249/2001 Sb.
DECREE
The Ministry of industry and trade
of 22 March. June 2001,
laying down the requirements for the automatic inspection and sorting of the weighing
the device, called the EEC
Change: 260/2003 Coll.
The Ministry of industry and trade shall determine in accordance with section 27 of Act No. 506/1990
Coll. on metrology, as amended by Act No. 121/2000 Coll. (hereinafter the "Act")
for the implementation of § 6 (1). 2 and § 9 para. 1 of the Act:
§ 1
This Decree lays down the requirements for the automatic inspection and sorting
a weighing device. This Ordinance does not apply to automatic weighing
a device for calculating the price of the goods and the printing of documents about the price and the
grading eggs.
§ 2
Automatic control and sorting can be instead of weighing devices
official marks laid down special legal regulation ^ 1) marked
brand of the EEC pattern approval and EEC verification, the initial graphics
the form provides for a separate legal regulation, ^ 2) only if they meet the requirements
set out in the annex to this Decree, which has been verified by the procedures
laid down in the specific legislation. ^ 2)
§ 3
This Decree shall take effect on the date of publication of the sectoral annex for
the measuring instrument to the Protocol to the Europe Agreement establishing an association between the
The Czech Republic on the one hand, and the European communities and their
Member States, of the other part, on conformity assessment and acceptance of
industrial products in the collection of international treaties, or on the date of entry
the Treaty of accession of the Czech Republic to the European Union entered into force,
If the day earlier.
Minister:
doc. Ing. Gregr, r.
XIII.
Requirements for automatic weighing devices control and sorting
1. General definitions
Automatic control and sorting weighing devices divided
weighted goods into two or more groups according to
weight.
1.1 Check weighing machines
A weighing device that divides the weighted item whose
weight varies from predefined values
called a nominal weight.
Features control weighing machines is to divide the
weighted goods into two or more subgroups according to the
the value of the difference between his weight and the
nominal weight.
1.2 Sorting weighing devices
The device, which divides the goods of different weights,
for which there is no predefined
nominal weight.
Features of weighing machines for sorting by weight,
referred to as "screening scales", is to divide the weighted
goods into several subgroups, each of which is
characterised by the range of weight.
2. Terminology
2.1 classification according to the inspection or sorting
2.1.1 weighing devices separating pieces of weighted goods in
the various groups that are leaving the weighing device
separately.
2.1.2 weighing devices separating pieces of weighted goods so that
on each item can be another tag that indicates the
the group to which this piece belongs.
2.1.3 weighing machines that counted the pieces of weighted goods
in each group, without being divided.
2.1.4 the weighing device that for each piece of weighted goods
the Group issued an optical or acoustic signal,
without being divided.
2.2. Breakdown by method of the activity
2.2.1 Continuously operating control and sorting scales
Weighing devices with continuous movement of the weighted
product.
Movement of the product on the load receptor is
continuous and during this motion is available
information about weight.
2.2.2 Discontinuously working inspection and sorting scales
Weighing devices with discontinuous motion of the weighted
product.
Movement of the product on the load receptor is
information about the weight and is available
then, if the product still.
2.3. Devices that are part of the weighing scales
2.3.1 measuring system
2.3.1.1 the weighing unit
A device that provides information on weight, which is
has control or sort. This device may
partly or fully consist of non-automatic weighing instruments.
This device contains a medium load, balancing
mechanism and device showing the value of weight
the load, or the difference between that value and the reference
the value in the units of mass.
2.3.1.2 the boot device
A device that gives a command to the release of information about the
weight.
2.3.1.3. The device for data evaluation
A device that converts the data from the measuring units to the
the signal and the signal processing for the purpose of posting
inspection or sorting order.
2.3.1.4 the indicating device
A device that provides at least one of the
the following information:
-weight control or sorted load,
-the difference between the weight and the reference value,
-subgroup to which control or sorted load
It belongs to.
2.3.2. The transport facilities
Device for moving loads on the load carrier and of the
load carriers.
This device can be part of the weighing unit.
2.3.3 adjustment device
Device for the determination of the limits of the weight of the subgroups.
2.3.4 sorting equipment
The device that automatically splits the burden
to physically separate subgroups. This device
may not be part of a weighing device.
2.3.5 Correction device (set with feedback
binding)
The device, which, depending on the results of the weighing
automatically adjusts the filling device
mixer control weighing device.
