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The Fluke 1738 Three-Phase Advanced Power Logger built with Fluke Connect® mobile app and desktop software compatibility gives you the data you need to make critical power quality and energy decisions in real-time. Like the Fluke 1736 Power Logger, the 1738 Advanced Power Logger automatically captures and logs over 500 power quality parameters while also allowing you to troubleshoot more advanced power quality issues.
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 based on detailed power quality data including viewable event waveform captures so you have even more visibility into the data you need to optimize system reliability and savings.
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, or access your logger through your facilities WiFi infrastructure 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).
The Fluke 1738 is the ideal test tool for conducting energy studies and more advanced power quality logging.
Key measurements: Automaticall­y capture and log voltage, current, power, harmonics and associated power quality values.
Fluke Connect® compatible*: View data locally on the instrument, via Fluke Connect mobile app and desktop software or through your facilities WiFi infrastructure.
Convenient instrument powering: Power instrument directly from the measured circuit.
Highest safety rating in the industry: 600 V CAT IV/1000 V CAT III rated for use at the service entrance and downstream.
Measure all three phases and neutral: With included 4 flexible current probes.
Comprehensive logging: More than 20 separate logging sessions can be stored on the instruments. In fact, all measured values are automatically logged so you never loose measurement trends. They can even be reviewed during logging sessions and before downloading for real-time analysis.
Capture dips, swells, and inrush currents: Includes event waveform snapshot and high resolution RMS profile, along with date, timestamp and severity to help pinpoint potential root causes of power quality issues.
Power Quality Health Summary: Summarizes the most important power quality health parameters to provide fast insight into overall electrical system health, indicating whether more detailed analysis and reporting should be done.
Bright, color touch screen: Perform convenient in-the-field analysis and data checks with full graphical display.
Optimized user interface: Capture the right data every time with quick, guided, graphical setup and reduce uncertainty about your connections with the intelligent verification function.
Complete “in-the-field" setup through the front panel or Fluke Connect App: No need to return to the workshop for download and setup or to take a computer to the electrical panel.
Fully integrated logging: Connect other Fluke Connect devices to the Fluke 1738 to simultaneously log up to two other measurement parameters, virtually any parameter available on a Fluke Connect wireless digital multimeter.*
Energy Analyze Plus application software: Download and analyze every detail of energy consumption and power quality state of health with our automated reporting.
Parameter Range Resolution Intrinsic Accuracy at Reference Conditions (% of Reading +% of Full Scale)
Voltage 1000 V 0.1 V ±(0.2% + 0.01%)
Current: Direct input i17xx-flex 1500 12" 150 A 0.1 A ±(1% + 0.02%)
1500 A 1 A
i17xx-flex 3000 24" 300 A 1 A ±(1% + 0.03%)
3000 A 10 A
i17xx-flex 6000 36" 600 A 1 A ±(1.5% + 0.03%)
6000 A 10 A
i40s-EL clamp 4 A 1 mA ±(0.7% + 0.02%)
40 A 10 mA
Frequency 42.5 Hz to 69 Hz 0.01 Hz ±(0.1%)
Auxillary input ±10 V dc 0.1 mV ±(0.2% + 0.02%)
Voltage min/max 1000 V 0.1 V ±(1% + 0.1%)
Current min/max Defined by accessory Defined by accessory ±(5% + 0.2%)
THD on voltage 1000% 0.1% ±0.5
THD on current 1000% 0.1% ±0.5
Voltage harmonics 2nd to 50th 1000 V 0.1 V ≥ 10 V: ±5% of reading
< 10 V: ±0.5V
Current harmonics 2nd to 50th Defined by accessory Defined by accessory ≥ 3% of current range: ±5% of reading
< 3% of current range: ±0.15% of range
Unbalance 100% 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 P 
PF ≥ 0.99 1.2% + 0.005% 1.2% + 0.0075% 1.7% + 0.0075% 1.2% + 0.005%
Active Energy Ea
Apparent power S 0 ≤ PF ≤ 1 1.2% + 0.005% 1.2% + 0.0075% 1.7% + 0.0075% 1.2% + 0.005%
Apparent Energy Eap
Reactive power Q 0 ≤ PF ≤ 1 2.5% of measured apparent power
Reactive Energy Er
Power Factor PF - ±0.025
Displacement Power Factor
Additional uncertainty in% of range¹ VP-N>250 V 0.015% 0.0225% 0.0225% 0.015%
¹Range = 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: CosÏ•/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
Model Name Description
FLUKE 1738/B Portable Advanced Power Logger (excludes current probes)
FLUKE 1738/EUS Portable Advanced Power Logger EU/US Version
FLUKE 1738/INTL Portable Advanced Power Logger International Version
FLUKE 1738/WINTL Portable Advanced Logger International Version (with additional power cables)
Cases and Holsters
173X-Hanger Kit Strap Kit, Hanging Strap
C17XX C17XX Soft Case
Test Probes
MP1-MAGNET PROBE 1 Magnet Probes for 4mm banana, Set of 4
Batteries, Chargers and Adapters
FLUKE-173X AUX Fluke 173X AUX, Input adapter
FLK-WIFI/BLE Fluke WiFi/BLE Adapter
Current clamps
FLUKE-17XX i40s-EL 40A Clamp-on Current Transformer
FLUKE-17XX i40s-EL/3pk 40A Clamp-on Current Transformer, 3 pack
i17XX-flex1500 1500A 12 inch iFlex® Current Clamps
i17XX-flex1500/3pk 1500A 12 inch, 3 pack iFlex® Current Clamps
i17XX-flex1500/4pk 1500A 12 inch, 4 pack iFlex® Current Clamps
i17XX-flex3000 3000A 24 inch iFlex® Current Clamps
i17XX-flex3000/3pk 3000A 24 inch, 3 pack iFlex® Current Clamps
i17XX-flex3000/4pk 3000A 24 inch, 4 pack iFlex® Current Clamps
i17XX-flex6000 6000A 36 inch iFlex® Current Clamps
i17XX-flex6000/3pk 6000A 36 inch, 3 pack iFlex® Current Clamps
i17XX-flex6000/4pk 6000A 36 inch, 4 pack iFlex® Current Clamps
Test Leads
FLUKE-17xx-TL 0.1M Test Lead Set, 1000V CAT III, Non-stackable connectors; 0.1M; Red/Blk
FLUKE-17XX-TL 1.5M Test Lead Set, 1000V CAT III, Non-stackable connectors; 1.5M; Red/Blk
3PHVL-1730 Cable Assembly, Voltage Test Lead 3-Phase+N
WC100 WC100 Color Localization Set