非接触式汽车速度计校准装置说明书

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非接触速度测试仪

非接触速度测试仪
非接触速度测试仪是用来检测机动车运动性能的仪器，该仪器有主机、非接触速度传感器、线缆三部分组成。

非接触速度传感器通过光学系统采集路面的信号，通过电子系统转换成速度信号传给主机；主机接受传感器的速度信号，通过计算得到各种信息，包括滑行、制动、加速、稳定车速等方面的详细信息，从而判断机动车的性能。

该仪器配备先进的非接触速度传感器，传感器是通过发出光到地面上，然后通过分析反射的光线得到机动车的速度，传感器具有安装操作简单，精度高等特点。

主机显示采用大屏幕液晶，可以实时显示速度、时间、曲线等参数；系统带有存储功能，可以存储检测结果；配有微型打印机，可以打印结果，配有计算机连接接口，可以与电脑连接0
该仪器适用于汽车产品质检部门、汽车综合性能检测线、汽车拖拉机生产厂家、大中专院校、农机检测部门、交通科研部门等。

OES非接触光电速度传感器

OES-Ⅱ非接触式光电速度传感器使用说明书一、基本原理、优点及使用范围在道路现场进行高精度测量汽车速度，行驶距离和对汽车进行加速、制动和滑行考核，历来均采用五轮仪。

五轮仪较为坚固，操作方便，价格适中，在低中速范围能较好满足测试需要，但当速度高于100公里/小时时，路面稍许不平会引起轮盘跳动打滑，从而带来测量误差。

而且五轮仪重量较重，特别对小型汽车成为一负载，限制了车速，因此五轮仪不能满足小型车辆高速段的测试要求。

OES-II型非接触式光电传感器采用特殊的大面积硅光电器件作探测器。

使用时将仪器安装在汽车外侧，镜头对准用灯光照明的地面。

汽车行驶时，地面的杂乱花纹经光学系统成像，并扫描过硅光电器件，经过光电转换和空间滤波后，传感器仅输出一随机窄带正弦波信号，信号的频率与车行速度成正比。

将传感器输出的信号经TRF型带通跟踪滤波器滤波和整形后，转换为标准TTL脉冲输出，每一脉冲严格对应汽车相对地面走过的一段距离。

将输出信号经过计数和微机处理后就可实时显示车行速度、路程、加速度和经过时间，并可将数据进行存储和打印。

OES-II光电传感器和TRF型跟踪滤波器在测量精度上比五轮仪高出了一个数量级，在灵敏度、测量范围等性能上超过国外同类产品。

传感器对不同类型的道路灵敏度相同（日本产品需手动调节放大器增益），在晴天阳光直射（无阴影）的现场可不开灯进行高精度测量，其光学系统设计独特，汽车上下颠簸不影响测量精度。

仪器响应极快，可有效测量汽车加速度和制动过程（日本产品不能有效测量＞0.6g的急速变化过程），同时设有白线信号输出，用户在现场可方便进行高精度自校。

OES-II光电传感器和TRF型跟踪滤波器可靠性极强，特别适用于汽车、拖拉机和摩托车外场路面行驶性能的高精度测试，由于其采用非接触原理测量，还适用于火车、钢板、编织布等运动目标的高精度测速测长。

该产品荣获91年中国汽车工业科技进步二等奖和92年国家科技进步三等奖。

二、 OES-Ⅱ光电传感器技术指标●输出波形：正弦波（>0.1Vp-p）●测速范围： 0.5～250公里/小时●对应频率： 35HZ～17.5KHZ●周期当量： 4mm/1周期或10mm/1周期●照明灯功率： DC12V、55w●光学视场： 50mm×60mm●工作距离：照明灯距地面约600mm探测头前端距地面约500mm●高差影响：工作距离在500±100mm内，测量误差2%●其他功能：有白线信号输出●尺寸重量： 86mm×94mm×260mm，重2.5公斤三、使用说明1、传感器安装使用方法OES-II光电传感器在灯座侧面有四个M8安装螺孔，使用时将传感器用螺栓安装到真空吸盘支架上，吸盘吸附于汽车前端或后端车体上，并且要防止汽车开行时传感器有较大幅度的抖动，或汽车制动时产生变形、移位或甩动，否则混入附加信号影响测量精度，用吸盘支架安装时，不要忘记用保险绳缚牢，防止吸盘松脱产生意外。

