Craig, Georgia

We calibrated the EFM output channels H1:PEM-EX_EFM_BSC9_ETMX_X_OUT_DQ and H1:PEM-EX_EFM_BSC9_ETMX_Y_OUT_DQ from counts to volts/meter, starting on May 31, 2018 at around 21:00:00 UTC.

Volts to electric field calibration was done according to alog 42250:
X Cal Volts to Electric Field = 37.38 (V/m)/Vcal
Y Cal Volts to Electric Field = 37.43 (V/m)/Vcal

Counts to volts were calibrated using 40/2**16, since we have a 16 bit ADC with a +20 to -20 volt dynamic range.

Both of these gains were added to the H1PEMEX_EX_EFM_BSC9_ETMX_X and H1PEMEX_EX_EFM_BSC9_ETMX_Y filter modules, which are located under /opt/rtcds/lho/h1/medm/h1pemex/.