Reference Notes
Increasing Se
nsitivity
If you are measuring DC or low-frequency AC s ignals of very small amplitudes,
you can increase measurement sensitivity of your Current Probe by winding
several turn
s of the conductor under test around the probe as shown. The signal is
multiplied by the number of turns around the probe.
WARNING. To avoid injury or loss of life, do not put more than one uninsulated
conductor at a time in the probe jaws. An uninsulated conductor is defined as any
conductor without insulation or without insulation rated for the voltage present
on the conductor under test.
When viewing the signal on the oscilloscope screen, divide the displayed
amplitude by the number of turns to obtain the actual c urrent value. For example,
if a conductor is wrapped a round the probe five times and the oscilloscope shows
a reading of 5 mA DC, the actual current flow is 5 mA divided by 5, or 1 mA DC.
NOTE. Winding multiple turns around the probe increases insertion impedance
and re
duces the upper bandwidth limit of the probe.
Figure 18: Increasing probe sensitivity
34 TCPA300/400 Amplifiers and TCP300A/400 Series Current Probes User Manual
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