| 1 | # dimctrl script
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| 2 | >
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| 3 | > -------------------------------------------
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| 4 | > Bias and Feedback StartUp (Current Calibration)
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| 5 | > -------------------------------------------
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| 6 |
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| 7 | .w 2000
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| 8 | # As a First step we want to calibrate the current, which are read from the bias crate,
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| 9 | # and not take a DRS calibration, as it is mentioned in the data taking page...
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| 10 | # so for this we should get the feedback and biasctrl programs into known states
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| 11 | # I think it is good to try a RECONNECT to the bias, and make sure the voltage is off
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| 12 | #
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| 13 | # NOTE:
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| 14 | # The ideas in the line above are both valid, but both not done.
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| 15 | # This is *not good*
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| 16 |
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| 17 | # Since we do not know, what the feedback program is doing at the moment, we should as well,
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| 18 | # tell it to keep its mouth shut ... just to be sure, we know whats going on
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| 19 | > stopping feedback
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| 20 | FEEDBACK/STOP
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| 21 | .w 2000
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| 22 | # stopping should always be possible, and end in state 'Connected'(6)
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| 23 | .s FEEDBACK 6
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| 24 | > ..done
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| 25 |
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| 26 | #BIAS_CONTROL/RECONNECT
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| 27 | # If we were disconnected, and this was the first try of the night, the bias_ctrl should
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| 28 | # be in state 'VoltageOff'(7) more or less immediately
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| 29 | #.s BIAS_CONTROL 3
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| 30 | #.s BIAS_CONTROL 7 5000
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| 31 | # if these assumptions are all wrong, then we might have been properly connected anyway,
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| 32 | # and just have to ramp down... lets do it, but wait forever, in case it does not work
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| 33 | > switching off bias
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| 34 | BIAS_CONTROL/SET_ZERO_VOLTAGE
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| 35 | .w 2000
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| 36 | .s BIAS_CONTROL 7
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| 37 | > ...done
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| 38 |
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| 39 | # in case we reach this line, the voltages are all off, and the feedback does not do anything
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| 40 | # So lets do the current calibration, therefor we tell the bias crate to ramp up just 1 single DAC count(~22mV)
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| 41 | # the result of this action is, to get bias_ctrl into the state 'VoltageOn'(9), but since we only go one DAC count it shouldn't take long
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| 42 | > setting bias globally to 1 DAC
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| 43 | BIAS_CONTROL/SET_GLOBAL_DAC 1
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| 44 | .w 2000
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| 45 | .s BIAS_CONTROL 9
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| 46 | > ...done
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| 47 |
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| 48 | # now we may tell the feedback program to calibrate the currents ...
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| 49 | # I do not understand, if I have to explicitely allow the feedback program to generate output,
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| 50 | # or if it just produces output...
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| 51 | # As far as I understand, the feedback output enable status is the same,
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| 52 | # as it was before I send the STOP command... so it is unknown at this point.
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| 53 | # and in addition enabling or disabling the output, when STOPed is not possible as far as I know...
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| 54 | # I try to enable it anyway.
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| 55 | > enabling output for feedback
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| 56 | FEEDBACK/ENABLE_OUTPUT yes
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| 57 | .w 2000
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| 58 | > ...done
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| 59 |
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| 60 | > calibrating bias crate current readings...
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| 61 | FEEDBACK/CALIBRATE_CURRENTS
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| 62 | .w 5000
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| 63 | # in order to find out when the calibration ends, we have to wait for the transistion from state
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| 64 | # 'Calibrating'(13) back to 'Connected'(6)
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| 65 | .s FEEDBACK 13
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| 66 | .s FEEDBACK 6
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| 67 |
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| 68 | # Thomas Bretz told me, that the feedback, after this step has disabled its output
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| 69 | # and is in the mode, we might call 'temperature control' even there is no temerature beeing controlled.
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| 70 | # I don't know where the voltage is ... in order to perform the calibration, the feedback had to
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| 71 | # ramp up to 2V below the operational voltage, i.e. about 1V below the breakdown voltage
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| 72 |
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| 73 | # We want to take a DRS amplitude calibration so we have to ramp down the bias voltage.
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| 74 | # this 10sec wait is needed in order for the bias not to disconect all the time...
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| 75 | > ... current calibration done
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| 76 | .w 10000
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| 77 |
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| 78 | > switching off bias
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| 79 | BIAS_CONTROL/SET_ZERO_VOLTAGE
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| 80 | .w 5000
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| 81 | .s BIAS_CONTROL 7
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| 82 | > ...done
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| 83 |
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| 84 | # now we want to take a run, with dark counts events
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| 85 | # so we need to ramp up the voltage
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| 86 | # we want to use the 'current control' more so we give the commands for this...
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| 87 | > switching on current controll feedback ...
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| 88 | FEEDBACK/STOP
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| 89 | FEEDBACK/START_CURRENT_CONTROL 0.0
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| 90 | FEEDBACK/ENABLE_OUTPUT yes
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| 91 | # the feedback should be in state 'CurrentControl'(12) now
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| 92 | .s FEEDBACK 12
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| 93 | > ... done
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| 94 | > switching on bias
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| 95 | # now we give the feedback a hint, that it may ramp ...
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| 96 | BIAS_CONTROL/SET_GLOBAL_DAC 1
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| 97 | # after this command the bias_ctrl should be in state 'VoltageOn'(9) after a second or so
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| 98 | .s BIAS_CONTROL 9
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| 99 | > ...1 DAC globally set
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| 100 | # then usually it takes some time until the feedback has enough information to really start controlling the voltage
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| 101 | # when the feedback actually kicks in, the bias is first in state 'Ramping'(5) for some seconds and finally in 'VoltageOn'(9)
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| 102 | # again
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| 103 | .s BIAS_CONTROL 5
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| 104 | > ...ramping to nominal voltage
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| 105 | .s BIAS_CONTROL 9
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| 106 | > ...bias on
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| 107 | # here we should wait 45 sec in order for the current control to get enough current readings and temp readings to stabilize..
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| 108 | > waiting 45sec for the current control to stabilize...
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| 109 | .w 45000
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| 110 | > ... done
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| 111 |
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| 112 |
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| 113 | # at the end the bias voltage should be ramped down, since in a few seconds a shifter wit ha flashlight
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| 114 | # will come out to open the shutter...
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| 115 | > switching OFF bias ...
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| 116 | BIAS_CONTROL/SET_ZERO_VOLTAGE
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| 117 | .s BIAS_CONTROL 7
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| 118 | > ...done
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| 119 | > ----------------------------------------------------
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| 120 | > Bias and Feedback StartUp (Current Calibration)
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| 121 | > ... done.
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| 122 | > ----------------------------------------------------
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| 123 | >
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