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Customers want to make informed decisions when buying printers and printing supplies. While printing capabilities, print quality and speed, product features, and ease-of-use are typically the most important considerations, consumers often want to compare costs as well. In recognition that customers have different needs, HP offers a broad range of printing systems with diverse printing capabilities and various combinations of purchase price and ongoing operating costs. Consumers need to look at a range of factors when comparing costs, including quality, reliability, support and productivity. Measurements of page yield and related estimates of cost-per-page (CPP) are one part of the economic picture. This article will discuss considerations in measuring color LaserJet yield.
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Comparing color laser yield measurements across manufacturers is difficult. Numerous factors affect yield measurement including the test document, print job size, print quality modes, end-of-life determination, sample size and environmental conditions.
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The Value of Recognized Standards
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While yield is only part of the overall costs of printing, HP wants customers to have meaningful information on all factors to help them make the best choice of printing systems. HP has developed robust, reliable yield measurement methodologies for its own printers and supports the development of rigorous industry-wide standards. HP participated in the development of, and fully supports, the ISO/IEC 19752 standard for determining monochrome toner cartridge yield for monochrome laser printers. The standard serves as a solid basis for reliably measuring yield. HP is also participating in the development of ISO industry yield measurement standards for cartridges for color laser and inkjet printers. These standards will help to improve yield testing throughout the printing industry and allow true comparisons.
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HP's Approach
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HP has developed a rigorous methodology to test color LaserJet print cartridge yields. It will be in use until the ISO color laser printer standard is final. HP developed a proprietary test page that allows consistent testing and accurate determination of yield. The test page emulates the typical customer printing of approximately 20% or 5% coverage for each color. (See examples of approximately 20% coverage below.) Considerations for the printing environment, sample size and statistical analysis are similar to the ISO/IEC 19752 monochrome laser standard.
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![Sample 1 (portrait layout) - Test page with approximately 20% overall coverage.](/pageyield/images/color_laser_sample_one.jpg) |
![Sample 2 (landscape layout) - Test page with approximately 20% overall coverage.](/pageyield/images/color_laser_sample_two.jpg) |
Examples represent typical business documents with approximately 20% overall coverage-cyan, yellow, magenta and black combined. |
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