2.3.6 Counter
Device showing the sum of the loads that are
move over load carrier (sum counter)
or the device showing the sum of the loads in each
the subgroup.
2.4 known as standard test load
Known as standard test load is the load, which is
tested known as standard zone of indecision (Us), under the conditions
specified in 7.2.1.1.
2.5. Metrological properties
2.5.1 the Nominal set point
Value, expressed in units of mass, preset
through the adjustment device for the purpose of
determination of the limit that separates consecutive
subgroup.
2.5.2 Real set point
Value, expressed in units of mass, due to the
which you can get for the same load two different
the decision, which have the same probability.
2.5.3 setting range
The extent to which the nominal set point can be set
the nominal value of the weight of the load.
2.5.4 the Interval setting (width of the subgroup)
Expressed in units of mass, the interval between
successive nominal set points.
2.5.5 setting error
The difference between the nominal value and the actual point
settings.
2.5.6 Category weight
The Sub-group which fall within the scope of the
weight. If the "n" points setting, then the entire
range of workloads, from zero to infinity, divided into
(n + 1) weight categories.
2.5.7 the minimum capacity
The value of the load under which the machine is not able to
to correctly identify and categorize the burden to the subgroup, in
they belong to.
2.5.8 Zone of indecision
The range is expressed in units of mass, in which the
machine decision unclear.
2.5.8.1 standard zone of indecision (Us)
The range announced by the manufacturer and expressed in units of
weight, in which weighing devices for
etalonovou test load and the speed of the activities
make two different decisions.
2.5.8.2 Nominal zone of indecision (Un)
The range announced by the manufacturer and expressed in units of
weight, in which weighing devices for the
the product and the speed to two different
decision.
2.5.8.3 the actual zone of indecision (Ua)
The range of detected by the Czech metrology institute or
the appropriate metrological service of the Member State and
expressed in units of mass, in which the machine can
for etalonovou test load or the product, and
speed to two different decisions.
Its conventional value is equal to 6 sigma (from-3 to
+ 3 sigma), where sigma is equal to the standard deviation.
2.5.9 surveillance or screening rate (speed)
Number of loads under the control of or classified under
the unit of time.
2.5.10 the length of load
Load length measured in the direction in which this burden
moves.
2.5.11 Time dear
The time elapsing between the moment when the whole load is
on the load receptor, and the moment when it is available
information about weight.
2.5.12 response time
The time elapsing between the moment when the whole load is
on the load receptor, and the moment in which the immediate
the response of the weighing unit is different from the final response of the
a value less than the Un.
Metrological characteristics
. PI 249-2001. pcx
3. General metrological requirements
3.1 the value of the scale interval of the weighing unit
If the weighing unit is indicating device
scale divided into units of weight, then
the value of the scale interval and the value of the verification scale interval
must meet the requirements of a particular legal
Regulation of ^ 3).
3.2 the maximum standard zone of indecision
Without prejudice to the requirements in section 5.1.2 must not
be a standard zone of indecision (Un) greater than:
-1 g for the nominal weight of the load to 100 g
including,
-1% for the load of a nominal weight over 100 g.
3.3. The relationship between the nominal and the standard zone
indecision
The nominal zone of indecision (Un) must not be less
than the standard zone of indecision (Us).
4. the maximum permissible errors
4.1. The maximum permissible errors for EEC type-approval
4.1.1 the weighing unit
If the weighing unit is indicating device
graduated in units of mass, then the
considered a non-automatic weighing devices and must
comply with the requirements in the static tests
established by special legislation ^ 3)
relate to the maximum permissible errors for the weighing
device.
4.1.2 the actual zone of indecision (Ua)
The actual zone of indecision as determined during the tests
carried out pursuant to point 5, shall not exceed 0, 8
standard zone of indecision (Us).
4.1.3 setting error
Error setting must not exceed 0 times
standard zone of indecision (Us).
4.1.4 Changing the actual set point with time
The change of the actual set point must not, during the period
operation of a duration of 8 hours must not exceed 0 times
standard zone of indecision (Us).
4.1.5 Change of the actual set point for the temperature
a difference of 5 ° C must not exceed 0, 1.5 times the standard zone
indecision (Us).
4.1.6 Impact of eccentric load
If it is possible to place the burden of eccentrically, then
the maximum difference between the values of weights needed
to obtain the equilibrium position when you load that is
equal to the minimum capacity shall not exceed
0 times the standard zone of indecision (Us),
whenever the load placed on a load carrier.
