Since 1969, the year TAG Heuer launched the world’s first automatic chronograph movement, coupling watch movement with chronograph function has become standard operation procedure. There is a serious “hitch”, however, with this isochronous system: its wheel chain gear system increases energy loss.
This is one of the greatest quandaries of chronograph design — how to keep chronograph operation from disrupting watch operation. A first avenue of research led to the TAG Heuer Calibre 360 in March 2005 with its additional module for the chronograph. Then the answer came with the TAG Heuer Mikrograph 1/100th of a second Chronograph in January 2011, ingeniously outfitted with two independent kinematic chains — one for the watch and one for the chronograph, integrated in the same movement.
The integrated movement with dual chain architecture, thereby eliminating the need for a clutch. Separating the watch chain from the chronograph chain eliminates the risks of the chronograph influencing the watch and vice-versa; but most importantly, it reduces energy loss and optimizes the precision of the chronograph’s regulating organ. This dual chain architecture allows the all “MIKRO” timepieces (MIKROTOURBILLONS, MIKROGIRDER, MIKROTIMER and MIKROGRAPH) to be ISO 3159 compliant across the board. The MIKROTIMER and the MIKROGRAPH are already COSC certified — i.e. with the chronograph function running, a feat virtually impossible to achieve by conventional mono-frequency chronographs.