Pressure Cycle Test –
Accoson greenlight 300 sphygmomanometer
To subject the greenlight 300 to a minimum
of 10,000 pressure cycles, each one representing a full
scale inflation and deflation, in the manner of a manual
inflation and deflation of the device as in normal use.
The greenlight 300 was connected to a
standard reference manometer with a pressure cycle function.
It was then subjected to a total of 10,500 pressure cycles
over a period of ten days. Each pressure cycle was a rise
then a fall in pressure starting at 0 mmHg and ending at
300 mmHg as follows:
0 –100 / 100 – 90 / 90 – 180 / 180 –
170 / 170 – 250 / 250 – 235 / 235 – 275
275 – 260 / 260 – 300
The time dwell at each pressure was the minimum in order
to allow the reference manometer to stabilise at the set
At the start of each session the calibration of the greenlight
300 was checked in steps of 20mmHg from 0 to 300mmHg. The
automatic pressure cycle was then run, and the number of
cycles noted. The calibration was then checked again both
before and after the greenlight was turned
off which activates the automatic pressure zero. All three
sets of readings were noted, together with the temperature
and the number of pressure cycles applied.
The results were expressed as VERNIER units, each one being
Note: The vernier display is made up of 5 LED’s for
each 1 LED in the main display. Each vernier represents
0.4mmHg, and each main scale LED represents 2mmHg. To interpret
the calibration results it is necessary to multiply the
figure shown in the table by 0.4mmHg in order to arrive
at the actual error in mmHg.
A total of 640 pressure readings were recorded
238 (37%) indicated an error of 0 mmHg
298 (47%) indicated an error of 0.4 mmHg
104 (16%) indicated an error of 0.8 mmHg
The maximum indicated error both during the test and after
10,000 pressure cycles was +/- 0.8 mmHg, confirming compliance
with both European and American standards which specify
a maximum error of +/- 3 mmHg.
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