Log entry time 10:19:23 on January 28, 2012

Entry number 362031

This entry is a followup to: 362030

Followups:

• 362032 01/28/12 10:27 asymmetry test signal
• 362038 01/28/12 15:01 Pengjia happex asymmetry test by using local helicity control board
• 362039 01/28/12 15:35 Chao scaler bcm asymmetry test

We use local helicity control board for testing the asymmetry in happex crate and scaler, and use happex timing board DAC to generate 600ppm asymmetry signal(1.254344V for +helicity and 1.25282V for -), use attenuator box fan module to generate 5.3% asymmetry signal(568mV for + and 632mV for -), both happex and scaler can get right asymmetry value, shown in attachment.We can let hallC to do the same test.

local helicity control board setting: Mode:Free Clock T_Settle:70us T_Stable:1000us Helicity Pattern:Quartet Delay:8 windows

Injector helicity control board setting: Mode:Free Clock T_Settle:70us T_Stable:971.65us Helicity Pattern:Quartet Delay:8 windows

happex_left_upstream_asym

happex_left_downstream_asym

happex_right_upstream_asym

happex_right_downstream_asym

scaler_right_upstream_asym

scaler_right_downstream_asym