Inkjet printers are expanding for its possibilities of printing not only documents but also photos. In ECMA-74, which stipulates measurement method for printer noise, it is required to be measured while printing three or more sheets in order to ensure measurement reproducibility. In addition, the ISO1120x series, which defines the measurement of sound pressure levels, is required to measure more than 30 seconds. For printers printing for documents, it is not difficult to print three cycles at A4 size paper within 30 seconds. However, printing for photos, there are several devices take more than 30 seconds to print one A4 sheet in order to print for detail. So, when we preform the measurement during three cycles such as the slow printing operations, it will be necessary to spend more time on the evaluation. Therefore, we compared the measurement value with printing at 3 sheets or 1 sheet in slow operations more than 30 second to print one sheet. Also, we evaluated in its reproduction conducted at various laboratories. We propose a method for reducing the number of sheets requirement for printers with slow printing operations.