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Digital control board documentation (view source)
Revision as of 15:53, 16 June 2009
, 15:53, 16 June 2009→Channel Descriptions: added DACHealth
| ADC_EXT2
| ADC_EXT2
| This trace routes to the backplane via Eurocard pin A8. It is intended to measure one of the transistor base voltages on the amplifier board.
| This trace routes to the backplane via Eurocard pin A8. It is intended to measure one of the transistor base voltages on the amplifier board.
|-
| VIN7
| 9
| DACHEALTH
| This channel monitors the output of a resistor divider connected to channel 31 of the DAC. The divider consists of three resistors of 200K, 200K, and 10.2K (in order). The ADC reads out the voltage level between the second 200K and then 10.2K resistor. These resistors were selected so that at 200V, the readout voltage will be 4.878V. Since the divider should be linear, the expected voltage at 20V is 0.4878V. Three resistors were used rather than two to avoid exceeding the resistors' power ratings when the DAC is set to its maximum voltage. Note that since this divider will consume up to 484uA of current at 200V, this DAC channel should not be used for anything that might require more than ~200uA of current. The channel is routed to the backplane nonetheless.
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