非接触式汽车速度计校准装置研制

靠真空吸盘固定在被测试车的车身后部或侧面。光
经济发展的重要决策之一。从世界先进工业国家的
发展经验可知，展汽车工业会促进整个社会经济发的发展。因为汽车工业的发展必然会带动和促进钢铁、色金属、胶、油、子、工及玻璃等许多有橡石电化
求
根据我国改革开放经济发展的形势，八五规从划开始把汽车工业作为支柱产业，推动整个社会是
非接触式汽车速度计是第五轮的换代产品，它
是以计算机为核心部件，以相应的ＩＯ接口，配／采用光电头相关滤波技术。光电头（间频率传感器）空
及研制作为国内首创的新型校准装置的工作原理、术参数、量不确定度及实际校准非接触式汽车速度计的实技测
验结果。目前已开展对非接触式汽车速度计的校准工作。
【关键词】非接触式汽车速度计；校准；测量不确定度１前言
电头是一种特殊的传感器，从路面上的小石块、可砂
粒、油路面的各种粒子或轮胎印在路面上的不规柏
工业的发展。汽车工业每增加一个产值单位，定必
会带动其它工业增加三个产值单位。而且，车工汽
Ⅲ 一
ＪＧ（Ｊ汽车）２５汽车速度计》０ —９｛。根据《汽车速度计》规程要求

基于PIC的非接触式车速计校验装置

维普资讯
２０８在０
仪表技术与传感器
ＩｓｒｍｅｔＴｅｈｑａｄＳｓｒｎｔｕｎｃｎｉｕｅｎ．
第２期
基于ＰＣ的非接触式车速计校验装置Ｉ
ｒｌｂｌｙｅｉｉｔ．Ａｅｏｔｌｔｔｇｍｅｇｄａｔｒｒｓａｃ．Ｂｈｆｃｅｔｏｐｒｔｎｂｔｅｅｓｎｈｎｓｃｍｏｏｄｔａｓａｉｎｗｃｎｏｒｅｙｅｒｅｆｅｅｅｒｈｒｓａｙｔｅｅｉｎｏｅａｉｅｗｅｎｔｙｃｒｉｔｔｒａｎ — ｉｆｃｏｈｏｉｎｒｄｃｒｈｒｄｃｉｎｃｎｉｏｅａｏｔｌｂｅｒｃｓｎｔａｙｕｅ，ｔｅｐｏｕｔｏｄｔｎｂｃｍｅｃｎｒｌｌ，ｐｅｉｅａｄｓｄ．ＵｉｇｔｅＰＣｃｍｐｔｒｓｔｅｃｒｆｔｅｗｈｌｃｎｒｌｏｉｏａｅｓｎｈＩｏｕｅｈｏｅｏｏｅｏｔａｈｏ
ＳＥｉｇｌｎ，ＨＮＷｅｊＨＮＸｎ — ａｇＳＥｉｉｉ－ｅ
（ｏｌｅｏｌｔｏｉＥｅｔｉｌｎｉｅｒｇｈｎｈｉｉｅｓｙｏｎｉｅｒｎｃｎｅＳａｇａ２１２，ｈｎ）Ｃｌｇｆｅｒｎｃ＆ｌｒａＥｇｎｅｉ，ＳａｇａＵｎｖｒｉｆｇｉｇＳｉｃ，ｈｎｈｉ０６０ＣｉａｅＥｃｃｃｎｔＥｎｅ
沈行良，沈蔚杰
（海工程技术大学电子电气工程学院，海上上２１２）０６０

非接触式汽车速度计校准装置的校准与不确定度评定

披触
Ｍ
●
１ｉ述瞍汁饺准装竹：为校准速度
永伉量： ≤ ５０ｋｍ／ｈ５０ｋｍ／ｈ：超过ｏ．２０；
巡过 ±０．１０ｋ１ｎ，ｌ１；：
汁的设备．随我Ｉ汽ｒ的发腱和汽１ｔ保有ｇ急刷埘ＪＪＩ］干 ¨ 刈１ｔ奠ｒｆ：的要求，其汁艟性能指标
校准点为例分析确定度：
一
＿１＿
…
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（１）
巾：、Ｖ
线速蓐．；标准装的线述爪ｆｆ【．ｋｎｈ；
Ｖ
１１：
线速度怀准ｆｆ［的３次平均似．ｋｍＪ州丰，取３．１ｌ１６：ｎ实测仇．ｎｌＦＩ￣．；３次转速洲ｆ『ｆ的均．ｒｍｉｎ。
摘要：介绍了非接触式汽车速度计校；仨装置２￣－作原理以及校；住装置的线速度校准及示值误差洌
量站装的不确定度评定
关键词：计量学；非接触式汽车速度计：校；住；测量不确定度中图分类号：Ｉ＇１￣，９３ — １文献标识码：Ａ文章编号：１００７６９２１（２Ｏ１７）１２（）（）８２ｏ２
动、电儆ｆ扰等索。：｛测量标准计量特性川ｒ洲：｝的汁．』Ｌ技术指

