Series 3700 System Switch/Multimeter User's Manual
Section 5: Basic Digital Multimeter (DMM) Operation
3700S-900-01 Rev. C / July 2008
5-61
scan.execute(buf)
for x=1, buf.n do printbuffer (x,x,buf) end
channel.open("allslots")
endscript
Thermistors
The temperature measurement range for thermistors is -80°C to 150°C (0.01°
resolution). Thermistor types that are supported include the 2.2k , 5k , and
10k types.
The thermistor is a temperature sensitive resistor. Its resistance changes non-
linearly with changes in temperature. Most thermistors have a negative
temperature coefficient. As temperature increases, the resistance decreases.
The Series 3700 measures the resistance of the thermistor and calculates the
temperature reading.
Of all the temperature transducers, the thermistor is the most sensitive. It can
detect minute changes in temperature. It is a good choice when measuring slight
changes in temperature. The downside for this increased sensitivity is the loss of
linearity. Because they are especially non-linear at high temperatures, it is best
to use them for measurements below 100°C.
NOTE
Curve fitting constants are used in the equation to calculate thermistor
temperature. The thermistor manufacturer’s specified curve fitting may
not be exactly the same as the ones used by the Series 3700.