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Thank you everyone for the good replys. As someone surmised in one reply, I have moved on from this problem. Solution was to ignore the DC bias requirement and take a reading of the inductance with a normal LCR bridge, so noting the deviation from the spec requirement in my tech report. At the...

Try Edmund Scientific at http://www.edsci.com/ They have a whole section on microscope target optics, including parallel line measurement systems. Prices are reasonable. Kevin VanZuilen "KevinVZ"

Hello Alexandro! I too have been tech supervisor on a repair line, and I was blessed with a master technician who taught me the following line speed tricks: 1) Keep track of symptoms and what fixed them. Jbartos (a great help, by the way) suggested a "knowledge base". I used a paper...

I once designed a dip-time sensor which ran around on a "solder dial" which dipped electronic parts in a solder wave to tin the part leads. I used a gel-cell to power the sensor, and an infra-red LED to transmit the sensor data to a phototransistor, the combination housed in a small...

I used to work for a loudspeaker manufacturer some years ago. The resonance we used to refer to was the mechanical resonance of the speaker cone/coil combination, where the cone provided the energy storing "spring" and the coil/cone combo was the "mass" suspended and...

Since you have the waveform in squarewave form, it should be easy to convert to logic level. Then send this to a settable digital delay to adjust the phase. Ten years ago I programmed a Xilinx Field Programmable Gate Array (FPGA) to variably delay the phase of a 2400 Hz tone 0-180 degrees with...

Digikey stocks an 8-pin minidip IC from QT Optoelectronics called an "AC Line Monitor" which might do your job. TTL Output. Digikey p/n M1D400QT-ND cost $3.13 unit qty at this posting. I do not know if it will work down to 24VAC or not. There are also many large solid state relays and...

I have a spec requirement to check the inductance of some potted inductors used in a custom switching power supply. Their value is between 20 and 200 micro-Henrys but the spec calls out DC bias currents up to 6 amps while measuring! Spec calls out f=10KHz 0.1Vrms measurement. Need 0.1uH...