Six main technical parameters of scanning equipment

- Nov 04, 2019-

Bar code scanners are widely used in the retail industry, manufacturing, logistics, healthcare, warehousing, and even security.Before choosing a bar code scanner, understand the six main technical parameters of the scanner: resolution, scan depth of field, scan width, scan speed, primary identification rate, and bit error rate.Then according to the requirements of the application, the appropriate bar code scanner equipment is selected against these parameters


1. What is resolution

For bar code scanner, resolution is the narrowest bar code symbol width, English is MINIMAL BAR WIDTH, abbreviated MBW, unit is mil.

Generally, the resolution of scanning gun is 5mil, 4mil and 3mil. The higher the resolution, the higher the price.When selecting the bar code scanning gun, the higher the braid rate of the scanning gun, the better.In use, if the resolution of the selected scanning gun is too high, the smudge and deinking on the symbol will also affect the successful scanning of the scanning gun.


2.What is scan depth of field?

Scanning depth of field refers to the difference between the maximum distance that the scanning gun allows to leave the surface of the barcode label and the nearest distance that the scanning gun can approach the surface of the barcode label under the condition of correctly scanning the barcode, which is the effective working range of the barcode scanning gun.Some bar code scanning gun does not give the scanning depth of field parameter in the technical index, but gives the scanning distance, that is, the farthest and shortest distance from the scanning gun to the surface of the bar code label


3.What is scan width

Scan width refers to the physical length of barcode information that can be read by scanning beam at a given scan distance.


4.What is scan speed

Scanning speed refers to the scanning frequency of scanning beam on the scanning track in unit time


5.What is the first recognition rate

The one-time recognition rate represents the ratio of the number of bar codes successfully scanned for the first time to the total number of bar codes scanned.For example, if information about a bar code needs to be scanned twice for every successful scan, the recognition rate is 50%.From a practical point of view, of course, we hope that each scan will be successful, but unfortunately, due to the influence of many factors, it is impossible to require a recognition rate of 100%.

It should be noted that the one-time recognition rate is only applicable to the handheld light pen scanning recognition method.With laser scanning, the beam can scan the bar code tag hundreds of times per second, and the signal is repeated


6. What is bit error rate

Bit error rate (ber) is a very important test index to reflect the misidentification of barcode by scanning gun.Bit error rate is the ratio of the number of false identification to the total number of identification.For a bar code scanner, bit error rate is more important than "one time recognition rate".

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