Welch Allyn Inc.
Aneroid Sphygmomanometers Service Manual
Revision A
Welch Allyn Inc.
Page 30 of 40
LOW GAGE READINGS - (Predominantly at 60 and 100)
1. Remove test pointer and test dial. Obtain calibration tool and position over
adjusting pin down to cross shaft. Lift tool approx. 1/16 inch and bend the pin
away from operator approx. 15 degrees. While maintaining this position, lift tool
to point where pin makes contact with the gear sector. Bend the pin down or
towards the operator approx. 30 degrees. Remove tool and release gear sector.
Check for gear sector starting position as defined previously, adjust if necessary.
Re-assemble test dial and pointer, recheck span and adjust as necessary prior to
inspection at intermediate points.
NOTE: In all adjustments during calibration, the gear sector starting position will
affect accuracy. Sometimes, this alone can be used as an individual adjustment
to achieve conformance. Higher readings will be realized when the gear sector is
extending beyond the edge of the top plate and lower readings will be realized
when it is within the edge of the top plate.
- See Section 8.9 for drawing of the S+K Movement.
