94U1D-T22-D12L,94U1D-T22-D12L pdf中文资料,94U1D-T22-D12L引脚图,94U1D-T22-D12L电路-Datasheet-电子工程世界

文档预览

VE S CO

AV R M

AI SIO PL

LA N IA

BL S NT

Features

■

Available in a variety of pin-out

conﬁgurations

■

Virtually inﬁnite electrical circuit isolation

■

Metal or plastic shaft options

■

RoHS compliant versions available*

Non-RoHS models are currently

available, but not recommended

for new designs. See

Product

Obsolescence Memo

for details.

Model 91, 92, 93, 94 & 95 - 5/8 ” Square Single-Turn Panel Control

Initial Electrical Characteristics

Conductive Plastic Element

Cermet Element

Standard Resistance Range

Linear Tapers (A, B, E, & H) .........................(B & E) 1 K ohms to 1 megohm ......................... (A & H) 100 ohms to 1 megohm

Audio Tapers (C, D, F, G, S, & T) .................(D,G,S, & T) 1 K ohms to 1 megohm ................. (C & F) 1 K ohms to 1 megohm

Total Resistance Tolerance ...............................10 % or 20 % .................................................... 5% or 10%

Independent Linearity .......................................±5 % .................................................................. ±5 %

Absolute Minimum Resistance .........................2 ohms maximum .............................................. 2 ohms maximum

Effective Electrical Angle ..................................(Linear tapers) 240 ° ± 5 °.................................. (Linear tapers) 240 ° ± 6 °

(Audio tapers) 225 ° ± 5 ° .................................. (Audio tapers) 225 ° ± 6 °

Contact Resistance Variation ...........................±1 % .................................................................. ±1 % or 3 ohms (whichever is greater)

Dielectric Withstanding Voltage (MIL-STD-202, Method 301)

Sea Level ....................................................1,500 VAC minimum .......................................... 1,500 VAC minimum

70,000 Feet .................................................500 VAC minimum ............................................. 500 VAC minimum

Insulation Resistance (500 VDC) ......................1,000 megohms minimum ................................. 1,000 megohms minimum

Power Rating (Voltage Limited By Power Dissipation or 350 VAC, Whichever Is Less)

+70 °C Single Section Assembly ................(Linear tapers) 0.5 watt ...................................... (Linear tapers) 2 watts

(Audio tapers) 0.25 watt .................................... (Audio tapers) 1 watt

+70 °C Multiple Section Assembly .............(Linear tapers) 0.5 watt/section ......................... (Linear tapers) 1 watt/section

(Audio tapers) 0.25 watt/section ....................... (Audio tapers) 0.5 watt/section

+125 °C .......................................................0 watt................................................................. 0 watt

Theoretical Resolution ......................................Essentially inﬁnite .............................................. Essentially inﬁnite

Environmental Characteristics

Operating Temperature Range .......................... -40 °C to +125 °C ................................................-40 °C to +125 °C

Storage Temperature Range.............................. -55 °C to +125 °C ................................................-55 °C to +125 °C

Temperature Coefﬁcient Over Storage

Temperature Range.......................................... ±1,000 ppm/°C.....................................................±150 ppm/°C

Vibration (Single Section) ................................... 15 G ......................................................................15 G

Total Resistance Shift ................................... ±2 % maximum....................................................±2 % maximum

Voltage Ratio Shift ........................................ ±5 % maximum....................................................±5 % maximum

Shock (Single Section) ....................................... 30 G ......................................................................30 G

Total Resistance Shift ................................... ±2 % maximum....................................................±2 % maximum

Voltage Ratio Shift ........................................ ±5 % maximum....................................................±5 % maximum

Load Life ............................................................ 1,000 hours ..........................................................1,000 hours

Total Resistance Shift ................................... ±10 % maximum..................................................±5 % maximum

Rotational Life (No Load) ................................... 100,000 cycles .....................................................100,000 cycles

Total Resistance Shift ................................... (Linear tapers) 10 ohms or ±15 % TRS max. ......(All tapers) ±5 % TRS max.

