| 摘要 |
<p>An instrument for performing assays is taught including one or more of the following features: an APTT test is performed utilizing a bandpass filter centered at approximately 45Hz in order to provide the best analysis of scattered light for properly detecting the endpoint of the APTT assay; a floating theshold voltage is used for comparison with the output signal, thereby avoiding problems which cause false endpoint detection; periodic determinations are made to ensure that an adequate supply of sample is present in the sample well, thereby avoiding false indications of an adequate supply of sample due to sample drying; pulses of light are used rather than modulated light, thereby obviating the need for a modulator while providing scattered light from a sample which can be easily distinguished from ambient light; unique codes contained on a quality check device are utilized for customization, for example, to establish the language in which the prompts will be presented to the user, or the units of measurement which will be displayed; and a thermal code is used to control the temperature of the cartridge containing the sample and one or more reagents within very close tolerances.</p> |
