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Power Quality Logger

Fluke 1738

Power Quality Logger

Poor power quality is one of the primary causes of costly downtime and detrimental long-term effects on the health of mining equipment and systems.

The Fluke 1738 Three-Phase Power Quality Logger provides visibility into your recorded data to help you make critical power quality and energy decisions in real-time, helping you optimise your site’s reliability and cost savings.

  • Automatically capture and log voltage, current, power, harmonics, and associated power quality values

  • Capture dips, swells, and inrush currents with event waveform snapshots and high-resolution RMS profiles

  • Easily download and analyse every detail of energy consumption and power quality health with automated reporting software

Download Datasheet
Download Datasheet
Electrical Specifications
Voltage range
100 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 consumption
Maximum 50 VA (max. 15 VA when powered using IEC 60320 input)
≥ 68.2% (in accordance with energy efficiency regulations)
Maximum no-load consumption
< 0.3 W only when powered using IEC 60320 input
Mains power frequency
50/60 Hz ±15%
Li-ion 3.7 V, 9.25 Wh, customer-replaceable
On-battery runtime
Four hours in standard operating mode, up to 5.5 hours in power saving mode
Charging time
< 6 hours
Data Acquisition
16-bit synchronous sampling
Sampling frequency
10.24 kHz at 50/60 Hz, synchronized to mains frequency
Input signal frequency
50/60 Hz (42.5 to 69 Hz)
Circuit types
1-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 storage
Typical 10 logging sessions of 8 weeks with 1-minute intervals and 500 events¹
Basic Interval
Measured parameters
Voltage, current, aux, frequency, THD V, THD A, power, power factor, fundamental power, DPF, energy
Averaging interval
User selectable: 1 sec, 5 sec, 10 sec, 30 sec, 1 min, 5 min, 10 min, 15 min, 30 min
Averaging time min/max values
Voltage, Current: Full cycle RMS updated every half cycle (URMS1/2 according to IEC61000-4-30 Aux, Power: 200ms
Demand Interval (Energy Meter Mode)
Measured parameters
Energy (Wh, varh, VAh), PF, maximum demand, cost of energy
User selectable: 5 min, 10 min, 15 min, 20 min, 30 min, off
Power Quality Measurements
Measured parameter
Voltage, frequency, unbalance, voltage harmonics, THD V, current, harmonics, THD A, TDD
Averaging interval
10 min
Individual harmonics
2nd to 50th harmonic
Total harmonic distortion
Calculated on 50 harmonics
Voltage: dips, swells, interruptions, current: inrush current
Triggered recordings
Full 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
IEC 61000-4-7: Class 1, IEEE 519 (short time harmonics)
Power quality
IEC 61000-4-30 Class S, IEC62586-1 (PQI-S device)
IEEE 1459
Power quality compliance
EN50160 (for measured parameters)
File transfer via USB flash drive, firmware updates, Max. current: 120 mA
File transfer and remote control via direct connection or WiFi infrastructure
Read auxiliary measurement data from Fluke Connect® 3000 series modules (requires 1738 or 1736 upgrade option)
Data download device to PC
General Specifications
Color LCD display
4.3-inch active matrix TFT, 480 pixels x 272 pixels, resistive touch panel
Instrument and power supply: Two-years (battery not included), Accessories: one-year, Calibration cycle: two-years
Instrument: 19.8 cm x 16.7 cm x 5.5 cm, Power supply: 13.0 cm x 13.0 cm x 4.5 cm, Instrument with power supply attached: 19.8 cm x 16.7 cm x 9 cm
Instrument: 1.1 kg, Power supply: 400 g
Tamper protection
Kensington lock slot
Power Quality Logger

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