4.2. The maximum permissible errors for EEC initial verification
4.2.1. Weighing unit
If the weighing unit is indicating device
graduated in units of mass, then the
considered a non-automatic weighing devices and must
comply with the requirements in the static tests
special legal regulation ^ 3), concerning the
maximum permissible errors for the weighing
device.
4.2.2 the actual zone of indecision (Ua)
The actual zone of indecision as determined during the tests
carried out pursuant to point 5, shall not exceed 0, 8
the nominal value of the zone of indecision (Un).
4.2.3 setting error
Error setting must not exceed 0, 1.5 times the nominal
the zone of indecision (Un).
4.2.4 Changing the actual set point with time
The change of the actual set point must not, during the period
operation of a duration of 8 hours must not exceed 0 times
rated zone of indecision (Un).
4.2.5 actual set point Change with temperature
The change of the actual set point for the temperature
the difference of 5 ° C must not exceed 0.5 times the nominal zone
indecision (Un).
4.3 maximum permissible errors in service
4.3.1 the weighing unit
If the weighing unit is indicating device
scale divided into units of weight, then
considered a non-automatic weighing devices and must
comply with the requirements in the static tests
special legal regulation ^ 3), concerning the
maximum permissible errors for the weighing
device.
4.3.2 the actual zone of indecision (Ua)
The actual zone of indecision as determined during the tests
carried out pursuant to point 5, shall not exceed the nominal
the zone of indecision (Un).
4.3.3 setting error
Error setting must not exceed 0, 1.5 times the nominal
the zone of indecision (Un).
5. Conditions for the use of the maximum permissible errors
5.1 the normal conditions of use
5.1.1 Weight weighted products
Weight weighted products must be in the range between
the maximum and minimum capacities of the instrument.
5.1.2 Minimum capacity
The minimum capacity shall not be less than:
25 Un for Un = 200 mg <
50 to 200 mg < Un Un < = 500 mg,
100 Un for 500 mg < Un.
5.1.3 Time dear
Dear time must be greater than or equal to the response time and
less than or equal to the time during which a load is on
the load receptor. This requirement can be circumvented, if
It's the principles of operation of the equipment or
so allow.
For all the speed less than or equal to the maximum
the speed of the activities must setup error and region
indecision to remain less than or equal to the values
referred to in point 4.
5.2 factors
5.2.1 Temperature
The device must meet the requirements of section 4 in all
almost constant temperatures in the range of at least
25 degrees C.
If the device is intended for operation under the conditions
regulated temperature, then you can reduce the temperature range
at 10 degrees C.
The temperature is considered almost a constant, if
both of the following requirements are met:
-the difference between the extreme temperatures recorded during the
the test does not exceed 5 ° C,
-change the temperature does not exceed five minutes to 1 C.
5.2.2. Power supply
The real set point and the actual zone of indecision
(Ua) shall comply with the requirements of section 4 for the following
changes of the power supply:
from-15% to + 10% of nominal voltage and
from-2% to + 2% of the nominal frequency.
5.2.3 other influence factors
The weighing device must meet the requirements of paragraph 4,
When they are exposed to the effects of other influencing
factors other than those listed in points
5.2.1 and 5.2.2 and arising from the conditions of their
installation and intended use.
6. General technical requirements
6.1 operational competence
A weighing device shall be designed to
comply with the use for which they are intended.
6.2. A random incorrect Setup
A weighing device shall be so designed that, under the
normally it cannot be that bad
setting may violate their activity without
This influence was easily detectable.
6.3 Silencer oscillations (silencer)
Shock oscillation, whose characteristics are
affected by the change in temperature to such a degree that
operation and the accuracy of the machine are outside the prescribed limits,
must be fitted with an automatic compensation
device.
It must be indicated that the device works when
the correct temperature.
Oscillation damper must not be for unauthorized persons
easily accessible.
6.4 Conveyor
If the conveyor belts, streaks or contains chains,
to return the weighted products on the carrier
load, and if these strips, bars, or chains
they are fastened by means of a voltage regulation,
then if this voltage can affect the information on
the weight of the weighing unit, this device
they may not be easily accessible.
6.5 Balancing
6.5.1 the weighing device shall be maintained in the reference
(reclined) position.
6.5.2 If the weighing devices are portable, must then be
equipped with compensatory equipment and location
indicator or, in the case of tilt in the longitudinal
or příčeném direction by 5% meet the requirements
in point 4.
