Author Topic: Fluke 713 Pressure Calibrator Teardown  (Read 2485 times)

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Offline ChipguyTopic starter

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Fluke 713 Pressure Calibrator Teardown
« on: June 05, 2014, 10:02:19 pm »
Hi,
welcome to teardown Thursday  ;)
Unfortunately I still don't call a decent HD camera my own but I want to share my teardown of a Fluke 713 pressure calibrator.

Here you can find the datasheet of the pressure sensor, at least a compatible one.
http://www.ge-mcs.com/download/pressure-mems/920-303B_LR.pdf

The circuit in the Fluke is basically the one in the datasheet plus a differential amplifier so the entre circuit becomes a instrumentation amlifier like this:
http://upload.wikimedia.org/wikipedia/commons/thumb/e/ed/Op-Amp_Instrumentation_Amplifier.svg/400px-Op-Amp_Instrumentation_Amplifier.svg.png.

It is a pretty straight forward design from 1997. I bet today's Fluke 713 will look different inside since the 20 bis ADC is not available anymore.

Here I have marked some parts of the circuit. Here the Current loop amplifier, pressure sensor and multiplexer.


Here the Instrumentation amplifier and the excitation circuit.


Below is the picture gallery I have shot. Enjoy.

Again, sorry for not having done a video on this. I should get a camera for that, I know.



Where is that smoke coming from?
 

Offline EEVblog

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Re: Fluke 713 Pressure Calibrator Teardown
« Reply #1 on: June 06, 2014, 12:14:50 am »
Awesome work & photos  :-+
 

Offline TimNJ

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Re: Fluke 713 Pressure Calibrator Teardown
« Reply #2 on: June 06, 2014, 04:00:45 am »
Yes, I agree with Dave. Awesome pictures!
 

Offline ChipguyTopic starter

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Re: Fluke 713 Pressure Calibrator Teardown
« Reply #3 on: June 06, 2014, 05:47:30 am »
Thanks  :)
Where is that smoke coming from?
 


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