Witschi Electronic Ltd Analyzer Q1 Page 17
9.2 Current Measurement
9.2.1 General Introduction
The current consumption of a quartz watch constitutes an important quality criterion and indicates
the expected lifetime of the battery.
The current of analogue quartz watches is composed of the IC current and of the current spikes
associated with motor pulses. The instrument IC captures the value of the IC current as well as the
value of the overall average current during the measurement time (integrating measurement).
9.2.2 Selection of the Supply Voltage
For performing current and rate measurements through the supply current, select the nominal
voltage according to the battery type.
The nominal voltage of the most widely used silver oxide batteries is equal to 1.55 V. This value is
automatically selected when the measurement function is started.
Most of the less frequently used lithium batteries have a nominal voltage of 3 V.
When the
VOLT
parameter is selected, the supply power can be adjusted with the rotary knob in the
range from 0 to 3.5 V.
9.2.3 Functionality of the “variable Trigger”
Applicable for the rate- and current measurement over the motor pulses b external power supply of the
watch.
Especially for thermo-compensated quartz watches or quartz movements with measuring times of 480
and 960 seconds.
An accurate rate- and current measurement with external power supply over the magnetic pulse
requires a trouble-free motor pulse signal (
Menu Motor
).The variable trigger (
spike
filter) should
ignore/filter out interfering inhibition signals.This is mainly the case for quartz watches with
temperature compensation (measuring time 480 / 960 seconds).
Analyzer Q1/Twin controls the
spike
filter function by a variable supply voltage of 1.55V to 3.50V
Graphical representation of the trigger (spike-filter) operation:
Graphical representation of the trigger (spike-filter) operation:
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