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| university:tools:m1k:hw [08 Dec 2014 20:57] – change section indents Robin Getz | university:tools:m1k:hw [14 Mar 2023 06:47] (current) – updated the design files download link Joyce Velasco | ||
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| ===== Introduction ===== | ===== Introduction ===== | ||
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| + | {{ : | ||
| The [[adi> | The [[adi> | ||
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| ==== Voltage Measurement ==== | ==== Voltage Measurement ==== | ||
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| + | See [[university: | ||
| ==== Current Measurement ==== | ==== Current Measurement ==== | ||
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| In the pursuit of an affordable device for use as a first pass when working with unknown powered or unpowered systems, careful consideration was given to the output stage of the device. A spurious voltage spike from a fluxed-up inductive coil or accidental connection to an external battery ought not to immediately cause damage to the device. It should be trivial to afford measurement of voltages and currents substantially outside of the native range. It should also be feasible to render the device in a state such that it is capable of measuring signals of very little current, like the potential produced by a pH probe, or that of a thermocouple. These seemingly conflicting requirements gave rise to a versatile output stage built around a four channel low-resistance switch, offering fifty ohm tie resistors to half-potential and zero potential, as well as independent connections to the output connection and the output of the power driver. This configuration allows for a single external resistor to divide voltages or currents down to levels within the range of the measurement stages. Diode clamps to the high rails | In the pursuit of an affordable device for use as a first pass when working with unknown powered or unpowered systems, careful consideration was given to the output stage of the device. A spurious voltage spike from a fluxed-up inductive coil or accidental connection to an external battery ought not to immediately cause damage to the device. It should be trivial to afford measurement of voltages and currents substantially outside of the native range. It should also be feasible to render the device in a state such that it is capable of measuring signals of very little current, like the potential produced by a pH probe, or that of a thermocouple. These seemingly conflicting requirements gave rise to a versatile output stage built around a four channel low-resistance switch, offering fifty ohm tie resistors to half-potential and zero potential, as well as independent connections to the output connection and the output of the power driver. This configuration allows for a single external resistor to divide voltages or currents down to levels within the range of the measurement stages. Diode clamps to the high rails | ||
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| + | ===== Schematic, PCB Layout, Bill of Materials ===== | ||
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| + | <WRAP round download> | ||
| + | [[adi> | ||
| + | * Schematic | ||
| + | * PCB Layout | ||
| + | * Bill of Materials | ||
| + | * Allegro Project (get the [[https:// | ||
| + | </ | ||
university/tools/m1k/hw.txt · Last modified: 14 Mar 2023 06:47 by Joyce Velasco