Quickly and easily discover electrical and mechanical performance of electric motors, and evaluate power quality with a single test tool

The Fluke 438-II Power Quality and Motor Analyzer adds key mechanical measurement capabilities for electric motors to the advanced power quality analysis functions of the Fluke 430 Series II Power Quality Analyzers. Quickly and easily measure and analyze key electrical and mechanical performance parameters such as power, harmonics, unbalance, motor speed, torque and mechanical power without the need of mechanical sensors. Fluke 434-II, 435-II and 437-II Power Quality Analyzer users can add motor analysis capabilities to their existing units with the Fluke-438-II/MA Motor Analyzer upgrade kit.

 

Drive Measurement Details
Motor Type 3 phase asynchronous (induction)
Power Source Variable Frequency Drive
Motor Frequency Range 40Hz to 70Hz
Over/Under Voltage from Nominal V/f Curve (%) -15% to +15%
Carrier Frequency Range 2.5kHz–20kHz
Variable speed drive technology that is covered by the 438-II
Inverter Type VSI only (voltage controlled) *
Control Method V/f control, open-loop vector, closed loop vector, drives with encoders.
Frequency 40 to 70 Hz
* VSI drives are the most common drives. The alternative CSI drives are used in higher power applications.
Variable speed drive technology NOT covered by the 438-II
Inverter Type CSI (current source inverter)
Motors type Non-synchronous (DC, stepper, permanent magnet etc.)
Motor Frequency <40 and >70 Hz
Mechanical specifications
Mechanical measurements can be performed on direct online motors with a 3 wire connection.
Range Resolution Accuracy Default limit
Motor measurement
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 – ±1.5% 0.15
Unbalance Derating*
Factor		 0.7 to 1.0 – indicative NA
Harmonics Derating*
Factor		 0.7 to 1.0 – indicative NA
Total NEMA Derating*
Factor		 0.5 to 1.0 – indicative NA
* Derating factors do not apply to motors powered by variable frequency drives.
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
Electrical specifications
Model Measurement range Resolution Accuracy
Volt
Vrms (ac+dc) 435-II 1 V to 1000 V phase to neutral 0.01 V ±0.1% of nominal voltage****
Vpk – 1 Vpk to 1400 Vpk 1 V 5% of nominal voltage
Voltage Crest Factor (CF) – 1.0 > 2.8 0.01 ±5%
Vrms½ 435-II 0.1 V ±0.2% of nominal voltage
Vfund 435-II 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 1A ±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 1A ±0.5% ±5 counts
1mV/A 10x 0.5 A A to 200 A (ac only) 0.1 A ±0.5% ±5 counts
Hertz
Hz Fluke 435 @ 50 Hz nominal 42.500 Hz to 57.500 Hz 0.001 Hz ±0.01 Hz
Fluke 435 @ 60 Hz nominal 51.000 Hz to 69.000 Hz 0.001 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% *
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° 1° ±n x 1°
Flicker
Plt, Pst, Pst(1min) 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 mm 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 32GB 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
Warranty Three years (parts and labor) on main instrument, one year on accessories

* ±5% if ≥ 1 % of nominal voltage ±0.05% of nominal voltage if < 1% of nominal voltage
** 50Hz/60Hz nominal frequency according to IEC 61000-4-30
*** 400Hz measurements are not supported for Flicker, Mains Signaling and Monitor Mode.
**** for nominal voltage 50 V to 500 V.


Fluke 438-II Power Quality and Motor Analyzer

Quickly and easily discover electrical and mechanical performance of electric motors, and evaluate power quality with a single test tool

The Fluke 438-II Power Quality and Motor Analyzer adds key mechanical measurement capabilities for electric motors to the advanced power quality analysis functions of the Fluke 430 Series II Power Quality Analyzers. Quickly and easily measure and analyze key electrical and mechanical performance parameters such as power, harmonics, unbalance, motor speed, torque and mechanical power without the need of mechanical sensors. Fluke 434-II, 435-II and 437-II Power Quality Analyzer users can add motor analysis capabilities to their existing units with the Fluke-438-II/MA Motor Analyzer upgrade kit.

 

Drive Measurement Details
Motor Type 3 phase asynchronous (induction)
Power Source Variable Frequency Drive
Motor Frequency Range 40Hz to 70Hz
Over/Under Voltage from Nominal V/f Curve (%) -15% to +15%
Carrier Frequency Range 2.5kHz–20kHz
Variable speed drive technology that is covered by the 438-II
Inverter Type VSI only (voltage controlled) *
Control Method V/f control, open-loop vector, closed loop vector, drives with encoders.
Frequency 40 to 70 Hz
* VSI drives are the most common drives. The alternative CSI drives are used in higher power applications.
Variable speed drive technology NOT covered by the 438-II
Inverter Type CSI (current source inverter)
Motors type Non-synchronous (DC, stepper, permanent magnet etc.)
Motor Frequency <40 and >70 Hz
Mechanical specifications
Mechanical measurements can be performed on direct online motors with a 3 wire connection.
Range Resolution Accuracy Default limit
Motor measurement
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 – ±1.5% 0.15
Unbalance Derating*
Factor		 0.7 to 1.0 – indicative NA
Harmonics Derating*
Factor		 0.7 to 1.0 – indicative NA
Total NEMA Derating*
Factor		 0.5 to 1.0 – indicative NA
* Derating factors do not apply to motors powered by variable frequency drives.
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
Electrical specifications
Model Measurement range Resolution Accuracy
Volt
Vrms (ac+dc) 435-II 1 V to 1000 V phase to neutral 0.01 V ±0.1% of nominal voltage****
Vpk – 1 Vpk to 1400 Vpk 1 V 5% of nominal voltage
Voltage Crest Factor (CF) – 1.0 > 2.8 0.01 ±5%
Vrms½ 435-II 0.1 V ±0.2% of nominal voltage
Vfund 435-II 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 1A ±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 1A ±0.5% ±5 counts
1mV/A 10x 0.5 A A to 200 A (ac only) 0.1 A ±0.5% ±5 counts
Hertz
Hz Fluke 435 @ 50 Hz nominal 42.500 Hz to 57.500 Hz 0.001 Hz ±0.01 Hz
Fluke 435 @ 60 Hz nominal 51.000 Hz to 69.000 Hz 0.001 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% *
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° 1° ±n x 1°
Flicker
Plt, Pst, Pst(1min) 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 mm 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 32GB 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
Warranty Three years (parts and labor) on main instrument, one year on accessories

* ±5% if ≥ 1 % of nominal voltage ±0.05% of nominal voltage if < 1% of nominal voltage
** 50Hz/60Hz nominal frequency according to IEC 61000-4-30
*** 400Hz measurements are not supported for Flicker, Mains Signaling and Monitor Mode.
**** for nominal voltage 50 V to 500 V.
Three Phase Power Analyser