[Jennie, Masayuki]

Using the power measurement by Jennie et al. on Feb 24, I calibrated the TRANS PD.

Channels used:
    •    H1:JAC-TRANS_A_DC_DCCURRENT (Beckhoff)
    •    H1:JAC-TRANS_A_LF_INMON (fast)

Offset was difficult to estimate, so it was assumed to be zero.

With 1 W input from the IMC, the signals were
    •    0.00185 A (Beckhoff)
    •    261.2 counts (fast)

According to Jennie’s alog, the power on the PD was 37 µW, giving a responsivity of

37uW/0.00185A ~ 0.02 W/A

Using HAM1 output = 96 mW for 100 mW JAC input, the effective pick-off reflectivity is

37uW/(96mW*10)= 38.5ppm

Accounting for the mW→W conversion factor (×1000), the effective pick-off fraction is ~3.85(%).