Dc Current Measurement; Ac Current Measurement; Resistance Measurement - Velleman DVM 890L User Manual

3.3 DC Current measurement

1) Connect the black test lead (-) to the COM input connector and the red test lead (+) to the mA
input connector or a maximum of 200mA. Move the red test lead to the 20A MAX input
connector for a maximum of 20A.
2) Set the FUNCTION switch to the A
3) Connect the test leads IN SERIES to the load under measurement.
4) Read LCD display. The polarity at the RED test lead connection will be indicated.
Note :
1) If the current range is unknown beforehand, set the FUNCTION switch to a high range and work
your way down.
2) The figure "1" on your display indicates overrange. This means the FUNCTION switch should be
set to a higher range.
3) The maximum input current is 200mA or 20A depending on the jack. Excessive current will
blow the fuse. The 20A range is not protected by a fuse. The fuse rating should not exceed
200mA in order to prevent damage to the internal circuitry.
4) The maximum terminal voltage drop is 200mV.
.

3.4 AC Current measurement

1) Connect the black test lead (-) to the COM input connector and the red test lead (+) to the 200mA
input connector for a maximum of 200mA.. Move the red test lead to the 20A input connector for
a maximum of 20A.
2) Set the FUNCTION switch to the A ∼ range.
3) Connect the test leads IN SERIES to the load being tested.
4) Read the LCD display.
Note :
1) If the current range is unknown beforehand, set the FUNCTION switch to a high range and work
your way down.
2) The figure "1" on your display indicates overrange. This means that the FUNCTION switch
should be set to a higher range.
3) The maximum input current is 200mA or 20A depending on the jack. Excessive current will
blow the fuse. The 20A range is not protected by a fuse. The fuse rating not exceed 200mA in
order to prevent damage to the internal circuitry.
4) The maximum terminal voltage drop is 200mV.

3.5 Resistance measurement

1) Connect the black lead (-) to the COM input connector and the red lead (+) to the V/Ω/f input
connector.
2) Set the FUNCTION switch to the appropriate Ω range and connect the test leads to the
resistance being tested.
DVM890L
range.
5 GB