FUNCTIONAL DESCRIPTIONS
10-16 Sysmex SF-3000 Operator's Manual -- Revised September 1995
8. MAIN UNIT ELECTRONIC SYSTEM
The Main Unit microprocessor controls the hydraulic system, solenoid valves and master
valves; thus, it controls the flow of the sample, reagents, and waste fluid within the
hydraulic system.
The signals received from the detector blocks are processed at the analog unit and sent to
the microcomputer. There the analog signals are converted into digital signals, and
processing is executed.
The RBC and PLT blood cell signals are processed at the analog unit and sent to the
waveform processing circuits. Noise is removed and only required blood cell signals are
produced. The microcomputer converts the digitized cell signals into histogram data,
computes and displays the results, then stores data in memory.
As for the cell signals from the 4DIFF channel and WBC/BASO channel, the low-angle
and high-angle signals are sent to the waveform processing circuit, noise is removed to
produce required blood cell signals. The microcomputer converts the digitized cell
signals into histogram data, calculates, displays the results, and stores data in memory.
The HGB is calculated by deducting the absorbance of the diluent (blank) from the
absorbance of the sample. Absorbance is computed as follows: Light that passes through
the fluid is received by a photo diode, photoelectrically transformed, and converted into a
digital signal. This signal is then sent to the RBC system computer, where the HGB data
is computed.
The microprocessor computes the analyzed parameters; MCV, MCH, MCHC, RDW-SD,
RDW-CV, PDW, P-LCR and MPV.
Altogether, the data from 23 parameters are displayed on the LCD screen. The
instrument can output this data to external devices such as the host computer, data
printer, graphic printer, and line printer.
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