Testec 220 Instruction Manual page 34

AC/DC Oscilloscope Current Probes TT-CC Series
5. Adjust the oscilloscope's channel amplitude and time base settings as
necessary to get a clear and stable signal. Set the oscilloscope input to
DC volts to see both the AC and DC currents; set the channel to AC to
see the AC current only.
The current drawn by selected devices can vary. While the RMS current
can only be used in low frequency current, the transient peaks can be
quite high. Figure 3 shows the difference between a line current drawn by
a resistive load and a motor controller.
Resistive load
Motor controller
When connecting the current probe to a Digital Multimeter (DMM), use the
included BNC-to-banana adapter. Connect the black banana plug on the
adapter to the DMM's COM or ground jack and the red banana plug to the VΩ
jack.
To measure only AC current, set the meter to measure AC volts.
To measure DC current, set the meter to measure DC volts. Note the current
Figure 2: Connecting the current probe
Figure 3: Typical current waveforms
E-11 English