Fluke 1736 and 1738 Three-Phase Power Quality Loggers

$6,820.00

The Fluke 1736 and 1738 are three-phase power loggers for measuring energy consumption, load characteristics, harmonics, and power quality over extended periods. They help engineers and maintenance teams identify intermittent electrical problems and evaluate system performance.

With a color touchscreen, guided setup, flexible current probes, wireless connectivity, and Energy Analyze Plus software, the loggers support efficient field measurements and detailed analysis after data collection.

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The Fluke 1736 and 1738 Three-Phase Power Quality Loggers provide a practical solution for understanding how an electrical system is performing over time. Rather than relying on individual spot measurements, they continuously record key electrical parameters so engineers can identify energy consumption patterns, load variations, harmonic distortion, and intermittent power quality problems that may otherwise be difficult to detect.

The instruments simultaneously measure three-phase voltage and current plus neutral, while recording active and reactive power, power factor, energy, frequency, voltage and current THD, harmonics, unbalance, and other electrical parameters. Voltage and current harmonics can be analyzed through the 50th harmonic, while events such as voltage dips, swells, interruptions, and inrush currents can be captured during logging.

Setup is simplified through flexible current probes, a guided graphical interface, and an intelligent measurement verification function that digitally checks connections and helps correct common wiring errors. The logger can also be powered directly from the circuit being measured, reducing the need for an additional power source during field studies.

Both the 1736 and 1738 are compatible with the Fluke Connect ecosystem and can transfer measurement data for remote viewing, sharing, and analysis. The included Fluke Energy Analyze Plus software allows users to visualize logged measurements, analyze energy consumption and power quality, and generate detailed reports.

The Fluke 1738 is the advanced model in the series. In addition to the core logging capabilities, it provides a Power Quality Health Summary based on EN50160 measurements and includes event waveform captures with high-resolution RMS profiles. These functions provide additional information for investigating the causes and severity of power quality problems.

Key Features

  • Three-phase power and power quality logging
  • Records 500+ electrical and power quality parameters
  • Simultaneous measurement of three phases and neutral
  • RMS voltage and current measurement
  • Active, reactive and apparent power
  • Active and reactive energy measurement
  • Power factor and displacement power factor
  • Voltage and current THD
  • Individual voltage and current harmonics up to the 50th harmonic
  • Voltage unbalance measurement
  • Detection of dips, swells and interruptions
  • Inrush current recording
  • Event waveform capture on Fluke 1738
  • High-resolution RMS event profiles on Fluke 1738
  • Power Quality Health Summary on Fluke 1738
  • Intelligent measurement verification
  • Guided graphical setup interface
  • Four flexible current probes for three phases and neutral
  • Power the instrument directly from the measured circuit
  • Bright color touchscreen display
  • Fluke Connect wireless connectivity
  • Fluke Energy Analyze Plus software
  • More than one year of data logging memory under specified conditions
  • IEC 61000-4-30 Class S power quality measurement
  • IEEE 519 harmonic measurement support
  • EN50160 compliance evaluation for applicable measured parameters

Typical Applications

  • Three-phase energy studies
  • Electrical load studies
  • Energy consumption analysis
  • Power quality surveys
  • Harmonic measurements
  • Electrical system troubleshooting
  • Voltage event investigation
  • Inrush current analysis
  • Power distribution system monitoring
  • Facility energy management
  • Preventive electrical maintenance
  • Identification of intermittent electrical problems
  • Power quality reporting and documentation

Specifications: Fluke 1736 and 1738 Three-Phase Power Quality Loggers

Accuracy

Parameter Accessory Range Resolution Intrinsic Accuracy at Reference Conditions (% of Reading +% of Full Scale)
Voltage1000 V0.1 V±(0.2% + 0.01%)
Current: Direct inputi17xx-flex 1500 12"150 A0.1 A±(1% + 0.02%)
1500 A1 A±(1% + 0.02%)
i17xx-flex 3000 24"300 A1 A±(1% + 0.03%)
3000 A10 A±(1% + 0.03%)
i17xx-flex 6000 36"600 A1 A±(1.5% + 0.03%)
6000 A10 A±(1.5% + 0.03%)
i40s-EL clamp4 A1 mA±(0.7% + 0.02%)
40 A10 mA±(0.7% + 0.02%)
Frequency42.5 Hz to 69 Hz0.01 Hz±(0.1%)
Auxillary input±10 V dc0.1 mV±(0.2% + 0.02%)
Voltage min/max1000 V0.1 V±(1% + 0.1%)
Current min/maxDefined by accessoryDefined by accessory±(5% + 0.2%)
THD on voltage1000%0.1%±0.5
THD on current1000%0.1%±0.5
Voltage harmonics 2nd to 50th1000 V0.1 V≥ 10 V: ±5% of reading
< 10 V: ±0.5V
Current harmonics 2nd to 50thDefined by accessoryDefined by accessory≥ 3% of current range: ±5% of reading
< 3% of current range: ±0.15% of range
Unbalance100%0.1%±0.2

