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pt1000 compared pt100
Yes, it's safe but you will get wrong result. I'm afraid that the selfheating will rise the sensor temperature. If You wish You may check it by using different currents or periods. For example : 1mA for 100ms, 250 ms, 500ms and 1 sec.
rtd 50 measure microchip
I suppose You have a low-pass filter in sensor signal path. If this filter has time constant 50ms You should apply the reference current ( 1 mA or less ) app. 500ms before measuring and stop it immediately after the conversion complete. This mode of opperation alows use...
constant current pt1000
5mA*5mA*1000Ohm = 25mW, it WILL destroy the sensor for less then a minute. Use <1mA with controlled current generator and apply the current only when you are meassuring.
The best way to do it is by using DDS chip, like AD9851, to get an 1MHz signal. Then you have to use PLL and a microcontroller, f.e PIC. If You have questions about hardware and software for MCU feel free to ask.
Note by English is not the best.:D
I am usin SD Cards with SD bus mode (only 1 data wire, not 4 ).
1. Leading bit is not taken in care when calculating CRC. You make check it yourself by simply reading one 512B block and compare the CRC returned by the card.
2. Errasing is not nessessary. You may put 'write ' command any time CD...
sawtooth generation op amp
Take care of some possible problems.
1. I don't know what type of OA are You using, but ussualy OA have no rail-to-rail output and 'low' and 'high' output voltages of the square wave oscilator would be unsymmetrical according to power supply. For example : Low 0.4V...
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