Cek Antara Standar Ukuran Laboratorium Massa

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 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).



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


Control chart is a graphical tool used to visualize data

when monitoring, evaluating and improving a

measurement process



CONTROL CHART

8

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)


CHECK STANDARD

9

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


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


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


STATISTICAL EVALUATION

Today The Best

Deviation

Mean

Deviation

Mean

12

t - test

F - test

(initial data)


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

13


F – test

14

OIML R111-1:2004 Annex D


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

15


t - test

16

OIML R111-1:2004 Annex D


ANALYZE DATA

17

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

18

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

19

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

20

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

21

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

22

PROCESS DEGRADATIONOur balance need service

We have calibration officer in the laboratory who needs training

Our environmental controls stopped working properly

23

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


LaboratoriumVolume

LaboratoriumSuhu

LaboratoriumGaya danTekanan

LaboratoriumMassa

LaboratoriumPanjang

24

a r i f . n u r j a y a @ k e m e n d a g . g o . i d

25

Cek Antara Standar Ukuran Laboratorium Massa

Technology

Transcript of Cek Antara Standar Ukuran Laboratorium Massa