Triplett 9007-A - Manual (Page 31)

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7.6 AC Current Measurement:
WARNING!
If the magnitude of the current 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 current is higher than 10A, do not attempt to measure!
Use caution when measuring current in a circuit with voltages
above 30 VAC. Do not use meter to measure current in circuits
whose voltage exceeds 250V AC/DC.
7.6.1 Connect the black test lead to the COM jack. Connect
the red test lead to the 10A jack unless it is known that
the input current is less than 200mA. If the current is
less than 200mA, connect the red test lead to the uA
mA jack.
7.6.2 If the red test lead is inserted into the 10A jack, set the
RANGE switch to the 10A~ position. Connect the test
leads IN SERIES with the circuit to be measured. Read
the value of the current on the LCD display.