6.5.3. Where the position indicator is supplied for the purpose of
achieve compliance with section 6.5.2, there must be sensitivity
position indicator, such that its moving
part of the indicator is pointing when you tilt the 0.5% displacement
at least 2 mm.
6.6 the equilibrium position setting device and
adjustment device
The device controls for setting up the equilibrium
position and the adjustment device must be able to
set up at least one-fourth of the nominal
the zone of indecision, regardless of whether it is a weighing
the device is loaded or not, in accordance with its operating
method.
6.7 Removable weight
Removable weight must be either the weights of the medium
or a higher class of accuracy according to the relevant
requirements of special legal regulation ^ 3) or
specially made distinguishable by weight
the shape of these weights and identifiable with the
device.
4.2 Descriptive designation
6.8.1 Mandatory labelling
The weighing device must bear the following markings:
-identification mark of the manufacturer,
-identification mark of the importer,
-serial number and type designation of the device,
-EEC type-approval mark,
-maximum capacity: max......................
-minimum capacity: min......................
-the nominal zone
indecision Un.......................
-speed: ... ... ... .... the number of loads
per minute
-response time: t......................
-the value of the verification scale interval of the weighing unit
According to the requirements of a specific legislation ^ 3)
-limits of temperature: ... st. C/..........st. (C)
-voltage electrical
zdroje: ........................ In
-the frequency of the electrical
zdroje: ....................... Hz
-identification mark on parts of the device that
they are not directly connected to the main unit.
6.8.2 Additional marking
According to a particular use of a weighing device may
Czech metrology institute or the relevant
the metrological service of the Member State issuing the
EEC type-approval certificate, require one or
more supplementary designations.
6.8.3 Location friendly designation
The descriptive markings shall be indelible and must have
the size, shape and clarity, in order for
normal conditions of use a weighing device
allow for easy reading.
This marking must be grouped on the scales to easily
prominent place, either on the label with a nominal
affixed next to the values of the indicating device, or
on the indicating device.
A label bearing such an indication shall be
seal, so it cannot be without damage
delete.
6.8.4 the verification marks
Descriptive label can contain a face
for the verification marks. If this label has
Instead, then the device designed for this
the purpose must be available in its vicinity.
7. Eec type-approval
EEC type-approval of automatic control and
sorting weighing machines must be carried out according to the
special legal regulation ^ 2), and the supplementary
and refined requirements.
7.1. Application for EEC type-approval
The request must be accompanied by a weighing device
of the appropriate type, and the following documents:
7.1.1 Documents establishing metrological characteristics:
-the special characteristics of the weighing unit,
-maximum speed activities in accordance with the speed
conveyor with a length of load, load
-electrical properties of the components of the measuring system.
7.1.2. Descriptive documents:
-General arrangement drawings
-the photos and, if necessary, drawings or models
details the importance of metrology,
-schematic drawings showing the method of the activity and
technical description of the instrument.
7.2 examination for EEC type-approval
7.2.1. Eec type-approval tests
The device shall meet the metrological requirements
referred to in points 3, 4.1 and 5 in relation to a standard
the zone of indecision (Us) for standard test
Load Balancing in the scope of their activities, IE. between the minimum
and the maximum capacity, and the minimum and maximum
speed.
Weighing devices, which may have several nominal
points set, shall be tested for at least two
the nominal set points.
Known as standard test burden.
If the test is carried out for the EEC type-approval,
then they have to use known as standard test burden.
Known as standard test load must meet the following
terms and conditions:
-mass "m" = max, min, and 1/2 (max + min.)
-length "L" (cm) = third odm. from m (g) +/-20%
L
-height "h" =-
2
-constant weight,
-hard material,
-nehygroskopický material
-neelektrostatický material
-to avoid metal-to-metal contact.
7.2.1.1. Static tests
7.2.1.1.1 tests with eccentric load
If it is possible to place a load on the load carrier
eccentrically, then you must perform the test loads,
that is equal to the minimum capacity and which is
placed successively at each point of load carriers.
The maximum permissible errors are specified in section 4.1.6.
7.2.1.1.2 Special tests for devices with a weighing unit,
that consists of a stand-alone's
a weighing device.
The weighing unit, a weighing device shall be subjected to
the tests of sensitivity, accuracy, mobility and
are listed in the specific legal requirements
prescription ^ 3).
