Fresenius Medical Care 4008 E Technical Manual page 180

Adjusting the current rise pulse:
– Select "calibrate flow 300 ml/min"; display: flow (300) = XXX.
– The actual flow XXX must be approx. 300; if necessary, correct it using the
– Connect an oscilloscope to MP8 and MP1, and the ground MP7 to P.C.B. LP 634.
– Use P1 to set the current rise pulse as shown in the diagram below. Make sure that the actual
flow (display XXX) remains at approx. 300; if necessary, correct it using the
GND
GND
Alternative adjustment of the current rise (if an oscilloscope is not available):
– Select "calibrate flow 300 ml/min".
– There are two possibilities of reaction by the machine:
1. The machine runs with regular balancing
chamber switching.
Display: flow (300) = XXX.
– If necessary, correct the flow using the
and keys, until the actual flow
indicates approx. 300.
– Turn the potentiometer P1 counter-
clockwise (wait for at least 10 sec after
each rotation!), until the machine swit-
ches to "Eigentakt".
– Display: flow (300) = 147.
– Now turn the potentiometer P1 clock-
wise (wait for at least 10 sec after each
half-rotation!), until the actual flow
again indicates approx. 300.
– Turn the potentiometer P1 clockwise
for another 2 rotations.
After adjusting the current rise pulse, check and, if necessary, readjust the 300/500/800
flow settings.
MP1 1 V/cm
MP8 2 V/cm
Time Base 1 sec.
2. The machine is in the "Eigentakt" mode.
Display: flow (300) = 147.
– Turn the potentiometer P1 clockwise,
until the machine switches from "Ei-
gentakt" to regular balancing chamber
switching (wait for approx. 10 sec after
each rotation!).
– Display: flow (300) = XXX.
– If necessary, correct the flow using the
indicates approx. 300.
– Turn the potentiometer P1 counter-
clockwise (wait for at least 10 sec after
each rotation), until the machine swit-
ches to "Eigentakt".
– Display: flow (300) = 147.
– Now turn the potentiometer P1 clock-
wise (wait for at least 10 sec after each
half-rotation!), until the actual flow
again indicates approx. 300.
– Turn the potentiometer P1 clockwise
for another 2 rotations.
Fresenius Medical Care 4008 4/08.03 (TM)
and
and
and keys, until the actual flow
keys.
keys.
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