Owon TAO3000 Series User Manual page 30

(2) Select Coupling in the bottom menu.
(3) Select DC in the right menu. Both DC and AC components of the signal are
passed.
(4) Select AC in the right menu. The direct current component of the signal is
blocked.
2. To adjust the probe attenuation
For correct measurements, the attenuation coefficient settings in the operating
menu of the Channel should always match what is on the probe (see "How to Set
the Probe Attenuation Coefficient" on P11). If the attenuation coefficient of the
probe is 1:1, the menu setting of the input channel should be set to X1.
Take the Channel 1 as an example, the attenuation coefficient of the probe is
10:1, the operation steps are shown as follows:
(1) Push the CH1 button to show the CH1 SETUP menu.
(2) Select Probe in the bottom menu. Select Attenu in the right menu, select
10X in the left menu.
3. To measure current by probing the voltage drop across a resistor
Take the Channel 1 as an example, if you are measuring current by probing the
voltage drop across a 1Ω resistor, the operation steps are shown as follows:
(1) Push the CH1 button to show CH1 SETUP menu.
(2) Select Probe in the bottom menu. In the right menu, set MeasCurr as YES,
the A/V radio menu will appear below. Select it; Click
Amps/Volts ratio. Amps/Volts ratio = 1/Resistor value. Here the A/V radio
should be set to 1.
4. To invert a waveform
Waveform inverted: the displayed signal is turned 180 degrees against the
phase of the earth potential.
Taking the Channel 1 for example, the operation steps are shown as follows:
(1) Push the CH1 button to show the CH1 SETUP menu.
(2) Select Inverted in the bottom menu, switch to ON. the waveform is inverted.
Push again to switch to OFF, the waveform goes back to its original one.
5. To set bandwidth limit
When high frequency components of a waveform are not important to its
analysis, the bandwidth limit control can be used to reject frequencies above 20
MHz.
Taking the Channel 1 for example, the operation steps are shown as below:
(1) Push the CH1 button to show CH1 SETUP menu.
(2) Select Limit in the bottom menu.
4.Advanced User Guidebook
24
or to set the