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Input Noise ? - help!

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Su Ram

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I am trying test an Trans impedance amplifier circuit.. with charge pulses having rise times in several pico seconds..now when I connect the input signal to the BNC adapter which goes on to my PCB board the input signal just shoots up into oscillations as seen on an oscilloscope..but when I touch the ground plane with a multimeter probe the pulse comes back again..whats happening? Please help!
 

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