The ring heater for ETMY was disconnected from the chassis. The power of the chassis was already off, since we were not using it. A special cable which shorts all ring heater segments together was connected to the output of an SR560. The SR560 ground was connected to the ESD driver ground, while its input is driven by the PEM DAC (H1:PEM-EY_GDS_1_EXC). A drive of 12000 counts corresponds to about 1.8Vpp.