User's Manual Part 10

164 Specifications Welch Allyn Propaq LT Vital Signs Monitor
Sample rate 363.64 Hz (181.82 Hz to Acuity)
Input protection Protected against electrosurgery and defibrillator when used with ECG cables specified
in the Welch Allyn Products and Accessories guide.
Electrosurgery interference
suppression
Included on all vectors when Welch Allyn-approved cables are used.
Lead
-fail sense current 70 nA DC typical for active leads
140
-280 nA DC typical for reference electrode, depending on number attached.
Tall T
-wave rejection Meets AAMI (USA) EC13-2002, section 4.1.2.1.c, up through 1.2 mV, using AAMI test
waveform
Common mode rejection
FILTER function OFF
FILTER function ON
< 1 mV p
-p RTI for 10V rms, 50/60 Hz into unbalanced input
< 30 μV p
-p RTI for 10V rms, 50/60 Hz into unbalanced input
Input impedance > 2.5 MΩ single
-ended @ 60 Hz
Input range (AC) 10 mV peak
-to-peak (local display)
10 mV peak
-to-peak (Acuity)
Input range (DC) Up to ±500 mV
Accuracy of input signal
reproduction
-impulse
response
Requires ECG bandwidth to be set to extended mode.
System noise
≤ 30 µV peak-to-peak, RTI notch filter on
Baseline recovery (trace
restore)
Automatic
QRS detector Adult or pediatric amplitude range: 0.22 to 5.0 mV (RTI)
Neonate amplitude range: 0.1 to 5.0 mV
Adult width range (duration): 70 to 120 msec
Pediatric or neonate width range (duration): 40 to 120 msec
HR range (in all patient modes) 25 to 350 beats/min (measurement)
25 to 300 beats/min (display)
Alarm limits 25 to 298 beats/min (lower)
27 to 300 beats/min (upper)
HR resolution 1 beat/min
HR alarm resolution 5 beats/min
HR meter response time Responds to change in heart rate within 13 seconds depending on physiological
waveform. (As measured per AAMI standard EC13
-2002 clause 5.1.2.1 (f), including
4.1.2.1 parts f. and g. waveforms.) Includes 1
-second readout update interval.
HR accuracy ±3 beats/min or 3%, whichever is greater
HR display update interval at
monitor
1 second
AAMI HR response to
“ineffectively paced QRS
pattern”
Indicates rate of 30 to 46 during AAMI EC13
-2002 part 5.1.4 part (f), (g), and (h) tests.
NOTE: AAMI Test 5.1.4 part (f), (g), and (h): Accuracy is affected when QRS and pacer
spikes are nearly simultaneous as occasionally is the case during this test.
Table 13. Specification: ECG (continued)