Special Parameter Settings / Timing Key - Omega CALIBRE 2628 Technical Manual

Instrument type
Former Witschi instruments
- Watch Expert (red case)
- Wicometer Professional
- Chronoscope M1 (old version)
New Witschi instruments
- Watch Expert II (white case)
- Chronoscope M1 (up-dated version)
- Chronoscope S1
Fig. 5.0
Fig. 5.1
REF. 506 0042
Fig. 5.2
OMEGA SA
Specifi c information for Calibre 2628
Demagnetise the movement according to Working
Instruction 34.
Values to be checked
Please consult Working Instructions 5 and 28 for
instructions and tolerances.
Special parameter settings
Co-Axial
4 Hz calibres 3.5 Hz calibres
Lift angle Lift angle
set to 30° set to 38°
The amplitude
All measurements
is not measured
are correct
Lift angle Lift angle
set to 38° set to 38°
All measurements All measurements
are correct are correct
5.0 Timing key
A special timing key tool has been developed to adjust
the rate even when the movement is cased in. The rate
can be corrected according to the table below by turning
the two balance screws a complete turn. A scale is found
on the outside of the tool. A division corresponds to a rate
correction of 1 second. (according to the table below).
One screw is located between two arms on the balance
which are specially marked by points (see Figure 5.2) for
easy identification of each screw during the correction
process.
Balance
The annular balance has two adjusting micro-screws. A
slow rate deviation is corrected by tightening the micro-
screws (towards the centre of the balance), which redu-
ces its moment of inertia and makes it run faster. A fast
rate deviation is corrected by loosening the micro-screws
(away from the centre of the balance). This increases its
moment of inertia and makes it run slower.
Important:
The rate is always corrected using both adjustment
screws to prevent an unbalance of the balance.
Version A
One correction turn = 57 seconds
One division = 1 second
WORLD SERVICE ORGANIZATION
Co-Axial
Comments
3.5 Hz calibres:
The frequency parameters
(25'200 A/h) should be
set manually so that the
instantaneous rate is
correctly
Test mode:
Parameters must be set
for «Spe1»!
One correction turn = 86 seconds
One division = 1.5 seconds
GT-19-C-006-E - D - 2628
Version B
/18