3M ScanEM-QC CTK019, Руководство пользователя

Страница: 14 / 36

14
3M
™
ScanEM-QC Electromagnetic Near-Field Probe amplifies the signal
instead of attenuating it, allowing viewing even of the weakest signal on the
screen.
The ScanEM-EQC Probe measures an electrical radiated field that is
a representation of the voltage in the circuit. The ScanEM-HQC Probe
measures a magnetic field in the cable that is a representation of the current
in that cable. You will be able to monitor high-frequency currents on a
signal or power trace without cutting the trace or spending hundreds or
thousands of dollars on a special current probe that only works at much
lower frequencies.
The ScanEM-QC Probe, as any field probe would, shows the signal slightly
differently than the one actually residing on the trace. This is due to an
antenna factor of the trace. Experimenting with the ScanEM-QC Probe and
the oscilloscope probe will show you the difference. Also, the ScanEM-QC
Probes pick the sum of the emissions from the adjacent traces and wires, so
some discretion is needed when assessing the signal on the screen.