Quick verdict
The Fluke 1735 is the standout three-phase power logger for its rugged build, intuitive setup, and ability to simultaneously log voltage, current, power, and harmonics, making it ideal for energy audits and troubleshooting without complex wiring.
Fluke 1735
Quick verdict
The Fluke 1735 is a three-phase power and energy logger built for electricians, energy auditors and facilities engineers who need to record load profiles and basic power-quality events over days at a time. If you want a logging device that captures voltage dips, swells and harmonics rather than a live handheld meter, it fits. It is overkill for a single technician doing spot checks.
Key takeaways
- Logging, not spot-checking: Fluke positions the 1735 as a three-phase logger that records energy use and power-quality events over time, not a real-time handheld.
- Energy efficiency focus: The manufacturer markets it for energy consumption tests so you can document before-and-after savings from efficiency upgrades.
- Power-quality capture: It is designed to measure harmonic distortion from electronic loads and capture voltage dips and swells from load switching.
- Calibrated and traceable: Units ship with a new NIST-traceable calibration certificate, which matters for compliance and audit documentation.
- Know its class: It is an entry-level logger in Fluke’s power-quality range, so demanding standards-grade analysis may need a higher-tier analyzer.
Why you should trust this review
I did not put a Fluke 1735 on my own bench, and I will not pretend otherwise. This review is built from Fluke’s published product documentation and the feature descriptions that ship with the unit, cross-read against how three-phase power loggers are used in the field. Where the manufacturer makes a specific claim, I attribute it to the manufacturer. Where a number is not clearly documented in the sources I trust, I leave it out rather than guess, because inventing a current range or accuracy figure would be worse than admitting I do not have it confirmed.
My goal here is to help you decide whether this category of instrument, and this model specifically, matches your job. That means being honest about what the 1735 is marketed to do well, what it is not, and where you would be better served by a different tier of tool. I have written about test and measurement gear long enough to know that a logger bought for the wrong reason ends up in a drawer, so I weigh fit-for-purpose over spec-sheet bragging.
What it is and who it is for
The Fluke 1735 is a three-phase power logger. Its core job is to connect to a three-phase (or single-phase) electrical system and record electrical parameters over an extended period so you can study how a site actually consumes power. Fluke aims it at energy surveys, load studies and basic power-quality investigations. The intended user is someone who needs evidence over time: an energy auditor proving a retrofit paid off, a facilities engineer hunting an intermittent fault, or a contractor sizing equipment from real load data rather than nameplate assumptions.
It is not a pocket meter and not a substitute for a true-RMS handheld when you need a quick reading at the panel. You install it, let it log, then pull the data for analysis. If your work is mostly point-in-time troubleshooting, a clamp meter or a power-quality handheld will serve you better day to day.
Key features and specs
The table below sticks to claims I am confident Fluke documents for the 1735. I have deliberately left blank anything I could not verify, because a power logger’s exact ranges and accuracy classes deserve to be read off the current official datasheet for your region rather than copied from a review.
| Spec | Fluke 1735 |
|---|---|
| Instrument type | Three-phase power and energy logger |
| Primary use | Energy consumption studies and load profiling |
| Power-quality events | Captures voltage dips and swells from load switching |
| Harmonics | Measures harmonic distortion caused by electronic loads |
| Calibration | Ships with a new NIST-traceable calibration certificate |
| Traceability | NIST calibration provides assurance the unit meets manufacturer specifications |
| Deployment style | Connect and log over time, then download for analysis |
How it handles energy consumption studies
Energy logging is the headline use case, and on paper it is where the 1735 earns its keep. Fluke markets it specifically to prove the benefit of efficiency improvements with energy consumption tests, which is exactly the workflow an auditor needs: log a baseline, make the change, log again, and show the difference in measured energy rather than estimates. That before-and-after evidence is what turns a proposed upgrade into a funded one.
The honest limitation is that a logger is only as good as its installation and its logging window. A few hours of data will not characterize a site whose load swings by shift, day or season, so meaningful energy studies often mean leaving the unit in place for days or weeks. Plan for that, including secure mounting and the connection accessories your system requires, before you commit to the model.
Power-quality capture: harmonics, dips and swells
For power quality, the 1735 is pitched at the two problems that bite most facilities. It is designed to measure harmonic distortion caused by electronic loads, the kind of distortion that drives motors, transformers and neutrals hotter than they should run. It also captures voltage dips and swells from load switching, which is how you catch the events behind nuisance trips and equipment resets that vanish before a handheld can see them. Because it logs continuously, it can catch an intermittent event you would otherwise miss.
The limitation to keep in mind is class. The 1735 sits at the accessible end of Fluke’s power-quality lineup, so if your work demands standards-compliant power-quality analysis to a formal class, or deep transient and flicker analysis, you should confirm whether this model meets that standard or whether a higher-tier analyzer is the right call. Treat it as a capable surveyor, not necessarily a certification-grade reference instrument.
Calibration and documentation
One genuinely useful detail for professional work is that each unit is calibrated prior to shipment with a new NIST-traceable calibration certificate. Fluke states that this calibration provides assurance the instrument meets the manufacturer’s specifications, which matters when your readings have to stand up in an audit, a compliance report or a dispute. Traceable calibration is the difference between a number someone trusts and a number someone argues with.
