L
Lorna
Hello
I’m trying to understand the accuracy of a PAT tester which states the resolution, % and digit tolerances of individual test types.
My calculations are below for a hypothetical test and I would be very grateful if anyone could tell me if I’m doing right.
Resolution = 0.01 (2dp)
Accuracy = ±5% ±2 digits
Test Reading = 15.50
Step 1:
Determine the % tolerance
15.50 * 0.05 = 0.775
Step 2:
Round to 2dp = 0.78
Step 3:
Add the digit accuracy to least significant figure
= 0.78 + 0.02
=0.8
Therefore for a reading of 15.50
± 0.8 (5.16% of 15.50)
Upper limit = 16.30
Lower limit = 14.70
Thanks for your time
Lorna
I’m trying to understand the accuracy of a PAT tester which states the resolution, % and digit tolerances of individual test types.
My calculations are below for a hypothetical test and I would be very grateful if anyone could tell me if I’m doing right.
Resolution = 0.01 (2dp)
Accuracy = ±5% ±2 digits
Test Reading = 15.50
Step 1:
Determine the % tolerance
15.50 * 0.05 = 0.775
Step 2:
Round to 2dp = 0.78
Step 3:
Add the digit accuracy to least significant figure
= 0.78 + 0.02
=0.8
Therefore for a reading of 15.50
± 0.8 (5.16% of 15.50)
Upper limit = 16.30
Lower limit = 14.70
Thanks for your time
Lorna