BS ISO 1413:2016 Horology – Shock-resistant wrist watches

BS ISO 1413:2016 pdf free download.Horology – Shock-resistant wrist watches.
BS ISO 1413 specifies the minimum requirements for shock-resistant wrist watches and describes the corresponding test method.
It is based on the simulation of the shock received by a wrist watch while falling from a height of 1 m onto a horizontal wooden floor (an equivalent surface is described in Lid).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3158, Timekeeping instruments — Symbolization of control positions ISO 22810, Horology — Water-resistant watches
3 Terms and definitions
For the purpose of this document, the following definitions apply.
4 Test conditions
4.1 Test temperature
Throughout the test period, the ambient temperature shall be between 18 °C and 25 °C.
4.2 Water resistance
Watches labelled water-resistant shall comply with ISO 22810.
For watches being tested and labelled in compliance with ISO 22810, the water resistance must remain
intact after the shock exposures on watch heads. See 52.
4.3 Shock characteristics
The test apparatus for the three first shocks (shock test apparatus) and the test apparatus for the free- fall shocks shall comply with shock characteristics described in Annex A.
If the test apparatus for the free-fall shock cannot be checked according to Annex A. its impact surface shall be identical to the impact surface of the sabot.
4.4 Test apparatus
4.4.1 Material
Sabot (shock test apparatus) and impact plate (free-fall test apparatus) shall be made with the same material (see &L.1).
4.4.2 Shock test apparatus
An example of test apparatus for the shocks is described in Annex B and shall comply with its specifications.
4.4.3 Free-fall test apparatus
The free fall shall be from a height of 1 m.
4.5 Preliminary settings of the test samples
4.5.1 Determination ol the rate for mechanical watches
The rate of the watch under test shall be checked 30 mm to 60 mm after winding to maximum. respecting a stabilization time  30 s prior to any rate measurement. The rate measurement duration shall be  40 s in each of the positions FH, 6H and 9H in accordance with ISO 3158, using an apparatus capable of measuring the instantaneous rate.
4.5.2 Determination of the rate for quartz watches
Quartz watches shall function for at least 2 h before starting the test; after this period, the rate shall be
checked in position CH or FH using an apparatus for measuring the instantaneous rate.
4.5.3 Determination of the watch head setups
— Mechanism for the drive of calendar or other watch display items shall be set in a non-engaged, non- armed position.
— Chronograph display items shall be set in the reset (zero) position.
— LCD segments or any other electronic display item shall be checked and should all be functional.
— The time setting and (if applicable) the calendar setting function shall work correctly, without gear disengagement or abnormal rotating friction.
— The stop function of the watch movement (if applicable) shall work correctly.
— All functions of push buttons or sliding switches, e.g. Start — Stop — Reset of chronographs; On — Off function for buzzer, lighting or any other function present, shall work correctly.
— Functional elements providing any mechanical, vibrating, acoustic, or any other signals shall be functional.
— Screw-down crowns or push buttons (if applicable) shall be set to the screwed-down position, as in normal use. Other crowns shall be set in the normal use position.
5 Test method
5.1 General
Watches to be tested shall be separated for two different procedures.
— Shock test procedure applies to functional watch heads only and shall be used for shocks 1, 2 and 3.
NOTE Shock 3 can be applied on a different watch head than that used for shock 1 and 2.
— Free-fall test procedure applies to complete watches with bracelets (including movement or equivalent dummy) and shall be used for free-fall shocks 1 and 2.
Flowcharts summarizing the following procedures (2 and £3) are described in Annex D.
5.2 Procedure for shocks on watch heads
5.2.1 General
The watch heads shall be tested without having a bracelet or a strap attached.
The watch heads are exposed to shocks applied with an apparatus complying with Annex B or equivalent.
Watches labelled water-resistant shall comply with ISO 22810, where water resistance must remain intact after the shock exposures on watch heads.
NOTE Water-resistance can be checked after each shock.
5.2.2 First shock
5.2.2.1 Watch setups and shock description
The time shall be set at 12:00 am position, ±2 mm.
Possible time setting positions before first shock are given in Figure 1.
Similarly, in the case of watches with a digital display, the shock shall be applied at the same location.
5.2.2.2 Requirements after the first shock
The displacement of the minute hand shall be observed in reference to the initial time setting position (see Figure 3):
On LCD or electronic displays, there is no displacement tolerance, all segments shall remain functional.
5.2.3 Second shock
5.2.3.1 Watch setups and shock description
No specific setup is required.
The shock shall be directed against the glass, perpendicular to the plane of the watch head. See Figure 4.
5.2.3.2 Requirements after second shock
5.2.3.2.1 Quartz watches
Allowing a recovering period≥5 min after the second shock, the rate of the watch shall be checked in position CH or FH using an apparatus capable of measuring the instantaneous rate.
5.2.3.2.2 Mechanical watches
Allowing a recovery period≥5 min after the second shock and after a stabilization time≥30 s prior to any rate measurement, the rate of the watch shall be measured.
The rate measurement duration shall be 2 40 s in each of the positions FH, 6H and 9H using an apparatus capable of measuring the instantaneous rate.
The residual effect on the rate shall be calculated from the greatest difference of rates determined in the same position.
For practical reasons, the above measurements can be done with a time delay  60 mm after winding to the maximum.
5.2.3.2.3 Permanent residual effects
— Changes of the rate shall not exceed: 2 s per day for quartz watches or 60 s per day for mechanical watches.
— Permanent changes of the time (hour and minute) are not accepted.
— Permanent changes on day and/or date are not accepted.
— Changes of electronic display items causing mistakable or non-determined time reading are not accepted.
— The examination of the watch shall not reveal any permanent deterioration affecting its functions, its performance or its appearance (e.g. hands bent or fallen off, altered display, impaired automatic device or calendar, rotating bezel, cracked glass, bent horns, bent or broken crown or damaged push-button, etc.).
5.2.3.2.4 Reversible residual effects
— Reversible changes of the time displayed after the shocks shall not exceed —5 min/—30°, respectively for the angular displacement of the minute hand, as shown at 5222.
— Changes of the chronograph, alarm, countdown and any other time displayed after the shocks are accepted.
— Reversible changes of the date displayed (including day and date hands) after the shocks are accepted.
5.2.3.2.5 Water resistance
Watches labelled water-resistant and not used for the third shock shall comply with ISO 22810.
5.2.4 Third shock
5.2.4.1 General
This test exposes the crown and the winding stem to one controlled shock.BS ISO 1413 pdf free download.BS ISO 1413:2016 Horology – Shock-resistant wrist watches