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Wiring a AC half-bridge with 10mV excitation
AESlaughter
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04-03-2007 06:54 PM
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Hello,
I need some assistance getting started. I need to measure a thermistor with an AC Half Bridge w/ 10 mV excitation, apply a exitation of 2400mV, then take another AC Half Bridge w/10 mV excitation. I am attempting to wire an anemometer from www.east30sensors.com, which is designed for use with a Campbell datalogger, but I would prefer using LabVIEW. I don't really know where to start, any help would be greatly appreciated.
Thanks,
Andrew
I need some assistance getting started. I need to measure a thermistor with an AC Half Bridge w/ 10 mV excitation, apply a exitation of 2400mV, then take another AC Half Bridge w/10 mV excitation. I am attempting to wire an anemometer from www.east30sensors.com, which is designed for use with a Campbell datalogger, but I would prefer using LabVIEW. I don't really know where to start, any help would be greatly appreciated.
Thanks,
Andrew
Sandra_T
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04-04-2007 04:44 PM
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Hello Andrew,
What data acquisition hardware are you using?
I notice that you wanted to ake thermistor measurements and was wondering how to get started with your application. Take a look at the following resources:
Measuring Temperature with an RTD or Thermistor
Working with Thermistors and RTDs
Also take a look at the shipping examples. In LabVIEW click on Help>>Find Examples, then select Hardware Input and Output>>DAQmx>>Analog Measurement>>Temperature
Cont Acq Thermistor Samples-Int Clk.vi (would be good one to start with for thermistors)
I also took a look that the anemometer device from www.east30sensors.com. There isn't enough information about this device. Is there a data sheet? What output are expecting from this device? Will it be a voltage or current? What is the accuracy of the device? Those are all consideration you will have to make.
Regards,
Sandra T.
Applications Engineer | National Instruments
What data acquisition hardware are you using?
I notice that you wanted to ake thermistor measurements and was wondering how to get started with your application. Take a look at the following resources:
Measuring Temperature with an RTD or Thermistor
Working with Thermistors and RTDs
Also take a look at the shipping examples. In LabVIEW click on Help>>Find Examples, then select Hardware Input and Output>>DAQmx>>Analog Measurement>>Temperature
Cont Acq Thermistor Samples-Int Clk.vi (would be good one to start with for thermistors)
I also took a look that the anemometer device from www.east30sensors.com. There isn't enough information about this device. Is there a data sheet? What output are expecting from this device? Will it be a voltage or current? What is the accuracy of the device? Those are all consideration you will have to make.
Regards,
Sandra T.
Applications Engineer | National Instruments
04-05-2007 09:52 PM
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I am using a SCXI 1000 mainframe, SCXI 1200 Aquistion and Control Card, SCXI 1124, and a SCXI 1100.
The instrument information is limited, but this what I gathered from the Campbell program:
Anemomter: A thermistor reading using an AC Half Bridge in the 15mV slow range with voltage excitation at 10 mV. Also, this instrument requires a excitation of 2400 mV for 5 sec. to heat the sensor befor taking another thermistor reading.
Thermal Conductivity: Requires a thermocouple readings at various intervals (I have this working) during which the sensor is being heated via a Continous Analog Output of 1600 mV.
That is about all the information I can gather, thank you very much for taking the time to help out.
- Andrew
The instrument information is limited, but this what I gathered from the Campbell program:
Anemomter: A thermistor reading using an AC Half Bridge in the 15mV slow range with voltage excitation at 10 mV. Also, this instrument requires a excitation of 2400 mV for 5 sec. to heat the sensor befor taking another thermistor reading.
Thermal Conductivity: Requires a thermocouple readings at various intervals (I have this working) during which the sensor is being heated via a Continous Analog Output of 1600 mV.
That is about all the information I can gather, thank you very much for taking the time to help out.
- Andrew
