Fresenius Medical Care 4008 E Technical Manual page 544

Bar graph displays for arterial and venous pressure (circuit diagram 2/6)
IC 3 and IC 4 are provided as data memories for the arterial bar graph display, whose 30 LEDs
are organized within a 5x6 matrix. The 5 lines are directly energized via the emitter sequence
IC 13 by data buses DB0 to DB4 and the 6 columns via the 8-out-of-3 decoder IC 14 by data
buses DB5 to DB7. The actual value (CS1) and the upper limit (CS2) are stored by IC 3 and the
lower limit (CS3) is stored by IC 4. The respectively applicable LED is energized via the clock
inputs CL1, CL2, and CL3. The clock pulses of CL1 have a longer duration than those of CL2 and
CL3. Thus, the actual value is represented more brightly than the limits.
IC 10 (CS4, CS5), and IC 11 (CS6) are provided as data memories for the venous bar graph
display. The working method of this display is identical with that of the arterial bar graph display.
Bar graph displays for TMP and conductivity (circuit diagram 3/6)
IC 17 (CS7) and IC 21 (CS8, CS9) are provided as data memories for the TMP bar graph display.
IC 4 (CS10) and IC 5 (CS12) are provided as data memories for the CD bar graph display.
The working method of both displays is identical with that of the arterial bar graph displays.
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Fresenius Medical Care 4008 4/09.03 (TM)