40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Entry  Tue Mar 23 22:46:43 2010, Alberto, Update, 40m Upgrading, REFL11 upgraded 2010-03-23_REFL11_model_to_meas_comparison.png
    Reply  Wed Mar 24 14:57:21 2010, Alberto, Update, 40m Upgrading, REFL11 upgraded 
Message ID: 2711     Entry time: Wed Mar 24 14:57:21 2010     In reply to: 2704
Author: Alberto 
Type: Update 
Category: 40m Upgrading 
Subject: REFL11 upgraded 

 

 Hartmut suggested a possible explanation for the way the electronics transfer function starts picking up at ~50MHz. He said that the 10KOhm resistance in series with the Test Input connector of the box might have some parasitic capacitance that at high frequency lowers the input impedance.

Although Hartmut also admitted that considering the high frequency at which the effect is observed, anything can be happening with the electronics inside of the box.

ELOG V3.1.3-