Measuring Ac Current - Extech Instruments MS420 User Manual

2. Press the F5 soft-key to select the 10A measurement mode, the unit of measure
on the main reading screen should be A.
3. Connect the red and black test leads to the measured points on the circuit under
test; The DC current value will be displayed on the screen.
4. Press the F4 soft-key to return to the mA measurement mode
Refer to the example in Figure 9.
Figure 9: 10A DC Current Measurement
M AC C
EASURING URRENT
To measure AC current lower than 400 mA, perform the following:
Insert the black lead into the COM banana jack input and the red lead into the mA
1.
banana jack input
Press the A key and then the use the SET key to select the ACA mode. The ACA
2.
symbol will appear at the top of the screen when selected
3. Use the F4 soft-key to select the mA mode
4. Connect the red and black leads to the measured points on the circuit under test;
The AC current value will be displayed on the screen.
Refer to the example in Figure 10.
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