User manual

DVM890L GB 4
3. Operating instructions
1) Check the 9V battery by setting the ON-OFF switch to the ON position. If the battery is weak, a
" " sign will appear on the display.
If this sign does not appear on the display, proceed as mentioned below. Read MAINTENANCE
if the battery has to be replaced.
2) The sign next to the test lead jacks warns you of the fact that the input voltage or current
should not exceed the indicated values.
This serves to prevent the internal circuitry from damage.
3) The function switch should be set to the desired range before use.
3.1 DC Voltage measurement
1) Connect the black lead (-) to the COM input connector and the red lead (+) to the V/Ω input
connector.
2) Set the FUNCTION switch to the V range to be used and connect the test leads to the source
or load being tested.
3) The polarity of the RED lead connection will be indicated on the LCD display.
Note :
1) If the voltage 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) Do no apply more than 1000V to the input. Higher voltages can be applied BUT may very
well damage the internal circuitry.
4) Use extreme caution to avoid contact with high tension circuits when measuring sources of high
voltage.
3.2 AC Voltage 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 V∼ range and connect the test leads to the source
or load being tested.
3) Read the LCD display.
Note :
1) See DC voltage measurement.
2) Do not apply more than 700Vrms to the input. . Higher voltages can be applied BUT may
very well damage the internal circuitry.
4) Use extreme caution to avoid contact with high tension circuits when measuring sources of high
voltage.