推荐回答（4个）
具体问题可以咨询专业机构，以便得到更专业的回答。
称重变送器也叫做重量变送器，是一种将物理量变换成电信号，将毫伏信号输出的传感器经隔离放大转换成标准直流信号的变送器。通常采用SMT工艺，针对工业过程的电阻应变式信号传感器而设计制造，适用于于不同规格称重传感器。
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负载在一定范围内变化时，电流输出型的电流基本不变（具有恒流特性），电压输出型的电压基本不变（具有稳压特性）。
一般来说变送器电流输出型的负载范围在0到几百欧姆，电压输出的大于1KΩ的多。
这和变送器的供电以及负载要求有关，所谓电流或电压型只能在一定条件下才能实现。
例如10V供电条件下，在大于1KΩ的负载上无论如何也产生不了大于10mA的恒流。
有些变送器的输出内部都做成电流型的，需要电压输出时通过内部电阻负载转换。这种变送器允许变化负载范围不大。当作为电压输出型时需将电流端子短路。当作为电流输出型时或者将电压转换电阻短路，或者并连一致稳压管（二极管）限压。后一种情况下如果负载阻抗较大，或输出电流较小时电压输出端是会有相应电压输出的，但负载阻抗较小，或输出电流较大时，电压输出端的电压会被限制在一个数值上。
所以你必须让变送器在不同输入条件下，变更负载电阻大小，看其反应，才能做出判断。
这样的信号发生器看起来像个万用表，可以测电阻，电流mA级，电压mv级，最主要的是可以产生0到20MA的信号电流及0到10V的电压，每次按百分之二十五的比例递增，同时可以显示测得的传感器的电流与电压的值，有实物用起来就顺利多了
我们是直接选用称重变送器SST4-LD，接应变片式称重传感器，输出电压和电流均可。感觉比较方便和稳定可靠。精度也容易保证。
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