Intrinsic Uncertainty ±(% of reading +% of range)¹

Parameter Influence quantity iFlex1500-12 iFlex3000-24 iFlex6000-36 i40S-EL
150 A / 1500 A 300 A / 3000 A 600 A / 6000 A 4 A / 40 A
Active Power PPF ≥ 0.991.2% + 0.005%1.2% + 0.0075%1.7% + 0.0075%1.2% + 0.005%
Active Energy EaPF ≥ 0.991.2% + 0.005%1.2% + 0.0075%1.7% + 0.0075%1.2% + 0.005%
Apparent power S0 ≤ PF ≤ 11.2% + 0.005%1.2% + 0.0075%1.7% + 0.0075%1.2% + 0.005%
Apparent Energy Eap0 ≤ PF ≤ 11.2% + 0.005%1.2% + 0.0075%1.7% + 0.0075%1.2% + 0.005%
Reactive power Q0 ≤ PF ≤ 12.5% of measured apparent power
Reactive Energy Er0 ≤ PF ≤ 12.5% of measured apparent power
Power Factor PF-±0.025
Displacement Power Factor-±0.025
DBF/cosϕ-±0.025
Additional uncertainty in% of range¹VP-N>250 V0.015%0.0225%0.0225%0.015%

¹ Range = 1000 V x Irange

Reference conditions:
Environmental: 23 °C ±5 °C, instrument operating for at least 30 minutes, no external electrical/magnetic field, RH <65%
Input conditions: Cosϕ/PF=1, Sinusoidal signal f=50 Hz/60 Hz, power supply 120 V/230 V ±10%.
Current and power specifications: Input voltage 1 ph: 120 V/230 V or 3 ph wye/delta: 230 V/400 V Input current: I > 10% of Irange
Primary conductor of clamps or Rogowski coil in center position
Temperature coefficient: Add 0.1 x specified accuracy for each degree C above 28 °C or below 18 °C

Electrical Specifications

Power Supply

Voltage range100 V to 500 V using safety plug input when powering from the measurement circuit
100 V to 240 V using standard power cord (IEC 60320 C7)
Power consumptionMaximum 50 VA (max. 15 VA when powered using IEC 60320 input)
Efficiency≥ 68.2% (in accordance with energy efficiency regulations)
Maximum no-load consumption< 0.3 W only when powered using IEC 60320 input
Mains power frequency50/60 Hz ±15%
BatteryLi-ion 3.7 V, 9.25 Wh, customer-replaceable
On-battery runtimeFour hours in standard operating mode, up to 5.5 hours in power saving mode
Charging time< 6 hours

Data Acquisition

Resolution16-bit synchronous sampling
Sampling frequency10.24 kHz at 50/60 Hz, synchronized to mains frequency
Input signal frequency50/60 Hz (42.5 to 69 Hz)
Circuit types1-φ, 1-φ IT, Split phase, 3-φ delta, 3-φ wye, 3-φ wye IT, 3-φ wye balanced, 3-φ Aron/Blondel (2-element delta), 3-φ delta open leg, Currents only (load studies)
Data storageInternal flash memory (not user replaceable)
Memory sizeTypical 10 logging sessions of 8 weeks with 1-minute intervals and 500 events¹

¹ The number of possible logging sessions and logging period depends on user requirements.

Basic Interval

Measured parametersVoltage, current, aux, frequency, THD V, THD A, power, power factor, fundamental power, DPF, energy
Averaging intervalUser selectable: 1 sec, 5 sec, 10 sec, 30 sec, 1 min, 5 min, 10 min, 15 min, 30 min
Averaging time min/max valuesVoltage, Current: Full cycle RMS updated every half cycle (URMS1/2 according to IEC61000-4-30) Aux, Power: 200ms

Demand Interval (Energy Meter Mode)

Measured parametersEnergy (Wh, varh, VAh), PF, maximum demand, cost of energy
IntervalUser selectable: 5 min, 10 min, 15 min, 20 min, 30 min, off

Power Quality Measurements

Measured parameterVoltage, frequency, unbalance, voltage harmonics, THD V, current, harmonics, THD A, TDD
Averaging interval10 min
Individual harmonics2nd to 50th harmonic
Total harmonic distortionCalculated on 50 harmonics
EventsVoltage: dips, swells, interruptions, current: inrush current
Triggered recordingsFull cycle RMS updated every half cycle of voltage and current (Urms1/2 according to IEC61000-4-30)
Waveform of voltage and current (1738)

Standards Compliance

HarmonicsIEC 61000-4-7: Class 1
IEEE 519 (short time harmonics)
Power qualityIEC 61000-4-30 Class S, IEC62586-1 (PQI-S device)
PowerIEEE 1459
Power quality complianceEN50160 (for measured parameters)

Interfaces

USB-AFile transfer via USB flash drive, firmware updates
Max. current: 120 mA
WiFiFile transfer and remote control via direct connection or WiFi infrastructure
BluetoothRead auxiliary measurement data from Fluke Connect® 3000 series modules (requires 1738 or 1736 upgrade option)
USB-miniData download device to PC

