MS400 datasheet(28/51 Pages) EXTECH

28 / 51 page

MS400 Version 2.0 – December 2007

Making a DC Current Measurement

To measure DC current less than 400 mA:

1. Press the A key and DCA appears at the top

of the screen. The units on the main reading

screen are mA and 20A, press F4 or F5 to

switch the measurement between mA and

20A

2. Insert the black lead into the COM banana

jack input and the red lead into the mA

banana jack input.

3. Connect the red and black test leads in

series to the measurement points and the

DC current value will be displayed on the

screen.

Figure 27: DC Current Measurement.

To measure DC current larger than 400mA:

1. Press the A key and DCA appears at the

top of the screen. The units on the main

reading screen will be mA.

2. Press F5 to change to the 20A

measurement mode, the units on the main

reading screen will be A.

3. Plug the 20A current shunt into the current

measure jack, and then plug the probe in

the module.

4. Connect the red and black test leads in

series to the measurement points and the

DC current value will be displayed on the

screen.

5. Press F4 to return to the 400mA

measurement mode.

Figure 28: DC Current Measurement.

Making an AC Current Measurement

To measure AC current less than 400mA:

1. Press the A key and DCA appears at the top

of the screen. The units on the main reading

screen are mA and 20A, press F4 or F5 to

switch the measurement between mA and

20A

2. Press the AUTO SET key once and ACA will

be visible at the top of the screen.

3. Insert the black lead into the COM banana

jack input and the red lead into the mA

banana jack input.

4. Connect the red and black test leads to the

measurement point and the AC current value

will be displayed on the screen.

Figure 29: AC Current Measurement

MS400 Datasheet(PDF) 28 Page - Extech Instruments Corporation.

MS400 Datasheet(HTML) 28 Page - Extech Instruments Corporation.

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