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Fluke 1742, 1746 and 1748 Three-Phase Power Quality Loggers

Disturbance Analyzer: Fluke 1740 Series Three-Phase Power Quality Loggers

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 Fluke 1740 Series

Power quality logging is easy with a compact and rugged Fluke power meter

The Fluke 1740 Series three-phase power quality loggers are everyday power meters for technicians who troubleshoot and analyze power quality issues. Capable of simultaneously logging up to 500 power parameters for up to 85 days and monitoring for events, these power loggers help uncover intermittent and hard-to-find power quality issues. The included PQ Log software quickly assesses the quality of power at the service entrance, substation, or at the load, according to the latest EN50160 standard.


Disturbance analysis – Uncover root cause of equipment malfunction for later mitigation and predictive maintenance
Quality of service compliance – Validate incoming power quality at the service entrance
Power quality studies – Assess baseline power quality to validate compatibility with critical systems before installation
Load studies – Verify electrical system capacity before adding loads
Energy and power quality assessment – Validate performance of facility improvements by quantifying energy consumption, power factor, and general power quality before and after improvements


  • Plug and play: Setup in minutes with automatic current probe detection and powering
  • Installs inside the cabinet: Compact, fully-insulated housing and accessories fit easily in tight spaces next to live power
  • Determines the root cause: Included PQ Log software quickly analyzes trends, creates statistical summaries, and generates detailed graphs and tables
  • Monitors power for the long-term: Data can be downloaded during recording without interruption
  • Measure voltage with premium accuracy: IEC61000-4-30 Class-A compliant voltage accuracy (0.1%)
  • Quickly validate quality of power: Assess power quality according to EN50160 power quality standard with statistical overview
  • Rugged and reliable: Designed for everyday field use with no moving parts and durable insulated case with two year warranty


Loggers for every application

The portable Fluke 1740 Series power quality loggers are designed for easy installation and use, anywhere in low- and medium-voltage applications. There are three models to choose from to meet your basic or advanced power logging needs.

Fluke 1743: IP65 water-proof monitor for logging the most common power parameters including V, A, W, VA, VAR, PF, energy, flicker, voltage events, and THD.

Fluke 1744: Includes the same features as the Fluke 1743. In addition to common power parameters, the Fluke 1744 also measures voltage and current harmonics, interharmonics, mains signaling, unbalance, and frequency.

Fluke 1745: Advanced IP50 power quality logger with the same measurement capability as the 1744, plus real-time LCD, five hour UPS.

Product Feature Fluke 1745 Fluke 1744 Fluke 1743
Measurement of common power parameters: V, A, W, VA, VAR, PF, energy, flicker, voltage events, and THD
Measurement of voltage and current harmonics to the 50th, unbalance, and mains signaling  
Dust/water resistance IP50 IP65 water proof IP65 water proof
UPS ride-through 5 hrs 3s 3s
Dimensions (HxWxD) 282 x 216 x 74 mm (11.5 x 8.8 x 3 in.) 170 x 125 x 55 mm (6.9 x 5.1 x 2.2 in.) 170 x 125 x 55 mm (6.9 x 5.1 x 2.2 in.)

General Data
Intrinsic error
 Refers to the reference conditions and is guaranteed for two years
 2 years
Recalibration interval
 2 years recommended
Quality system
 developed, designed, and manufactured according to DIN ISO 9001
Reference conditions
 23 °C ± 2 K; 74 °F ± 2 K , Vm=230 V ± 10%, 50 Hz ± 0.1 Hz or 60 Hz ± 0.1 Hz
Phase sequence:  L1, L2, L3
Interval length:  10 minutes
Wye connection:  (L1, L2, L3 to N)
Power supply:  88 V ... 265 V AC
Environment conditions
Working temp. range:  -10 °C to 55°C; 14 °F to 131°F
Operating temp. range:  0 °C to 35°C; 32 °F to 95°F
Storage temp. range:  -20 °C to 60°C; -4 °F to 140°F
Reference temp. range:  23 °C ± 2 K; 74 °F ± 2 K
Relative humidity:  Fluke 1745: Class B2 acc. IEC 60654-1
Fluke 1744/43: Class C2 acc. IEC 60654-1
 robust, fully insulated housing and accessories
Protection type
Fluke 1745:  IP50 as per EN 60529
Fluke 1744/1743:  IP65 as per EN 60529
 IEC/EN 61010-1 600 V CAT III, 300 V CAT IV, pollution degree 2, double insulation
Type test voltage
 5.2 kV rms, 50 Hz / 60 Hz, 5 s
Emission:  IEC/EN 61326-1, EN55022
Immunity:  IEC/EN 61326-1

