GE Corometrics 250cx Series Operator's Manual page 185

MECG Mode
Technique:
Maternal ECG Electrode Type:
Leads Available:
Heart Rate Counting Range:
Heart Rate Resolution:
Heart Rate Update Rate:
Countable Input Signal Range:
Baseline Drift:
Tall T-wave Rejection:
Heart Rate Meter Response Time:
80–120 bpm Step Increase:
80–40 bpm Step Decrease:
Alarm Time for Tachycardia 80–200 bpm:
Offset Voltage Tolerance (Differential):
Maximum Common Mode Voltage:
Preamplifier Bandwidth:
Common Mode Rejection:
Balanced:
Unbalanced 5K RA or LA:
Input Equivalent Noise: Input Impedance:
Differential:
Common Mode:
Mains Frequency Rejection:
Leakage Current:
Isolation, Mains-to-Patient:
Leads Off Detection:
Alarms:
Audio:
Visual:
Limits:
Technical:
Tachycardia Response Time:
Pacemaker Detection/Rejection:
Input Voltage Range:
Input Pulse Width:
Pulse Rise/Fall Time:
Overshoot/Undershoot:
CAUTION
Excessive overshoot time of pacemaker pulse may cause false QRS
detection.
Revision C
Technical Specifications: Operating Modes
Operating Mode Specifications (Continued)
Peak detecting, beat-to-beat cardiotachometer
Medtronic 1700-003 or equivalent
I, II, and III
30–240 bpm
± 1 bpm
> 1 update per second
0.5 mV to 5 mV peak-to-peak
< 0.5 mV RTI
0.8 QRS amplitude
x
< 2 seconds
< 3 seconds
< 10 seconds (high alarm limit at 100 bpm)
± 300 mVdc maximum
20 V peak-to-peak
0.6 to 40 Hz
> 80 dB at mains frequency, with patient cable
> 50 dB at mains frequency
< 30 µV peak-to-peak
> 2.5 MΩ
> 10 MΩ
> 40 dB
< 60 µA at 254 VAC, with cable, electrically isolated
> 4 kVAC
dc current < 0.1 µA
Alternating 1.5-second chimes
Flashing heart rate numeric or message
User-selectable high and low maternal heart rate
Leads off
< 8 seconds
± 2.5 mV to ± 700mV
0.1 to 2 ms
< 10% of pulse width; not greater than 100 µs
2 mV
250cx Series Maternal/Fetal Monitor
2036946-001
17-5