M*****S 发帖数: 512 | 1 up
Brand new) - $15
multimeter - $30
- $150 |
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M*****S 发帖数: 512 | 2 up
Brand new) - $15
multimeter - $30 |
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M*****S 发帖数: 512 | 3 up
Answering System (KX-TG1032S) - $35
Brand new) - $15
multimeter - $30 |
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M*****S 发帖数: 512 | 4 Panasonic DECT 6.0-Series Dual-Handset Cordless Phone System with Answering System (KX-TG1032S) - $35
Hawk SH-150.1 Scout Aqua Water Scooter - $50
Neiko Mechanic's 6-piece Cushion Soft Grip Pliers Set, Retail with Pouch (Brand new) - $15
Bushnell Powerview 10x32 Compact Folding Binocular - $25
Allied 69062 196 Piece Tool Set in Metal Tool Box with Craftsman digital multimeter - $30
Folding table - $5
Antec Solo Black/Silver Steel ATX Mid Tower Computer Case - $50
Sterilite 3 Drawer Wide Cart - $... 阅读全帖 |
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n*****s 发帖数: 8 | 5 诚聘:消费电子产品 测试工程师。SF Bay Area.
我们是一家快速发展的电子商务公司。地点在湾区(东湾)。现诚聘下面职位:
名称: 电子产品测试工程师
兼职 (将来有可能成为全职工作)
薪酬:有竞争力的小时薪酬。根据申请者的经历而定。
要求:
* 工程类大学学位(或能合法兼职工作的在校学生).
* 熟悉电子产品(如:网络摄像头,平板电脑,等)的维修或操作。有使用电烙铁以及万用表经历者优先考虑。
* 强烈的学习最新电子产品知识的愿望以及能力
* 良好的沟通技巧
* 具备合作精神
* 注重细节,有计划,工作负责
* 懂中文(普通话或者广东话)者优先
如有兴趣,请发简历以及简单自述到 j************[email protected]. 谢谢大家。
====================================
We are a fast growing E-commerce company in SF bay area (east bay) with the following position open.
Title: Electronics products testin... 阅读全帖 |
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e****c 发帖数: 840 | 6 里面的电容带高压,需要放电。所以插头拔掉等半小时再打开
微波炉的电路应该都是差不多的,没有什么复杂的
电容一般是几uF,普通的multimeter就能测量电容。二级管也比较容易测
磁控管不知道怎么检测,没接触过 |
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b***e 发帖数: 4591 | 7 ☆─────────────────────────────────────☆
echocc (echo) 于 (Sat Nov 27 23:25:02 2010, 美东) 提到:
才用了3年,今天突然坏了,转完了东西一点儿也不热。网上一查,买个新的要200多块
。找人来修肯定不划算。琢磨着能不能DIY。
前几天车库门忽然关不了了,我心想完了,找人来修起码一两百。我拿出说明书一查,
说是门关不了可能是sensor没对好。我四处检查了一下,发现是sensor边上的电线脱开
了,把两个电线接上,车库门又work了。回头我搞个电烙铁把电线都焊焊好
☆─────────────────────────────────────☆
QuK (等待·远航) 于 (Sat Nov 27 23:27:06 2010, 美东) 提到:
赞理工女生,开辟第二职业
☆─────────────────────────────────────☆
MindCruncher (头脑发热,再度) 于 (Sat Nov 27 23:47:16 2010, 美东) 提到:
任何电器不工作,... 阅读全帖 |
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P****n 发帖数: 202 | 8 Open the green caps, you will see the solenoids that controls water flow.
Open it manually to see if you can have water flow at corresponding heads.
If not, most likely a water pipe problem. Go find a plummer.
For electrical problem (most likely cause), find your control panel for your
irrigation system (mostly on garage wall). Read your manual or trouble
shooting guide (google it) for your irrigation system. You will find
instructions on how to test the system with a cheap multimeter. Control
p... 阅读全帖 |
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s*****i 发帖数: 5548 | 9 ☆─────────────────────────────────────☆
duoduo3 (duoduo) 于 (Wed Aug 3 11:55:30 2011, 美东) 提到:
换个sprinkler 喷头啥的都会,但是后院的喷水系统自从搬家过来从来没work过,今年
的德州天气要死人,后院的植物都奄奄一息,打算自救修一下,原来铺设的都还在,后
院三个zone,是不是先找Valve,但好像Valve都埋在地里,不知道怎么找valve。 有经
验的吭一声。谢谢。
☆─────────────────────────────────────☆
nkfly (南开阿飞) 于 (Wed Aug 3 11:56:30 2011, 美东) 提到:
一声都不敢吭。。。
☆─────────────────────────────────────☆
duoduo3 (duoduo) 于 (Wed Aug 3 11:58:25 2011, 美东) 提到:
你还是吭了
☆─────────────────────────────────────☆
Hak... 阅读全帖 |
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d********e 发帖数: 198 | 10 你是不是engineer? 是的话,花上1个小时把那个电路图弄明白,是很容易的;当初我
也是很糊涂,把电路图看明白后,就明白了:白线和白线连在一块,黑线和黑线连在一
块,记得还有那个地线,然后把blower和control在室内装好,试一下再说,同时买个
multimeter,检测一下range表面漏不漏电
你如果把图纸看明白了的话,就会知道那个speed control没有档,其实就是个电阻旋
钮,通过调节电阻来调节转速。 |
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x***k 发帖数: 3311 | 11 Dude, before you do anything, take a multimeter and measure the V to the
valve first. If no V, then you have a connection problem. If there is 12 or
24V then you have a valve (solenoid) issue.
