Internal resistance of an ammeter

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SUMMARY

The forum discussion focuses on devising a non-destructive method to measure the internal resistance of a 0-1mA ammeter using circuit components without exceeding 1 mA of current. A user reported using Multisim simulation, yielding an internal resistance of 1 micro-ohm, but expressed uncertainty about the accuracy of this measurement. Participants discussed alternative methods, including reading voltage across a current shunt and the ammeter, to clarify the measurement setup and improve understanding of the circuit design.

PREREQUISITES
  • Understanding of Ohm's Law (v=ir)
  • Familiarity with circuit simulation tools like Multisim
  • Knowledge of current shunt resistors and their applications
  • Basic circuit design principles for non-destructive testing
NEXT STEPS
  • Research how to set up a current shunt measurement circuit
  • Learn about the principles of non-destructive testing in electrical measurements
  • Explore advanced features of Multisim for circuit analysis
  • Study the characteristics and calibration of ammeters
USEFUL FOR

Students in electrical engineering, hobbyists working with circuit design, and professionals involved in non-destructive testing of electronic components will benefit from this discussion.

jmckennon
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Homework Statement


Devise a NON DESTRUCTIVE scheme to measure the resistance of the 0-1mA meter that is provided in the lab. You may make use of an external power supply (or battery) and other circuit components such as resistors to make your measurement. Design your measurement scheme so that no more than 1 mA will flow through the meter! You can not use the multimeter as an ohmmeter to make this measurement!

Homework Equations



v=ir

The Attempt at a Solution



I used a multisim simulation for the circuit. I ended up getting the internal resistance to be 1 micro ohm but I am not sure if that is correct, as i used the values provided by the voltmeter and ammeter in the circuit.

https://email.umassd.edu/src/download.php?startMessage=1&passed_id=2201&mailbox=INBOX&ent_id=2&passed_ent_id=0



here is our design.

Is this done correctly?
 
Last edited by a moderator:
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Sorry, here is the design
 

Attachments

I can't see your attachment yet (waiting approval). But why can't you just read the voltage off a current shunt and across the current meter itself?
 
I guess the wording of the question is getting pretty jumbled in my head. what would that circuit look like? I'm not exactly sure how to read or set up that up. How would i set up is up so i can read the voltage off a current shunt and across the meter itself? I'm just hella confused here
 

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