安卓基于非接触电梯超速保护仪器速度测量系统说明书

3rd International Conference on Mechatronics and Information Technology (ICMIT 2016) Android-based non-contact elevator overspeed governor speedmeasuring systemXu Chen1, a,Xiangdong Li2,b1NO.107,longjiang building, caochangmen street, gulou district, nanjing city, jiangsu province,China2 NO.107,longjiang building, caochangmen street, gulou district, nanjing city, jiangsuprovince,Chinaa*****************,b***************Keywords: Elevator overspeed governor, Rotational speed measurement, OpenCV, Android. Abstract.With the rapid development of technology, intelligent mobile phone hardware performance improving. Meanwhile, the openness of Android system is also conducive to the development of software.Therefore this paper proposes a elevator overspeed governor speed measuring system based on Android Smartphone, using the mobile phone camera and OpenCV image processing technology for non-contact speed measurement, it not only reduces the existing test instruments volume and production cost, but also increases its reliability.IntroductionElevator speed limiter is one of the important safety parts of the elevator, when the elevator operation of the car for various reasons to occur when speeding or even fall can make the elevator safety stop. So the elevator speed limiter need to be checked regularly to verify.its performance is reliable. Currently, the elevator speed limiter is mainly through the elevator speed limiter calibration instrument. It by driving the elevator speed limiter roulette, to its simulation movement speed.Test record at this time of the movement speed, compared with the rated speed, can judge whether the speed limiter functions in good condition. Visible, the speed limiter wheel speed detection, is the key to the whole instrument.Speed measuring method of traditional elevator speed limiterAt present, the speed measurement methods of the speed limit device of the elevator include contact measurement and non-contact measurement.Contact speed measurement methods need to be speed measuring device with rotating speed wheel direct contact with the measured speed. Common types include speed wheel and encoder type two kinds.Non-contact speed measurement methods should first marker on the wheel speed limit preset, through calculating unit time read marker number calculates the speed sensor.According to different sensors, the common hall type and photoelectric type two kinds.However, the existing elevator speed limiter calibration instrument no matter what kind of measurement method, all need independent sensor device, so as to lead to the volume of the instrument becomes greater.With the rapid development of the embedded operating system and the hardware of the mobile intelligent terminal, the test instrument system based on the mobile terminal will gradually become a developing trend. This paper proposes a video speed measuring method based on Android smartphones, via cell phone cameras can detect speed without the need for other devices. Has the advantages of small size, convenient operation, anti-interference, etc..Video speed measuring principleVideo speed measuring method for rotating object, the usual approach is to refine the image to be a mark line, by calculating the angle difference and time difference of the mark line in the two framepicture, the speed of the object is obtained. This method has the advantages of high measurement accuracy, but the algorithm is complex, has certain requirements of mobile hardware.Due to the low general speed elevator speed limiter, this paper proposes a simplified video speed measuring method. The principle base on the non-contact photoelectric measuring method of rotational speed of similar, wheel speed limit in the upper part of post some reflective logo, mobile phone camera capture speed round rotating multiple pictures, by comparing to the adjacent two photos to judge whether to revolve, accumulated per unit time by the number can be calculated RPM (revolutions per minute).Therefore, this system is mainly divided into frame image acquisition, image processing, calculation speed and other steps, the system function module is shown in Fig.1.Fig.1 System function module Software design The main functions of the system software is to obtain the image, image processing and calculation speed.Software development environment: Java SDK+ Eclipse +ADT+CDT+OpenCV 2.4.4 +Android SDK.Video processing involves a large number of complex algorithms, which will increase the difficulty and workload of software development. OpenCV is a class of C and C++ language source code files, these source code files to achieve a number of commonly used computer vision algorithm. So in the software development just calls the corresponding source code, and no longer need to write code to achieve the function. This greatly reduces the difficulty of the