Key parameters of barcode scanner

- May 19, 2020-

Before selecting barcode scanner, it is necessary to understand several main technical parameters of barcode scanning equipment, and then select the appropriate equipment according to the application requirements according to these parameters.

1) resolution

For bar-code scanning systems, the resolution is MINIMAL BAR WIDTH(MBW) that can be read correctly. When selecting a device, it is not the higher the braid rate of the device, but the scanner with the corresponding resolution should be selected according to the bar code density used in the specific application. In use, if the resolution of the selected device is too high, then the blot on the bar, deinking and other effects on the system will be more serious.

2) scanning depth of field

Scanning depth of field refers to the difference between the maximum distance that the scanning head is allowed to leave the barcode surface and the closest point that the barcode scanner can approach the barcode surface under the premise of ensuring reliable reading, that is, the effective working range of the barcode scanner. Some barcode scanning equipment does not give the scanning depth of field index in the technical index, but gives the scanning distance, that is, the shortest distance that the scanning head is allowed to leave the barcode gun on the barcode surface.


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


Scanning velocity refers to the scanning frequency of the scanning beam on the scanning track per unit time.

5) one-time recognition rate

The primary recognition rate represents the ratio of the number of tags read in the first scan to the total number of scanned tags. For example, if the information of a barcode label needs to be scanned twice for each reading, the one-time recognition rate is 50%. From the perspective of practical application, of course, we hope that every scan can be through the bar code gun, but unfortunately, due to the impact of a variety of factors, it is impossible to achieve a recognition rate of 100%.

It should be noted that the primary recognition rate is only applicable to the handheld light pen scanning method. If the laser scanning method is used, the beam can scan the barcode label hundreds of times per second, and the signal obtained by scanning is repeated.

6) bit error rate

Bit error rate (ber) is a very important test index to reflect the misidentification of a machine identifiable label system. Bit error rate is equal to the ratio of the number of error identification times to the total number of identification times. For a bar code system, bit error rate is a more serious problem than the low primary recognition rate.