What is the purpose of Captive Screw in Modules of IRD8800 Series?

4 Numbers of Captive Screws are provided per Module in IRD8800 Series systems. They serve the following purpose:

1. They provide means to mechanically secure the modules to the Rack.
   
2. They provide Electrical and Electronic earth to the modules via the Metal-to-Metal contact with the Rack
   
3. They serve as anchor points and help in pulling out the module from the Rack slot
   

Captive Screw of IRD8800 Modules

If the Captive screws are not tightened - the electrical or electronic earth can become incomplete and noise may not get removed from module. This noise will appear as a small reading in absence of actual vibration. If the noise does not get removed after tightening of the captive screw - then any reading in absence of actual vibration indicates a Zero error (Zero Tare Calibration needed)

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