Measuring Voltage; Measuring Current; Measuring Frequency - Velleman DVM98 Manual

3. Operating Instruction

3.1 Measuring voltage

1. Connect the black test lead to the COM jack and the red test lead to the V Ω
Hz jack.
2. Set the rotary switch at the desired V
test leads across the source or load under measurement. The polarity of the
red lead connection will be indicated along with the voltage value when
making DC voltage measurement.
3. When only the figure "1" is displayed, it indicates over range situation and
the higher range has to be selected.

3.2 Measuring current

1. Connect the black test lead to the COM jack and the red test lead to the mA
jack for a maximum of 200mA current. For a maximum of 20A, move the
red lead to the A jack.
2. Set the rotary switch at desired A
leads in series with the load under measurement. The polarity of the red lead
connection will be indicated along with the current value when making DC
current measurement.
3. When only the figure "1" displayed, it indicates over range situation and the
higher range has to be selected.

3.3 Measuring frequency

1. Connect the black test lead to the COM jack and the red test lead to the V Ω
Hz jack.
2. Set the rotary switch at 20kHz position and connect test leads across the
source or load under measurement.
NOTE :
1. Reading is possible at input voltages above 10Vrms, but the accuracy is
not guaranteed.
2. In noisy environment, it is preferable to use shields cable for measuring
small signal.
or V range position and connect
or A range position and connect test