Hewitt G B, Withers R T, Brooks A G, Woods G F, Day L A
Exercise Physiology Laboratory, School of Education, Flinders University, Adelaide 5001, Australia.
Am J Hum Biol. 2002 Nov-Dec;14(6):721-7. doi: 10.1002/ajhb.10087.
This article describes an improved rig for the dynamic calibration of skinfold calipers. The new unit is 5% lighter and almost 60% smaller than its predecessor (Carlyon et al., 1996, 1998) with a 9.5 mm solid aluminium base and a quick release caliper mount providing stability to both the rig and caliper. Automation of the gap controller with an electric motor standardizes the jaw opening and closing velocity, thereby enabling hands-free operation. Frictional losses in the moving components of the rig have been reduced by replacing the main bush of the swing arm with a bearing, reducing the mass of the swing arm, adding a support wheel to the end of the swing arm, and replacing fishing swivels with a universal joint to allow for changes in the opening screw angle as the caliper's arm moves through its arc. This rig can also be adapted to different types of calipers by changing the position of the load cell, microswitches, and the caliper mount. A universal mounting bracket that can be secured to almost any table supports the rig in a vertical plane when calibrating the load cell. To demonstrate the versatility of the calibration rig, preliminary data are presented for the upscale and downscale jaw pressures of seven Harpenden and seven Slim Guide calipers.
本文介绍了一种用于皮褶厚度计动态校准的改进装置。新装置比其前身（Carlyon等人，1996年，1998年）轻5%，体积小近60%，具有9.5毫米厚的实心铝制底座和快速释放卡尺支架，为装置和卡尺提供稳定性。间隙控制器采用电动马达实现自动化，使钳口开合速度标准化，从而实现免手动操作。通过用轴承替换摆臂的主衬套、减轻摆臂质量、在摆臂末端添加支撑轮以及用万向节替换钓鱼转环以允许在卡尺臂通过其弧线时开口螺丝角度发生变化，减少了装置运动部件中的摩擦损失。通过改变称重传感器、微动开关和卡尺支架的位置，该装置还可适用于不同类型的卡尺。在校准称重传感器时，一个可固定在几乎任何桌子上的通用安装支架在垂直平面内支撑该装置。为展示校准装置的多功能性，给出了七台Harpenden卡尺和七台Slim Guide卡尺的向上和向下钳口压力的初步数据。
