Service manual

PN 4237242C
A.1-1
A
A
QUICK REFERENCE INFORMATION
A.1 TOLERANCES, VOLTAGES AND LIMITS
Limits
ATTENTION:
Millivolts (mV) must be measured with a true rms (root mean square) DMM
(digital multi-meter). The FLUKE
®
Model 8920A or its equivalent is acceptable
.
Adjustments
Table A.1-1 Calibration Factor Limits
Parameter Expected Range
WBC 0.975 to 1.169
RBC 1.079 to 1.251
Hgb 0.774 to 0.898
MCV 0.897 to 0.949
Plt 1.004 to 1.214
MPV 1.074 to 1.278
Table A.1-2 Amplifier Noise Limits
Parameter Test Points Expected Range
WBC TP2, TP15 (ground) 50 to 90 mVrms
RBC TP3, TP15 (ground) 8 to 15 mVrms
Plt TP1, TP15 (ground) 40 to 80 mVrms
Table A.1-3 Adjustments
Item Adjustments
+24 V Power Supply V1 - This is set at the factory. It
cannot
and
must not
be adjusted in the field.
Hgb Preamp Card
r
R7 - Hgb preamp gain adjustment (adjusts output voltage)
r
R8 - Preamp offset adjustment (adjusts Hgb zero)
SPAD Card There are two potentiometers onboard, R85 and R86. These are factory
adjustments affecting the Editor circuit that require an oscilloscope and pulse
generator to set them. They
cannot
and
must not
be adjusted in the field.
URA Card
r
R5 - Display contrast
r
R6 - A/D converter zero adjustment
r
R7 - A/D converter scale adjustment
Vacuum Sensor Card R2 - The Gain adjustment calibrates the card and requires an accurate vacuum
measuring device to set it. It is a factory adjustment and
cannot
and
must not
be adjusted in the field.
C