Measuring System Voltage; Battery Charge Voltages - Fluke 88 V User Manual

Model 88 V
Users Manual

Measuring System Voltage

Bleed the surface charge from the battery by turning the
headlights on for 1 minute. Measure the voltage across the
battery terminal with the lights off. When possible,
individual cell specific gravity should be checked with a
hydrometer. A load test should be done to indicate battery
performance under load. Voltage tests only tell the state of
charge, not the battery condition. To measure system
voltage:
1. Insert test leads in the input terminals shown in Figure
18.
V
2. Set the switch to .
3. Turn on lights for 1 minute to bleed off surface charge.
4. Turn lights off and touch probes to circuit.
5. Read the display. A fully charged battery typically
shows about 12.6 V. See other typical values in Table
9.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
54
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Table 9. Battery Charge Voltages
Voltage
12.60 to 12.72 V
12.45 V
12.30 V
12.15 V
Readings obtained at 80 °F (27 °C)
% Charge
100
75
50
25