FLUKE BT521 User Manual for the Fluke BT521 Advanced Battery Analyzer

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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 mΩ, Warning set to 20 %, Fail set to 50 %, and low limit set to 2.00 mΩ. The

comparison result is FAIL for resistance readings greater than 3.00 x (1 + 50 %) = 4.50

mΩ. It is PASS for resistance readings less than 3.00 x (1 + 20 %) = 3.60 mΩ. It is

WARN for resistance readings less than 4.50 mΩ but greater than 3.60 mΩ.

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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FLUKE BT521 Advanced Battery Analyzer