Witschi Electronic Ltd
Analyzer Q1
Page 19
operation of the
End Of Life
(
EOL
) function can also be tested by decreasing the voltage (see chapter
16.6).
Please note: Various voltage-dependent functions of the watch, such as
Asservissement
or
End of
Life,
react to change in voltage with a delay of up to 4 minutes.
The supplied voltage is decreased by steps, while observing the hands of the watch in the mirror
until the watch stops, and then slowly increased once more until it runs again.
The
VOLT
parameter reacts immediately to any change, i.e. without acknowledgment by pressing
the rotary knob. Pressing the rotary knob is only necessary when exiting from the parameter.
It is usually enough to test the correct operation of the watch with a reduced supply voltage. The
minimum operating voltage of watches with a silver oxide battery is equal to 1.2 V in most cases.
9.4
Watch Acceleration
Many watch modules are equipped with a test point (mostly designated by R/T) accessible on the
electronic module. The acceleration and reset functions can be activated with this test point. This
can be achieved by using the probe tip to establish a contact with the test point in addition to the
supply with contact probes. With most movements, establishing a contact with the +terminal
activates
Reset
(the motor pulses are disabled) while establishing a contact with the –terminal
activates the acceleration.
For additional information, kindly refer to technical information for this particular movement.
In accelerated mode, the watch performs 16 or 32 steps per second. The motion of the hands can be
observed in the mirror and mechanical problems, e.g. due to hands touching or to the change of
date can be identified quickly.
10
BATTERY TESTING
10.1
Connecting Points
Place the + side of the battery to be tested on the contact surface of the
battery
support and establish
the contact with the – side using the black contact probe or the black probe tip.
In most cases, the battery can also be directly tested in the open watch by means of the probe tips.
Pay attention to the polarity of the battery when testing it.
-
In the case of a standard silver oxide battery, the case corresponds to the + terminal and the case
cover to the – terminal.
-
In the case of batteries for large-sized watches, the case corresponds to the – terminal and the
contact on the case cover to the + terminal.
-
Lithium batteries are available in different executions. Check the indications on the battery (+ or –
sign) or the indications from the manufacturer.
10.2
Test Sequence
In automatic test mode, the instrument automatically detects that a battery has been connected
and switches to the
Battery test
mode. The
Battery test
mode can also be selected manually.
The voltage with a minimal load demand (
No Load
) is continuously measured and displayed.
A load of 2 k
Ω
is switched on once per second for 10ms; it simulates the step motor. The voltage
associated to this load (
Low Drain
)
is continuously determined and displayed.
