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Choice Vital Signs Monitor MD500B - Operation Guide

CHAPTER 2 Operation Guide

2.1. Battery Loading

md500ba.      Open battery cover at the back of the device.

b.     Load two �AAA� size batteries. Please pay attention to polarity.

c.      Close the Battery Cover.

When LCD show battery signal it means you must change the batteries at once.

Rechargeable batteries with a voltage of 1.2V are not suitable for this product.



The equipment, the batteries and cuff used in it can be disposed as industrial rubbish at the end of their usage.

2.2. NIBP Measurement

2.2.1 Wrist Cuff Connecting

a. Be sure to place the wrist cuff on bar skin of left wrist and placingsphygmomanometer on the center of wrist.

b. Place wrist cuff 12cm above wrist joint.

c. Wrist cuff connecting should make wrist feel no tension.

When the cuff is dirty, detach it from the equipment, wash the cuff by hand with proper detergent and rinse it in the enough cold water. Dry in air. Never iron it.

Do not connect to tense (otherwise the measurement will be not precise).

d. If the cuff is too long, fix the over plus cuff on the Nylon fibulae of cuff.



This product can not be used on infants.

This product can not be used on other user than blood pressure measuring.

e. Keep up right position on the same position of heart.

f. To avoid arm moving, place the translucent plastic package of the sphygmomanometer under the arm is recommended.

2.2.2 Start up

a. After your body is a comfortable position, press the �start� button to switch the power, BPM will begin to work and examine itself. All LCD will glimmer for 2 seconds.

b. After examining itself, LCD glimmer and BPM begin automatic inflation.


This machine presets four levels of inflating pressure value, namely 187, 225, 263, 300mmHg.




When starting to measure, this machine will choose suitable level of inflation pressure automatically depending on you own blood pressure.


You can select manual inflation to your need value in one time switch, the method is to keep on pressing the pressurization to the value you need.




2.2.3 Measuring process

a.      After pressurization has been completed, the pressure will be gradually reduced, the LCD displays �TESTING�, BPM will measure the blood pressure and heart rate automatically.

b.     During the measurement, when you pulse signal is checked, �♥� start to glimmer; LCD show the pressure is decreasing. Please do not speak or move your arm and body during measuring.

If there is any abnormality, please refer to the �Abnormality Troubleshooting� section.

c.      After a long beep the automatic measurement completed, the blood pressure value will appear.



2.2.4 Reading Result of Measurement

a. LCD will automatically display the systolic and diastolic pressure reading in mmHg unit after each measurement. Pulse rate (pulse/min) is also displayed. The row with �♥� is pulse rate.




2.2.5 Re-measuring

If you want to measure again, just press the �START� button.

Between each measurement, you need 3-5min to let blood circulation of the arm to recover.

Since blood pressure responds greatly over to minute changes in the body, it is unusual for it to continuously remain at the same value. For this reason, it is recommended that blood pressure be judged on the basis of multiple measurements.

2.2.6 Reading Memory

a. If you want to check the last result, you need to press the �MEMORY� button when the BPM is turned on, then LCD will display the result.

b. Press �MEMORY� button continuously, previous measurement results will be displayed one by one.

BPM will automatic memorize result after each measurement. After 91st measurement,

Its result will be memorized by BPM automatic while the 1st memory is automatically deleted.

2.2.7shut down

a. Press the �START� button to switch the power off. BPM has automatic �turn off� function that means if you forget to shut down the instrument; it can turn off the power itself about 3 minutes later.

     This equipment may stop working if there is an interference of electrostatic discharge.




2.3. SPO2 measurement

2.3.1 Diagram of Operation Principle


1. Red and Infrared-ray LED

2. Red and Infrared-ray Reception Diode

2.3.2. Operation Instructions

ANip the clamp as diagram

BPlug one of fingers into rubber hole of the monitor (it is best to plug the finger thoroughly) before releasing the clamp

CPress the switch button once on front panel.

DYour finger do not tremble during the monitor is working. Your body is not recommended in moving status

ERead correspondent datum from display screen.

FTwo display modes


After turn on the monitor, each time you press the power switch, the monitor will switch to another display mode, there are 2 display modes shown as follows:




Declaration: Please use the medical alcohol to clean the rubber touching the finger inside of monitor and clean the test finger using alcohol before and after each test. (The rubber inside of the monitor belongs medical rubber, which has no toxin, and no harmful to the skin of human being).

When your finger is plugged into the Spo2 monitor, your nail surface must be upward.



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