Fluke 1736 and 1738 Three-Phase Power Quality Loggers


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Fluke 1736 and 1738 Three-Phase Power Quality Loggers

The Fluke 1736 and 1738 Three-Phase Power Loggers built with Fluke Connect¨ mobile app and desktop software compatibility give you the data you need to make critical power quality and energy decisions in real-time. The ideal test tools for conducting energy studies and basic power quality logging, the 1736 and 1738 automatically capture and log over 500 power quality parameters so you have more visibility into the data you need to optimize system reliability and savings. With the Fluke 1738 Advanced Power Logger you can perform advanced analysis with an enhanced Power Quality Health Summary (EN50160) function that provides you with fast insight into overall electrical system health. The Power Quality Health Summary is an evaluation of the logged data based on detailed power quality measurements and includes viewable event waveform captures so you have even more visibility into the data you need to optimize system reliability and savings.

Get the Fluke Guide to Choosing Power Quality Tools _

An optimized user interface, flexible current probes, and an intelligent measurement verification function that allows you to reduce measurement errors by digitally verifying and correcting common connection errors makes setup easier than ever and reduces measurement uncertainty. Access and share data remotely with your team via the Fluke Connect¨ app so you can maintain safer working distances and make critical decisions in real-time, reducing the need for protective equipment, site visits and check-ins. You can also quickly and easily chart and graph measurements to help identify issues and create detailed reports with the included Fluke Energy Analyze Plus software package. Optionally, you can create IEEE519 Reports giving you more insight into harmonic levels, voltage and current distortion, and load current (license required).

Other useful features

  • Present data locally on the logger, on the Fluke Connect mobile app and desktop software, or through your facilityÕs Wi-Fi infrastructure
  • Measure all three phases and neutral with four flexible current probes (included)
  • Power the instrument directly from the measured circuit
  • Review measured values during logging sessions and before downloading for real-time analysis
  • Includes event waveform snapshot and high-resolution RMS profile with the 1738, along with date, timestamp and severity to capture dips, swells, and inrush currents and help pinpoint potential root causes of power quality issues
  • 1738 also provides fast insight into overall electrical system health with a Power Quality Health Summary
  • Offers a bright, color touch-screen display for convenient field analysis and data checks
  • Helps you capture the right data every time with a quick, guided, graphical user interface
  • Reduces uncertainty about your connections with the intelligent verification function
  • Allows you to complete field setups through the front panel or the Fluke Connect App on your smartphone
  • Provides fully integrated logging with other Fluke Connect-enabled devices to simultaneously log up to two additional measurement parameters on a Fluke Connect wireless digital multimeter or module*
  • Comes with Energy Analyze Plus application software that enables you to analyze every detail of energy consumption and power quality health and create automated reports

Log the most common parameters

Designed to measure the most critical three phase power parameters, the 1736 and 1738 can simultaneously log rms voltage, rms current, voltage and current events, voltage and current THD, voltage and current harmonics up to the 50th harmonic, active power, reactive power, power factor, active energy, reactive energy, and more. With enough memory for more than a year of data logging, the 1736 and 1738 can uncover intermittent or hard-to-find issues that might otherwise have been missed.

Analysis and reporting

Capturing logged data is just one part of the task. Once you have the data, you need to create useful information and reports that can be easily shared and understood by your organization or customers. Fluke Energy Analyze Plus software makes that task as simple as possible. With powerful analysis tools and the ability to create customized reports in minutes youÕll be able to communicate your findings and quickly solve problems so you can optimize system reliability and savings.

Key features

  • Versatile, three-phase power loggers for conducting energy, load and power quality studies.
  • Automatically capture and log voltage, current, power, harmonics and associated power quality values, and capture dips, swells, and inrush currents with event waveform snapshots and high-resolution RMS profiles.
  • Convenient instrument poweringÊdirectly from the measured circuit
  • Download and analyze every detail of energy consumption and power quality state of health with our automated reporting.

ParameterRangeResolutionIntrinsic 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 V³ 10 V: ±5% of reading
< 10 V: ±0.5V
Current harmonics 2nd to 50thDefined by accessoryDefined by accessory³ 3% of current range: ±5% of reading
< 3% of current range: ±0.15% of range
Intrinsic Uncertainty ±(% of reading +% of range)_
ParameterInfluence quantityiFlex1500-12iFlex3000-24iFlex6000-36i40S-EL
150 A / 1500 A300 A / 3000 A600 A / 6000 A4 A / 40 A
Active PowerÊPPF ³ 0.991.2% + 0.005%1.2% + 0.0075%1.7% + 0.0075%1.2% + 0.005%
Active EnergyÊEaPF ³ 0.991.2% + 0.005%1.2% + 0.0075%1.7% + 0.0075%1.2% + 0.005%
Apparent powerÊS0 ² PF ² 11.2% + 0.005%1.2% + 0.0075%1.7% + 0.0075%1.2% + 0.005%
Apparent EnergyÊEap0 ² PF ² 11.2% + 0.005%1.2% + 0.0075%1.7% + 0.0075%1.2% + 0.005%
Reactive powerÊQ0 ² PF ² 12.5% of measured apparent power
Reactive EnergyÊEr0 ² PF ² 12.5% of measured apparent power
Power Factor PF-±0.025
Displacement Power Factor-±0.025
Additional uncertainty in% of range_VP-N>250 V0.015%0.0225%0.0225%0.015%
_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: Cos_/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)
Efficiency³ 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-_, 1-_ IT, Split phase, 3-_ delta, 3-_ wye, 3-_ wye IT, 3-_ wye balanced, 3-_ Aron/Blondel (2-element delta), 3-_ 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 events_
_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)
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 M½
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 altitude12,000m
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
* Reference condition:
  • Environmental: 23 ¡C ±5 ¡C, no external electrical/magnetic field, RH 65%
  • Primary conductor in center position