20Blood pressure valuecategorySystole(in mmHg)Diastole(in mmHg)ActionHigh normal 130 – 139 85 – 89 regular monitoringby doctorNormal 120 – 129 80 – 84 self-monitoringOptimal < 120 < 80 self-monitoringSource: WHO, 1999 (World Health Organization)6. Saving, retrieving and deleting results• The results of each successful measurement are stored togetherwith date and time. With more than 60 items of measured data,the earliest items of data measured are lost.• To recall measurements, press the memory button M. The devicefirst shows the number of used memory spaces and then changesautomatically to the average of all stored measurements .• By pressing the memory button M again, the most recent individ-ual measurements are displayed with the date, time and graphicWHO classification, while the blood pressure values and the pulseare displayed in turn.• In the display of the individual measured values, you have theoption of clearing the memory by pressing the memory button Mfor 3 seconds. All values are deleted after 3 short beeps.7. Error messages/troubleshootingIn case of faults, the _ message appears in the display.Error messages may appear if:• systolic or diastolic pressure could not be measured ( orappears on the display)• systolic or diastolic pressure was outside the measurement range( or Lo appears on the display)• the cuff is fastened too tightly or loosely (Er3 or Er4 appears onthe display)• the pump pressure is higher than 300 mmHg (Er5 appears on thedisplay)• pumping up takes longer than 160 seconds (Er6 appears on thedisplay)• there is a system or device error (ErA, , Er7 or Er8 appearson the display)• the batteries are almost empty .In the above cases, you must repeat the measurement.Reinsert the batteries if necessary, or else replace them.Technical alarm – descriptionShould the recorded blood pressure (systolic or diastolic) lie out-side the limits specified in the section “Technical specifications”, thetechnical alarm will appear on the display indicating either “ ” or