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PELAKSANAAN CEK ANTARA STANDAR UKURAN LABORATORIUM MASSA DI BSML REGIONAL II
Disampaikan oleh Arif Nurjaya, ST
Bimbingan Teknis Pengelolaan Laboratorium Dan Standar Ukuran Di Bidang Metrologi Legal
Hotel Grand Zuri Malioboro Yogyakarta
The Ministry of Trade of the Republic of Indonesia
Check standard is a standard that is used as part of
measurement assurance program to provide check on the
standard and process to ensure that the standards,
measurement results, and measurement processes are
within acceptable statistical limits.
–KAN G-06 Guide On Measurement Assurance
E 2 F 1 Artifact
CHECK STANDARD
Calibration
?
Check standard
The Ministry of Trade of the Republic of Indonesia
The concept of statistical process control is based on
comparing how measurement process is performing today
(often a single measurement) to how it has performed in
the best (a database of measurement results).
–KAN G-06 Guide On Measurement Assurance
The Ministry of Trade of the Republic of Indonesia
STATISTICAL PROCESS CONTROL
Today The Best
5
(initial data)
123.00O
N
O
FF
AT Standar
AT Dikalibrasi 2010321
A B B A
1 DATA =
A B B A
A B B A
A B B A
Massa
Konv.
1 SERI
The Ministry of Trade of the Republic of Indonesia
Control chart is a graphical tool used to visualize data
when monitoring, evaluating and improving a
measurement process
–KAN G-06 Guide On Measurement Assurance
The Ministry of Trade of the Republic of Indonesia
CONTROL CHART
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Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7
Data 8
Data 9
Data 10
10 is good number of data points to use as the baseline for our
initial control measurements. Be sure to gather data over a period
of time, with not more than 1 measurement from the same day.
MEAN
DEVIATION
Statistical Warning Limits
Statistical Action Limits
UWL
LWL
= mean + (2 x deviation)
= mean - (2 x deviation)
Upper
Lower
UAL
LAL
= mean + (3 x deviation)
= mean - (3 x deviation)
Upper
Lower
The Best(initial data)
The Ministry of Trade of the Republic of Indonesia
CHECK STANDARD
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Description : 3 point control chart
Balance used : XP26C / 0.001 mg
Load : 0.002 g
Unit : g
Check Standar : F1 OIML class
Serial Number : 15885
Date Data Correction Mean Std DevLIMIT
UWL LWL UAL LAL
4-Feb-13 0.0020017 0.0017
0.00005 0.0010
0.0021 -0.0020 0.0031 -0.0030
5-Feb-13 0.0020007 0.0007
6-Feb-13 0.0020002 0.0002
7-Feb-13 0.0020012 0.0012
8-Feb-13 0.0019987 -0.0013
9-Feb-13 0.0019997 -0.0003
10-Feb-13 0.0019987 -0.0013
11-Feb-13 0.0020007 0.0007
12-Feb-13 0.0019992 -0.0008
13-Feb-13 0.0019997 -0.0003
7-Jul-13 0.0020035 0.0035
0.00157 0.00258-Jul-13 0.0020025 0.0025
9-Jul-13 0.0019987 -0.0013
The Ministry of Trade of the Republic of Indonesia
CHECK STANDARD
10
Description : 3 point control chart
Balance used : XP26C / 0.001 mg
Load : 0.002 g
Unit : g
Check Standar : F1 OIML class
Serial Number : 15885
Ma
ss
Co
rre
cti
on
(m
g)
Control Chart
0,004
0,003
0,002
0,001
0,000
-0,001
-0,002
-0,003
-0,004
4-13 Feb 2013 Date 7-9 Juli 2013
UWL
LWL
UAL
LWL
The Ministry of Trade of the Republic of Indonesia
Out of Control? What next???
