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AZI Customer Service 800-528-7411 or 602-470-1414 Page 71 of 92
8.2. The Precision Weight Test
The precision weight test consists of performing the weight test in Section 8.1 multiple
times to determine the instruments repeatability. This is a more critical verification of the
instrument’s performance.
Mean, Standard Deviation, and Relative Standard Deviation are calculated using the
following formulas.
Mean = total of results divided by number of results.
Standard Deviation =
1-n
x-x
2
)(
Relative Standard Deviation expressed as percentage = Standard Deviation
divided by Mean, multiplied by 100
Perform the steps in the weight
test a total of five (5) times.
After all five tests are complete,
press [MENU] and select the
STORED DATA MENU.
PRESS [ENT] to select tests.
Arrow up or down to select the
five weight tests and press
[ANALYZE].
The mean of the results should
be 37.500%, +/-.020 for a test
using the five and three gram
weights.
If the results obtained from these
tests are outside the specified
range, call AZI Customer Service
at 800-528-7411 or 602-470-1414
for assistance.