Welch Allyn MicroTymp 3 portable tympanometric instrument - User Manual - Manual (Page 25)

Directions for use Understanding the LCD messages 25
Block
The test cannot continue since the measured admittance is less than 0.2 mmho.
Possible causes:
• Probe tip is lodged against canal wall
• Ear canal occluded
• Collapsed ear canal
• Extremely small ear
• Probe tip is clogged with cerumen
Possible solutions:
• Reposition the probe tip
• Perform otoscopy to check for occlusion
• Remove cerumen from probe tip
Leak
The test cannot proceed since desired pressures within the ear have not been achieved.
Possible causes:
• Probe tip is not completely sealed in the ear canal
• Excessive movement of patient or practitioner
• Probe tip dislodged during a test
-400 -200 0 200
2
0.5
0
1.0
1
GR
A
GR
C
PRESSURE - daPa
Ya - mmho
+200 Vea - cc