Fluke 43B Application Guide

Receptacle Branch Circuits
Measuring Current Harmonics
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 Look at the harmonics spectrum screen. Check the spectrum for severe
harmonics.
 Read the THD. It indicates the harmonic distortion on the current signal.
Usually, the current signal can tolerate more harmonics than the voltage
signal.
Tip
Measure harmonic currents at the point of common coupling to check
whether the THD and individual harmonics comply with national
standards (like IEEE-519). It is incorrect to apply such standards to
specific loads.
Zero-sequence harmonics (3rd, 9th, 15th, ...) add in neutral
conductors or bus bars. This can cause overheating in neutral wires.
By measuring current harmonics at several places in a distribution
system, you can track the harmonic source. The closer you get to the
source, the more severe the current THD will be.
With FlukeView
®
software you can record Harmonics over time and
export data to popular spreadsheet programs such as Excel.

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)