(whichever is greater)

(Audio tapers) ±20 % maximum

Contact Resistance Variation

@ 50,000 cycles ........................................... (Linear tapers) ±2 %.............................................±2 %

(Audio tapers) ±3 % .............................................±3 %

Moisture Resistance (MIL-STD-202, Method 103, Condition B)

Total Resistance Shift ................................... (Linear tapers) ±10 % TRS maximum .................(All tapers) ±5 % TRS maximum

(Audio tapers) ±20 % TRS maximum

Insulation Resistance (500 VDC) .................. 100 megohms minimum ......................................100 megohms minimum

IP Rating ............................................................ IP 40 .....................................................................IP 40

*RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011.

Speciﬁcations are subject to change without notice.

Customers should verify actual device performance in their speciﬁc applications.

Model 91, 92, 93, 94 & 95 - 5/8 ” Square Single-Turn Panel Control

Mechanical Characteristics

Stop Strength (1/4 ” D shaft) .............................................................................................................................................45.19 N-cm (4 lb.-in.)

(1/8 ” D shaft) .............................................................................................................................................33.89 N-cm (3 lb.-in.)

Mechanical Angle.................................................................................................................................................................................300 ° ±5 °

Torque

Starting ........................................................................................................................................... 0.3 max. above average running torque

Running Torque

Single or Dual Section (A & R Bushings) .................................................................................................. 0.21 to 1.06 N-cm (0.3 to 1.5 oz.-in.)

Single or Dual Section (C & U Bushings) .................................................................................................. 0.14 to 1.06 N-cm (0.2 to 1.5 oz.-in.)

Mounting .............................................................................................................................................1.7-2.0 N-m (15-18 lb.-in.) maximum

Variation ...................................................................................................................... 0.35 N-cm (0.5 oz.-in.) maximum in 45 ° shaft travel

Weight (Single Section, Metal Bushing)...............................................................................................................................12.7 grams nominal

(Each Additional Section) ....................................................................................................................................................4 grams nominal

Terminals .................................................................................................................................Printed circuit terminals, J-Hooks or solder lugs

Soldering Condition ...........................................Recommended hand soldering using Sn95/Ag5 no clean solder, 0.025 ” wire diameter.

Maximum temperature 399 °C (750 °F) for 3 seconds. No wash process to be used with no clean ﬂux.

Marking ..................................................................................Manufacturer’s trademark, date code, resistance, manufacturer’s part number

Ganging (Multiple Section Potentiometers).............................................................................................................................2 cups maximum

Hardware ...................One lockwasher and one mounting nut is shipped with each potentiometer, except where noted in the part number.

NOTE:

Performance speciﬁcations do not apply to units subjected to printed circuit board cleaning procedures.

room ambient: +25 °C nominal and 50 % relative humidity nominal, except as noted.

Speciﬁcations are subject to change without notice.

Customers should verify actual device performance in their speciﬁc applications.

Model 91, 92, 93, 94 & 95 - 5/8 ” Square Single-Turn Panel Control

Product Dimensions

Model 91 PC Pin Terminals, In-Line

22.86 ± 0.43

(.900 ± .017)

MOUNTING

SURFACE

12.70 ± .229

(.500 ± .009)

0.79 ± .025

(.031 ± .010)

DIA.

13.72 ± 0.38

(.540 ± .015)

1.37 ± 0.08

(.054 ± .003)

2.36 ± 0.08

(.093 ± .003)

15.88

(.625)

7.92

(.312)

Model 92 J-Hooked

Terminals, In-Line

.79

(.031) 2 PLCS.

3 2 1

.254

(.010)

GAP

SEE

HOW TO ORDER

CHART FOR

BUSHING OPTIONS.

10.16 ± 0.30

(.400 ± .012)

11.05 ± 0.20

(.435 ± .008)

SEE

FOR SHAFT

OPTIONS.

1.19

(.047)

“A” STYLE

A.R. LUG

9.53

(.375)

15.29 ± 0.56

(.602 ± .022)

5.08

(.20)

1.52

(.06)

2.54

(.100)

2.54

(.100)

Model 94 J-Hooked

Terminals, "L" Pattern

0.76 ± 0.05

(.030 ± .002)

TYP.

