Nissei WS-820, Instructions Manual, Page: 9 / 76

METHOD OF MEASUREMENT
This product employs the oscillometric method for measurement of blood
pressure and heart rate. The entire system, including the cuff, is a single
wrist-mounted unit. The cuff is wrapped around the wrist and automatically
pressurized. Circuits within the cuff sense the small oscillations in pressure
against the cuff produced by the expansion and contraction of the arteries in
the wrist in response to each heart beat. The amplitude of each pressure
waves is measured, converted to millimeters of mercury, and displayed on the
LCD as a digital value. Responding to heart beats, the electromagnetic
INDICATIONS FOR USE
The WS-820 system is intended for the non invasive measurement of systolic
and diastolic blood pressure and determination of heart rate in adult, i.e., age
15 and above. The product is recommended for use by people with labile
(unstable) blood pressure or known hypertension in a home care environment
as an adjunct to medical management. The cuff will accommodate a wrist
circumference range of approximately 125 to 215 millimeters. Pressure is
measured over a range of 0 to 300 mmHg and heart rate over a range of 40 to
160 beats/minute.
CONTENTS
BASIC PRODUCT INFORMATION
PICTORIALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
BASIC PRODUCT INFORMATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . 9
PRECAUTIONS FOR USE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TIPS ON TAKING YOUR BLOOD PRESSURE . . . . . . . . . . . . . . 11
INSTALLING BATTERIES AND SETTING THE CLOCK . . . . . 12
WRAPPING THE CUFF AROUND YOUR WRIST . . . . . . . . . . . . 12
CORRECT MEASURING POSTURE . . . . . . . . . . . . . . . . . . . . . . . . 13
MEASURING METHOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
MEMORY FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
ERROR DISPLAYS AND TROUBLESHOOTING . . . . . . . . . . . . . 15
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
TECHNICAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
This manual is intended to assist the user in the safe and efficient operation of the Model WS-820 Automatic Digital Electronic Wrist Blood Pressure Monitor. The
product must be used in accordance with the procedures contained in this manual and must not be used for purposes other than those described herein. It is
important to read and understand the entire manual. In particular, please read carefully and become familiar with the section entitled “TIPS ON TAKING YOUR
BLOOD PRESSURE”.
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