Fluke 43B Application Guide

Fluke 43B
Applications Manual
40
Checking Current and Current Imbalance
After checking voltage imbalance, check for current and current imbalance.
Unbalanced currents cause overheating and reduce motor life. Also single
phasing (complete loss of power on one of the phases feeding the motor) may
cause overheating in the two other phase windings.
1
Open the main menu.
2
3
Make connections as shown below. Run the motor at full load.
 If no current is present, you may assume an open fuse or winding.
 Write down the current reading (A
1
).
4
Repeat this measurement for phase 2 and phase 3. Write down the
values for A
2
and A
3
.
 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)