The maximum permissible errors shall be the same as errors
for non-automatic weighing devices in accordance with
the value of the verification scale interval and class
precision.
7.2.1.2 response time measurement
The response time must be measured at constant test
conditions without the influences of inappropriate influence factors.
The values obtained must not be greater than the values specified
in the descriptive markings.
The data referred to in point 7.1.1 on the maximum
operating speed as a function of the speed of the conveyor
and the length of the load must correspond to the values obtained
for response time.
7.2.1.3 tests under normal conditions of use
7.2.1.3.1 Zone of indecision and error settings
The test must be carried out according to method (C), as
described in section 10.3.
7.2.1.3.2 the actual set point Change with time
These tests must be carried out with the etalonovými
the test loads without changing the settings of the instrument and without
changes affecting factors and must be repeated
several times during the eight-hour operation. During these
the tests can be used to obtain the results
electrical measurement method.
7.2.1.3.3 Change the actual temperature set point
These tests must be carried out with the etalonovými
the test loads without changing the settings of the weighing
the device, and without changing the influence factors with
the exception of temperature; These tests must be in the temperature
the scope specified by the manufacturer, repeated several times. During
These tests can be used to obtain
the results of electrical measurement method.
7.2.2. Test of compliance with technical requirements
Of these tests must be able to determine whether the scales
meet the technical requirements referred to in point 3.
7.2.3. The provisions on the means of testing
For the purposes of testing may Czech metrology Institute
or the appropriate metrological service of the Member State,
require from the applicant a standard test load,
handling equipment, trained staff and suitable
the necessary control of the weighing device.
7.2.4 testing Place
Weighing devices submitted for approval
may be tested:
-either at the premises of the Czech metrological Institute
or the competent authority of the Member of the metrological
the State to which the request was submitted, or
-on any appropriate place designated by agreement between the
Czech metrology institute or the relevant
the metrological service of the Member State and the applicant.
8. The initial EEC verification
The initial EEC verification of automatic control and
sorting weighing machines must be carried out according to the
special legal regulation ^ 2), and the supplementary
and refined requirements.
8.1 Tests for the initial EEC verification
The weighing device must for a given product or products
comply with the requirements referred to in points 3, 4, 5 and 6 in
relation to the decisions of the (Un) in the scope of activities,
i.e.. between the minimum and the maximum capacity, and the minimum
and a maximum speed of.
The initial EEC verification is performed by Czech metrology
Institute for metrological service of the Member or the appropriate
the State, in one or in two stages.
8.1.1. Testing of the first phase
The static test shall be carried out according to paragraph 7.2.1.1.
8.1.2 Testing the second stage
Zone of indecision and error settings must verify
for products for which the weighing device is intended,
by using one of the methods described in point 10.
Method (C) in the case of dispute, the reference method.
8.2. The provisions on the means of testing
For the purposes of testing may Czech metrology Institute
or the appropriate metrological service of the Member State from
the applicant requesting a standard test load,
handling equipment, trained staff and suitable
the necessary control of the weighing device.
8.3 Place the initial EEC verification
The first stage can be carried out in the workshop or on another
a suitable place agreed with the Czech metrology
the Institute or the relevant metrological service
of a Member State; the second stage shall be carried out on
the place of installation.
If the initial EEC verification is completed in the first
stage, then this must be done at the place of installation.
9. Test operation
5.7 test operation
If you have carried out tests during operation, then
It uses the point 4.3.
10. Test method
10.1 the increment Method (method A)
10.1.1 Procedure
10.1.1.1 used test load which is equal to the desired
load.
10.1.1.2 Set set point that is to be tested,
during the "n" Dear always signal
"rejected".
If the weighing devices one or two points
settings, and if you set the interval weighing
a small device, then the point or points of the settings that
are not used, you must set up quite clearly on point
settings, which is being tested, in order to avoid possible
interference during the test.
We will increase the burden on the increment of 10.1.1.3 equal approximately one
tenth of the nominal zone of indecision (Un), as
shown in the weighing device and the test
burden, let go through the "n" times a device.
10.1.1.4 Continue the test so that we increase the test
the burden of individual increments, until during the
the "n" does not appear once the signal "accepted".
10.1.1.5 Continue the test so that we increase the test
the burden of individual increments, until during the
"n" Dear always appears to signal the "accepted".
10.1.1.6 Continue for several increments of weight after that point.
assemble the Results into a table 10.1.1.7.
