BT521
Users Manual
3-12
How the Thresholds Work
When a threshold set is applied, the Product compares each resistance reading with the
resistance reference in the current threshold set.
•
If the reading is greater than reference x (1+Fail threshold) or less than the
resistance lower limit, the comparison result is FAIL, indicating that the tested battery
is potentially compromised and should be further investigated.
•
If the reading is greater than Reference x (1 + Warning threshold) but less than
Reference x (1 + Fail threshold), the comparison result is
WARN
, indicating that the
tested battery requires further attention and increase in test frequency.
•
If the reading is less than Reference (1+ Warning threshold), the comparison result is
PASS
, indicating that the tested battery is within the defined tolerance limits.
For example, you have applied a threshold set where
Resistance Reference
is set to
3.00 m
Ω
,
Warning
set to 20 %, Fail set to 50 %, and low limit set to 2.00 m
Ω
. The
comparison result is
FAIL
for resistance readings greater than 3.00 x (1 + 50 %) = 4.50
m
Ω
. It is
PASS
for resistance readings less than 3.00 x (1 + 20 %) = 3.60 m
Ω
. It is
WARN
for resistance readings less than 4.50 m
Ω
but greater than 3.60 m
Ω
.
At the same time, the Product compares each stable voltage reading with the lower
voltage from the applied threshold set. If the reading is less than the lower voltage
threshold, the comparison result is
FAIL
. If the reading is greater than the threshold, the
comparison result is
PASS
.
Note
If the resistance test and the voltage test have different results, the
Product shows the worse result on the display. For example, the
resistance indicates PASS but the voltage indicates FAIL, the
Product still shows FAIL on the display.
Measure Discharge Voltage
In a typical battery load discharge test, you need to test the voltage of each battery in a
battery string multiple rounds. In a typical load discharge test, the voltage of each battery
is monitored from the start of the test when the batteries are at full capacity, until the
voltage of any one battery while under constant load reaches a pre-defined minimum
voltage level.
Make Measurements
To test discharge voltage:
1. Push
M
as necessary to enter Sequence mode.
2. Turn the rotary switch to
Discharge VOLTS
.
Note
Discharge voltage can only be measured in Sequence mode.
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