[Jeff, Torrey]

We had previously reported on some high frequency modulations in the error signal while locking the cavities with the piezo and EVAL-ADHV4702-1CPZ amplifier. 

This is an opamp with the standard differential input, and I (Jeff) previously created this this splitter doohicky to connect the input ground to the negative port of the amplifier and the input signal to the positive port. 

We found that upon removing this from the setup we successfully removed the spurrious pulses from the error signal. Currently the negative input of the amplifier is SMA terminated to the ground of the amplifier, and the input is connected to the positive input.