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    Reader for Zeiss ABBE 01-200C

    https://www.ebay.com/itm/125970297371
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    Reader for Zeiss ABBE 01-200C

    zeiss IDL is very old, if you cannot find AE101, you can try ND281 directly, i think the principles are the same at that time, one led as light source, 5 photocells as 0/90/180/270 quadrature receiver and reference mark, you only have to make a adaptor to convert IDL output to heidenhain 11ua or...
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    Precision turntable

    i would like to pay 200 euro for the probe and the signal condition box, if you buy it:)
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    Mitutoyo gage amplifier probe plug type for MU Checker?

    I have 519-521 and 519-322, they all use DIN-5 connector, the onlu difference is the screw is not metal but plastic
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    Has anyone built an LVDT amplifier/signal conditioner?

    https://www.ti.com/lit/an/slyt704/slyt704.pdf SNR calculation for PGA970
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    Has anyone built an LVDT amplifier/signal conditioner?

    if you want to achieve 0.1arcsec sensitivity, you dont need DLIA, normal ALIA can do so. in my experiment, if i stop the pendulum of talyvel, i can get 0.01um noise from the displacement sensor, thats nearly 0.2um/m, better than 0.1arcsec. but the free pendulum will resonate in an actual...
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    Has anyone built an LVDT amplifier/signal conditioner?

    The PGA970 is a simplefied DSP-based Lock-in-Amplifier, it has 2 priors. 1, less analog componants, lower drift, lower temp-coefficient. 2, can achieve 0 and 90 degree pure-sine-response demod, which eliminate even-order harmonic response. Low-THD signal source can only reduce the even-order...
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    WHat is the difference between various Hilger & Watts Auto-collimators

    https://www.chipmaker.ru/files/file/18965/
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    DIY electronic level builds

    Thats pretty complex. the servoed close loop clinometer could have wider range and bandwidth than the open loop ones, thats a pretty good electronic level that you have
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    DIY electronic level builds

    https://www.imeko.org/publications/tc3-2014/IMEKO-TC3-2014-010.pdf thats a great idea. differential light sensors are sensitive, you can even use mirror or prism to extend the pendulum even longer. it is likely easy to achieve nano-rad sensitivity, but i think the repeat and long-term-drift are...
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    DIY electronic level builds

    Maybe the common mode noise are cancelled, like noise from powersource and natural resonance, while the other noises are averaged
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    DIY electronic level builds

    thanks for the info, the commercial MEMS parts are too small, so the resolution and noise performance are not good enough. you can try paralleling several parts together, the noise performance will degrade very close to 1/squareroot N,if 16 parts parallel, the noise could be 0.0001degree, that...
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    DIY electronic level builds

    thats already very good! could you pls tell me the model number, i want to find more about it
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    DIY electronic level builds

    thankyou for these pics, there are some intresting ideas!!! whats the resolution? how is the repeat? I tried myself following federal and talyvel, they are easy to achieve resolution better than 1um/m, but also easy to fail at repeat. the effective length of the pendulum is about 50mm, to...
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    Optimal LVDT shaft material?

    the core material doent effect accuracy, it only effect sensitivity, the eddy current lose could produce heat which would result bad tc, you can try the LIGO open ducument about building a tiltmeter LIGO‐G1000989, they do have very good ideas
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    Has anyone built an LVDT amplifier/signal conditioner?

    if you want to log the data to computer, the best choice is solartron orbit, try DP*05/1/2/5, which are digital sensors, and you need a RS232IM or USBIM to connect to computer, the PSU is not necessary , you can get 5v from any phone charger. they can achieve 18 bit resolution,and 16-bit noise...
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    Has anyone built an LVDT amplifier/signal conditioner?

    Try a Mitutoyo 519-401/402/411/403/413 manufactured after 1990, they are designed for half-bridge sensors, the critical parts are build on ceramic-substrate, it has a good temp-drift performance, if you want more, replace the 3 1/4W dip resistors around the sine generator with foil resistor(low...
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    Hilger & Watts Autocollimator and Clinometer

    i made a test circuit, the OP-driver is not strong enough to drive the coil, so the amplitude of vibration is not enough, but you can already see the difference between aiming targets.the excitation signal is 75Hz the photocell circuit is not amplfied, just Gain=1 buffer the blue channel is...
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    Precision Electronic Levels - Taylvel

    i havn't tried them myself, but according to the datasheet of AD598/698, the noise performance is only 13-14 bit, i think thats caused by crosstalk or channel seperation, the PGA970 use digital-demod, not widely used. the commercial LVDT circuit could achieve 17bit noise-free-enob while BOM cost...
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    Precision Electronic Levels - Taylvel

    that's awesome. the servo based clinometer has a very good zero-drift, most of the seismograph use this structure i checked the datasheet ,but the Schaevitz claims that the repeativity is 0.04%, that is 1.44 arcsec or 7.2um/m, almost 7 times the talyvel sensor. how is your sensor?
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