| 摘要 |
A portable photoanalytical device takes a reflectance reading from a reagent test strip, compares the reading to an internal standard, and translates the reading to a concentration value using constant values stored within a RAM chip. The constant values are preprogrammed for a particular lot of reagent test strips. A battery maintains the information stored in the RAM. The control values are initially downloaded into the RAM via an external connector. The concentration values are accumulated in the RAM, and periodically dumped out of the device through the external connector. The integrity of the information stored in the RAM is monitored by computing a checksum. Preferably the device includes a battery-backed real-time clock providing the date and hour of each reading. The device can also be operated by an external computer for test purposes. |
