Saturday 16 March 2013
READ OUTS OF DVMs
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In 3 / 4 digit numerator
indicates maximum value and denominator indicates number of digits
Number of digits
|
Maximum value
|
|
9/10
|
0,1,2,3………9
|
9
|
1/2
|
0,1
|
1
|
3/4
|
0,1,2,3
|
3
|
Note
A full digit has decimal
point but ½ , ¾ … doesn’t have decimal point
Example
( 0 – 1 )V 3 digit DVM
Sensitivity = resolution *
range = 10-3 * 1v =1mv
Roll over
Value
|
display
|
0.001v
|
.001
|
0.002v
|
.002
|
:
:
|
|
0.999v
|
.999 full scale reading
|
Total valid readings =
maximum value / minimum value
= 0.999/0.001
= 999
Total number of readings =
valid readings + reset
= 999
+ 1
= 1000
Similarly
range
|
sensitivity
|
Max value
|
( 0 – 10 )v
|
0.01
|
9.99v
|
( 0 – 100 )v
|
0.1
|
99.9v
|
3 ¾ digital read out
/display
Examples
A voltage of 0.1234V to be
displayed on 100V range of 4 ½ digit DVM
Solution
resolution = 1/ 10N = 1/104 = 10-4
resolution = 1/ 10N = 1/104 = 10-4
Only full digits have
decimal points and ½ digit has no decimal point
( 0 – 1 )V range
sensitivity = 10-4 *
1V =10-4V
0
|
.1
|
2
|
3
|
4
|
( 0 - 10)V range
sensitivity = 10-4 *
10V =10-3V
0
|
0
|
.1
|
2
|
3
|
( 0 – 100 )V range
sensitivity = 10-4 *
100V =10-2V
0
|
0
|
0
|
.1
|
2
|
( 0 – 1000 )V range
sensitivity = 10-4 *
1000V =10-1V
0
|
0
|
0
|
0
|
.1
|
2) A voltage of 0.6975V to
be displayed on 10V range of 4 ½ digit DVM
0. 697V
3) A voltage of 12.34V to be
displayed on 10V range of 4 ½ digit DVM
12.340V
1
|
2
|
.3
|
4
|
0
|
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