preparation of software, especially since the 2.3 version of the OpenCV Android platform for the Java interface to facilitate the development and use of Android.Image acquisition. Image acquisition is the actual access to the application of Camera Service. Through it can handle the data captured by the camera. It can be set by the Android list file in the call camera hardware and SD card read and write permissions. The code would look like the following. Camera permissions:<uses-permission android:name="android.permission.CAMERA"/>SD card read and write permissions:<uses-permissionandroid:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /><uses-permissionandroid:name="android.permission.WRITE_EXTERNAL_STORAGE"/>In order to reduce the influence of operating personnel manual, the display area was designed the viewfinder frame layer for reference of the tester shown in Fig. 2, to reduce the artificial shakingwhile operating.Fig.2 The image acquisition interfaceThe image processing. The first is the image gray scale processing. The simplest way is to use "CV_LOAD_IMAGE_GRAYSCALE" function, it can be directly in loading the image processing, the resulting image is a single channel. This code is shown below.IplImage* Igray=cvLoadImage("test.jpg",CV_LOAD_IMAGE_GRAYSCALE)The second step is image binarization processing, image binarization is an important technology in image preprocessing, which set a certain threshold of the gray level image pixels into is greater than the threshold value of pixels and less than the threshold value of the pixel group of two parts. Its function is:≥<=threshold y x f threshold y x f y x g ),( 255),( 0),( (1) Thus, binarization image processing is gray image point set as 0 or 255, that is the whole image shows the obvious effect of black and white. This image set only with pixel value of 0 or 255 points, no longer involves the pixels of multistage value. So the process becomes simple. OpenCV provides a function " CV Threshold " for the use of a single channel array of fixed threshold operation, you can threshold operation of the gray image to get the two value image. The threshold is set to 254, as shown in Fig3 in the actual test.Fig.3 The image processingSpeed calculation. Speed measurement accuracy are inseparable with the number of frames, in theory, the more the number of images, the more accurate. However, due to the phone's hardware configuration restrictions, a large number of pictures will lead to the processing time is too long. At the same time, the general mobile phone video frames between 25 to 30 frames per second, so it take the number of frame graphics for 50 pieces of picture processing. Before calculating the speed need to handle 50 pictures, because the speed limit on the wheel attached to the reflective logo, after the image processing in front of the formation of a distinct black and white picture. When two adjacent frames are judged to be inconsistent, the meter is 1 circle. The program flow chart is shown in Fig.4.Fig.4 The program flow chartTwo adjacent frames can be judged by the function "CVAbsDiff" to do the differential operation, as follows.IplImage* pre=NULL;IplImage* curr=NULL;IplImage* diff=NULL;int Num=0;while(curr=cvQueryFrame(pCapture)){Num++;if(NUm==1){next=cvCreateImage(cvGetSize(curr),8,3);diff=cvCreateImage(cvGetSize(curr),8,3);cvCopyImage(curr,next);}else{cvAbsDiff(curr,next,diff);cvCopyImage(curr,next);}}The final software testing interface as shown in Fig.5.Fig.5 Software testing interfaceConclusionsIn this paper, the OpenCV image processing technology for Android mobile phone elevator speed measurement method of the speed measurement method was studied and discussed, the mobile terminal and speed measurement equipment is proposed to combine the idea of. Combined with other features on the Android phone, greatly reducing the current elevator speed limit device calibration equipment volume, but also reduce the cost of procurement.However, due to the limitations of mobile phone hardware and software is not perfect, the current system also has a low accuracy, can not measure a series of high speed and other issues, the need to further improve the improvement.References[1] Howse, J: Android Application Programming with OpenCV (Packt Publishing, England 2013).[2] Kazimierz Orlowski, Jakub Sandak, Chiaki Tanaka. The Critical Rotational Speed OfCircular Saw: Simple Measurement Method And Its Practical Implementations. Journal Of Wood Science, Vol. 53(5)(2007),p.388-393.[3] Ke Peng, Nianxiang Peng, Yanhong Chen: Computing Technology and Automation,Vol.29(1)(2010),p.76-79.(in Chinese)[4] Jiecheng Meng, Hong Lv, Yunsheng Deng, Defang Liu : Control & Automation,Vol.08(2012),p.155-156 .(in Chinese)[5] Yongli Huang, Xiao Wang, Meiyun Kong: Android application development complete studymanual(Tsinghua University press, China 2014). (in Chinese)。