Model 93 PC Pin Terminals, "L" Pattern

22.86 ± 0.43

(.900 ± .017)

MOUNTING

SURFACE

12.70 ± .229

(.500 ± .009)

0.79 ± .025

(.031 ± .010)

DIA.

13.72 ± 0.38

(.540 ± .015)

1.37 ± 0.08

(.054 ± .003)

2.36 ± 0.08

(.093 ± .003)

15.88

(.625)

7.92

(.312)

3 2 1

1.52

(.06)

GAP

.81

(.032)

R. MAX.

5.33 ± .76

(.21 ± .03)

3.81

(.150)

MAX. TYP.

SEE

HOW TO ORDER

CHART FOR

BUSHING OPTIONS.

DIA.

0.81

TYP.

(.032)

10.16 ± 0.30

(.400 ± .012)

5.08 ± 0.38

(.200 ± .015)

11.05 ± 0.20

(.435 ± .008)

SEE

FOR SHAFT

OPTIONS.

1.19

(.047)

“A” STYLE

A.R. LUG

9.53

(.375)

12.7 ± 1.02

(.500 ± .040)

Shaft Flat Orientation

2.54

(.100)

2.54

(.100)

120 ° ± 5 ° STD.

FLAT ORIENTATION

(SHAFT AT CCW END)

0.76 ± 0.05

(.030 ± .002)

TYP.

CCW

POTENTIOMETER

Model 95 Solder Lug Terminals, "Triangular" Pattern

5.08 ± 1.02

(.200 ± .040)

4.45 ± .38

(.175 ± .015)

10.16

(.40)

5.59 ± .20

(.220 ± .008)

4.45 ± .38

(.175 ± .015)

2.54

(.100)

2.54

(.100)

2.03

(.080)

3 PLCS.

.41

(.016)

2.29

1.02

(.040) WIDE X (.090) LONG

3 PLCS.

.381

TOLERANCES EXCEPT AS SHOWN: DECIMAL .XXX ± (.015 )FRACTION ± 1/64

9.65

.XX ±

ANGLE ±5 °

(.38)

Speciﬁcations are subject to change without notice.

Customers should verify actual device performance in their speciﬁc applications.

Model 91, 92, 93, 94 & 95 - 5/8 ” Square Single-Turn Panel Control

Product Dimensions

Plastic

Shaft

Styles

SHAFT TYPE "B"

(USES BUSHING A)

1.60+.38/-.00

(.063+.015/-.000)

6.32+.000/-.152

(.249+.000/.006)

DIA.

SHAFT TYPE "D"

(USES BUSHING C)

13.16+.00/-.15

DIA.

(.1245+.000/-.006)

SHAFT TYPE "T"

(USES BUSHING U)

1.50 ± .25

(0.06 ± .001)

.79

(0.03)

STD. LENGTHS:

16.0

(.630)

22.0

(.866)

1.19

(.047)

STD. LENGTHS:

15.88

19.05

(.625) (.750)

12.70

(.500)

22.23

(.875)

STD. LENGTHS:

12.70

15.88

19.05

(.500) (.625) (.750)

3.988 +0.000/-0.051

(.157 +.000/-.002)

DIA.

SHAFT TYPE "C"

(USES BUSHING A)

11.18 ± .38

(.440 ± .015)

SHAFT TYPE "R"

(USES BUSHING R)

1.80 ± .25

(0.07 ± .001)

5.994 +0.000/-0.051

(.236 +.000/-.002)

DIA.

1.00

(.04)

STD. LENGTHS:

16.0

(.630)

22.0

(.866)

SHAFT TYPE "W"

(USES BUSHING A)

14.27 ± .25

(.562 ± .010)

5.49

(.216)

STD. LENGTHS:

19.05

22.23

(.750) (.875)

6.30+.000/-.152

(.248+.000/.006)

DIA.

48 TOOTH

6.31+.025/-.051

(.2485+.001/.002)

DIA.

