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Fluke 1743 Three Phase Power Quality Logger Memobox

Model: 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.

This product has been discontinued. Click here for the replacement model(s).

Fluke 1743 Offers

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 Fluke 1743 is a powerful three-phase power quality logger capable of logging the most common power parameters you'll need for power quality monitoring such as:
  • V, A, W, VA, VAR
  • Power Factor
  • Energy
  • Flicker
  • Voltage
  • THD
Apart from the Fluke 1743, the Fluke 1740 series includes two other power quality loggers: Fluke 1744 & Fluke 1745.
  • The Fluke 1744 includes the same features as the Fluke 1743 but can measure voltage and current harmonics, interharmonics, mains signaling, unbalance and frequency.
  • The Fluke 1745 includes the same features as the Fluke 1744 but features an IP50 environmental rating, a real-time LCD display and a 5 hour UPS which is great if you need to read more data at the meter and have a longer backup battery life where there's less chance of it getting wet.
The main difference between the 1743 and the other 2 models in the series, is the 1743 does not measure harmonics, unbalance or mains signaling. If you need to require these measurements, we recommend looking at the higher models.
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

Fluke 1743 Specifications

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
Click here for complete specifications on the Fluke 1743

What's included with the Fluke 1743

  • 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
View graphs and generate reports with Fluke Power Quality Log software

With its easy-to-use interface, the included Power Quality Log software assists you with logger setup, enables you to verify actual measurement values quickly using the online function, and downloads data from the logger to a connected PC operating on standard Windows® operating systems. You can view the logged data in graphical and tabular form, export it to a spreadsheet, or generate a professional report with the Report Writer function.

  • For root cause analysis, different measurements such as flicker, voltage and THD can be shown in the same time plot, helping to quickly identify the cause of a disturbance.
  • Statistical summaries like EN50160 and DISDIP table provide a quick, comprehensive summary. The EN50160 overview display provides a simple display of 8 power quality parameters on one dashboard, according to the latest international power quality standard.
  • Statistical analysis of Voltage and Current harmonics over a given time period. Red bar graphs indicate issues with the grid. Other colors are warnings for pontential future issues.  Harmonics can be presented also as time plots.


Click on a category to view a selection of compatible accessories with the Fluke 1743 Three Phase Power Quality Logger Memobox.

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Customer Reviews for the Fluke 1743