Look the calibration to understand what and when has been changed in our electronics

A. Maslennikov, 26 February 2010, HiLum workshop

November 08 logbook:

11.11.2008 - 14:30 J.F.:

Following Evgeny, for MEDIUM gain 10 Ohm SMD resistors were soldered to 50 Ohm SMD resistors on front-end board resulting into 8.33 Ohm. As the consequence the gain for MEDIUM gain should be increased. LOW gain untouched.

In fact, the transition has taken place between 18 April and 07 November 2008,see next slides.

HEC shape - 18 April 2008 (gen 109, ch1:2, DAC= 5 000 top, 50 000 bottom)

EMEC shape - 18 April 2008 (gen 117, ch1:2, DAC= 5 000 top, 50 000 bottom)

HEC shape - 07 Nov 2008 (gen 109, ch1:2, DAC= 5 000 top, 50 000 bottom)

EMEC shape - 07 Nov 2008 (gen 117, ch1:2, DAC= 5 000 top, 50 000 bottom)

Next major intervention was in September 09 (two slides from E. Ladygin, HiLum meeting 21 Sept 09)

FEB’s

• burned board has been repaired

• second board has been prepared

• fuses & zener diodes have been installed on both boards

Next slide

Photo

Question (A.M.): may these Zener diodes provoque the wiggles ?