STD. LENGTHS:

25.40

(1.00)

Metal

Shaft

Styles

SHAFT TYPE "A"

(USES BUSHING A)

6.32+.010/-.025

(.2490+.0004/.0010)

DIA

SHAFT TYPE "H"

(USES BUSHING A)

“F” ± .38

(“F” ± .015)

6.32+.010/-.025

(.2490+.0004/.0010)

DIA

5.486 ± .051

(.216 ± .002)

25.4

(1.000)

STD. LENGTHS:

19.05

(.750)

22.23

(.875)

SHAFT TYPE "S"

(USES BUSHING R)

“F” ± .381

(“F” ± .015)

6.000+.000/-.035

(.2362+.0000/.0014)

DIA

3.988 ± .076

(.157 ± .003)

STD. LENGTHS:

19.05

(.750)

22.23

(.875)

STD. LENGTHS:

12.70

(.500)

15.88

(.625)

19.05

(.750)

22.23

(.875)

FLAT LENGTH “F”:

9.98

(.393)

12.98

(.511)

SHAFT TYPE "E"

(USES BUSHING C)

0.79 ± 0.25

(.031 ± .010)

3.16

(.1245)

DIA

7.95

(.313)

11.13

(.438)

SHAFT TYPE "J"

(USES BUSHING R)

1.80 ± 0.25

(.071 ± .010)

6.00+.000/-.035

(.2362+.0000/.0010)

DIA

SHAFT TYPE "V"

(USES BUSHING U)

1.50 ± 0.25

(.059 ± .010)

3.99+.000/-.035

(.1571+.0000/.0010)

DIA

0.79

(.031)

STD. LENGTHS:

12.0

(.500)

16.0

(.625)

19.0

(.750)

1.00 ± 0.13

(.039 ± .054)

STD. LENGTHS:

0.79 ± 0.13

(.031 ± .054)

STD. LENGTHS:

19.05

(.750)

22.23

(.875)

SHAFT TYPE "G"

(USES BUSHING A)

1.60+.38/-.00

(.063+.015/-.000)

6.32+.010/-.025

(.2490+.0004/.0010)

DIA.

1.194

(.047)

STD. LENGTHS:

15.88

19.05

(.625) (.750)

16.0

(.630)

22.0

(.866)

TOLERANCES EXCEPT AS SHOWN: .XX = ±

.02

(.050)

.005

.XXX = ±

(.127)

.0005

.XXXX = ±

(.0127)

12.70

(.500)

22.23

(.875)

DIMENSIONS:

(INCHES)

Speciﬁcations are subject to change without notice.

Customers should verify actual device performance in their speciﬁc applications.

How to Order Model 91, 92, 93, 94 & 95 Panel Controls

A15

Part number for multiple section potentiometers must have

a taper and resistance value for each section.

ANTI-ROTATION LUG

Single .305 ” (7.8 mm) R,

90 °CW

No Lug

# SECTIONS

1 Single

2 Dual

SHAFT

LENGTH

(FMS)

Code Description

1/2 ”L

5/8 ”L

3/4 ”L

7/8 ”L

1 ”L

METRIC

AVAILABLE

ONLY IN

BUSHING

Code

A, C

R, U

ELEMENT TAPER

TYPE/TOLERANCE

(A)

Linear Cermet ±10 %

(H)

Linear Cermet ±5 %

RoHS IDENTIFIER

Compliant

Blank Non-Compliant

Non-compliant versions are

available, but not recommended

for new designs.

16 mmL

22 mmL

BUSHING

Metal Plain 3/8 ” (9.53 mm) D x 3/8 ” (9.53 mm) L

Metal Plain 1/4 ” (6.35 mm) D x 1/4 ” (6.35 mm) L

Metal Plain 10 mm D x 9 mm L

Metal Plain 7 mm D x 9 mm L

MODEL

Single-Turn, In-Line PC Pins

Single-Turn, In-Line J-Hooks

Single-Turn, L-Pattern PC Pins

Single-Turn, L-Pattern J-Hooks

Single-Turn, Triangle-Pattern Solder Lugs

(B)

(E)

AVAILABLE ONLY IN

LENGTHS

BUSHINGS

(CODE)

