How do you measure temperature with a diode?
824652
Generally speaking, an increase in temperature leads to an increase in electrical conductivity. \n\nMany multimeters today include a feature that can allow us to use them as digital thermometers, by plugging in the appropriate probe. \n\nIf you have such a digital multimeter (try Radio Shack for an inexpensive one) they may sell probes ready made, or you can try to make your own using a typical diode (1N4004 silicon,  or 1N34 germanium, or similar) as a probe. \n\nThe forward voltage drop across a silicon diode is about 0.6 volts, across a gemainium diode is about 0.34 volts. Calibrate your probe by dunking it into an ice bath (zero centigrade) and then into boiling water (200 centigrade). Record the voltage drop across the diode at those temperatures. Make sure it is properly encapsulated (use silicone rubber, if you are making your own) and let it return to ambient temperature before making subesquent measurements.\n\nWith a little effort, you should be able to develop a chart with which to convert the voltage reading to a temperature measurement. (Use graph paper.) If you have the right kind of diode, it should be fairly linear. If you are in doubt, try some measurements at temperatures in between the extremes and compare to a known good thermometer.\n\n20 NOV 06, 0320 hrs, GMT.
867378
A way to make sure the capacitance doesn't change with temperature.  This can be done by selecting a suitable dialectric material to make the capacitor, as with "NP0" capacitors (NP0 means "negative-positive zero," meaning no - or + temp. coefficient).  One could also design a circuit to compensate for capacitance changes due to temp, such as, using a thermistor and transistor to provide a voltage that varies with temperature, and applying it to a vari-cap placed in parallel with the capacitor.
199541
You will need to get a DMM (digital multi meter)...Walmart has these pretty cheap.  \n\n1) Before doing anything else, check the fuses again.\n\n2) Unlug your fan from the harness it is comming from.  Put the DMM on continuity (ohms) or if it has the tone option, put it there.  Now put the 2 leads together (probe to probe). Take note of what the display says.  Now put one probe on one wire comming from the plug on the fan, and do the same with the other probe on the other pin. Your display should read the same (continuity) or beep.  If it does, your fan is good.\n\n3) Now put that DMM on DC voltage (12 volt range up to 25, depending on DMM).  Again, one lead on one wire, other lead to the other wire.  Start your car, and turn on your a/c (this activates the fan circuit regardless of temperature).  If you get power, you know your relay is fine.  Now turn off your a/c and let the engine heat up to normal.  If your power does not come back, you have a temperature switch gone bad.  If it does, you have a problem with the fan (which you should have found in the last step).\n\nHope this helps!
813595
a thermistor is a resistor whose resistance changes with temperature. Because of the known dependence of resistance on temperature, the resistor can be used as a temperature sensor.\n\nSo, add a thermistor into a simple circuit with a power supply and a meter to measure current and you have the essence of a device to measure temperature.\n\nGet a bucket, fill it with ice and leave it till the ice has half melted. The temperatue of the water will be 0 degrees C. Pop in the thermistor (suitably electrically insulated) and measure the current.\n\nBoil a pan of water on the stove. As it's bubbling the water will be exactly 100 Degrees C, and again measure the current.\n\nUsing both values you can calibrate your new electronic thermometer!
521856
Constant current source, diode junction for temperature sensing, and a gain/offset circuit for scaling to 10mV/deg C.\n\nIf you look at the diagram in the product folder, its pretty easy to see whats going on.\nhttp://www.national.com/pf/LM/LM35.html\n\nThey get the accuracy without taking 2 measurements at different current levels, as is commonly done in diode temperature sensors, by wafer trimming.... which is why the LM35 costs so much more, than a simple diode sensor. The current source, and gain/offset circuitry uses minimal real estate on the die, with interconnects and physicial handling issues consuming almost as much as the circuit needs. The cost is a funtion of the extra time needed for trimming, and of course the manufacturing yield.
59686
There are several ways to do this:\n1. thermocouples\n2. thermionics\n3. thermophotovoltaics\netc\n4. thermal diodes
893197
Try a histogram and use a range of temperatures.
673504
Choosing a proper thermocouple type for your application depends primarily on the temperature range in which its use is intended. The most widely used and available thermocouples are types "K "and "J", however there are several other types that you should consider.\n\nTo determine which thermocouple type best suits your application's temperature range, refer to the individual data pages for each thermocouple type (J, K, T, E, R or S). These pages include a temperature range and accuracy graph you can use for comparison with your measurement requirements.
1172522
no difference in temp reading; it's just a sanitary measure
25444
You could try to make an accurate experimental thermometer by glueing two strips of dissimilar metals together along their lengths. Perhaps try copper and steel or copper and aluminum or steel and aluminum.  Try perhaps one half inch wide by six inch long strips.  Use sheets of metal that are equally thin.  Perhaps cut the strips from aluminum soda cans and steel soup cans, etc.  Use a magnet to check for steel vs aluminum.  Glue the strips together using epoxy or super glue.  Attach one end of the combined strip to a firm base and leave one end free to move in front of a paper scale.  You now have a bimetalic thermometer.  The thermometer can be made to be more sensitive by using greater length strips and bending the strips into a spiral and attaching a pointer to the free end of the spiral to amplify movement.  This is how most oven thermometers are built except the metals are joined without glue.  The principal of operation of a bimetalic thermometer is that one  metal expands or contracts more or less than another metal.  When joined, a temperature change causes the combined strip to bend.  You can calibrate your thermometer by marking its "pointer" position at two or more large temperature changes then calculating the total deflection divided by the total temperature difference to get deflection per degree (either F or C).  Be careful with tin snips and epoxy or super glue.  Good luck.\n\nAs an alternative, you can make a highly accurate experimental thermometer by winding very thin insulated copper wire (like that used in toy motors) around a wooden spool and connecting the scraped   wire ends to an accurate ohmmeter to measure resistance change vs temperature change.  Calibrate as before but remember that calibration temperatures must be steady long enough for any lag to catch up.  This is called a resitance thermometer and accuracy will depend on the length and thinness of wire and sensitivity of your ohmmeter.  Also the ohmmeter should not cause enough current to flow in the wire to heat the wire.  Observe for drift (increase in resistance and temperature) while taking measurements.
505556
you have to look for it at the saturated watter boards or the saturated water graph, then the temperature will tbe the saturation temperature, according to my graph, the temperature would be...\n\n83.79ºC
10501
From Fahrenheit = (value - 32) / 1.80\n\nor use http://www.csun.edu/~jmj2600/hw4.html
379801
This website does all the work.  Just put in the values!  Good luck.  http://www.onlineconversion.com/temperature.htm
594266
6000 K (aprox 6000 ºC)\nThese are actual measurements. You don´t need to put a termometer or to actually GO there to know that. \nThere are other ways, typically involving light spectrum analysis, to accurately measure that.
137298
http://www.albireo.ch/temperatureconverter/
380685
1)Remember that a calories is a measure of the heat it takes \n  to raise 1 degree of the water temperature.\n2)A Calorimeter helps you measure among other thing the\nheat of fusion and since we know the heat of fusion of water its easier to calculate the heat of fusion of other things.
715037
Ok-i'm not quite sure if i did this right--we covered this last year--so you might want to double check with your textbook or teacher, or whatever resource you have...\n\nwhat i would do is find the final temperature:\nFinal Temperature=(V2 * T1) / V1\n\nand then use the delta T, delta v, and P to find delta E.\n\nbut i'm really not that sure.\n\nsorry that i wasnt a better help!