Multirange ohm meter design

  • Thread starter ahmadkza86
  • Start date
  • #1
Can someone help me to design the multirange ohm meter using permenant magnetic moving coil movement....
 

Answers and Replies

  • #2
1,482
3
Can you give more info on the "permenant magnetic moving coil movement"?
 
  • #3
Averagesupernova
Science Advisor
Gold Member
3,804
740
We had to do this in school. Is this homework?
 
  • #4
Integral
Staff Emeritus
Science Advisor
Gold Member
7,201
56
Can someone help me to design the multirange ohm meter using permenant magnetic moving coil movement....
One version is called a D'Arsonval movement.

The resistor in series (current mode) or parallel (voltage) determines the range. Figure the value of resistor to give you a range, then a switch to change ranges. Pretty basic stuff.
 
  • #5
Averagesupernova
Science Advisor
Gold Member
3,804
740
One version is called a D'Arsonval movement.

The resistor in series (current mode) or parallel (voltage) determines the range. Figure the value of resistor to give you a range, then a switch to change ranges. Pretty basic stuff.

He wants an ohmeter. What you've described (incorrectly) is used for measuring voltage and current as you stated. The resistor in parallel with the meter is used to measure current and is referred to as a shunt resistor. The series resistor is referred to as a multiplier resistor and this arrangement is used for measuring voltage.
-
Typically an ohmeter that uses the d'arsonval meter movement has a DC power supply in series with the meter movement also in series with resistance to be measured. The power supply voltage and series resistor are varied to get the range wanted. Digital ohmeters will use a current source hooked directly to the probes and the voltage across the probes is measured and converted to an ohms value.
 

Related Threads on Multirange ohm meter design

Replies
17
Views
4K
Replies
4
Views
742
Replies
10
Views
874
  • Last Post
Replies
10
Views
1K
  • Last Post
Replies
14
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
2
Views
547
  • Last Post
2
Replies
35
Views
11K
Top