16, 20, 24, 28

24, 28

16, 20, 24

Metric 16, 22

16, 20, 24

16, 20, 24, 28

24, 28

Metric 16, 22

SHAFT TYPE

Plastic Single Slotted 1/4 " (6.35 mm) D

Plastic Single Flatted 1/4" (6.35 mm) D

Plastic Single Plain 1/8" (3.18 mm) D

Plastic Single Slotted 6 mm D

Plastic Single Slotted 4 mm D

Plastic Single Knurled 1/4" (6.35 mm) D

Metal Single Plain 1/4" (6.35 mm) D

Metal Single Slotted 1/8" (3.18 mm) D

Metal Single Slotted 1/4" (6.35 mm) D

Metal Single Flatted 1/4" (6.35 mm) D

Metal Single Slotted 6 mm D

Metal Single Flatted 6 mm D

Metal Single Slotted 4 mm D

(C)

(D)

(F)

(G)

(S)

(T)

RESISTANCE CODE

VALUE IN OHMS

(05) - 100

(30) - 15 K

(28) - 150

(16) - 20 K

(06) - 200

(17) - 25 K

(07) - 250

(18) - 50 K

(08) - 500

(20) - 100 K

(10) - 1 K

(21) - 200 K

(11) - 2 K

(22) - 250 K

(12) - 2.5 K (23) - 500 K

(13) - 5 K

(25) - 1 M

(15) - 10 K

Linear C-P ±20 %

(10) - 1 K

(18) - 50 K

Linear C-P ±10 %

(12) - 2.5 K

(20) - 100 K

(13) - 5 K

(22) - 250 K

(15) - 10 K

(23) - 500 K

(16) - 20 K (25) - 1 M

(17) - 25 K

CW Audio Cermet ±10 %

(10) - 1 K

(18) - 50 K

CW Audio C-P ±20 %

(12) - 2.5 K (20) - 100 K

CCW Audio Cermet ±10 % (13) - 5 K

(22) - 250 K

CCW Audio C-P ±20 %

(15) - 10 K (23) - 500 K

CW Audio C-P ±10 %

(17) - 25 K (25) - 1 M

CCW Audio C-P ± 10 %

Boldface features are Bourns standard options.

All others are available with higher minimum order

quantities.

REV. 11/11

Speciﬁcations are subject to change without notice.

Customers should verify actual device performance in their speciﬁc applications.

高分求 wince 冷启动，如果将多个文件放到指定目录？？: 如何在wince中添加多个（比如300个）文件到windows指定目录下面？？如果用。dat文件...; 赫敏蓝月 WindowsCE

简单说说汽车保险丝: 什么是汽车保险丝？保险丝，是我们习惯的称呼，而它官方名称叫熔断器。汽车保险丝的用途与家里保险丝...; led2015 汽车电子

流量传感器的问题: 如何测量石油的流量？选择哪种流量传感器比较好？求解流量传感器的问题这个早有专业设备，属于标准件，...; 叶子5 模拟电子

【ACM32G103RCT6开发板测评】+ I2C之EEPROM读写测试: 测试下使用ACM32G103RCT6开发板的硬件I2C来读写AT24C02。一、I2c ...; TL-LED 国产芯片交流

51单片机应用从零开始: 我的第一本51的入门教材，很不错啊，现在把电子版的发上来，和大家分享 51单片机应用从零开始看看...; 子诺如歌 51单片机

什么是协议分析仪和训练器: 协议分析仪和训练器是两种不同但相关的设备或工具，它们在网络通信、电子设计和测试等领域发挥着重...; 维立信测试仪器测试/测量

同步和异步的区别电平异步时序逻辑电路

脉冲异步时序电路和同步时序电路有两个共同的特点： ● 电路状态的转换是在脉冲作用下实现的。在同步时序电路中尽管输入信号可以是电平信号或者脉冲信号，但电路的状态转换受统一的时钟脉冲控制；脉冲异步时序电路中没有统一的时钟脉冲，因此，规定输入信号为脉冲信号，即控制电路状态转换的脉冲由电路状态输入端直接提供。 ● 电路对过去输入信号的记忆是由触发器实现的。在同步时序电路中采用...[详细]
孙正义决定让ARM 2023年在纽约上市

