GE Corometrics 250cx Series, Service Manual, Page: 228 / 252

A-4 250cx Series Maternal/Fetal Monitor Revision C
2036947-001
Technical Specifications Operating Modes
Operating Modes
Table 2. Operating Mode Specifications
CAUTION
The monitor may produce incorrect results if
operated outside the minimum specified parameter
specifications in this table.
FECG Mode
Technique:
Heart Rate Counting Range:
Heart Rate Resolution:
Artifact Elimination:
Countable Input Signal Range:
Offset Voltage Tolerance (Differential):
Maximum Common Mode Voltage:
Preamplifier Bandwidth:
Common Mode Rejection:
Balanced:
Unbalanced 5k
Ω
RA or LA:
Input Equivalent Noise:
Input Impedance:
Differential:
Common Mode:
Mains Frequency Rejection:
Leakage Current:
Isolation, Mains-to-Patient:
Peak detecting, beat-to-beat cardiotachometer
30–240 bpm
± 1 bpm
Selectable, ± 25 bpm artifact rejection
15 µV to 2 mV peak-to-peak
± 300 mVdc maximum
20 V peak-to-peak
1–90 Hz
> 120 dB at mains frequency, with patient cable
> 110 dB at mains frequency
< 10 µV peak-to-peak
> 10 M
Ω
> 20 M
Ω
> 40 dB
< 60 µA at 254 VAC, electrically isolated
> 4 kVAC
Ultrasound Mode
Technique:
Transducer Type:
Pulse Repetition Frequency:
Single Ultrasound Mode:
Dual Ultrasound Mode:
Pulse Duration:
Transmitter Frequency:
Spatial-Peak Temporal Average Intensity:
Spatial-Average Temporal Average Intensity:
Focal 20 dB Beam Area:
Peak Instantaneous Intensity:
Peak-Negative Acoustic Pressure:
Heart Rate Counting Range:
Leakage Current:
Pulsed Doppler with autocorrelation processing
9-crystal
4 kHz
2 kHz
92 µs
1.151 MHz
Ispta < 10 mW/cm
2
Isata< 5 mW/cm
2
16.6 cm
2
, at a range = 7 cm
1.8 mW/cm
2
p < 10.0 kPa
50–210 bpm
< 10 µA at 120–240 VAC, isolated by transducer
Uterine Activity Mode
Range:
1
Resolution:
Bandwidth:
Excitation Voltage:
Zero Set Temperature Drift:
Leakage Current:
Strain Gauge Tocotransducer
0–100 mmHg (0–13.3 kPa) 0–100 mmHg (0–13.3 kPa)
1 mmHg (0.13 kPa) 1 mmHg (0.13 kPa)
dc to 0.5 Hz dc to 0.5 Hz
+4.0 Vdc
< 0.1 mmHg/°C (0.013 kPa/°C), excluding transducer
< 60 µA at 254 VAC, electrically isolated
1
The ranges shown here are typical ranges seen in a clinical setting.