Glitches in the Blend Switch - Origin and Fix

Document #:

LIGO-T1400284-v2

Document type:

T - Technical notes

Abstract:

We show that the glitches in the Blend Switching result from a the combination of large T240 signals getting switched in with a sharp cornered blend ramp and amplified by Level 3 controllers with high gain at high frequency. A smoother ramp has been implemented to fix the issue

Files in Document:

• T1400284_Blend_Glitch_v2.pdf (file is not accessible)

Topics:

• Seismic Isolation
• Integration
• Suspensions
• State Control and Monitoring

Authors:

• Brian Lantz

Keywords:

BSC ISI HAM SEI blend switch glitch

Related Documents:

• LIGO-T1200126: Blend Switching User Guide
• LIGO-T1300510: Smooth Polynomial Ramp for SEI turnon

Referenced by:

• LIGO-T1800031-v2: Smooth Ramp for Isolation Turnoff