Cal. 7K52A
18
1) While pressing the crown, turn it clockwise to screw it in.
2) Press the button at the 10 o’clock side repeatedly to reset the 1/10 m depth, depth and maximum
depth hands to “0” position.
(If they are at “0” position, it is not necessary to follow this step.)
3)
Put the watch into the water tank of Water Resistance Tester S-470, and apply 1.00 kg/cm of pres-
sure.
4)
Make a note of the depth displayed by the watch.
5) Apply pressure gradually, and make a note of the depth displayed by the watch when 3.00 kg/cm of
pressure is applied.
6) If the obtained depths fall within the range shown in the table below, the pressure sensor is normal
and accurately measures the depth.
Decreasing the pressure
(More than 15 minutes)
• Remarks on the water resistance test
Increasing the pressure
(More than 15 minutes)
Pressure value
1.00 kg/cm
2
3.00 kg/cm
2
Depth display of Cal. 7K52A
8.5 ~ 10.5 m
27.5 ~ 30.5 m
TECHNICAL GUIDE
2
2
Pressure
Elapsed time
Keeping the pressure constant
97-7 Printed in Japan
• Accuracy of the pressure sensor
To precisely measure the accuracy of the pressure sensor, use Water Resistance Tester S-470, which is equipped
with a transparent water tank and a digital water pressure gauge, or Water Resistance Tester S-461.
Procedure for measuring the accuracy of the pressure sensor (when using Water Resistance Tester S-470.)
1) Use a water pressure type water resistance tester such as S-470 and S-461. Never use an air
pressure type tester as it may cause damage to the pressure sensor.
2) In checking the water resistant quality of the watch using the water resistance tester, increase and
decrease pressure gradually taking more than 15 minutes in each process.
Revision: 2007/09/13
