Fluke 438-II Power Quality and Motor Analyzer

The Fluke 438-II allows you to evaluate the electrical and mechanical performance of electric motors and troubleshooting power quality—in a single tool.

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Overview

Electrical power quality and mechanical measurements in a single, easy-to-use test tool

The Fluke 438-II Power Quality and Motor Analyzer gives users the ability to measures power quality in detail while simultaneously performing key motor performance analysis including efficiency and shaft mechanical power measurements. You can quickly and easily discover the effect of power quality or loads on your motor performance and a direct readout of mechanical motor measurements allows you to correctly size the motor for current operating conditions or take actions to prevent failures.

  • Measure key parameters like speed, torque and mechanical power without mechanical sensors all while the motor is in service simply by using three-phase input measurements
  • Calculate Mechanical Power and Efficiency without the need of mechanical sensors
  • Automatically calculate motor derating according to NEMA/IEC guidelines

Features

The ideal portable motor analysis test tool, the 438-II can help locate, predict, prevent, and troubleshoot power quality problems in three-phase and single-phase power distribution systems, while giving technicians the mechanical and electrical information they need to effectively evaluate motor performance.

  • Measure key parameters like speed, torque and mechanical power without mechanical sensor all while the motor is in service simply by using three-phase input measurements
  • Calculate Mechanical Power and Efficiency without the need of mechanical sensors
  • Automatically calculate motor derating according to NEMA/IEC guidelines
  • Measure electrical power parameters such as voltage, current, power, apparent power, power factor, harmonic distortion and unbalance to identify characteristics that impact motor efficiency
  • PowerWave data technology captures fast RMS data, and shows half-cycle averages and waveforms to characterize electrical system dynamics (generator start-ups, UPS switching etc.)
  • Identify power quality issues such as dips, swells, transients, harmonics and unbalance
  • Waveform capture function captures 100/120 cycles (50/60 Hz) of each event detected event, in all modes, without set-up
  • Automatic transient mode captures waveform data at 200 kS/s on all phases simultaneously up to 6 kV
  • Fluke Connect® compatible* – view data locally on the instrument, via Fluke Connect mobile app and PowerLog 430-II desktop software
  • Highest safety rating in the industry: 600 V CAT IV/1000 V CAT III rated for use at the service entrance.
Fluke 438-II mechanical metering functions
Motor torque
Calculates the amount of rotational force (displayed in lb.ft or Nm) developed by a motor and transmitted to a driven mechanical load. The motor torque is the single most critical variable that characterizes the instantaneous mechanical performance of rotating equipment driven by electric motors.
Motor speed
Provides the instantaneous motor shaft rotational speed. Combined with the motor torque, motor speed provides a snapshot of the mechanical performance of rotating equipment driven by electric motors.
Motor mechanical load
Measures the actual mechanical power (displayed in hp or kW) produced by motors and provides a direct link to overloading conditions without simply basing it on the motor current.
Motor efficiency
Shows the effectiveness of each motor within a machine, assembly line, plant, and/or facility in converting electric power to useful mechanical work. By properly aggregating the efficiencies of a population of motors the total (aggregate) efficiency can be estimated. Comparisons to expected motor efficiencies at observed operating conditions can help quantify the cost associated with motor energy inefficiency.
How it works
Using proprietary algorithms, the Fluke 438-II Power Quality and Motor Analyzer uses three-phase current and voltage waveforms to calculate motor torque, speed, load and efficiency at a 1 second update rate. The motor air gap field, as observed via the voltage/current waveforms, provides the basis for the measurements. Mechanical sensors and intrusive no-load motor testing are not required, making it faster than ever to analyze overall electric motor performance.
Electrical motor analysis
The Fluke 438-II provides a complete breakdown of electrical parameters. Prior to beginning motor analysis, it’s recommended to make base line power quality measurements to assess the state of harmonics and unbalance on the electrical service output as these two properties can have a serious negative impact, on motor performance.

When in Motor Analysis mode, results are summarized for electrical performance, mechanical performance and derating (according to NEMA recommendations).

The easy to understand four-level color severity scale indicates motor performance in relation to the recommended electrical parameter levels including rated power, power factor, unbalance and harmonics.

screen view motor analyzer electrical
For mechanical power you can instantly view the mechanical output power along with motor torque and speed. The mechanical output power is instantly compared with electrical power to provide you with live efficiency measurements. With this feature you can easily measure machine performance during each operation cycle. screen view motor analyzer mechanical
The NEMA derating screen is updated as the load and the electrical conditions change, and each new measurement is plotted on the tolerance graph as a “+”. In this example we can see that motor is within tolerance but is close to the service factor. This indicates that there may be a need for power quality mitigation, motor maintenance or some other performance improving adjustment. By frequently performing these tests over time, known benchmarks and performance trends can be created, enabling informed maintenance investment decisions

Specifications

Motor measurement
Range                   Resolution Accuracy Default limit
Mechanical motor

