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{Temperature sensors} For the upcoming in-house-tests three LM35 sensors are mounted on a small board with a capacitor to buffer the input voltage. A flat ribbon cable connects the boards with the power supply and the read-out card. The sensor boards are coded to match with certain lines of the flat ribbon cable. The output voltage and therefore the temperature is measured with LabView as described before. (22.11.2002)

{LabView} Start with the Measurement and Automation tool to explore the DAQ environment installed... The Configuration of the DAQ channels available is done with this tool. Starting LabView gives a wizard which leads to the creation of a very simple VI (Virtual Instrument). For testing purpose channel 3 continuous voltage measurement --> reading the voltage of the LM35. Use for the analog input channel: Referenziert, einseitg geerdet.
First measurements are done 01.10.2002. Channel 3 in connector block pin 9 was used. Despite the data sheet the LM35 sensor starts working with a Voltage of approx +5.8V. Sometimes the voltage has to be chosen even higher to get the sensor work. Click here to view a LabView screen-shot. The web publishing tool was tested too;-) If something is running see here (only in the physi domain...!)


{Temperature measurement setup ver 0.2} direct read out of the  LM35 via National Instruments Card NI6062E Pic of NI6062E (available! Goofy setup)
-----> ISM 111 and ISK 100 obsolete in this solution! ---> LabView
25.09.2002 15 LM35CZ  are ordered, package TO-92 (Data-sheet PS file)


{Temperature measurement setup ver 0.1 (obsolete)} LM35 4 - 8 Sensors  (active element, 3 pins, 4-30V) 20degrees=200mV
alternatively PT100 (passive element, needs voltage feed and conversion)
LM35 readout via a multimeter ---> online check ;-)
absolutely low-cost version: Digital multimeter with serial interface ---> Computer (no real DAQ;-))
Readout via ISM 111 ---> RS-485 (Protocols: Profibus-DP, Modbus-RTU und ASCII-Gantner ---> Conversion to normal RS-232 via ISK 100 ---> LabView
In order to use a more fancier protocol add a serial to TCP/IP controller


  © 2002 · Marc R. Stockmeier · Email email senden last update: 01/27/2003