Appendix 6. Use Bt5300 To Measure Internal Resistance, Open-Voltage, And Enclosure Potential; Measuring With Front Panel Input Terminals - Fluke BT5300 Series User Manual

Appendix 6. Use BT5300 to Measure Internal Resistance, Open-Voltage, and
Enclosure Potential
With the increasing requirements for cell testing, in addition to measure the internal resistance (AC-
IR) and open circuit voltage (OCV) of the cell, it is also necessary to test the enclosure potential. In a
typical OCV test bench, there are up to three instruments to complete the test:

Battery tester: internal resistance measurement

7.5-digit DMM: open-circuit voltage measurement

6.5-digit DMM: enclosure potential measurement
The BT5300 Series integrates a 6.5- or 7.5-digit voltmeter with high-z (>10 GΩ) inputs, a single
instrument can complete these tests. The following takes the BT5321 as an example to introduce how
to complete these tests through the input terminals on the front panel or built-in Multiplexer Card(s).

Measuring with Front Panel Input Terminals

Figure 58. Measuring ACR, DCV and enclosure potential - front panel
Connect the front panel input terminals of the BT5321 to the switching circuit, and switch between
different measurement functions through the relays in the switching circuit. The following is a
schematic diagram of the switching circuit.
Battery Tester
Appendix
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