Several Important Parameters About Barcode Scanners

A barcode scanner is an instrument that converts barcodes into data. Its main parameters are depth of field, resolution, scan width, scan speed, one-time recognition rate and bit error rate, etc.Now let's take a brief look at barcode scanners on the main parameters.

1. Depth of Field of the Barcode Scanner

The depth of field of the barcode scanner refers to the minimum and maximum range that the barcode scanner can read the barcode data. The range of depth of field of barcodes with different densities is different. For example, when scanning a barcode with a density of 10mil, it can be scanned with the scanner closest to it, and it can be scanned at a distance of 20cm at the farthest. Then the depth of field of this scanner on a 10mil barcode is 0-20CM. The same scanner scans a 5mil density bar code, and can only scan and read data from the scanner to 10cm, then the depth of field of this scanner for scanning a 5mil density bar code is 0-10cm.

2. The resolution of the barcode scanner

The resolution of the barcode scanner is an important parameter to measure the width of the narrowest bar code read in correctly. The full English name is: MINIMAL BAR WIDTH, abbreviated as MBW;

When choosing a scanning gun, it is not that the higher the splitting rate of the device, the better, but the scanning gun with the corresponding resolution should be selected according to the barcode density used in the specific application, because the barcode scanner with high resolution will not be able to scan the barcode. The quality also has higher requirements, such as when the barcode quality is not high, it may not have a good effect.

3. Scanning width of barcode scanner

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

4. Scanning speed of barcode scanner

The scanning speed refers to the scanning frequency of the scanning beam on the scanning track per unit time.

5. One-time recognition rate of barcode scanner

The one-time 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 each barcode label needs to be scanned twice, the recognition rate will be 50%. From the perspective of practical application, of course, it is hoped that each scan can pass, but unfortunately, due to the influence of various factors, it is impossible to require a recognition rate of 100%.

Note: The test index of one-time recognition rate is only applicable to the hand-held light pen scanning recognition method. If the laser scanning method is used, the scanning frequency of the beam on the barcode label is as high as hundreds of times per second, and the signal obtained by scanning is repeated.

6. Bit error rate of barcode scanners

The bit error rate is an extremely important test indicator that reflects the misidentification of the barcode scanner's identifiable labeling system. The bit error rate is equal to the ratio of the number of false identifications to the total number of identifications. For a bar code system, the bit error rate is a more serious problem than the low one-time recognition rate.