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Analyzer Q1
Witschi Electronic Ltd
12.3
Result Display
The measured resistance value is displayed in numerical form.
If there is no conducting path between the measuring points,
open
is displayed.
Short
is displayed, if a short circuit is detected.
In addition, the
step motor
LED lights up when a conducting path is detected.
Typical Values
The coil resistance of analogue watches lies between 1 and 2 k
Ω
. For exact values, kindly refer to
technical data for the watch module
Open
is displayed when there is a break in the coil. A shorted coil leads to too small a measured
resistance value.
When testing the insulation between coil and plate, the instrument should display
open
or a value
greater than 1 M
Ω
.
13
TEST OF STEP MOTORS WITH THE SIGNAL GENERATOR
13.1
Field of Application
The step motor and the mechanical part of a quartz analogue watch can be tested with the signal
generator independently of the electronic circuit.
The step motor can be accelerated for detecting quickly mechanical faults such as hands catching
each other or problems with the change of date.
13.2
Procedure
It is necessary to remove the battery from the watch to test the step motor.
-
Select the
Signal generator
function in the main menu.
Select the
Motor
mode
-
Select the pulse width (
WIDTH
)
and the chopping level (
PULSE
) according to the data needed for
testing the watch.
For an acceleration test, select the 16 Hz pulse frequency under
FREQ
.
