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Brand: Fluke
Fluke 435-II Three-Phase Power Quality Analyzer, Class A
Description
Fluke 435-II three-phase power quality and energy analyzer, IEC 61000-4-30 Class A
The Fluke 435-II is a handheld three-phase power quality and energy analyzer that measures to IEC 61000-4-30 Class A and adds transient capture, flicker, mains signalling and PowerWave recording to the functions found on the entry model of the 430 Series II. It sits in the middle of the series: the 434-II is the Class S model, the 435-II is Class A, and the 437-II is Class A with 400 Hz support. Seven Star LLC supplies the 435-II in Oman and the GCC as an independent supplier in Muscat, and this page lists the functions and the specification points that matter when you request a quotation.
How the 435-II differs from 434-II and 437-II
According to the selection table in the data sheet, all three models offer volts, amps and hertz, dips and swells, harmonics, power and energy, the energy loss calculator, unbalance, monitor mode, inrush and power inverter efficiency. The 435-II and 437-II add event waveform capture, flicker, transients, mains signalling and PowerWave. The 437-II alone adds 400 Hz measurement for avionic and military supply systems and ships with a hard case with rollers, while the 434-II and 435-II come with the C1740 soft case. The 435-II also has better voltage accuracy than the 434-II: ±0.1 percent of nominal voltage compared with ±0.5 percent.
Technical specifications of the 435-II
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Fluke / 435-II |
| Standard compliance | IEC 61000-4-30 Class A |
| Voltage inputs | 4 inputs (3 phase + neutral), dc-coupled, up to 1000 Vrms, nominal range 1 … 1000 V; 6 kV peak in transient mode |
| Current inputs | 4 inputs, 0.5 … 600 A or 5 … 6000 A with the included i430-Flex thin flexible probes; mV-output clamps and CTs supported |
| Sampling | 16-bit, 200 kS/s on each of 8 channels simultaneously |
| Bandwidth | Above 10 kHz; up to 100 kHz in transient mode |
| Voltage accuracy | ±0.1 % of nominal voltage |
| Current accuracy | ±0.5 % ± 5 counts (excluding clamp accuracy) |
| Frequency | 50 Hz and 60 Hz nominal, resolution 0.001 Hz, ±0.01 Hz |
| Harmonics | DC, 1st … 50th; interharmonics |
| Power and energy | Watts, VA, var, PF, DPF, energy loss with user-set cost per kWh |
| Logger | Up to 150 PQ parameters on 4 phases; memory for up to 600 parameters at user intervals per the family description |
| Monitor | EN 50160 parameters on one screen with IEC 61000-4-30 flagging |
| Transients | Waveform capture on 4 voltage and 4 current channels, triggers on Vrms½, Arms½, Pinst |
| Safety | 600 V CAT IV / 1000 V CAT III |
| Battery | Li-ion BP290, up to 8 hours operating time |
| Storage | SD card, 8 GB supplied (maximum 32 GB) |
| Included accessories | TL430 test lead set, 4 x i430 thin flexible current probes, BP290 battery, BC430 power adapter, USB cable, PowerLog software |
Measurement modes of the 435-II
- Scope, phasor and meter views: four voltage and four current waveforms, vector diagram and tabulated readings, with trend graphs and cursors.
- Dips and swells: Vrms half-cycle, Arms half-cycle and instantaneous power with programmable thresholds.
- Harmonics: harmonic volts, THD, harmonic amps, K-factor and harmonic watts to the 50th.
- Unbalance: negative and zero sequence percentages and phase angles.
- Inrush: inrush current and duration for motor starts.
- Monitor: parameters measured simultaneously according to EN 50160, with flagging under IEC 61000-4-30.
- Flicker, transients, mains signalling and PowerWave: available on the 435-II and 437-II only.
Energy loss calculator and power inverter efficiency
The patented Unified Power Measurement method separates classical active and reactive power from unbalance and harmonic power and quantifies the loss caused by reactive power, unbalance, harmonics and neutral current. Together with the user-entered cost per kWh, the calculator reports the cost of wasted energy, which helps justify a harmonic filter, a power factor correction bank or load rebalancing. Optional dc clamps allow the analyzer to measure ac output power and dc input power at the same time to calculate inverter efficiency, relevant for solar and UPS systems.
Selection and ordering checklist for the 435-II
- Class: Class A required (435-II or 437-II) or Class S sufficient (434-II).
- Need for transient capture up to 6 kV, flicker or mains signalling.
- Probe range: the included i430-Flex probes cover 0.5 … 600 A and 5 … 6000 A; additional ac or dc clamps are optional.
- Supply frequency: 50 or 60 Hz (435-II) or 400 Hz (437-II).
- Software and reporting, and the memory card needed for long studies.
- Calibration certificate and traceability requirement.
Connecting and commissioning the analyzer
Connect the voltage leads and current probes, enter the nominal voltage and system type, and check phase relationships on the phasor screen before logging. Set thresholds for dips, swells and inrush according to the study, and start logging so that trends and events are recorded together. The analyzer is rated for 600 V CAT IV and 1000 V CAT III, but the rating depends on the use of the correct probes and leads and on the site safety rules. Keep the Li-ion battery charged for long unattended studies or power the instrument from the adapter.
