Dear Forum members:
I have released Part two of how to measure a 0.001 Ohm Shunt using an HP/Agilent 3457A and some external equipment.
I am essensially implementing a four wire ohmmenter with offset compensation using some bench
equipment.
Implementation details:
- External current source is used to replaced the current source inside an ohmmeter.
- Both the front and rear panel terminals of the 3457A are used to measure the voltage
drop across two shunts: The shunt under test, and another shunt that we know it's resistance
value precisely. The precisely known resistance is used to compute the current.
- A GPIB controlled swith is used to turn off the current and obtained a residual reading, this will be
known as the "thermal voltage" which we will later subtract.
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