Seiko 7D56A - TECHNICAL GUIDE: WATER RESISTANCE & ACCURACY TESTS; Water Resistance Test Standards; Accuracy Test Procedure

Cal. 7D56A
41/44
Technical guide
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Accuracy test
Measure the rate and make sure the value shows within ±0.50 s/d.
Use 10 seconds gate of the tester.
Check the water resistance according to the designated specification of the watch.
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Water resistance test
Marking on the case back Test method Applied pressure
WATER RESISTANT (WATER RESIST)
3 BAR
WATER RESIST 5BAR
5 BAR
WATER RESIST 10BAR 10 BAR
WATER RESIST 15BAR 15 BAR
WATER RESIST 20BAR 20 BAR
SCUBA DIVER'S (AIR DIVER'S) 150 m 18.75 BAR = 150 (m) times 0.125
SCUBA DIVER'S (AIR DIVER'S) 200 m
25 BAR = 200 (m) times
0.125
He-GAS DIVER'S 300 m
37.5 BAR = 300 (m) times 0.125
He-GAS DIVER'S 600 m 75 BAR = 600 (m) times 0.125
He-GAS DIVER'S 1000 m 125 BAR = 1000 (m) times 0.125
Water pressure test
Condensation test
Condensation test
Condensation test
Water pressure test
Air leak test