Voltage and Current Measurement
Input voltage
Input range VI P-N:  max 480 V AC
Input range VI P-P:  max 830 V AC
Max. overload voltage:  1.2 VI
Input range selection:  By job programming
Connections:  P-P or P-N, 1- or 3-phase
Nominal voltage VN:  <= 999 kV with PTs and ratio
Input resistance:  App. 820 kΩ per chan. Lx-N Single phase (L1 or A, L2 or B, L3 or C connected): app. 300 kΩ
Intrinsic uncenrtainty:  0.1 % of VI
Voltage transformer:  Ratio: <999 kV / VI
Ration selection:  By job programming
Current input with Flexi Set
Input ranges II L1 or A, L2 or B, L3 or C, N:  15 A / 150 A / 1500 A / 3000 A ac
Measuring range:  0.75 A … 3000 A ac
Intrinsic uncertainty:  < 2 % of II
Position influence:  Max. ± 2 % of measured value – for distance conductor to meas. head > 30 mm
Stray field influence:  < ± 2 A ac for Iext=500 A ac and distance to measuring head > 200 mm
Temperature coefficient:  < 0.05 % / K
Current transformer:  Ratio <= 999 kA / II
Ratio selection:  By job programming
Connection:  3-phase, 3-phase +N, 2 phase L1 or A and L3 or C (2 W-meter-method) 7 pole connector
Current input for clamp
Input ranges II L1 or A,
L2 or B, L3 or C, N:
 0.5 V nominal (for II) 1.4 Vpeak
Intrinsic uncertainty:  < 0.3 % of II
Max. overload:  10 V ac
Input resistance:  App. 8.2 kΩ
Current transformer:  Ratio Ω 999 kA / II
Power systems
 Delta, 2-Element Delta, Wye, Single Phase, Split Single Phase

Power supply
Functional Range:  88 V to 660 V absolute, 50 Hz / 60 Hz
100 V to 350 V dc Internal fuse: 630 mA T
Power consumption:  5 Watts
Ride through:  Fluke 1745: Internal battery for typ. > 5 hours ride through with intelligent power management
Fluke 1743/44: 3 sec Capacitor
Fuse:  Power supply fuse can be replaced in service facility only. Supply can be connected in parallel to measuring inputs (up to 660 V)
Display, indicators
 LEDs for status and voltage levels
Fluke 1745: LC-display with backlight for voltage, current, active power, phase sequence.
 Capacity 8 MB Flash-EPROM
Intervals:  A function > 12000 intervals for > 85 days with 10 min intervals
P function > 30000 intervals for > 212 days with 10 min intervals
Events:  > 13000
Memory model:  linear, circular
 RS 232, 9600...115 000 Baud, automatic Baud rate selection, 3-wire communication
Fluke 1745:  282 mm x 216 mm x 74 mm (115in x 88in x 33in)
Fluke 1743/1744:  170 mm x 125 mm x 55 mm (69in x 51in x 22in)
Fluke 1745:  approx. 3 kg
Fluke 1744/1743:  approx. 2 kg
A/D converter:  16 bit, sample rate: 10.24 kHz
Anti-aliasing filter:  FIR-Filter, fc =4.9 kHz
Frequency response:  Uncertainty < 1 % of Vm for 40 Hz to 2500 Hz
Interval length:  1, 3, 5, 10, 30 s, 1, 5, 10, 15, 60 minutes
Averaging time for Min/max values:  ½, 1 mains period, 200 ms,1 , 3 , 5 s
Time base:  Resolution: 10 ms (at 50 Hz), deviation: 2s/day at 23 °C; 74 °F ± 2 K
Model NameDescriptionPrice List
Fluke 1743 Power Quality Logger Memobox

All models include:

  • 4 Flexible probes 15/150/1500/3000 A with 2 m cable
  • CD-ROM with PQ Log software
  • RS232 interface cable and RS232-USB adapter
  • Test leads for voltages and power supply
  • 4 black dolphin clips
  • Color localization kit
  • Carrying bag
  • Test certificate with measurement values
  • Printed English manual
  • Multi-language manual CD
On Request
Fluke 1743 Basic Power Quality Logger Memobox
Excl. current clamps FS17xx
On Request
Fluke 1744Power Quality Logger Memobox On Request
Fluke 1744 Basic Power Quality Logger Memobox
Excl. current clamps FS17xx
On Request
Fluke 1745Power Quality Logger Memobox On Request

Current clampsPrice List
I1A/10A Clamp PQ3I1A/10A Clamp PQ3 3-Phase 1A/10AOn Request
I1A/10A Clamp PQ4I1A/10A Clamp PQ4On Request
I20A/200A Clamp PQ3I20A/200A PQ3 3-Phase ClampOn Request
I20A/200A Clamp PQ4I20A/200A PQ4 ClampOn Request
I5A/50A Clamp PQ3I5A/50A Clamp PQ3 3-Phase 5A/50AOn Request
I5A/50A Clamp PQ4I5A/50A Clamp PQ4On Request

Rack Mounts HardwarePrice List
1743/44 Poleset1743/44 POLESET Mounting Kit for Fluke 1743/1744On Request

Test LeadsPrice List
VL1735/45VL1735/45 Banana 4-Phase voltage lead set for Fluke 1735/45On Request
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