Measuring Dc Current - Extech Instruments MS420 User Manual

M DC C
EASURING URRENT
To measure a DC current lower than 400 mA, do the following:
1. Insert the black lead into the COM banana jack input and the red lead into the
mA banana jack input
Use the A key and the SET key as needed to select the DCA mode (the DCA
2.
symbol will appear at the top of the screen
3. Ensure that the displayed unit of measure on the main reading screen is mA.
Use the F4 soft-key to select mA if necessary.
4. Connect the red and black leads to the measured points on the circuit under test;
the DC current value will be displayed on the screen.
Refer to the example diagram in Figure 8.
Figure 8: 400mA DC Current Measurement
To measure a DC current larger than 400 mA, perform the following:
Press the A key and the DCA symbol should appear at the top of the screen.
1.
Use the SET key to select DCA if necessary.
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