The accuracy rate of a mechanical watch depends on many factors, such as the time during which the watch is worn
vs. time sitting on a stand, the amount of arm and body movement, the varying level of torque, temperature
Testing with a timegrapher shows how the watch runs right now, in this exact position, and at this level of power. This "bench" rate rarely corresponds to the watch real-life accuracy, so regulating to 0 S/D makes little sense. Instead, the relative adjustment described below might be more appropriate.
Not all watches are created equal. Some are easy to regulate, others — nearly impossible. Before proceeding further, execute a couple of 12 Hour Tests on the watch to examine its rate stability graph.
Set the watch and wear it for a long period of time, ideally two full weeks. During that period perform all the
routines: walk, drive, exercise, etc. Leave the watch in the same position at night (e.g. Dial Up). If
you manually wind, always do so at the same time and the same amount (e.g. 10 turns every morning or evening).
the end of the period, record the accuracy rate.
This is the "Known" rate for your watch when worn.
Set watch time so that the test it is not affected by day/date complications — for example 5:00 AM after
the date has changed. Wind the watch fully, open the case back, put it in the Dial Down position, ready for
adjustment. Leave it untouched for an hour to temper and settle down. Place the headset mic over the movement, and
execute a LONG TEST of 60 minutes. Record the AVERAGE RATE shown.
This is the "Measured" rate of the watch, when tested on the bench.
The "Target" rate is what this watch should demonstrate on the bench, in order to be
near 0 S/D
This is calculated as the difference between the Measured and the Known rate. For example, for a Known rate of +10 S/D and a Measured rate of -3 S/D, the Target would be -13 S/D.
[ Target Rate Calculator ]
Keep the watch in the same position. Switch to the INSTANT module of the app. Slightly adjust the regulating lever so that the INSTANT RATE shown is close to the Target rate. Switch to the LONG TEST module and run a 10+ minute test for a more representative AVERAGE RATE. Repeat adjustment if necessary.