automatic |
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x***k 发帖数: 3311 | 12 Dude, before you do anything, take a multimeter and measure the V to the
valve first. If no V, then you have a connection problem. If there is 12 or
24V then you have a valve (solenoid) issue.
automatic |
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w********6 发帖数: 12977 | 14 发信站: BBS 未名空间站 (看来需要买一个battery tester 手头没有现成的电阻,电线,一个简单的multimeter
只能测量开路电压,估计没法测出来电池是否该换了。 |
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g**o 发帖数: 3033 | 15
~~~~~~~~~~~~~~~~~~~~~~~~
this is correct, but make sure you are using stereo, not mono plugs.
stereo plugs are more common, many headphones come with one.
For impedence checking, just use some cheap earphones, which are 8ohms,
typically. If you can't get normal volume out of those earphones, it may
because your current headphone has higher impedence. Check with a multimeter
if you have. In this case, you need to invest a headphone amp.
But I really doubt a roland keyboard can't work well with a... 阅读全帖 |
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n*****s 发帖数: 10232 | 16 我院子小,没地方做shed。irri sys已经有了,重做是不太可能了,只好见招拆招,有
问题了就修,尽量多从问题里学点。。。fence现成的还好。landscaping除了palm
tree trim做不了,修草坪自己勤干着点就还好,其它植物和十来棵柏树还在纠结,自
己做的话可能那种大剪刀不够,还得上个电动剪枝的工具
另外室内室外还是需要购入一些趁手工具的,比如一套好用的screw driver,一个
multimeter。很英明的前段时间搞了套rigid的电钻,帮了我不少忙 |
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P****D 发帖数: 11146 | 18 【转】亮点在后面~~
happy猫猫_01
100 Skills Every Man Should Know: 2008's Ultimate DIY List
美国《机械杂志》推荐的“男人应该掌握的100项技能”
Automotive汽车出行
1. Handle a blowout 处理爆胎
2. Drive in snow在雪中驾驶
3. Check trouble codes检查故障
4. Replace fan belt更换风扇皮带
5. Wax a car给汽车打蜡
6. Conquer an off-road obstacle克服路面的障碍
7. Use a stick welder会焊接
8. Hitch up a trailer会拉拖车
9. Jump start a car会发动汽车
Handling Emergencies紧急事项
10. Perform the Heimlich会海姆利克氏操作
11. Reverse hypothermia懂得如何退烧
12. Perform hands-only CPR会做徒手的心肺复苏术
13. Escape a sinkin... 阅读全帖 |
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r*****g 发帖数: 7139 | 19 【 以下文字转载自 Living 讨论区 】
发信人: desesperado (desesperada), 信区: Living
标 题: “男人应该掌握的100项技能” 美版中国版
发信站: BBS 未名空间站 (Wed Jun 26 12:26:42 2013, 美东)
http://www.douban.com/group/topic/16532110/
100 Skills Every Man Should Know: 2008's Ultimate DIY List
美国《机械杂志》推荐的“男人应该掌握的100项技能”
Automotive汽车出行
1. Handle a blowout 处理爆胎
2. Drive in snow在雪中驾驶
3. Check trouble codes检查故障
4. Replace fan belt更换风扇皮带
5. Wax a car给汽车打蜡
6. Conquer an off-road obstacle克服路面的障碍
7. Use a stick welder会焊接
8. Hitch up a trailer会拉拖车
9. Jum... 阅读全帖 |
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u****q 发帖数: 24345 | 20 9V multimeter电死人简直不可思议啊。。。
确定是真的吗?
搞不好那个sailor本来心脏就有问题。 |
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c********h 发帖数: 7827 | 21 查一下Simpson 260 multimeter manual. 如果人体内阻真是100欧,怎么都死不了:放
Rx1档,输出只有1.5v,电流15mA,死不了;放Rx10000,输出9V,可是最高电流75uA,
也死不了。 |
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l*******G 发帖数: 1191 | 22 就是坐板凳,打酱油的撒
How to Become a Bench Technician
Jump to Schools for Bench Technicians
1Share
Most businesses and organizations depend on complex electronic equipment for
many different functions. Bench technicians are trained workers that fix a
variety of electronic components.
What does a bench technician do?
Bench technicians perform maintenance and repairs of a variety of electronic
equipment. They thoroughly diagnose problems by checking for common causes
such as defective parts or loose connec... 阅读全帖 |
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f**d 发帖数: 49 | 24 出差容易带的,可以用电池工作的,最好有multimeter功能。FLUKE太贵了.