Voltage Inputs

Number of inputs4 (3 phases and neutral)
Maximum input voltage1000 Vrms, CF 1.7
Input impedance10 MΩ
Bandwidth (-3 dB)42.5 Hz - 3.5 kHz
Scaling1:1 and variable
Measurement category1000 V CAT III/600 V CAT IV

Current Inputs

Number of inputs4, mode selected automatically for attached sensor
Input voltageClamp input: 500 mVrms/50 mVrms; CF 2.8
Rogowski coil input150 mVrms/15 mVrms at 50 Hz, 180 mVrms/18 mVrms at 60 Hz; CF 4; all at nominal probe range
Range1 A to 150 A/10 A to 1500 A with thin flexible current probe i17XX-flex1500 12"
3 A to 300 A/30 A to 3000 A with thin flexible current probe i17XX-flex3000 24"
6 A to 600 A/60 A to 6000 A with thin flexible current probe i17XX-flex6000 36"
40 mA to 4 A/0.4 A to 40 A with 40 A clamp i40s-EL
Bandwidth (-3 dB)42.5 Hz - 3.5 kHz
Scaling1:1 and variable

Auxiliary Inputs

Number of inputs2
Input range0 to ±10 V dc, 1reading/s
Scale factorFormat: mx + b (gain and offset) user configurable
Displayed unitsUser configurable (7 characters, for example, °C, psi, or m/s)

Wireless Connection

Number of inputs2
Supported modulesFluke Connect® 3000 series
Acquisition1 reading/s

Environmental Specifications

Operating temperature-10 °C to +50 °C (14 °F to 122 °F)
Storage temperature-20 °C to +60 °C (-4 °F to 140 °F), with battery: -20 °C to +50 °C (-4 °F to 122 °F)
Operating humidity10 °C to 30 °C (50 °F to 86 °F) max. 95% RH
30 °C to 40 °C (86 °F to 104 °F) max. 75% RH
40 °C to 50 °C (104 °F to 122 °F) max. 45% RH
Operating altitude2000 m (up to 4000 m derate to 1000 V CAT II/600 V CAT III/300 V CAT IV)
Storage altitude12,000 m
EnclosureIP50 in accordance with EN60529
VibrationMIL-T-28800E, Type 3, Class III, Style B
SafetyIEC 61010-1
IEC Mains Input: Overvoltage Category II, Pollution Degree 2
Voltage Terminals: Overvoltage Category IV, Pollution Degree 2
IEC 61010-2-031: CAT IV 600 V / CAT III 1000 V
Electromagnetic compatibilityEN 61326-1: Industrial CISPR 11: Group 1, Class A
Korea (KCC): Class A Equipment (industrial broadcasting and communication equipment)
USA (FCC): 47 CFR 15 subpart B. This product is considered an exempt device per clause 15.103
Temperature coefficient0.1 x accuracy specification/°C

General Specifications

Color LCD display4.3-inch active matrix TFT, 480 pixels x 272 pixels, resistive touch panel
WarrantyInstrument and power supply: Two-years (battery not included)
Accessories: one-year
Calibration cycle: two-years
DimensionsInstrument: 19.8 cm x 16.7 cm x 5.5 cm (7.8 in x 6.6 in x 2.2 in)
Power supply: 13.0 cm x 13.0 cm x 4.5 cm (5.1 in x 5.1 in x 1.8 in)
Instrument with power supply attached: 19.8 cm x 16.7 cm x 9 cm (7.8 in x 6.6 in x 3.5 in)
WeightInstrument: 1.1 kg (2.5 lb)
Power supply: 400 g (0.9 lb)
Tamper protectionKensington lock slot

i17xx-flex 1500 12" Flexible Current Probe Specifications

Measuring range1 to 150 A ac/10 to 1500 A ac
Nondestructive current100 kA (50/60 Hz)
Intrinsic error at reference condition*±0.7% of reading
Accuracy 173x + iFlex±(1% of reading + 0.02% of range)
Temperature coefficient over operating temperature range0.05% of reading/°C 0.09% of reading/°F
Working voltage1000 V CAT III, 600 V CAT IV
Probe cable length305 mm (12 in)
Probe cable diameter7.5 mm (0.3 in)
Minimum bending radius38 mm (1.5 in)
Output cable length2 m (6.6 ft)
Weight115 g
Probe cable materialTPR
Coupling materialPOM + ABS/PC
Output cableTPR/PVC
Operating temperature-20 °C to +70 °C (-4 °F to 158 °F) temperature of conductor under test shall not exceed 80 °C (176 °F)
Temperature, non-operating-40 °C to +80 °C (-40 °F to 176 °F)
Relative humidity, operating15% to 85% non-condensing
IP ratingIEC 60529: IP50
WarrantyOne-year

* Reference condition:
Environmental: 23 °C ±5 °C, no external electrical/magnetic field, RH 65%
Primary conductor in center position

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