Extech Instruments 380900 User Manual page 8

Dual Channel Voltage and Current Measurement
Warning: Both channels share the same ground. Voltage and current with different grounds cannot
be measured.
Note: The COM jack should be used as the CURRENT ground. The A jack should be used as the
VOLTAGE ground. The two grounds are connected internally by a fuse.
1. Set the Channel 1 voltage function: "VAC", "VDC", "mVAC", or "mVDC".
2. Set the Channel 2 current function: "ACA", "DCA", "ACmA", "DCmA", "ACµA", or "DCµA".
3. Insert the test leads into the input jacks.
4. Connect the test leads in PARALLEL to the voltage circuit to be measured, and connect the
test leads in SERIES with the current to be measured.
5. Read the voltage and current measurements on the display.
8 380900-EN v3.1 07/13