Power

0.7 kW to 746 kW

1 hp to 1000 hp

0.1 kW

0.1 hp

±3%1

±3%1

100% = rated power

100% = rated power

Torque

0 Nm to 10 000 Nm

0 lb ft to 10 000 lb ft

0.1 Nm

0.1 lb ft

±5%1

±5%1

100% = rated torque

100% = rated torque

rpm 0 rpm to 3600 rpm 1 rpm ±3%1 100% = rated rpm
Efficiency 0% to 100% 0.10% ±3%1 NA
Unbalance (NEMA) 0% to 100% 0.10% ±0.15% 5%
Harmonics Voltage
Factor (NEMA)
0 to 0.20 0.1 ±1.5% 0.15
Unbalance Derating
Factor
0.7 to 1.0 0.1 indicative NA
Harmonics Derating
Factor
0.7 to 1.0 0.1 indicative NA
Total NEMA Derating
Factor
0.5 to 1.0 0.1 indicative NA
Notes: Supports motor design types NEMA A, B, C, D & E and IEC type H and N.
Rated torque is calculated from rated power and rated speed.
Update rate of Motor Measurements is 1x per second.
Default Trend duration is 1 week.
1Add 5% error when selecting Motor design type Other
Specification valid for Motor Power > 30% of rated power
Specification valid at stable operating temperature. Run the motor for at least 1 hour at full load
(2-3 hours if the motor is 50 HP or higher) to obtain stable temperature
Product Specifications
Volt Model Measurement Range Resolution Accuracy
Vrms (AC + DC) 1 V to 1000 V phase to neutral 0.01 V ±0.1% of nominal voltage1
Vpk 1 Vpk to 1400 Vpk 1 V 5% of nominal voltage
Voltage Crest Factor (CF) 1.0 > 2.8 0.01 ±5%
Vrms½ 0.1 V ±0.2% of nominal voltage
Vfund 0.1 V ±0.1% of nominal voltage
Amps (accuracy excluding clamp accuracy)
Amps (AC + DC) i430-Flex 1x  5 A to 6000 A 1 A ±0.5% ±5 counts
i430-Flex 10x 0.5 A to 600 A 0.1 A ±0.5% ±5 counts
1mV/A 1x 5 A to 2000 A 1A ±0.5% ±5 counts
1mV/A 10x 0.5 A A to 200 A (AC only) 0.1 A ±0.5% ±5 counts
Apk i430-Flex 8400 Apk 1 Arms ±5%
1mV/A 5500 Apk 1 Arms ±5%
A Crest Factor (CF) 1 to 10 0.01 ±5%
Amps½ i430-Flex 1x 5 A to 6000 A 1 A ±1% ±10 counts
i430-Flex 10x 0.5 A to 600 A 0.1 A ±1% ±10 counts
1mV/A 1x 5 A to 2000 A 1 A ±1% ±10 counts
1mV/A 10x 0.5 A A to 200 A (AC only) 0.1 A ±1% ±10 counts
Afund i430-Flex 1x 5 A to 6000 A 1 A ±0.5% ±5 counts
i430-Flex 10x 0.5 A to 600 A 0.1 A ±0.5% ±5 counts
1mV/A 1x 5 A to 2000 A 1 A ±0.5% ±5 counts
1mV/A 10x 0.5 A A to 200 A (AC only) 0.1 A ±0.5% ±5 counts
Hz
Fluke 434 @ 50 Hz Nominal 42.50 Hz to 57.50 Hz 0.01 Hz ±0.01 Hz
Fluke 434 @ 60 Hz Nominal 51.00 Hz to 69.00 Hz 0.01 Hz ±0.01 Hz
Power
Watts (VA, var) i430-Flex max 6000 MW 0.1 W to 1 MW ±1% ±10 counts
1 mV/A max 2000 MW 0.1 W to 1 MW ±1% ±10 counts
Power Factor (Cos j/DPF) 0 to 1 0.001 ±0.1% @ nominal load conditions
Energy
kWh (kVAh, kvarh) i430-Flex 10x Depends on clamp scaling and V nominal ±1% ±10 counts
Energy Loss i430-Flex 10x Depends on clamp scaling and V nominal ±1% ±10 counts Excluding line resistance accuracy
Harmonics
Harmonic Order (n) DC, 1 to 50 Grouping: Harmonic groups according to IEC 61000-4-7
Inter-Harmonic Order (n) OFF, 1 to 50 Grouping: Harmonic and Interharmonic subgroups according to IEC 61000-4-7
Volts % f 0.0% to 100% 0.1% ±0.1% ±n x 0.1%
r 0.0% to 100% 0.1% ±0.1% ±n x 0.4%
Absolute 0.0 to 1000 V 0.1 V ±5%1
THD 0.0% to 100% 0.1% ±2.5%
Amps % f 0.0% to 100% 0.1% ±0.1% ±n x 0.1%
r 0.0% to 100% 0.1% ±0.1% ±n x 0.4%
Absolute 0.0 to 600 A 0.1 A ±5% ±5 counts
THD 0.0% to 100% 0.1% ±2.5%
Watts % f or r 0.0% to 100% 0.1% ±n x 2%
Absolute Depends on clamp scaling and V nominal ±5% ±n x 2% ±10 counts
THD 0.0% to 100% 0.1% ±5%
Phase Angle -360° to +0° ±n x 1°
Flicker
Plt, Pst, Pst (1 min) Pinst 0.00 to 20.00 0.01 ±5%
Unbalance
Volts % 0.0% to 20.0% 0.1% ±0.1%
Amps % 0.0% to 20.0% 0.1% ±1%
Mains Signaling
Threshold Levels Threshold, limits and signaling duration is programable for two signaling frequencies
Signaling Frequency 60 Hz to 3000 Hz 0.1 Hz
Relative V % 0% to 100% 0.10% ±0.4%
Absolute V3s (3 second avg.) 0.0 V to 1000 V 0.1 V ±5% of nominal voltage
General Specifications
Case Design Rugged, shock proof with integrated protective holster Drip and dust proof IP51 according to IEC60529 when used in tilt stand position Shock and vibration Shock 30 g, vibration: 3 g sinusoid, random 0.03 g 2 /Hz according to MIL-PRF-28800F Class 2
Display Brightness: 200 cd/m 2 typ. using power adapter, 90 cd/m 2 typical using battery power Size: 127 x 88 mm (153 mm/6.0 in diagonal) LCD Resolution: 320 x 240 pixels Contrast and brightness: user-adjustable, temperature compensated
Memory 8GB SD card (SDHC compliant, FAT32 formatted) standard, upto 32 GB optionally Screen save and multiple data memories for storing data including recordings (dependent on memory size)
Real-Time Clock Time and date stamp for Trend mode, Transient display, System Monitor and event capture
Environmental
Operating Temperature 0°C ~ +40°C; +40°C ~ +50°C excl. battery
Storage Temperature -20°C ~ +60°C
Humidity +10°C ~ +30°C: 95% RH non-condensing
+30°C ~ +40°C: 75% RH non-condensing
+40°C ~ +50°C: 45% RH non-condensing
Maximum Operating Altitude Up to 2,000 m (6666 ft) for CAT IV 600 V, CAT III 1000 V
Up to 3,000 m (10,000 ft) for CAT III 600 V, CAT II 1000 V
Maximum storage altitude 12 km (40,000 ft)
Electro-Magnetic-Compatibility (EMC) EN 61326 (2005-12) for emission and immunity
Interfaces Mini-USB-B, Isolated USB port for PC connectivity SD card slot accessible behind instrument battery
1. ±5% if ≥ 1% of nominal voltage ±0.05% of nominal voltage if < 1% of nominal voltage
2. 50Hz/60Hz nominal frequency according to IEC 61000-4-30
3. 400Hz measurements are not supported for Flicker, Mains Signaling and Monitor Mode
4. For nominal voltage 50 V to 500 V

