An ohmmeter scale is nonlinear which means the value of one line or calibration may not be true to other lines. It is therefore proper to assign values to every line for proper and accurate interpretation

6. 1.

7. 2.

8. 3.

9. 4.

10. 5.

11. Why do we need to measure different physical quantities in real
life?

13. 1. Know the value of individual
calibration in the ohmmeter scale.
An ohmmeter scale is nonlinear which means the value of one
line or calibration may not be true to other lines.
It is therefore proper to assign values to every line for proper
and accurate interpretation

14. The areas involved are
1.) 0- 2, 2.) 2-10,
3.) 10 -20, 4.) 20-50,
5.) 50 - 100, 6.) 100- 200,
7.) 200 - 300, 8.) 300 - 500.
9.) 500-1K 10.) 1K-2K
2. The scale can be divided into ten areas where individual
treatment has to be made.
Several mathematical computations will be involved to
show the manner how values of individual lines are
resolved.

15. 3. Range multipliers: RX1, RX10,
RX1K, RX10K
Range Multiplier- The portion of the ohmmeter where the actual
reading is being multiplied.
Note: If Rx is greater than 1,000 ohms, and the R x 1 range is
being used, the ohmmeter cannot measure it.

16. Scale Reading

17. Student’s Activity
Scale Reading
Divide the class into five groups.
Identify the value of each line(calibration).
Group 1: 0-2 area and 2-10 area
Group 2: 10-20 and 20-50
Group 3: 50-100 and 100-200
Group 4: 200-300 and 300-500
Group 5: 500-1000 and 1000-2000

18. Each group will identify the value of each line/calibration in every area
assigned to them.
Group 1: 0-2 area and 2-10 area
Group 2: 10-20 and 20-50
Group 3: 50-100 and 100-200
Group 4: 200-300 and 300-500
Group 5: 500-1000 and 1000-2000

19. 1.) 0- 2,
Value of 1calibration = line distance / total calibrations involved
For 0- 2:
Line distance = 2
Total no. of cal = 10
Value of 1 line = 2/10 = 0.2
0.2, 0.4, 0.6, 0.8, 1, 1.2, 1.4, 1.6, 1.8, 2

20. 1.8
1.) 0- 2,
Value of 1 line
= 2/10 = 0.2
1.4
1.6
1
1.2
0.60.8
2
0.4 0.2

21. 2.) 2 - 10,
Value of 1calibration = line distance / total calibrations involved
For 2- 10:
Line distance = 8
Total no. of cal = 16
Value of 1 line = 8/16 = 0.5
2.0,
49.

22. 6.5
1.) 2- 10,
Value of 1 line
= 8/16 = 0.5
5.56 4.55 3.54
7
3 2.5
7.5
8
8.5
9
9.5
10
49.

23. 3.) 10- 20,
Value of 1calibration = line distance / total calibrations involved
For 10- 20:
Line distance = 10
Total no. of cal = 10
Value of 1 line = 10/10 = 1
10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20
50.

24. 4.) 20- 50,
Value of 1calibration = line distance / total calibrations involved
For 20- 50:
Line distance = 30
Total no. of cal = 15
Value of 1 line = 30/15 = 2
20, 22,

25. 5.) 50- 100,
Value of 1calibration = line distance / total calibrations involved
For 50 - 100:
Line distance = 50
Total no. of cal = 10
Value of 1 line = 50/10 = 5
50, 55,

26. 6.) 100- 200,
Value of 1calibration = line distance / total calibrations involved
For 100 - 200:
Line distance = 100
Total no. of cal = 5
Value of 1 line = 100/5 = 20
100, 120,

27. 7.) 200- 300,
Value of 1calibration = line distance / total calibrations involved
For 200 - 300:
Line distance = 100
Total no. of cal = 2
Value of 1 line = 100/2 = 50
200, 250,

28. 8.) 300- 500,
Value of 1calibration = line distance / total calibrations involved
For 300 - 500:
Line distance = 200
Total no. of cal = 2
Value of 1 line = 200/2 = 100
300, 400,

29. 9.) 500- 1K,
Value of 1calibration = line distance / total calibrations involved
For 500 – 1K:
Line distance = 500
Total no. of cal = 1
Value of 1 line = 500/1 = 500
500, 1000,

30. 10.) 1K-2K,
Value of 1calibration = line distance / total calibrations involved
For 1K-2K:
Line distance = 1000
Total no. of cal = 1
Value of 1 line = 1000/1 = 1000
1000, 2000,

31. AREAS VALUE PER LINE
1. 0 – 2 ____________
2. 2 – 10 ____________
3. 10 – 20 ____________
4. 20 – 50 ____________
5. 50 – 100 ____________
6. 100 – 200 ____________
7. 200 – 300 ____________
8. 300 – 500 ____________
9. 500 - 1K ____________
10. 1K - 2K ____________
0.2Ω
1Ω
2Ω
5Ω
20Ω
50Ω
100Ω
500Ω
1KΩ
0.5Ω

32. 250Ω1.___
1.2KΩ2.___
650Ω3.___
460Ω4.___
24Ω5.___
15KΩ6.___
85Ω7.___
35KΩ8.___
20Ω9.___
8Ω10.__
Range Multiplier:
Instructions: Two items for each group
1.Identify the resistance
2.Compute using the assigned range
multiplier.

33. 250Ω1.___
1.2KΩ2.___
650Ω3.___
460Ω4.___
24Ω5.___
15KΩ6.___
85Ω7.___
35KΩ8.___
20Ω9.___
8Ω10.__

34. QUIZ
400Ω1.___ 140Ω2.___
65Ω3.___
400Ω4.___
220Ω5.___
100Ω6.___
700Ω7.___
400Ω8.___
250Ω9.___
1KΩ10.__
#1-#3 (X1), #4-#6 (X10), #7-#9 (X100) #10 (X1K)
Directions: Identify the pointer reading and compute. Write your answer in ¼ sheet of paper. (2 points
each reading.

35. Homework
Do a research work.
1.Technical Drawing in Electronics
2.Schematic and Pictorial Diagrams
3.Schematic Symbols