Repeatability Test - A&D BM series Instruction Manual

Repeatability Test

6.7.
Repeatability is an index of variation when measuring the same mass repeatedly.
Standard deviation is generally used for the indicator of repeatability.
The repeatability test measures the internal mass 10 times and displays the standard deviation.
Use the repeatability test function to inspect the performance of the balance when changing the
environment or when moving the balance to a new location.
Example: "Standard deviation = 0.2 mg" means that a probability of weighing errors being within
±0.2 mg is approx. 68% when measuring the same mass repeatedly.
Notes
When the password function is used, the repeatability test function is available only when
logged in as an administrator (
The repeatability test uses the internal mass. Therefore, the obtained standard deviation
may disagree with that of the repeatability of "20. Specifications". Regard the standard
deviation as a reference.
BM-20, BM-22
BM-252, BM-500, BM-300, BM-200
1 Press and hold the
until
rep te5t
the key.
2 When
rep te5t
is automatically started,
measurement count (0 to 10) is displayed.
To cancel the current measurement,
press the key.
CAL
Note Avoid vibration and breezes for
precise measurement during this test.
3 At the end of the measurement,
the standard deviation of the
repeatability is displayed.
4 Press the
CAL
to return to the weighing mode.
BM series
Model
key (for approx. 4 seconds)
RANGE
is displayed, and then release
is displayed, the measurement
blinks and the
" r " e " p
key or key
PRINT
).
Internal mass
Approx. 20 g
Approx. 190 g
Example of BM-20
Weighing mode
In measurement
Result
Standard deviation
Weighing mode
33
Press and hold
(approx. 4 seconds)
Release
Counter
Cancel
or