北京时间3月2日消息，软银集团旗下英国芯片设计巨头ARM已决定暂时不在伦敦证券交易所发行股票，这对英国政客是一个打击。此前，英国政客一直在游说ARM在本国交易所上市。知情人士称，ARM将专注于今年晚些时候让ARM只在纽约上市。该公司的总部暂时会留在英国剑桥，但是不排除未来在伦敦二次上市的可能性，但这种可能性不大。知情人士此前透露，软银去年为ARM设定的目标估值是至少达到600亿美元。软银...[详细]
OnStar最新监测系统出招，被盗的车辆会自动减速！

一些车贼可能会对以下内容感到吃惊！当他们驾驶盗窃的车辆被警察追逐时，被盗车辆会自动减速。 OnStar发布了一种新的被盗车辆服务，它容许安全顾问通过发出遥控信号让引擎的燃油流动减少，从而使被盗车辆减速。该公司表示，其顾问可能不久将与法律强制权力机构一道工作，并向被盗车辆发出信号，以便这些被盗车辆将逐渐减速。该服务将在一些通用汽车的2009车型上亮相。大约160万辆汽车，其中，大约2/3是雪...[详细]
海尚重磅推出新一代矢量摆线减速机（内含撞击实验等你来挑战！）

目前，应用于机器人、精密机床、航空航天等精密伺服机构的传动装置要求具有高传动精度，高传动刚度，传动比大，传动效率高，体积小、重量轻，传动回差小等特点，而国内减速机技术还缺乏整体的突破，导致我国高端装备制造领域机器人产业发展缓慢，只能依赖进口。为了打破国产工业机器人用精密减速器严重依赖进口的局面，推动我国机器人产业的健康发展，海尚集团匠心多年专注于减速机技术的研发突破，9月17日上海工博会（7．...[详细]
基于μC/OSⅡ的实时任务模型研究与应用

　　 0 引言　　由于实时程序运行机制与传统程序相比具有独特性，在实时应用程序开发和相关教学实践中，如何根据应用需求和系统功能设计，确立实时程序结构，完成代码的设计与实现则是一个首要的、关键的问题。软件设计者常因缺乏简易、实用的实时软件开发基本方法，难以快速建立全面、系统的开发思路和实施步骤。现有实时内核技术及其应用软件开发资料篇幅较大，技术细节多，学习周期长，可操作性较差，一定程度上影...[详细]
RFID无线仓储管理解决方案(LINX-WMS)

灵蛙仓库管理系统是上海灵蛙开发的基于条码和RFID自动识别技术的现代化仓库管理系统，能有效地对仓库流程和空间进行管理，实现批次管理、快速出入库和动态盘点。通过运用条形码自动识别技术，通过802.11B无线网络进行数据传输，记录并跟踪物料在企业内部物流中的各个环节,帮助企业的物流管理人员对库存物品的入库、出库、移动、盘点、配料等操作进行全面的控制和管理,有效的利用仓库存储空间，提...[详细]
背光驱动电路的选择策略和应用

越来越多的便携式消费电子产品配备了彩色显示屏，例如手机、数码相机、PDA、MP3、PMP播放器等，其中手机又占据了这个市场的绝大部分份额，从而导致了这两年来中小尺寸显示屏产业链的飞速发展。根据应用的不同，显示屏会有不同的种类，例如TFT-LCD、CSTN-LCD以及OLED显示屏，从市场的应用看，OLED显示屏只是在折叠式手机的副屏以及MP3的市场上占有一定的份额，而市场的主流依然是TFT和CST...[详细]
测量雷达功率包括哪些种选择

“雷达系统应用广泛，不同类型的雷达应用场景也不同，它需要综合考虑性能、尺寸、成本等一系列因素。比如警用雷达常使用连续波雷达来简单测量运动车辆的速度而不需关注距离信息。因此，低成本和小尺寸就比先进性能和特性更重要。” 雷达系统应用广泛，不同类型的雷达应用场景也不同，它需要综合考虑性能、尺寸、成本等一系列因素。比如警用雷达常使用连续波雷达来简单测量运动车辆的速度而不需关注距离信息。因此，低成本和...[详细]
6N5P甲类推挽20W功放

