢
测试头直径：0.75mm（Bosch）； 1.0mm（符合ISO1518和DEF）； 0.5mm（van Laar和Opel）
长度：160mm
直径：16mm
重量：约250g
订购信息：
型号 名称
810 硬度测试仪（牛顿笔）
标准配置：
硬度测试仪（含0.75mm测试头）、三根压力弹簧0－20N、证书、说明书、塑料盒；
选配件：
型号 名称
811 测试头（0.5mm）
812 测试头（0.75mm）
813 测试头（1.0mm）
814 压力弹簧（0－3N）
815 压力弹簧（0－10N）
816 压力弹簧（0－20N）
817 压力弹簧（0－40N）
PURPOSE AND APPLICATION
Modern manufacturing processes require efficient testing methods. Speedy, straightforward, accurate. Every time. Everywhere.
This instrument has been designed for the measurement of the hardness of protective coatings. The degree of hardness of paint films, plastic coatings. etc. can be accuray measured and recorded with the Newton Hardness Tester, Model 810. no matter whether on a level or curved surface, small or large.
The instrument is always ready for use. It is carried in the pocket, an asset which will be appreciated by all concerned with hardness tests.
Uniform hardness and quality of the coating facilitate smooth-running manufacture. Deviation from a specified hardness causes rejects, delay in production an complaints. Developed by ERICHSEN, the instrument permits regular quality control of protective coatings, even during processing.
The Newton Hardness Tester provides the engineer, foreman, inspector and others with a test instrument that satisfies the requirements of smooth production runs.
TEST PROCEDURE USING MARKING PINS NOS.1,2 ,3 and 4
The handing of the Newton Hardness Tester, Model 810 is extremely simple. The estimated or known spring tension is set with the help of the slider. Holding the instrument upright and placing its point on the test surface on draws a 5 to 10 mm long line at a rate of approximay 10mm/sec. the stylus should produce a scratch which is just visible with the naked eye. If the spring pressure is too high, the scratch is clearly visible: if too low, no scratch appears. By locking the slider every time one can control the applied pressure which is marked in Newtons.
Four scales are engraved into the pencil for the three pressure ranges:
0-3 N （0－300g） （blue mark） space: 0.1N（10g）
0-10 N（3－1000g） （yellow mark） space: 0.5N（50g）
0-20 N（0－2000g） （red mark） space: 1N（100g）
0-40 N（0－4000g） （white mark） space: 2N（200g）
The spring for each of the pressure ranges are colour coded and the corresponding scale is marked in the same colour
TEST PROCEDURE USING MARKING PIN NO.4
The marking pin in accordance with Opel （0.5 mm dia.） has got a special tip geometry and a length that exceeds that of the other marking pins by approx.. 5 mm. in order to exert the pressure preset by the clamped slider, onto the marking pin the latter must be pressed into the test rod by appprox. 5 mm during the test.
CARE AND MAINTENANCE
No further maintenance is required, because of the plastic bearings used for the construction of the instrument. For the purpose of cleaning removes the engraving pencil. Rod and bore are then cleaned with a soft cloth.
Although the Newton Hardness Test, Model 810 is of sturdy construction, the stylus point does not tolerate heavy blows. When not in use, the slider should be set to zero for preserving the accuracy of the springs.
Technical data
Compression Springs: spring steel
Marking pins
Nos. 1, 2 and 3: tungsten carbide spheres
No. 4 spring steel
With special tip geometry
Stylus point dia. :
No. 1 0.75 mm （Bosch）
No. 2 1.0 mm （to relate to ISO 1518 and DEF）
No. 3 0.5 mm （Van Laar）
No. 4 0.5 mm （Opel）
Total length: 160 mm
Diameter: 16 mm
Weight, net: approx. 250g
