1656 & 1657 Battery Element Tester Owner’s Manual
STS Instruments Page 22 of 88
7. Battery impedance is complex in nature and composed mainly of capacitive leakage
combined with resistive and inductive leakage. Because the open circuit reading on the
Quality Meter is ‘balanced’ to zero (0) against an internal load that is primarily inductive and
resistive, we do not assign a scalar value to the Quality meter reading. It is used to indicate a
change from this balance condition and to allow you to determine your product’s relative
impedance.
To determine your product’s relative impedance:
a. Adjust the test voltage to the desired level, e.g. 1500V.
b. Adjust the Lower Trip level to 10 and the upper trip level to 1000.
c. Test 10 to 12 known good battery cells.
d. Note down the Quality Meter reading of each.
For example:
You test 10 known good batteries and record readings of 650, 653, 680, 675, 701, 645,
665, 663, 688, and 660. Since your ‘average’ reading calculated to 668, you would set
your Trip Level limits for production test use to 668 ± 10% or larger 601 for low limit and
735 for high limit. (601 / 735).
Actual settings can be as “tight” as you like but, you should allow for normal product
variation and the effect of humidity on the moisture content of the plates. If you
perform your setup under low humidity conditions you would expect the readings to
slightly higher during high humidity conditions.
8. Apply the test probes to battery to be tested. The reject visual and audible signals operate if
quality meter is outside the trip level setting range. The reject signals cancel automatically
when the probes are lifted from the battery.
9. Even on good parts, a slight spark will be noticed when the tester probe is touched to the
part under test. This is normal, since charging current flows as a result of the inherent
capacity of the part under test.
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