Operating Modes - GE Corometrics 250cx Series Service Manual

Operating Modes

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 5kΩ RA or LA:
Input Equivalent Noise:
Input Impedance:
Differential:
Common Mode:
Mains Frequency Rejection:
Leakage Current:
Isolation, Mains-to-Patient:
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:
Uterine Activity Mode
1
Range:
Resolution:
Bandwidth:
Excitation Voltage:
Zero Set Temperature Drift:
Leakage Current:
1
The ranges shown here are typical ranges seen in a clinical setting.
A-4
Technical Specifications Operating Modes
Table 2. Operating Mode Specifications
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 MΩ
> 20 MΩ
> 40 dB
< 60 µA at 254 VAC, electrically isolated
> 4 kVAC
Pulsed Doppler with autocorrelation processing
9-crystal
4 kHz
2 kHz
92 µs
1.151 MHz
Ispta < 10 mW/cm
Isata< 5 mW/cm
2
16.6 cm , at a range = 7 cm
2
1.8 mW/cm
p < 10.0 kPa
50–210 bpm
< 10 µA at 120–240 VAC, isolated by transducer
Strain Gauge
0–100 mmHg (0–13.3 kPa)
1 mmHg (0.13 kPa)
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
250cx Series Maternal/Fetal Monitor
2036947-001
2
2
Tocotransducer
0–100 mmHg (0–13.3 kPa)
1 mmHg (0.13 kPa)
dc to 0.5 Hz
Revision C