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university:tools:m1k:hw [10 Nov 2015 20:54]
Brandon Bushey [Voltage Measurement]
university:tools:m1k:hw [22 Feb 2021 12:00] (current)
Mihai Ionut Suciu Add Rev F hardware data
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 ==== Voltage Measurement ==== ==== Voltage Measurement ====
  
 +See [[university:​tools:​m1k:​analog-inputs|this page]] covering the analog voltage inputs.
  
-TBD 
 ==== 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
 +
 +===== Revision F =====
 +
 +<WRAP round download>​
 +  * {{ :​university:​tools:​m1k:​02-037760-01-f.pdf |Rev F Schematics}}
 +  * {{ :​university:​tools:​m1k:​09-037760-01f.zip |Rev F Gerbers}} (This file is [[http://​www.7-zip.org/​7z.html|compressed]])
 +  * {{ :​university:​tools:​m1k:​05-037760-01-f2.zip |Rev F Bill of materials}} (This file is [[http://​www.7-zip.org/​7z.html|compressed]])
 +  * {{ :​university:​tools:​m1k:​08_037760f.zip |Rev F Allegro Board File }} (This file is [[http://​www.7-zip.org/​7z.html|compressed]]). Get the [[https://​www.cadence.com/​en_US/​home/​tools/​pcb-design-and-analysis/​allegro-downloads-start.html|Allegro FREE Physical Viewer]] to view.
 +
 +</​WRAP>​
university/tools/m1k/hw.1447185266.txt.gz · Last modified: 10 Nov 2015 20:54 by Brandon Bushey