Witschi Electronic Ltd
Analyzer Q1
Page 13
6
RATE MEASUREMENT OF QUARTZ WATCHES
6.1
General Introduction
Signal Acquisition
The Analyzer Q1 is equipped with a single transducer for acoustic, capacitive and magnetic signal
acquisition. It allows checking watches with closed wristlet, open watches and movements.
If the watch is supplied from the Analyzer Q1, its rate deviation is derived from the supply current
(see chapter 9.2).
When the
SIGNAL
parameter is set to
Auto
, the instrument automatically selects the suitable signal
source according to the watch signal. You can also select manually another signal source.
Caution Due to the danger of faulty measurements in the case of watches with inhibition
compensation, this signal source
Quartz
is not selected automatically. To perform a
rate measurement through the quartz frequency, it is necessary to select manually the
Quartz
signal source with the
SIGNAL
parameter.
Additional information about the selection of the signal source is available in chapter 16.1
Measurement time
The measurement time for analogue watches must correspond to a pulse period of the stepping
motor or to a multiple thereof. Watches with inhibition compensation must be tested over an
inhibition period or a multiple thereof.
When the
TIME
parameter is set to
Auto,
the rate is first measured with the shortest possible
measurement time. If the rate deviation exceeds ± 0.5 s/d, the instrument “assumes” it is dealing
with an inhibition compensation watch. The measurement time is automatically set to 60s, a value
that matches most of the watches with inhibition compensation. If a shorter or longer inhibition
period is detected during measurement (e.g. 10 s or 120 s), the measurement time is modified
accordingly. Additional information about inhibition watches is available in chapter 16.2
The measurement time can be manually selected for special measurements.
6.2
Measurement Sequence
The watch is placed on the transducer and can be shifted to some extent if necessary until the signal
LED lights up strongly or blinks.
LCD watches must be positioned on the signal transducer with the dial face downward.
Measurement starts automatically from the main menu as soon as an exploitable signal is detected.
The instrument jumps to test mode
Rate and consumption test.
The suitable signal source (magnetic motor pulse, current pulse or LCD display frequency) is
automatically selected. The measurement time needed for measurement is also automatically
determined. It is only necessary to set up the instrument if measurement is to be deliberately carried
out with parameters other than those automatically selected (see chapter 17.2).
