Seiko 4T57A Technical Manual & Parts Catalogue page 8

TECHNICAL GUIDE
REMARKS ON INSPECTION AND MEASUREMENT
● How to measure the current consumption for the whole movement
1. To measure the current consumption for the whole move-
ment, connect the (-) probe to the battery connection (-)
and (+) probe to the other metal part of the movement,
such as battery clamp or circuit block cover.
* When measuring the current consumption using the SEIKO
digital multi-tester (S-860), use the range of 40 μ A of SUP-
ply v (= 1.55 v) & gATE TImE (2 S).
2. Connect the AC component to the positive terminal for 2
seconds until a short circuit occurs to reset the integrated
circuit.
3. After the integrated circuit is reset, wait approximately for
10 seconds until a stable measurement is obtained, and
then read the measurement.
4. Make sure the read value is less than 2.2 μ A.
● How to measure the current consumption for the CIRCUIT BLOCK alone
1. To measure the current consumption for the CIRCUIT BLOCK
alone, connect each probe to the appropriate positive (+) or
negative (-) input terminal of the CIRCUIT BLOCK (please re-
fer to "Structure of the CIRCUIT BLOCK" below).
* When measuring the current consumption using the SEIKO
Multi-Tester S-860, use the range of 4 μ A of SUPPLy V (= 1.55
v) & gATE TImE (2 S).
2. Repeat the same procedures as 2. and 3. of measuring cur-
rent consumption for the whole movement above.
* When measuring the current consumption for the circuit
block alone, be careful not to damage or deform the pattern
of the circuit block.
3. Make sure the read value is less than 1.04 μ A.
8/11
Cal. 4T57A