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Users Manual
INPUT B is automatically detected during the Auto Set and
since it has a lower frequency than INPUT A, it is chosen
as the trigger signal. This technique can be used for PWM
(Pulse Width Modulated) motor drives where the power line
signal can be used (see Figure 8-11).
WARNING
MEASURING ON PWM MOTOR DRIVES CAN CREATE
A POTENTIAL SHOCK HAZARD.
•
ENSURE THAT THE MOTOR IS OFF BEFORE YOU
CONNECT OR DISCONNECT PROBES OR TEST
LEADS.
•
USE ONLY INSULATED PROBES, TEST LEADS,
AND CONNECTORS SPECIFIED IN THIS MANUAL
WHEN MAKING MEASUREMENTS >42V PEAK (30V
RMS) ABOVE EARTH GROUND OR IN CIRCUITS
>4800 VA.
•
USE PROBES AND TEST LEADS WITHIN RATINGS
AND INSPECT BEFORE USE.
Figure 8-11 PWM Motor Drive Signals