SM0486
(1) In figure 9 the resistance thermometer is a four-terminal type.
Its
value is equated to a resistance which is determined by the switch position of the
Mueller bridge variable arm (R) shown in figure 9.
When the switches are
positioned so that the resistance X (resistance thermometer) is equal to the
resistance in the variable arm of the bridge, you determine the resistance and
temperature values by reading the dials on the bridge. Table 5 is a chart which
represents a partial list of resistance-temperature conversion values for a typical
base standard thermometer.
Figure 9.
Four-terminal connections to an equivalent Mueller bridge.
(2) When you examine the values listed in table 5, you find that the values
listed are products of the reference temperature resistance value (0 = 25.54900
ohm) and the ratio indicated by the dials on the measuring device. As an example,
examine values of the two columns in table 5, A, and values of the two columns of
table 5, B.
17
Previous Page
