BENTLY 本特利内华达 3500/42M 前置器/地震监测器

1. 当在系统中采用正反馈时，它通过将实际输入与反馈信号相加来增加系统的有效输入。相反，当系统使用负反馈时，它会从实际施加的输入中减去反馈信号，从而降低系统的总输入。

2. 在3500/42M中，输入和输出信号相位相似，因此这两个信号相加。而在负反馈中，输入和输出信号的相位不同，因此两者相减。

3. 在3500/42M电路中，同相输入端用于提供正反馈，而反相输入端用于提供负反馈。13365909307咨询

4. 包含正反馈的系统的总增益大于没有反馈的系统的增益。相反，具有负反馈的系统的总增益小于没有反馈的系统的增益。

5. 3500/42M电路提供的相移为0°或360°。而负反馈电路的相移是180°。

6. 与负反馈系统相比，正反馈系统不太稳定。

7. 正反馈系统提供的灵敏度低于负反馈系统。这是因为闭环系统的灵敏度是1 + GH的倒数。因此，如果1 + GH大于1那么灵敏度更低。而如果1 + GH小于1那么灵敏度更高。

   The 3500/42M Proximitor*/Seismic Monitoris a 4-channel
   monitorthat accepts input from proximity and seismic
   transducers, conditions the signal to provide various vibrations
   and position measurements, and compares the conditioned
   signals with user-programmable alarms.
   You can program each channel using the 3500 Rack
   Configuration Software to perform the following functions:
   > Radial vibration
   > Thrust position
   > Differential expansion
   > Eccentricity
   > REBAM*
   > Acceleration
   > Velocity
   > Shaft absolute
   > Circular acceptance region
   The monitor channels are programmed in pairs and can perform up to
   two of the aforementioned functions at a time. For example, Channels 1
   and 2 can perform one function while channels 3 and 4 perform another
   or the same function.
   The primary purpose of the 3500/42M Proximitor*/Seismic
   Monitoris to provide the following:
   n Machinery protection by continuously comparing monitored
   parameters against configured alarm setpoints to drive alarms
   n Essential machine information for both operations and maintenance
   personnel
   Each channel, depending on configuration, typically conditions
   its input signal to generate various parameters called static
   values. You can configure alert setpoints for each active static
   value and danger setpoints for any two of the active static
   values

   
   

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