有谁有这方面的经验的? |
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L*****e 发帖数: 169 | 25 it is said never use a multimeter to measure a laser diode.
have you burnt the laser diode?
about |
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i********g 发帖数: 90 | 26 Hehe, I burnt a LD just by connecting a multimeter to it. |
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l********8 发帖数: 491 | 27 对,量了几个电源,好像用multimeter量的电阻大概1~5k之间,那样在SPICE应该这么
模拟了? |
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d*******d 发帖数: 3382 | 28 CW = carrier wave, SW tone是指signal generator产生的sine wave tone
我的意思是DC是不是通常比较难用spectrum analyzer测。能不能用multimeter读DC?或
者用sine wave来看freq response,低频response应该能间接反映DC reponse? |
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b*****e 发帖数: 1193 | 29 To my ken, the knowledge tree of embedded system includes:
embedded C/C++
compiler and parser
ASM and assembler
RTOS
VS.net/Python/Perl/Makefile
UML
Matlab
Digital Signal Processing
Digital decoding and encoding
Software testing
Firmware
Network
Knowledge on devices
Hardware Design Knowledge(Analog and Digital ckt)
Basic FPGA and VHDL/VerilogHDL
System level test and troubleshooting
Configuration management
Knowledge on oscope, multimeter, and test instruments like labview.
Domain Knowledge(Auto... 阅读全帖 |
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h*******a 发帖数: 9 | 31 photodetector肯定是电压输出吗?输出阻抗是多少?
scope的probe里面也有阻抗的。几十个mv的level不能把测试设备当ideal来看 |
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c******k 发帖数: 1140 | 33 查过manual,photodetector肯定是电压输出,100ohm 的输出阻抗。但是打过技术支持
电话,这个detector的输出可直接接示波器(1Mohm)没问题。 |
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i*****t 发帖数: 24265 | 34 结果如何不同?是数值不同?还是压根数量级就截然不同? |
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l***g 发帖数: 1035 | 36 don't trust oscilloscope for small dc signal. use a true rms meter on the mV
scale. |
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E*****a 发帖数: 757 | 37 示波器经常连几V都测不准。和probes都很有关系 |
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t*****l 发帖数: 2658 | 39 use an active probe, make sure that GND lead is as short as possible, but st
ill, it is hard to use a scope to measure mv level signals. |
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r**********0 发帖数: 15 | 40 Keithley 2700 100uV档10M输入阻抗,并联负载。示波器探头1M,+/-3%误差,不可信
。建议用10uV以下档测,这时输入阻抗〉10G,应该接近真实值。楼主可以把3组不同情
况测一下,结果晒出来,大家看看理论值和实测差多少。 |
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i*****t 发帖数: 24265 | 41 测量不一致是仪表精度和内阻造成,不过要那么精确干什么呢?我一般关心的是放大后
的信号精度和线性度。 |
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p***e 发帖数: 472 | 43 The voltage measure sensitivity of most digital oscilloscopes is in the
order of mV/div. Some keithley digital multimeter allows a PC to read /
store the measurement with certain sampling rate. Then you can plot it to
see the waveform. You may be able to rent such equipment if you only need
it temporarily. Just google it.
,还要考虑直流offset,放大器输入阻抗,等等。如果没经验,这活你干不了。我猜你
可能想看波形,高精度万用表只能测直流,看不了波形的。 |
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a********m 发帖数: 92 | 44 小弟八月份毕业,开始找工快两个月了。感觉indeed和linkedin上虽然opening不少,
但是对fresh而言还是很艰难。我相信只要能找到第一份工作,以后的路应该会越走越
宽。希望版上各位过来人能给点建议,或者分享一点求职信息,在下感激不尽。
背景:
主要做过一些强电方面的design 和 testing
ECE Master Power Electronics
Experienced in the fields of:
- DCDC DCAC converter/inverter
- Linear & switch mode voltage regulator
- Magnetic components design
- Power MOSFET gate drive design
- Power electronics circuit modeling and analysis
- Electric vehicle traction drive system
- Wide bandgap semiconductor device (GaN & SiC) evaluation... 阅读全帖 |
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r***o 发帖数: 1526 | 45 用multimeter简直是开玩笑,这个得用MCU来做,一个MCU上有两三个ADC,再加上几个
16 channel multiplexer就差不多了,在ebay上买Arduino之类的开发板也就几十刀,
multiplexer要自己用面包板搭出来或者做线路板焊,数据可以存到开发板的SD卡上或
者传给电脑。 |
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D********i 发帖数: 103 | 46 如果是这个理由,那你那个同事说的测电压和这里大家建议的测电压是两码事..你同事
大概是说不能测photodiode的电压,这是对的,因为photodiode的电压不直接反应光强
。photodiode输出电流和光强成简单正比(在线性区间)。
这里大家建议的是,把固定电阻和photodiode串联,photodiode输出电流通过固定电阻
,测固定电阻两端电压。
事实上你说的multimeter直接测电流,它内部也是这么测的.. |
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