Σx 2 or Σy 2

Sum of all x 2 values or y 2 values

Σx y

Sum of (x z y) for all x-y pairs

„Process capability

Step : ( See Example 53~54. )

1. Press [ DATA ] and there are three menus : DATA–INPUT,

LIMIT–SET, DISTR. Please select LIMIT–SETand press

[ ].

2. Enter an upper spec. limit value ( X USL or Y USL), then press [ ].

3.Enter a lower spec. limit value ( X LSL or Y LSL ), then

press [ ].

4.Enter the datasets you want under DATA–INPUTmode.

5.Press [ 2nd ] [ STATVAR ] and scroll through the statistical

results menu by [ ] or [ ] to find out process capability variables you want. ( See table below )

VariableMeaning

Cax or Cay Capability accuracy of the x values or y values

,

Cpx or Cpy Potential capability precision of the x values or y values,

,

Cpkx or Cpky Minimum (CPU, CPL) of the x values or y values, where CPU is upper spec. limit of capability precision and CPL is lower spec. limit of capability precision

Cpkx = Min (C PUX , C PLX) = C px(1 – C ax ) C pky = Min (C PUY , C PLY) = C py(1 – C ay )

(Note) : When calculating process capability in 2–VARmode, the

xn and y n are independent with each other.

„Probability distribution

Step : ( See Example 55. )

1.Based on the datasets in 1–VARmode, press [ DATA ] and there are three menu : DATA–INPUT, LIMIT–SET, DISTR.

Please choose DISTR and press [ ].

2.Enter a a x value, then press [ ].

3.Press [ STATVAR ] and scroll through the statistical results

menu by [ ] or [ ] to find out probability distribution variables you want. (See table below)

E – 17

File name : CBM_SR285,A_HDBSR285T19_English.doc

version : 2010/04/26

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Citizen SRP-280N/SRP-285N manual „ Process capability, „ Probability distribution, Σx 2 or Σy, Σx y
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SRP-280N, SRP-280N/SRP-285N specifications

The Citizen SRP-280N and SRP-285N are both advanced thermal printers designed to meet the needs of various industries, including retail, hospitality, and logistics. Known for their reliability and performance, these models are particularly favored for their speed and efficiency in printing receipts and labels.

One of the standout features of the SRP-280N is its high-speed printing capability. It can produce printouts at an impressive rate of 200 mm per second, ensuring that businesses can process transactions quickly, which is crucial during peak hours. Similarly, the SRP-285N offers rapid printing speeds, making it ideal for environments where time is of the essence.

Both models utilize direct thermal printing technology, which eliminates the need for ink or ribbons, reducing maintenance costs and downtime. The printers are equipped with easy-to-load paper mechanisms, allowing users to quickly replace paper rolls with minimal disruption to workflow. This feature is particularly advantageous for high-volume settings where efficiency is paramount.

The Citizen SRP-280N and SRP-285N support a variety of paper widths, making them versatile for different printing tasks. The models can handle standard thermal paper rolls, commonly used for receipts, as well as labels, catering to diverse business requirements. This flexibility is further enhanced by the compatibility of both printers with various operating systems, including Windows and Android, ensuring seamless integration into existing systems.

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Overall, the Citizen SRP-280N and SRP-285N printers combine speed, versatility, and durability, making them an excellent choice for businesses that require reliable printing solutions. With their advanced technology and thoughtful design, these printers can significantly enhance operational efficiency in any setting.
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