Triplett 9007-A - Manual (Page 27)

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measurement resolution can be obtained.
7.4 AC Voltage Measurement:
WARNING!
If the magnitude of the voltage to be measured is unknown, always
start by setting the meter to the highest range, and then to lower
ranges, until a satisfactory reading is obtained.
Do not rotate the RANGE switch with the input applied to the meter.
If the input voltage is higher than 600VAC (CAT I, CAT II, CAT III), or
600VAC (CAT III), do not attempt to measure!
Use Caution when measuring voltages above 30V AC.
7.4.1 Connect the black test lead to the COM jack and the
red test lead to the input jack indicated as on the
“Front Panel” drawing on page 22.
7.4.2 Set the RANGE switch to a V~ position. If the magnitude
of voltage is unknown, set the RANGE switch to the
highest V~ position. If the input voltage is higher than
the previously stated limits, do not attempt to measure!
7.4.3 Connect the test probes to circuit being measured.
The LCD will display the AC voltage.