Recent content by bjbdts

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

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...

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

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

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...

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...

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...

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

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...

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

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

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...

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

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

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