横河仪器测量电路简单介绍
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Measuring Circuit.
shows a simplified schematic for the
ER180 recorder with manual range selector unit-6
thermocouple inputs and 2 ranges. In the standard
ER-180 recorder with thermcoouple input, a slidewire
resistor with non-linear resistance perunit length
is used to correct for the non-linearity （ 记录笔、记录纸 ）
of thermocouple input. However, in the recorder
with manual range selector unit, linearizer circuits
are used for respective ranges to correct for the
thermocouple's non-linearity (the slidewire resistor
is linear). The linearizer's input-output characteristic
is made to agree with the thermocouple. The
linearizer converts the thermocouple.
Figure 4-2 shows a simplified schematic for the
ER-180 recorder with manual range selector unit RTDs input,
6 measuring points and 2 ranges. As RTDs have comparatvely
low resistances, relay contacts are used in the range selector
circuit to minimize the circuit resistance.

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