Models

Models (4)
Model Name Description
Fluke-438-II Fluke 438-II Power Quality and Motor Analyzer
Fluke-438-II/Basic Fluke 438-II Power Quality and Motor Analyzer/Basic
Fluke-438-II/INTL Fluke 438-II Power Quality and Motor Analyzer/INTL
Fluke-438-II/MA Fluke 438-II Power Quality and Motor Analyzer/MA

Accessories

Batteries, Chargers & Adapters (3)
Model Name Description
Fluke BC430 Fluke BC430 Line Voltage Adapter/Battery Charger
Fluke BP291 Fluke BP291 4800 mAh High Capacity Li-Ion Battery for Fluke 190-Series-II
Fluke EBC290 Fluke EBC290 External Battery Charger for BP290 and BP291
Cases & Holsters (1)
Model Name Description
Fluke C435 Fluke C435 Hard Rolling Case
Clips (1)
Model Name Description
Fluke AC285 Fluke AC285 SureGripTM Alligator Clips
Current Clamps (7)
Model Name Description
Fluke i30s Fluke i30s AC/DC Current Clamp
Fluke-i310s Fluke i310s Current Probe
Fluke i400s Fluke i400s AC Current Clamp
Fluke i430 Fluke i430 Flex 4 Pack
Fluke i5S Fluke i5S AC Current Clamp
Fluke i5sPQ3 Fluke i5sPQ3, 5 A AC Current Clamps, 3-pack
Fluke-i6000s Flex Fluke i6000sFlex AC Current Probe
Options (1)
Model Name Description
Fluke HH290 Fluke HH290 Hanging Hook for ScopeMeter 190-Series II

Knowledge

Manuals
Title
438-II Users Manual Download
438-II Users Manual Download
438-II Users Manual Download
438-II Users Manual Download
438-II Users Manual Download
438-II Users Manual Download
438-II Users Manual Download
438-II Users Manual Download
438-II Users Manual Download
438-II Users Manual Download
438-II Users Manual Download
438-II Users Manual Download
Application Notes (2)
Title
Electric motor efficiency and reliability: New testing approach matches real world conditions Download
Why you should add motor analysis to your maintenance routine Electric Download