keithley: DDC auto/range fixe again difference between 486,487 and 6512
485:
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commands are R0 auto, R1 2nA, R2 20nA, R3 200nA, R4 2uA, R5 20uA, R6 200uA, R7 2mA, R8 no range, R9 no range, R10 Disable autorange.
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The current range setting is read via Status Word and command U0, status word is different than for 486/487: 485CDRZKTMdMeY, R is the range as describe above.
486/487:
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commands are: R0 auto, R1 2nA, R2 20nA, R3 200nA, R4 2uA, R5 20uA, R6 200uA, R7 2mA, R8 no range, R9 no range, R10 Disable autorange.
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For 486/487 the current range setting is read via the status word and the command "U0" where range is Rmn with m =0 antorange off, m=1 autorange on and n the current active range.
6512:
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commands are R0 auto, R1 2pA, R2 20pA, R3 200pA, R4 2nA, R5 20nA, R6 200nA, R7 2uA, R8 20uA, R9 200uA, R10 2mA, R11 20mA, R12 Disable autorange.
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The current range setting is read via the status word and command U0, where the 2 digits at position 5(starting from 0), after model number (6512) and function (1 for AMPS). For instance the status word can be 6512100106.....