circuit ground vs chassis ground

Can someone briefly explain what's the point of separating circuit ground from chassis ground with a capacitor + resistor?

• More context needed. – Andy aka Feb 21 '18 at 10:13
• I doubt that 150R is actually 150 ohms. It is very typical to use a 1 mega ohm resistor like that to bleed stray electrostatic charge. 1 meg effectively isolates the equipment ground from earth ground. – lakeweb Feb 22 '18 at 1:51
• Here is a good article on that. – lakeweb Feb 22 '18 at 2:06