The monitor point reads 13V, and the ADC reads -20000cts, even with the input terminated.
The busted channel (CH4 is used for the green y-arm transmitted power, and was temporarily used for ITMY dither alignment by hooking it up to POB18_Q.
Comments related to this report
daniel.sigg@LIGO.ORG - 12:47, Thursday 06 March 2014 (10586)
These are current amplifiers with a -5V dc bias and 1k series resistor. They are only intended for unamplified photodiodes! Grounding them produces a 5mA current which can rail the output (depending on the selected gain). D1200543.
These are current amplifiers with a -5V dc bias and 1k series resistor. They are only intended for unamplified photodiodes! Grounding them produces a 5mA current which can rail the output (depending on the selected gain). D1200543.