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  1. bjbdts

    1 1/2-20 thread male connection

    Here is the other file bjbdtshttp://files.engineering.com/getfile.aspx?folder=46f9ca0e-d2f8-46a1-8bc8-7e3a3ddc3c16&file=laser_sight_assembly.JPG
  2. bjbdts

    1 1/2-20 thread male connection

    I see a lot of confusions about the thread size. Please check the attached files for the thread information. One file is to show how the laser sight assembly and the IR sensor head (from the thermometer) is connected. The other file is a drawing of the IR sensor head. These two files are from...
  3. bjbdts

    1 1/2-20 thread male connection

    I'm sure the thread is 1 1/2-20. It's orignally connected to a thermometer from omega engineernig. The thermometer has a male 1 1/2-20 connection. I want to use the laser sight accessory in another application. bjbdts
  4. bjbdts

    1 1/2-20 thread male connection

    Hi everyone: I have a laser sight accessory with a female 1 1/2-20 thread connection. I'm searching for a male 1/1/2-20 thread of anything (rod,pipe,adapter) such that I can mount this laser sight to a fixture. Any help will be appreciated. Thanks, bjbdts
  5. bjbdts

    Can electrically conductive silicone rubber block microwaves?

    Thanks for the responses.I tried to use a regular silicone o-ring(not electrically conductive)in the similar posion as in the drawing previously attached. The microwave leakage detected is a few mW. The power input is serveral hundred Watts. This is why in the new design I'm thinking using...
  6. bjbdts

    Can electrically conductive silicone rubber block microwaves?

    VE1BLL: Sorry I didn't state the problem clearly. The main part of the chamber is made of metal, the electrically conductive rubber I asked is supposed to fill the gap between two metal pieces. The gap between the two metal pieces is less than 50mil. Please refer to the simplified drawing...
  7. bjbdts

    Can electrically conductive silicone rubber block microwaves?

    Hi everyone: I'm working on a microwave chamber design(2.45GHz). The chamber needs to be pumped down to a certain vacuum level, at the mean time needs to be microwave safe. I'm wondering if anybody here has experiences about using electrically conductive silicone rubber in order to meet the...
  8. bjbdts

    spikes caused by the cooling fans

    Hi, Thanks for your responses. I first tried to put a capacitor over 12V power supply. The spikes got smaller and appeared less frequently. Then I tried to use a separate 12V power supply. And it worked! The spikes were gone. Really appreciated your helps. bjbdts
  9. bjbdts

    spikes caused by the cooling fans

    Hi, everyone: I'm using a temperature sensor to monitor the temperature of our sample. The temperature reading is shown in my computer. the sensor is powered up by a 12V regular power adapter. It's working OK until I connect a couple of 12V DC cooling fans to the circuit. They are powered up by...
  10. bjbdts

    Max. amps and hp rating for electrical switch

    Thanks itsmoked for the detailed explanation. My power supply needs about 10-15A for operating. It has a 25A peak inrush current limiting (Now this spec makes sense to me). So I think it will be sufficient to buy a 30A switch. bj
  11. bjbdts

    Max. amps and hp rating for electrical switch

    Thanks, davidbeach. Actually I'm not using moters, I only want to turn on/off a 2500W DC power supply( it doesn't have a switch itself). In that sense maybe I don't need to worry about the hp issue? bj
  12. bjbdts

    Max. amps and hp rating for electrical switch

    Hi, everyone: I need a switch to turn on/off a 2500W power supply(single phase) from wall outlet (220Vac). When I look at the specs of related product I get a little confusion: Why the manufactures give Max. amps at 240VAC/600VAC, but at the same time MAX. horse power. By just looking at the...
  13. bjbdts

    recommendation of S parameter measurement service

    Thanks, Logbook. Location: CA, USA Measurement: on wafer Frequency: 8-12GHz Accuracy: standard If you know of any company, would you be kind enough to provide me the information? I will contact company for details. Checked NIST, will check NPL. bj
  14. bjbdts

    recommendation of S parameter measurement service

    Hi, everyone: I have a few samples that need to do S parameter measurements up to 10GHz, and wondering if you can give me any recommendation on companies who provide this service? Thanks in advance. bj
  15. bjbdts

    X ray service, fine focus

    Yeah! that's the one. It's "feinfocus" ! Thank you, logbook. bj
  16. bjbdts

    X ray service, fine focus

    Hi, everyone: I'm trying to find a X ray service that can produce high resolution photos to show the soldering bump and pad bonding quality. I heard of a company called "fine focus", but strangely I cannot find it from internet. Does anybody here know it? I'd appreciate very much if you can tell...
  17. bjbdts

    Energy in microwave cavity

    Hi, everyone: I'm desining two circular cavity resonators. The size of the two cavities are different from each other, but the unloaded Q is same, i.e. a1/d1=a2/d2. The dominant mode is TM010. I'm trying to figure out the relationship of amplitude of the Electric field between each cavity. The...
  18. bjbdts

    S parameter measurement service?

    Hi, biff44: Thanks for your response. I will contact them. The only drawback is they are in MA, while we are in CA. bj
  19. bjbdts

    S parameter measurement service?

    Hi, everyone: I'am looking for reliable companies that provide S parameter measurement service. We have some chips (packaged and unpackaged)that we would like to compare and check the influence of our packaging technique. Any recommendation is appreciated. thanks in advance. bj
  20. bjbdts

    Root cause of RF power amplifier failure?

    Hi, BrianG: Thanks for your response. I still have confusion why didn't the 3rd port( should be matched load)of the isolator get burned. And since the temperature of the isolator is above 50 degree C, is it possible that the ferrite material of the isolator got demagnetized so that the reflected...

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