非接触型、频率和转速传感器产品说明说明书

Connects to—Active transmitters for rotational speed with AC voltage output Type NM 510Type NMk 611—Non-contact, inductive pick-up sensors for rotational speed Type ENI 4, 5—Passive rotational speed sensors, HF pick-up sensors to DIN 19234Type ENI 11, 12—Opto-electronic pick-up sensors with pulse output Type ENI 21, 22, 23—Mechanical relay-actuated switches with NO contactsMeasuring span—0.1 Hz ... 20 kHz, parameterizable Output—0/4 … 20 mA or 10 V (optional), parameterizableElectrical isolation—Between input, output and power supplyHousing—Surface-mounting case, degree of protection IP 20 for mounting on top hat rails acc. to EN 50022—Environmentally ruggedized field housing, degree of protection IP 65, for mounting on siteTwo freely settable limit values—Change-over contacts with parameterizable response behavior (optional)Extended temperature range (optional)Parameterizable transmitter for frequency and rotational speed ENM 4Technical dataMeasuring methodProcessor controlled interpulse period measurement with automatically set meas. period. Minimum time selectable in steps of 5 ms...99 sec. Input2 alternatively usable input paths provided by basic device, with common zero, electrically isolated from the output and from the power supply. Response level for sensor with HF resonant circuit to DIN 19234, e.g. ENI 11, ENI 12 or optoelectric sensors e.g. ENI 21, ENI22, ENI 23. Trigger level8 V / 6 V (on / off), 50 kΩ impedanceSupply voltage8 V, Ri = 1 kΩ (ENI 11, ENI 12)Supply voltage18 V DC (max. 40 mA) ENI 21/22/23Response level for sensors with AC voltage or pulse signal,e.g. ENI4, ENI 5, NM 510, NMk 611in the range 50 mV…100 VTrigger level50 mV, 50 kΩ impedanceFrequency range0.1 Hz…20 kHz (parameterizable)Measuring sequencein steps of 5 ms…100 sec.Output0/4… 20 mA, parameterizablemax. load: 500 Ω, Imax 25 mA0…10 VImax 3 mA (optional)InfluencesLinearity error< 0.1 %, resolution 12 bitLoad< 0.1 %Pulse outputapprox. +10 V, Ri = 1 kΩPulse sequence1:1 with input signalProgramming and displayParameterizationVia 4 front panel keys, in group steps or individual steps,depending on the functionParameter access protectionThrough access code and in case of power failureDisplayIn programming mode, the display shows the individual program steps and parameter settings. In operating mode, the measured value and the selected engineering unit are indicated.Type of display8 digit LCD Safety instructions and precautions to DIN EN 61010 Test voltage input versus output500 VRated voltage versus ground1 kVDegree of pollution2Overvoltage category1Electromagnetic compatibilityto EN 50081 and EN 50082Limit values2 alarm signalling unitsmin./max. change over contactsSwitching voltagemax. 250 V DC/ACSwitching currentmax. 2 A AC, 1 A DCSwitching capacitymax. 100 W DC, 250 VA ACProgram selectionSwitching point with engineering unitSwitching hysteresis (acc. to width and position)Switching position with missing power supplySwitching position during startup bridgingPower supply18…40 V AC/DC85…265 V AC/DCPower consumption approx. 5 VAHousingEnvironmental capabilitiesAmbient temperature0…+50 °C; optional: 25…+65 °CStorage and transportation temperature40…+85 °CRelative humidity< 75 %, non condensingMechanical stress capabilitiesVibration9 gShock20 m/s²Surface-mounting FieldhousingMaterial Plastic, grey,RAL 7032built in surface mountinghousing, upper part madeof transparent Macrolon Protection IP 40 (housing)IP 20 (terminals)IP 65El. connections Screw terminals, max. 2.5 mm2Cable entry– 3 x PG 9Weight0.5 kg 1.3 kg23Dimensional drawingsConnection plansConnecting various sensors to the inputFunctional connections15High sensitivity input 1+ / L1Power supply18Zero2- / N168 volts across 1 k Ω4Make contact for startup bridging14High level input 518Zero8Message SP 1Contact in position of rest (device currentless)7617Sensor supply, 18 volts, max. 40 mA 11Message SP 2Contact in position of rest (device currentless)14High level input 1018Zero920Pulse output15High sensitivity input 18Reference point as on input18Zero12+Analog output13-ENI 4ENI 5ENI 11+ENI 12-ENI 21+ENI 22ENI 23-ENI 4ENI 5≈Ordering information10/14-2.23-E N R e v . A 01.2011Contact usNoteWe reserve the right to make technical changes or modify the contents of this document without prior notice. With regard to purchase orders, the agreed particulars shall prevail. ABB does not accept any responsibility whatsoever for potential errors or possible lack of information in this document.We reserve all rights in this document and in the subject matter and illustrations contained therein. Any reproduction, disclosure to third parties or utilization of its contents – in whole or in parts – is forbidden without prior written consent of ABB.Copyright© 2011 ABB All rights reserved3KDE470008R1001ABB Automation Products GmbH Process Automation Borsigstr. 263755 Alzenau Germany Tel:+49 551 905-534Fax:+49 551 905-555。