− Recalibration of the standard
− Validate calculation software
− Validate check standard calculation
− Obtain service or repair for balance
− Get new staff trained as soon as possible
− Fix environmental control as soon as possible
The Ministry of Trade of the Republic of Indonesia
STATISTICAL EVALUATION
Today The Best
Deviation
Mean
Deviation
Mean
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t - test
F - test
(initial data)
The Ministry of Trade of the Republic of Indonesia
F – test
F – test is used to evaluate two processes have equivalent standard
deviations
𝐹𝑣𝑎𝑙𝑢𝑒 =𝑠𝑜𝑙𝑑2
𝑠𝑛𝑒𝑤2
Our measurement system is considered to be “out of control” if we meet the
following conditions:
𝐹𝑣𝑎𝑙𝑢𝑒 > 𝐹∝,𝑣𝑛𝑒𝑤 ,𝑣𝑜𝑙𝑑 ; if 𝑠𝑜𝑙𝑑2 >𝑠𝑛𝑒𝑤
2
𝐹𝑣𝑎𝑙𝑢𝑒 < 𝐹1−∝,𝑣𝑛𝑒𝑤,𝑣𝑜𝑙𝑑 ; if 𝑠𝑜𝑙𝑑2 <𝑠𝑛𝑒𝑤
2
Possible action steps:
− Obtain service or repair for balance
− Get new staff trained as soon as possible
− Fix environmental control as soon as possible
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The Ministry of Trade of the Republic of Indonesia
F – test
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OIML R111-1:2004 Annex D
The Ministry of Trade of the Republic of Indonesia
t - test
t – test is used to evaluate the means of two processes
𝑡𝑣𝑎𝑙𝑢𝑒 =𝑥𝑜𝑙𝑑 − 𝑥𝑛𝑒𝑤
𝑠𝑜𝑙𝑑2
𝑛𝑜𝑙𝑑+𝑠𝑛𝑒𝑤2
𝑛𝑛𝑒𝑤
Our measurement system is considered to be “out of control” if we meet the
collowing conditions:
𝑡𝑣𝑎𝑙𝑢𝑒 < 𝑡𝑐𝑟𝑖𝑡𝑖𝑐𝑎𝑙 ; 𝑣 =
𝑠𝑜𝑙𝑑2
𝑛𝑜𝑙𝑑+𝑠𝑛𝑒𝑤2
𝑛𝑛𝑒𝑤
2
𝑠𝑜𝑙𝑑2
𝑛𝑜𝑙𝑑
𝑛𝑜𝑙𝑑−1+
𝑠𝑛𝑒𝑤2
𝑛𝑛𝑒𝑤
𝑛𝑛𝑒𝑤−1
Possible action steps:
− Recalibration or get maintenance of the standard
− Validate calculation software
− Validate check standard calculation
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The Ministry of Trade of the Republic of Indonesia
t - test
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OIML R111-1:2004 Annex D
The Ministry of Trade of the Republic of Indonesia
ANALYZE DATA
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Control Chart
• Process degradation
• Process improvement
• Process compared to specification / tolerances
• Shift in values of standard
• Drift of values of standard
• Outliers
• Possible assignable causes
• Possible action steps
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PROCESS IMPROVEMENTWe obtained service for your balance
We have a new calibration officer who has many years of previous experience
Our environmental controls were repaired or improved
We have been practicing in balance operation
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SHIFT IN VALUES OF STANDARDOur standard is damage
Our check standard is damage
We are using calculation software
that has not been validated
We have errors in entering data
Our equation for the correction due to environmental
condition were drifted and correction changed
Our standard was recalibrated and a new value was
assigned without starting a new control chart
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DRIFT OF VALUES OF STANDARD
Our working standard worn from use
Our check standard getting dirty
Our standards are not stable enough for this process
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OUTLIERSBalance not exercised normally / properly
We do not allow adequate thermal equilibrium to the standard prior to begin calibration
We have data entry error or miscalculation
Our environmental system is out of control
Our standard was recently damaged
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PROCESS DEGRADATIONOur balance need service
We have calibration officer in the laboratory who needs training
Our environmental controls stopped working properly
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PROCESS COMPARED TO SPECIFICATION / TOLERANCES
Our process is not achieving the requirements needed to meet the tolerances
because our balances has degraded and can not reach its normal performance
The Ministry of Trade of the Republic of Indonesia
LaboratoriumVolume
LaboratoriumSuhu
LaboratoriumGaya danTekanan
LaboratoriumMassa
LaboratoriumPanjang
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a r i f . n u r j a y a @ k e m e n d a g . g o . i d
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