Fluke 43B Application Guide

Motor Loads
Adjustable Speed Drives
4
53
Measuring Frequency of Motor Current
The frequency of the motor current correlates with motor speed.
1
Open the main menu.
2
3
Make connections as shown below:
 Vary the speed of the motor and look at the frequency and the waveshape
of the current. The frequency of the current should correlate with the
speed of the motor.
4 Repeat this measurement for phase 2 and phase 3.
Note
Because there is no voltage signal present, the frequency is
calculated from the current signal on input 2.
 VOLTS
/
AMPS
/
HERTZ



Fluke 43B Specifications

General

Category	Power Quality Analyzer
Interface	RS-232
Volts AC/DC	Yes
Ohms	Yes
Continuity	Yes
Diode Test	Yes
Capacitance	Yes
Harmonics Measurement	Up to 51st harmonic
Display	LCD
Battery Life	Approximately 6 hours
Weight	1.1 kg (2.4 lb)
Data Storage	Yes
Amps AC/DC	0.1 to 1000 A (with clamp)
Power Measurement	W, VA, VAR, PF
Dimensions	50 mm
Current Measurement Range	Via current clamp accessories (not built-in)