Typical applications in Oman and the GCC
The 435-II is used for troubleshooting nuisance trips, motor-start sags, harmonic heating and capacitor bank resonance in plants with many drives, for supply quality acceptance tests on generators and transformers, for checks after UPS or generator transfers and for solar plant commissioning. Facilities with high cooling loads, long cable runs and weak local grids benefit from the Class A measurements when a dispute about supply quality must be documented.
Information to send with an RFQ for the 435-II
- Model: 435-II (or 434-II or 437-II), kit and probe size
- System voltage and frequency
- Study type (power quality, energy loss, transients)
- Calibration certificate requirement
- Quantity and delivery site
Documents and quotation
The Fluke 430 Series II technical data sheet is attached on this page. It includes the selection table and the complete accuracy tables.
Send the model and the application and Seven Star LLC will confirm availability and prepare a quotation.
Datasheets & Documents
- Datasheet Fluke 435-II Datasheet Download
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About brand
Fluke is the American maker of handheld electronic test tools: digital multimeters, clamp meters, insulation testers, process calibrators, thermometers, vibration meters and power quality analysers. John Fluke founded the John Fluke Engineering Company in Springdale, Connecticut, in June 1948 and moved it to Seattle in 1952. Fluke is headquartered in Everett, Washington, was acquired by Danaher in 1998 and has been part of Fortive since Fortive's spin-off from Danaher in 2016.
Seven Star LLC lists Fluke process calibrators, electrical test tools and bench calibrators, and sources them for maintenance teams and calibration laboratories in Oman.
Fluke company profile
| Founded | June 1948, Springdale, Connecticut, USA, as the John Fluke Engineering Company |
|---|---|
| Founder | John M. Fluke Sr. |
| Headquarters | Everett, Washington, USA (moved to the Seattle area in 1952) |
| Ownership | Danaher from 1998; part of Fortive (NYSE: FTV) since July 2016 |
| Product families | Digital multimeters and clamp meters, insulation resistance testers, process and loop calibrators, infrared thermometers and thermal imagers, vibration meters, power quality analysers, Fluke Calibration laboratory standards |
Milestones
- 1948: John Fluke starts the company in Springdale, Connecticut.
- 1952: The company moves to Seattle
- 1987: A joint venture with Philips leads to the ScopeMeter handheld oscilloscope.
- 1998: Danaher acquires Fluke.
- 2016: Fluke becomes part of Fortive, spun off from Danaher in July.
Fluke calibrators and test tools listed
The main Fluke products on this page fall into three groups, besides other test tools such as further multimeters, a thermometer, an anemometer, a vibration tester and a portable appliance tester:
- Process tools: the 754 documenting process calibrator with HART, 789 ProcessMeter, 721 dual sensor pressure calibrator and 729 automatic pressure calibrator
- Electrical test: the 376 FC true-RMS clamp meter with iFlex probe and the 1587 FC insulation multimeter
- Fluke Calibration bench standards: 5522A, 5502A, 5500A and 5080A multi-product calibrators, the 5720A multifunction calibrator, 8508A reference multimeter, 6100A electrical power standard and 9640A RF reference source
Several of the bench models belong to earlier generations. When a model is no longer produced, we check the manufacturer's documentation and propose the successor it names.
Where Fluke instruments are used
Fluke process calibrators are used for loop checks, transmitter calibration and valve tests in oil and gas, power and water plants. Clamp meters and insulation testers serve electrical maintenance on motors, switchgear and cables. The bench calibrators and reference multimeters are the working standards of electrical calibration laboratories in the GCC, where they calibrate multimeters, clamp meters, process tools and power analyzers.
Fluke products we list
Ordering Fluke instruments: what we need
Send the exact model with its suffix, since versions differ. A Fluke 721, for example, is defined by its two pressure ranges, and a 729 by its maximum pressure. For bench calibrators, list the options you need, such as oscilloscope calibration or power quality options, the line voltage, and the type of calibration certificate you require from the manufacturer. For Fluke multimeters and clamp meters, add the kit contents wanted, such as probes, leads or cases.
Facts checked against published histories of Fluke Corporation and Fortive, October 2026.
Browse Fluke products by category: Portable Test & Measurement.
FAQ
Questions about the Fluke 435-II Three-Phase Power Quality Analyzer,
Answers from our engineering team on installation, compatibility and integration.
01What standard does the Fluke 435-II meet?
The 435-II complies with IEC 61000-4-30 Class A. The 434-II in the same series is Class S.
02What does the 435-II have that the 434-II does not?
It adds event waveform capture, flicker, transients, mains signalling and PowerWave, and it has tighter voltage accuracy.
03What current probes are included?
Four thin flexible i430-Flex probes, covering 0.5 to 600 A or 5 to 6000 A depending on sensitivity.
04How long does the battery last?
The data sheet states up to 8 hours of operating time per charge on the Li-ion battery pack.
05What is the safety rating?
The analyzer is rated 600 V CAT IV and 1000 V CAT III.
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