本人酷爱音响，四十余年中先后打造各种功放百余件。经过几十年的长期听音对比，最令本人满意的、性价比最高的还是6N5P甲类推挽无反馈胆机。该机技术性能优良，听感上乘，有必要在此介绍给烧友们共享。一、电路结构本功放电路原理见图1，图中是一个声道的线路，另一声道完全相同。由V1构成输入电压放大级，V2构成倒相推动级，V3、V4构成推挽输出级。由于前置输八电压放大级对整机的信噪比指标起决...[详细]
铺铜是什么？PCB中铺铜作用分析

如果PCB的地较多，有SGND、AGND、GND，等等，就要根据PCB板面位置的不同，分别以最主要的“地”作为基准参考来独立覆铜，即是将地连接在一起。一般铺铜有几个方面原因。１，EMC.对于大面积的地或电源铺铜，会起到屏蔽作用，有些特殊地，如 PGND 起到防护作用。２，PCB 工艺要求。一般为了保证电镀效果，或者层压不变形，对于布线较少的PCB 板层铺铜。３，信号完整性...[详细]
小米上半年手机销量3470万部同比增长33%

7月2日消息，小米董事长雷军今日在微博上公布了小米手机上半年的销量数据：3470万台，同比增长33%。在去年同期，小米手机的出货量为2600万台，雷军曾在年初披露，小米今年的目标是8000万台至1亿台之间。“3470万销售量是产品实际达到用户手里的Sell Out数据。在2015年智能手机市场增速放缓的情况下，小米能在去年6112万总销售量的基数上保持33%的同比增长，可以说跑赢了大市，...[详细]
光电二极管工作原理

光电二极管工作原理光电二极管是将光信号变成电信号的半导体器件。它的核心部分也是一个PN结，和普通二极管相比，在结构上不同的是，为了便于接受入射光照，PN结面积尽量做的大一些，电极面积尽量小些，而且PN结的结深很浅，一般小于1微米。光电二极管是在反向电压作用之下工作的。没有光照时，反向电流很小（一般小于0.1微安），称为暗电流。当有光照时，携带能量的光子进入PN结后，把能量传给共价键上...[详细]
人工智能公司体素科技即将给医疗影像领域带来根本性的变化

人工智能在最近几年获得了极大的发展，不论从视觉识别，语音识别，还是无人驾驶。领域内人士普遍认为，在五到十年之内，这些技术就可以真正变成普遍的产品渗入人们的生活，带来像当年互联网刚普及时的影响。但是如果我们不只把目光局限于大街上的话，我们在在接下来的一两年内就将在医疗影像领域切实体会到这变革性的影响。这变革将由像体素科技这样的公司带来。该公司由UCLA助理研究员(研究助理教授教授丁晓伟)两年...[详细]
Ovum论数据中心为“战略服务中心”

墨尔本，7月16日，2012 -根据Ovum的报告，全球运营商正在增加对数据中心的投资，从而提供先进的云服务给跨国公司和大型企业的客户及满足他们的需求。在数据中心和相关的基础设施的投资，目前正在整合成一个全面的战略，其中包括增加的服务层和先进的服务超越了传统的网络服务并扩大至全球性。在这份最新报告*，Ovum提出，数据中心正在成为新的企业信息和通信技术服务的战略服务中心。每个运营商都会根据各...[详细]
传OpenAI即将推出新款智能体能为用户自动执行任务

据两名知情人士透露，美国人工智能初创企业OpenAI正准备推出一款代号为“Operator”的新型智能体。该智能体可以通过计算机代替用户完成编写代码或预订旅程等任务。其中一位匿名知情人士透露，在周三的员工会议上，OpenAI管理层宣布计划于明年1月发布该工具的研究预览版，并通过API（应用程序接口）向开发者开放。 OpenAI尚未对置评请求作出回应。此次发布计划正值整个行业加速发展智...[详细]