== Calibration work memo 2018/4/28 09:00-  ==
Site worker : T.Yamamoto(leader), S.Haino, Y.Inoue, S. Tsuchida, A.Miyamoto, T.Yokozawa

=== Free swinging ===
 * 09:25 Unlock michelson

 * 9:32 Started line injection to BS
  * K1:LSC-REFLAIR_A_RF17_Q_ERR_256_DQ (RF signal of PD)
  * K1:LSC-REFLAIR_B_LF_OUT_256_DQ (DC signal of PD)
  * K1:CAL-CS_LINE_LINE8_LKIN_OSC_FREQ (injection line frequency)
  * K1:CAL-CS_LINE_MTRX_1_8 (Amplitude of calibration line)

Table of line injection to BS
|| Time || Freq[Hz] || amp[count] ||
|| 9:25 || 0.0 || 0 ||
|| 9:32 || 0.2 || 5 ||
|| 9:33 || 0.2 || 10 ||
|| 9:34 || 0.2 || 20 ||
|| 9:36 || 0.2 || 100 ||
|| 9:47 || 0.2 || 250 ||
|| 9:53 || 0.2 || 500 ||

 * 10:10 Finish free swining measurement

 * Offline analysis
  * /users/CAL/PHASE1/scripts/EllipseFitting.C

 * Pre-offline best result  [[attachment:openloop_best|png]]

2*pi*2A/lambda = 1.00e+11[cnt/m] = 3.00e+14[cnt/strain]


 * 11:35 Open loop transfer function measurement
  * template diaggui /users/CAL/PHASE1/templates/DTT/T_OPTF.dtt.xml

  * 1st measurement : /users/CAL/PHASE1/measurements/DTT/T_OLTF/T_OLTF_180428_114110.xml
  * 2nd measurement : /users/CAL/PHASE1/measurements/DTT/T_OLTF/T_OLTF_180428_115610.xml
  * 3rd measurement : /users/CAL/PHASE1/measurements/DTT/T_OLTF/T_OLTF_180428_124641.xml

 * 12:15 Coil driver transfer function measurement
  * transfer function measurement between coilout and FC
  * EXC(K1:VIS-BS_TM_COILOUTF_H4_EXC) MEADURE(K1:VIS-BS_SCMON_TM_H4)
   * Be careful, channel name is including SC, but connect to FC.

 * ??:?? Modified calibration model(C00 Strain)
  * z-8 delay between error and control
  * optical gain

 * Discussed about unknown time delay (1block:1/16384=61usec)
  * 3 known block delay : LSC->BS, DAC, LSC->CAL?
  * aAA, dAA, aAI, dAI
  * iKAGRA has 130usec unknown delay...

 * ??:?? Start Open loop transfer function measurement
  * with envelop, measurement accuracy becomes much better!
  
  * measurements : /users/CAL/PHASE1/measurements/DTT/T_OLTF/T_OLTF_180428_******.xml