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Appendix F:
Effects of Resolution on Accuracy Statement
The AXD 550 MicroManometer has a resolution
of .01 inches H
2
O (1 Pa in metric units).
The accuracy statement reads ± (1% of indicated
r resolution). At very low differential
pressures, therefore, the accuracy approximates the
resolution.
e.g. differential pressure of .01 inches H
2
O
accuracy statement is ± (.01 x .01 + .01) or
±.0101 inches H
2
O or reading error is
±101% of reading.
As differential pressure increases, the resolution
effect is decreased. The graph below shows the
approximate error in % of reading you can expect
as differential pressure increases. (See
specifications for detailed specifications).
Error as a percentage of reading in inches of water due to meter resolution