11
TECHNICAL GUIDE
Cal. YT57B
2.
Apply the minus terminal to “a” portion of the
input terminal (–) in the illustration and plus
terminal to the circuit block cover, respectively.
“a” portion
Circuit block cover
Note: When moving the oscillating weight
from side to side, take care lest the
minus terminal of the tester touches the
oscillating weight.
3.
For a few seconds after the probes of the tester
are applied to the movement, the IC is in the
quick start mode, and current consumption
cannot be measured properly. To switch the IC
from the quick start to the normal hand
movement mode, move the oscillating weight
from side to side continuously for more than
three seconds with the tester connected to the
movement. The IC will detect the electricity
generation and will be switched to the normal
hand movement mode.
4.
After checking that the IC has been switched to the normal hand movement mode and a stable
measurement can be obtained, read the measurement.
If the measurement value remains high or unstable, repeat step “3” above.
Notes:
* Light may increase the current consumption, resulting in an inaccurate measurement. If the current
consumption exceeds the standard value, protect the movement from light with a black cloth or the
like, and make a measurement again.
* When the current consumption for the whole movement exceeds the standard value while the current
consumption for the circuit block alone is within the standard value range, a driving pulse may be
generated to compensate for the heavy load applied on the gear train, etc. In that case, overhaul and
clean the movement parts, and then, measure the current consumption for the whole movement again.
1.
Connect the tester to the
circuit block as shown in the
illustration.
How to measure the current consumption for the circuit block alone
“A” portion
