User`s guide

Understanding the Extended Measurements Report
PageWriter 200/300pi M1771A/1770A Cardiograph 3-13
3
An Ashman unit is the area of 1 square millimeter at normal speed (25 mm/
sec) and normal sensitivity (10 mm/mV). An Ashman unit equals 40 ms x 0.1
mV.
QUALITY N/A Each character indicates a type of noise present in
the lead:
D - Baseline wander indicator. The onsets of two
successive QRS complexes differ by more than 1/
3 the calibration value.
T - Artifact, most likely muscle tremor. Occurs
when more than 16 up-and-down strokes exceed-
ing 1 mm in amplitude are detected within 1 sec-
ond.
W -Steady baseline drift exceeding 10 mm/sec.
A -Power line (AC) noise.
M -Missing lead.
NOISE N/A Indicates the severity of artifact reflected in the
signal data:
blank = Light noise
1 = Moderate noise
2 = Marked noise
3 = Severe noise
Table 3-1: Individual Lead Measurements (Continued)
Parameter
Units or
Va lue
Description