Circuit Test Function; Auto; Dc Voltage - Sealey TA500 Manual

7. Circuit Test function

This function is specially designed to diagnose the vehicle
electrical system, including DC or AC voltage test, continuity test,
and current test.
NOTE: Circuit Test function is only available when the tool is
powered by built-in 3.7V lithium battery solely. Otherwise, it will
cause incorrect results and damage the tool.
Use the UP/DOWN scroll button to select Circuit Test from Main
Menu in the scan tool, and press the OK button. (Figure 3.1)

The default mode is AUTO.

7.1 AUTO

While the tool in this mode, contact the probes to a circuit.
According to different circuit situations, the tool will select the
corresponding functions independently.
Circuit powered by DC mains
Circuit powered by AC mains

7.2 DC Voltage

While the tool in this mode, contact the probes to a circuit, then the
LCD display will read the DC voltage with a resolution of 0.02 volt.
Circuit situation
Reads off DC voltage
Reads off AC voltage
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Function