Welch Allyn Inc.
Aneroid Sphygmomanometers Service Manual
Revision A
Welch Allyn Inc.
Page 18 of 40
Check and finish calibration:
19. Remove the pointer and test dial, replace the gauge’s dial.
20. Place pointer onto pinion and resting in center of oval. Tap pointer with small
hammer slightly to secure.
21. Apply 320 mmHg to the gauge.
22. Release pressure to 300 mmHg and take readings here and at given points
(see section 1.3)
23. If pointer is greater than 300, pull pointer until you feel slight resistance
counter-clock wise, tap pointer with small hammer and recheck. Make sure
pointer returns to the oval each time. Repeat until satisfied.
24. If less than 300, rotate pointer 1 complete revolution clockwise until
resistance is felt. Push pointer a little farther and tap pointer with small
hammer and recheck. Make sure pointer returns to the oval each time.
Repeat until satisfied.
25. Place crystal and bezel back onto gauge and check.
Please see section 8.8 for a drawing of the Welch Allyn Tycos Movement
