Reference Notes
AC and DC Coupl
ing
You can couple the signal input to the TCPA300 and TCPA400 with either DC
or AC coupling. DC coupling shows the DC and AC measurement components
while AC coup
ling removes the DC component from the displayed signal. When
you use AC coupling, make sure that the input DC c urrent does not exceed the
probe specifications.
AC coupling will affect waveforms at frequencies higher than the AC Coupling
Low-Frequency Bandwidth. For example, pulsed currents may exhibit rolloff or
decreased amplitude. (See F igure 13.)
1. A low-frequency square wave using AC coupling. The signal exhibits
low-frequency rolloff.
2. By changing the amplifier coupling to DC, the pulse is displayed as truly
square, as shown.
Figur
e 13: Effect of AC or DC coupling on low-frequency signals
If yo
u are trying to examine a low-frequency signal that is superimposed on a
comparatively large DC component, you can resolve the signal by performing
these steps:
1. Select the range setting that w ill display the maximum detail without
exceeding the dynamic range of the signal.
2. Adjust the o scilloscope V/div sens itivity (A/div if using the TEKPROBE
interface), to display maximum signal detail.
26 TCPA300/400 Amplifiers and TCP300A/400 Series Current Probes User Manual
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