DCN for schematic changes to aLIGO HAM Auxilary and Tip/Tilt SUS Coil Driver

Document #:

LIGO-E1201036-x0

Document type:

E - Engineering documents

Abstract:

A change to a schematic from revision v2 to v3

Files in Document:

None

Topics:

• Suspensions

Authors:

• Mohana Mageswaran
• Rich Abbott
• Rolf Bork
• David Feldbaum

Keywords:

DCN HAM Auxilary Tip/Tilt Suspension Coil Driver

Notes and Changes:

The existing aLIGO boards are manufactured using v2 PCB's. Revison v3 includes a change in value of the series resistors R11 and R33 from 100 Ohms to 1.2K Ohm.

The 100 Ohm resistor provide an actuation range factor of 10 larger than which can be observed by the OSEMs. It can contribute to the noise.

Related Documents:

• LIGO-E1201027-v1: ECR: Replacement of the coil-series resistors in the HAM-A coil drivers

Referenced by: