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这里介绍用AD693加上100Ω铂电阻RTD构成的测温探头。可测温度范围-100+266~℃,测温分为六个量程,总误差约±0.5℃,最大误差不超过±2℃。 电路如附图所示。除RTD和双列20脚封装AD693外,只需另加一只稳定性补偿电容C_c,就可以根据温度高低取得4～20mA标准传送电流(环流)输出。RTD可用双线式或三线型。整个探头是双线环供电结构,电源线和电流输出线公用。供电电压在
Introduced here with AD693 plus 100Ω platinum resistance RTD temperature probe. Measurable temperature range -100 +266 ~ ℃, temperature measurement is divided into six ranges, the total error of about ± 0.5 ℃, the maximum error does not exceed ± 2 ℃. Circuit shown in the figure. In addition to the RTD and the dual-in-the-box 20-lead AD693 package, a standard 4 to 20 mA transfer current (loop current) output is achieved with just a single stability compensation capacitor, C_c. RTD can be two-wire or three-wire type. The entire probe is a two-wire ring power supply structure, power lines and current output line common. Supply voltage at