In terms of accuracy, the "flash point method" is mainly used to calculate the error.

1
Extended display device application
For a digital indicator, if there is a display subdivision
The display device of the indicating value (not greater than 0.2e) can be more convenient to determine
The error of each calibration scale value is determined more accurately than that of the "flicker point method"
The calibration efficiency is improved by the error of weighing value. Just follow R76
If the device is used in the verification, it should be noted in the test report
Clear ".
1.1
Routine application
(1) According to manual instructions, the number indicates the actual fraction of the weighing device
A device whose degree value (d) is temporarily converted to less than the certified degree value (e).
(2) If the digital indicator is equipped with an extended display device,
one
The conditions under which an indication less than the verified index value (e) can be displayed are:
-- Hold down the function during;
-- within 5s after giving a manual command.
(3) When the extended display device is in operation, no matter what
Unable to print.
1.2
Application taboo
(1) Digital indicator scales sold directly to the public shall not be equipped
Extended display device.
(2) It is not allowed to be used on digital indicator scales with differential scales
Yes.
(3) This device should be used in the verification report
Indicate.
R76 in 4.13.7 provides that "weighing instruments sold directly to the public are not
Auxiliary indicating devices and extended indicating devices shall be provided.
Set literally, as if to protect the interests of consumers, but limited
The use of the "extended indicating device" in public weighing instruments is determined.
And in T.2.6 it is stated that the "extension indicating device" is done manually
Under the command, the actual index value of the scale is temporarily converted to less than the test
A device for indexing values, that is, during normal weighing operations,
The "extended indicator" does not change the display during weighing.
It will not affect the fairness of trade. Because it says in A.4.1.6
Very clear, for this display subdivision values (not greater than 0.2e)
If the indicating device is used in the test, it should be noted in the test report
Understand. This clearly tells us that this device is only subject to verification
It is used when issuing manual instructions and does not affect the weighing result
It's positive.
The current phenomenon used to cheat in the trade process is through operation
Make some special buttons to change this weighing slope (or change part of the scale)
Quantity value), this cheat method is enabled with "extended display device"
The purpose of use and the method of operation are quite different. So it's not necessary
Limited to use in public sales, that is, in electronic pricing scales, etc
Weighing instruments used for public sale may be equipped with such devices for easy use
Quickly complete performance tests during verification.
2
2.1
It is suggested to promote the scope of application
The role of manufacturing enterprises
For manufacturing enterprises, the weighing instrument in the digital indication weighing instrument
It is very simple to add such a device to the table and the electronic pricing scale
One thing. One is to add a relevant program text to the software
The second is to select a set of keys on the keyboard as an extended display device
Private key.
2.2
The role of metrological technical institutions
2.2.1 Many technical institutions are now complaining about digital indicators
The measurement performance of the meter needs to detect many items, and the time consumed by the verification
Relatively long, it is difficult to complete the task in the assigned area within a limited time
Yes. Because, the current use of digital indicator weighing products are not available
Clearly can be configured "extended display device", verification in order to obtain
Close to the actual indication value of the detected load, the "flicker point" is generally used at present
Add (or reduce) additional weights one by one until the number indicates
The indicator value of the scale is significantly increased (or decreased) by a index value, and then corrected
The additional load ΔL is calculated according to the formula given, so as to obtain the integral front
Correction error.
2.2.2
It is because of the use of the "flicker point method" operation process
Miscellaneous and long time, should actively promote the "extended display device" in the number
The word indicates the application on the weighing device and urges the manufacturing enterprise to design and install this
Device.
2.2.3
In the preparation of JJG539-2016 "digital indicating scale" verification
Procedure, is to promote the application of "extended display device", in
This term was added to the specification to advance this knowledge
Yes.
3
3.1
Conclusion
About the translation of "indication" and "display"
There is a requirement for "expansion devices" in R76 International recommendations
The problem to be considered is the use of different nouns for the same term
The word formulation, while both are feasible from a literal point of view, is expanded in "T.2.6.
extended displaying device ", while in "4.4.3
extended indicating devices ". In fact
There are many similar problems in the text of R76 International recommendation, for example
For example, "T.2.2.2 Weighing indicator", with "T.2.2.6
digital display ", 4.13.7 auxiliary indicator installation
Auxiliary and extended indicating devices
devices) and so on. But in order to achieve consistency throughout the article, also
It is recommended to use the same words as much as possible.
To be able to illustrate these issues, the "extensions" used in this article
The terms "display device" and "extended indicating device" are both R76 International
Suggest the representation in the original text.
3.2
Questions about how to use actual indexing values
With the widespread application of digital technology and the great degree of circuit integration
The stability of the digital indicator weighing instrument is also greatly improved
2
High. The actual index value of a digital indicator is refined to verification
A tenth or even a hundredth of the index value is very easy
MHM. The temperature change amplitude is small and the electromagnetic interference effect is relatively small
In the environment, many class III "electronic balances" are now graded
Thirty thousand and sixty thousand, for the digital indication of no "extended display device"
Whether it is allowed to expand the calibration index value during the verification of the device product
Ten times, using the direct reading method to accurately determine the load indication value.
In R76 International Recommendation T.2.8.4, device-specific parameters include calibration
Quasi-parameters (such as maximum weight, minimum weight, index value, unit of measurement)
These parameters are only available under the specific operation mode of the weighing device
Make adjustments or selections to it. So this method is just checking
When used, the score of the status must be displayed after the verification work is finished
The degree value is adjusted back to the certified index value, and the weighing device is sealed. this
The sample can not only improve the working efficiency, but also does not violate the Ⅲ class electronic weighing instrument verification
The index value must be specified as e =d. But if this question can
It is allowed to be used in daily verification and needs to be carried out through certain procedures
Legislation, otherwise the corresponding results cannot be recorded at the time of verification.