一种汽车非接触式速度计校准装置

专利名称：一种汽车非接触式速度计校准装置
专利类型：实用新型专利
发明人：牛国辉,叶小波,吴恩其,王东,郭叶明,赵志军,柳国强申请号：CN202122192881.X
申请日：20210910
公开号：CN215641344U
公开日：
20220125
专利内容由知识产权出版社提供
摘要：本实用新型公开了一种汽车非接触式速度计校准装置，包括矩形外壳、拉环、垫脚、第一固定板、第二固定板、液晶显示屏、电源、踏板开关接口、测速滚筒、滚筒工作面、驱动电机、支撑架、卡板和锁扣。

本实用新型的有益效果是：矩形外壳的左右两侧侧壁水平焊接固定有拉环，拉环前后左右呈对称式设置有四个，拉环上胶结有一层防滑手胶，使工作人员能够通过拉环将装置整体进行抬起移动，矩形外壳的顶部以及前表面的左半部分分别连接固定有第一固定板和第二固定板，第一固定板、第二固定板的底部两端均固定有卡板，并在其顶端转动连接有锁扣，锁扣与第一固定板、第二固定板之间固定有弹簧，使第一固定板、第二固定板与矩形外壳能够快速连接锁定以及拆分。

申请人：河北中航检测技术服务有限公司
地址：054000 河北省邢台市邢东新区龙岗大街汽车城二区18号-2
国籍：CN
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非接触式汽车速度计
校准装置
使用说明书邢台中测仪器设备有限公司
系统组成
非接触多功能速度测试仪检定装置控制系统由测试监控界面和参数设定界面两个画面组成，画面之间可以所以切换。

1 主界面
图1：主界面
系统上电后自动进入测试监控界面（图1），测试监控界面主要用于提供生产厂家的有关信息，设定和显示测试数据。

按下“参数设置”按钮，就会进入参数设置画面。

2 测试监控界面
系统上电后，系统进入测试监控画面（图2）。

该画面用于设置测试速度，微调速度和显示实时运行速度。

设定测试速度后，按下“速度确认”按钮，确认设定速度。

按
下“启动”按钮，系统将按从零加速到设定速度，然后保持在设定速度匀速运行，如果需要变更测试速度，只需在“速度设定”处重新输入需要的速度值，然后按“速度确认”按钮，系统将自动加速或减速到新确认的测试速度。

速度微调，在“速度微调”处输入需要微调的速度，然后按下“上”或“下”按钮，速度测试仪将在原来的速度上增快或减慢微调速度值。

运行速度显示速度测试仪的实时运行速度。

运行时间显示的是速度测试仪运行的总时间。

图2 排料参数设置
需要调整参数时，按下相应数字框，弹出数字键盘（图3），输入需要的数字后，按下‘Enter’键完成设置，按下右上角的‘X’键取消设置。

图3参数设置数字键盘
3 参数设置界面
在测试监控界面按下参数设置按钮，系统进入参数设置界面（图4）。

参数设置界面主要参数如下：
圆盘直径：速度测试仪圆轮的直径，此参数在出厂时已设置好，一般不用再进行设置。

加减速时间：速度测试仪从零加到最高速和从最高速降低到零的时间。

参数设置方法同测试监控界面的操作方法。

图4 参数设置界面。