1. Regular Calibration Cycle
Aneroid sphygmomanometers for home use: Recommended calibration every 6-12 months.
Institutional use: Due to frequent use, calibration should be reduced to every 3-6 months.
2. Abnormal conditions requiring immediate calibration
Large deviation in measurement results: Systolic pressure error >5 mmHg or diastolic pressure error >3 mmHg compared to a standard hospital sphygmomanometer.
Damaged device: After being dropped, impacted, or exposed to moisture.
Hardware issues: Cuff leak, display abnormality, or button malfunction.
3. Initial Self-Verification Method
Comparative Measurement Method:
After sitting still for 5 minutes, take three measurements with a mercury sphygmomanometer and take the average value.
Immediately measure the same arm three times with an aneroid sphygmomanometer and take the average value. If the difference between two readings is >5 mmHg (systolic) or >3 mmHg (diastolic), calibration is required.
Environmental disturbances: After use in high temperature, high humidity, or vibration environments.
4. Shorter calibration intervals may be required in special circumstances.
For patients with hypertension: Calibration is recommended every 3-6 months.
Long-term non-use: Before re-use after storage of more than one year.
5. Calibration methods:
Professional institution: Choose a hospital or testing center with metrology qualifications, using the standard pressure source comparison method.
Brand after-sales service: Some manufacturers offer calibration services (certification must be confirmed).
