GE Corometrics 250 Series, Service Manual, Page: 130 / 252

4-50 250 Series Maternal/Fetal Monitor Revision D
2020551-001
Maintenance: J102 Analog Output Connector DAC Static Test
Calibration
For calibration, you must use the specific values listed in Table 17 (Corometrics
output levels) or Table 18 (Hewlett-Packard output levels). This tests the high and
low ranges for the HR1, HR2, and UA signals. If a measured value does not fall
within the given range, adjust the corresponding potentiometer accordingly (on
Communications Board, No. 13388 or 15297).
J102 Analog Output Connector Screen
J102
Pin Signal Range Voltage Meaning
3 Analog Gnd 0.00 0.0
7 HR1
±
1.2 -1.20 - - - bpm
22 HR2
±
1.2 -1.20 - - - bpm
2 UA
±
1.2 -1.20 0
17 HR1Mode
±
10 -10.00
1 HR2Mode
±
10 -10.00 Test
24 UAMode
±
10 -10.00
20 Markout* 0-5 5 Off
18 Chk Paper* 0-5 5 Off
14 FMD1 0-5 0 Off
15 FMD2 0-5 0 Off
Decimal Exit
Table 17. DAC Output Voltages and Adjustment Points for Corometrics Central Station Outputs
Analog Signal Measurement Site
Service Screen
Setting
Expected Voltage Adjustment Site
HR1 J102, pin 7
– – – –1.2 V ± 10 mV R18
240 bpm +1.2 V ± 10 mV R20
HR2 J102, pin 22
– – – –1.2 V ± 10 mV R27
240 bpm +1.2 V ± 10 mV R29
UA J102, pin 2
0 relative units
(mmHg and kPa)
–1.2 V ± 10 mV R42
100 mmHg
13.3 kPa
+1.2 V ± 10 mV R44