Power-Measurement Application Examples
2–50
THS710A, THS720A, THS730A & THS720P User Manual
Triggering at a Specific Motor RPM
You need to measure the start-up current of a 3600-RPM motor at
several specific speeds. A tachometer, attached to the motor,
outputs a low-voltage square wave with 100 pulses per revolution.
Set up the TekScope instrument to trigger at 1200 RPM so you can
measure the current at that speed.
Ch 1 Ch 2
Tachometer output frequency
1200 revmin 100 pulsesrev
60 smin
2 kHz
Tachometer pulse width
period
2
1
2 kHz
2
250 s
Electric motor with
attached tachometer
Tachometer signal (Ch 1)
Motor current (Ch 2)
@: 12.8 A
100 mV/A
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