The caveat is that calibration is not permanent. A traceable certificate covers the unit as shipped, and instruments drift with use and time, so factor an ongoing recalibration interval into your ownership cost if you rely on the readings for formal documentation.
Who should buy it (and who should not)
Buy it if your work involves recording how a three-phase system behaves over time: energy audits, load studies, sizing decisions and chasing intermittent power-quality complaints. The combination of energy logging, harmonic measurement, dip and swell capture, and traceable calibration suits auditors, facilities engineers and contractors who need defensible data.
Do not buy it if you mainly need fast point-in-time readings at the panel, in which case a true-RMS handheld or clamp meter is the better and cheaper tool. And if you need certification-grade, standards-class power-quality analysis, verify the 1735 meets that requirement before buying, or step up to a higher-tier Fluke analyzer.
Frequently asked questions
Is the Fluke 1735 a meter or a logger? It is a logger. Fluke designs it to connect to a three-phase system and record energy and power-quality data over time, then download it for analysis, rather than to give you a single live reading like a handheld meter.
Does it come calibrated? Yes. Fluke states each unit is calibrated before shipment with a new NIST-traceable calibration certificate, which provides assurance the instrument meets the manufacturer’s specifications. Plan for periodic recalibration over the instrument’s life.
Can it find the cause of nuisance trips? Often, yes. Because it captures voltage dips and swells from load switching and measures harmonic distortion from electronic loads, it can record the intermittent events behind trips and resets that a spot check would miss, provided you log over a long enough window.
The verdict
The Fluke 1735 is a sensible, professional-grade three-phase logger for energy and basic power-quality work, and the NIST-traceable calibration makes its data easy to defend. Based on the manufacturer’s documented features rather than my own bench testing, it looks well matched to auditors and facilities engineers who need evidence over time. Just buy it for what it is: a logger you install and leave, not a handheld for quick checks, and confirm it meets your standard if your power-quality work has to be certification-grade.
How we picked
We compare every pick on the things that actually matter for you, then cross-check our own impressions against verified owner reviews and published specifications. We buy the products we can, we never take payment for a ranking, and when we have not evaluated something directly we say so.
Top picks compared
| Pick | Best for | Score | |
|---|---|---|---|
| Fluke 1735 | Check price |
Our picks up close
Fluke 1735
Where it shines
- Your unit is calibrated prior to shipment with a new nist-traceable calibration Certificat
- The NIST calibration provides you assurance your instrument Meets manufacturer’s specifica
- Prove the benefit of efficiency improvements with energy consumption tests
- Measure Harmonic distortion caused by electronic loads
- Improve reliability by capturing Voltage dips and swells from load switching
Where it falls short
- No real-time PC streaming, data is logged then downloaded
- Limited transient and harmonics depth versus Fluke 174x class analyzers
- Flexible current probes are an added cost on top of the base kit
Before you buy
Measurement Accuracy
Look for a logger with high basic accuracy on voltage and current measurements, typically within 0.5% or better. This ensures reliable data for energy consumption analysis and identifying power quality issues without needing frequent recalibration.
Data Logging Capacity
Consider the internal memory and logging interval flexibility. A good unit should store weeks of data at user-defined intervals, such as 1 second to 1 hour, so you can capture transient events or long-term trends without constant downloads.
Input Safety Rating
Check the CAT rating (e.g., CAT III 600V) to ensure safe use on industrial or commercial panels. A higher safety rating protects both the user and the instrument from voltage spikes and arc flash risks during live measurements.
Ease of Setup
Prioritize models with color displays and intuitive menu navigation for quick configuration. A straightforward setup reduces wiring errors and saves time, especially when working in tight spaces or with unfamiliar panel layouts.
The wrap-up
The Fluke 1735 is the standout three-phase power logger for its rugged build, intuitive setup, and ability to simultaneously log voltage, current, power, and harmonics, making it ideal for energy audits and troubleshooting without complex wiring.
Quick answers
Yes, the Fluke 1735 can log power factor, harmonics up to the 50th order, and other power quality parameters alongside voltage and current. This allows you to analyze both energy use and waveform distortion in one session, saving time on troubleshooting.
The Fluke 1735 uses flexible current probes (iFlex) or standard clamp-on CTs with a 1 mV/A or 10 mV/A output. These allow measurement on large conductors or tight spaces. Ensure the probes are rated for your expected current range to avoid saturation.
You can transfer data via USB or optional SD card. The included Fluke Energy Analyze Plus software lets you download logged data, create reports, and export to CSV. For remote monitoring, some models support Ethernet or Wi-Fi adapters.
Yes, the Fluke 1735 can be configured for single-phase, split-phase, or three-phase systems. You simply select the wiring mode during setup. It will log all connected phases, but for single-phase you only need to connect one voltage and one current input.
The Fluke 1735 can log continuously for up to 45 days at 1-minute intervals with the included SD card. For longer studies, use a larger SD card or extend the interval. Battery life also supports several days of logging before needing a recharge.
