Velociphile's Journey into Watches

Adhoc stuff about wristwatches. The technology of horology, escapements and patents to the industry and the market. Try me in Japanese or Chinese

Thursday, February 03, 2005

Understanding a JLC Master Control Test Report Printout

One of the best bits of the Master Control Test report is the following printout:

Column 1: Position.

VB = Vertical Bas (Crown Down)
VG = Vertical Gauche (Crown Left)
VH = Vertical Haut (Crown Up)
VD = Vertical Droit (Crown Right)
HH = Horizontal Haut (Dial Up)
HB = Horizontal Bas (Dial Down)

An ideal case is where a watch runs at the same rate irrespective of force feeding the escapement i.e. the power in the spring. So the testing in the 6 positions is carried out fully wound (0 h) and after 24 hours (24 h) .

Columns 2 and 3: Daily rate: The corresponding rates for each position you can see in columns 2 (0 h) and 3 (24 h).

Column 4: Difference in daily rate. Simply the difference between columns 2 and 3 (a low number would be good).

Columns 5 and 6: Beat Error. This is the number of milliseconds difference between the length of a tick and a tock. It's just a check of whether the watch is "in beat", i.e. with the balance wheel unfed with power, does it naturally rest in the middle of its swing? Column 5 (0 h) and column 6 (24 h)

Column 7 and 8: Balance Wheel Amplitude. You can clearly see the lower amplitude in the cases after 24 hours running (numbers like 267 deg dropping to 228 deg for example).

Delta: The maximum difference across any of the positions (in this example -1 to +3 gives a delta of 4 at 0h and +4 to -3 gives a delta of 7 at 24 h.

Val. m: is the average accuracy of the watch in every position rounded to one significant figure. It is the sums of column 2 and then column 3 respectively divided by 6.

Isochron max: The maximum difference in rate shown between 0 h and 24 h running in any of the positions.

"Qualit├Ąt N. = 2.5" is a result generated by the machine which is not used by JLC.


  • At February 04, 2005, Anonymous Anonymous said…

    Thanks for your explanation of a JLC Master Control report and the sample report you posted. Can you interpret the sample report...was the watch that was tested for the sample report a very accurate watch, average, or a not very accurate watch?

    Richard M

  • At February 04, 2005, Blogger Velociphile said…


    I honestly don't know, I've only ever seen four MC reports; another similar to this and a couple slightly poorer. May be best to post a question at the forum, but I think it's splitting hairs to categorise them.

    All JLCs seem to leave the factory inside the COSC "-1 to +6" spec as, anecdotally, most JLC owners seem to report something like 0 to +2 or 3s per day. Especially if kept fully wound on the wrist. That is also my own experience.


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