10.1.1.8 Repeat test procedure with the same test
loads so that we will reduce the burden on the individual
additions, or that we will use a random load.
If it's a random process, then for each
the increment will be needed the test burden.
10.1.1.9 Results put together into the table.
10.1.2 Calculations
10.1.2.1 From the results obtained, we calculate the percentage
the number of refusals and the number of adoption.
10.1.2.2 The layout diagram of the probability in arithmetic
the network, to plot the relationship between load and increases
the percentage of refusals.
10.1.2.3 from straight lines, which we should get, we choose a suitable
on either side of the interval point 50% (values
intervals 2.275%-50% and 50%-97.725% correspond to the
2 sigma).
10.1.2.4 Subtract weight interval corresponding to these
points.
10.1.2.5 Interval weight divided by two gives the value of the
Sigma.
10.1.2.6 now you can estimate the conventional value of the zone
indecision (6 sigma).
10.1.2.7 Value in point 50% (midpoint zone indecision)
the value is the actual set point.
10.1.2.8 setting error is the difference between the nominal point
settings and observed value of the actual point
settings.
10.2 the up and down Method (method B)
10.2.1 how to
10.2.1.1 if we select the test burden. Its value should be
less than the value of the set point for approximately
five times the nominal zone of indecision (Un).
10.2.1.2 Chooses the increment value of the base load "d". This
the value should be of the order of Un/4, where Un is the rated
zone of indecision is mentioned on the label, with nominal
the values of the weighing device. (This burden should
have an appropriate value, which would allow to use
known as standard weights and to simplify the calculation, for example.
10, 20, 50, 100, 200, 500.)
10.2.1.3 Test burden shall then pass the weigh
the device back and forth until the weight gradually between
individual passes will increase in an appropriate manner so that
test load plus the added burden, with a total
weight Mo, falls within the scope of the zone of indecision,
the selected set-point. A weighing device is now
ready to record the results.
10.2.1.4 Testing continues as follows:
The burden Can pass the inspection weights.
If you can see the signal "rejected", then the second
test procedure with Mo + d; If
but you will see the signal "accepted", while the second test
pass the burden of Mo-d.
This method of testing by adding or subtracting
"(d)" depending on the outcome of the inspection weighing operations
until it reaches the required number of passes.
10.2.1.5 results obtained shall be recorded in the test
the table reproduced in point-shaped 10.2.3.
Each horizontal row in the table corresponds to a particular
the value of the load Mo +/-id, the total number of rows
It covers the width of the zone of indecision. The results of each
the passage of the type in the table in the form of a code;
We recommend that you use for load rejection
"X" and "O" for adoption.
10.2.2 Calculations
10.2.2.1 Zone of indecision about X I
-----------
MO-2d X 0 1 2
MO-d O X X 1 2-1
Mo O O X X 2 2 00
MO + d X X X 1 3 + 1
MO + 2d O O O 3 0 + 2
-----------
7 8
-----------
No Nx
The brand "X" and "O" on each line, Mo +/-id
summed up: the number of "Nx" brand "X" and the number of "No" brands
The "O" in the same way sums for all rows.
When you perform calculations with it's file with the numerically
a smaller sum, either the results or results of X,
because each of the results file gives approximately
the same statistical information.
Zone of indecision is calculated using the
the following formula:
NB-A ^ 2
UA = 9, 72d (--------------) + 0.029
N ^ 2
where:
d = load of the step increment (Un/4, see section
10.2.1.2)
I = number of load increments
NI = number of results used in the line i
N = total number of results (Well, or Nx,
which one is larger),
A = sum i.ni,
(B) = sum (i) ^ 2.
10.2.2.2 Point settings (see section 2.5.2)
Set point is calculated using the following
relationship:
And 1
m = Mo + d (--- +/- ---)
N 2
The plus sign must be used when calculating
It is based on a rejection of (X), and the minus sign has
It's when the calculation is based on from the adoption of (a).
The setting error, then gets the difference between the
the real point of the set m (gained above
the calculation) and a nominal set-point.
3 the standard deviation computed values
10.2.2.3.1 Zone of indecision (Ua)
The standard deviation of the variable Ua (in accordance with point
10.2.2.1) can be estimated from the relation:
Hua
Sua = ----------
ODM. from N
The value of the coefficient (H) varies depending on the ratio of
(d)
-According to the table set out in point 10.2.2.3.1.1.
UA
A mathematical method for calculating the zone of indecision is
valid only for:
(d) 1
---
