Citizen GSX-190 Service Manual Page 67

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PN 4237242C
2.5-3
INSTRUMENT DESCRIPTION
DATA ACQUISITION
2
Figure 2.5-1 Sensor Preamp Adapter Card
Hgb Preamp Card
The Hgb Preamp card is located in the lower chassis (Figure 2.2-2). It is a hemoglobin
detector amplifier producing the HEMOGLOBIN signal for the URA card. The Hgb Preamp
card is a variable gain (to 11 times) amplifier and a current-to-voltage converter. It takes the
current signal from the Hgb detector mounted to the WBC bath, amplifies it and converts it,
then sends it to the URA card. An A/D converter on the URA card makes the information
available to the system program.
There are two adjustments built into the amplifier, one for adjusting overall gain and one for
adjusting the amplifier offset. The gain adjustment compensates for optical differences in the
light path and optical components. It assures an output voltage to the URA card that provides
maximum resolution of the A/D converter. The offset adjustment is used to compensate for
7242013A
J1
(From Linear
Power Supply
card)
J2
(From Linear
Power Supply
card)
J3
(Out to
URA)
J4
(Out to
SPAD)
J5
(Analog
voltage
spare)
J6
(Analog
voltage
spare)
X7
(ON)
X8
(OFF)
J11
(RBC signal
out to SPAD)
J12
(PLT
signal
out to
SPAD)
J9
(WBC
signal
out to
SPAD)
R7
X3
(OFF)
X4
(ON)
R8
J7
(Diagnostics)
J10
(On back
of card)
J8
(On back
of card)
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