Fluke 1674FC SCH Multifunction Installation Tester

The Fluke 1674 FC SCH, reference 5580841, is a professional multifunction tester for verifying residential, commercial, and industrial electrical installations. As the highest-performance model in the Fluke 1670 series, it combines in a single instrument tests for voltage, continuity, insulation, loop and line impedance, prospective fault and short-circuit current, RCDs, earth resistance, phase sequence, voltage drop, SPD surge protection devices, and IMD insulation monitoring devices.

The 1674 FC features a color touchscreen, Auto Test sequences, Fluke Connect wireless connectivity, structured project management, and the exclusive Insulation PreTest function. It also adds loop and line impedance measurement with a resolution of up to 0.001 ohms, a model-specific feature within the 1670 series.

Fluke 1674 FC: the most complete model in the 1670 series

The Fluke 1674 FC is designed for installers, electricians, maintenance technicians, and inspectors who need to perform and document a wide range of tests on low-voltage installations.

In addition to the functions available in the Fluke 1673 FC, the 1674 FC includes specific features such as:

• Insulation PreTest: a safety pre-check before carrying out an insulation test.
• 1 milliohm resolution: for loop and line impedance measurements in the corresponding range.
• SPD device test: using a varistor RAMP test.
• IMD device test: in accordance with IEC 61557-8.
• Auto Test: automated test sequences.
• Fluke Connect: wireless transfer and management of results.

Insulation PreTest function to protect connected equipment

One of the standout features of the 1674 FC is the patented Insulation PreTest function. Before performing an insulation test, the tester can detect the presence of equipment connected to the installation.

If it identifies devices that could be affected by the test voltage, the Fluke 1674 FC stops the test and issues a visual and audible warning. This helps prevent accidental damage to electronic equipment and other connected loads.

To use this pre-check, the phase, neutral, and protective conductors must be connected to the instrument.

Insulation resistance tests up to 1,000 volts

The tester allows different test voltages to be selected to suit the circuit or equipment being verified.

• Test voltages: 50, 100, 250, 500, and 1,000 volts.
• Range at 50 volts: from 10 kiloohms to 50 megaohms.
• Range at 100 volts: up to 100 megaohms.
• Range at 250 volts: up to 200 megaohms.
• Range at 500 volts: up to 500 megaohms.
• Range at 1,000 volts: up to 1,000 megaohms.

The inclusion of the 50-volt test makes it possible to carry out checks in applications where a reduced test voltage is required.

SPD surge protection device test

The Fluke 1674 FC includes a dedicated function for testing SPD surge protection devices using a RAMP insulation test for varistors in accordance with IEC 61643-11.

• Test ramp: 0 to 500 volts.
• Test ramp: 0 to 1,000 volts.
• Resolution: 1 volt.
• Test current: 1 milliamp.
• Accuracy: ±1.5% plus 3 digits.

This function makes it possible to include the verification of certain surge protectors in the overall installation testing process without needing a separate instrument for this test.

IMD insulation monitoring device test

The 1674 FC model can test IMD insulation monitoring devices in accordance with IEC 61557-8.

• Range from 1 to 10 kiloohms: 1 kiloohm resolution.
• Range from 10 to 100 kiloohms: 10 kiloohm resolution.
• Range from 100 kiloohms to 3 megaohms: 100 kiloohm resolution.

This feature expands the instrument’s capabilities in installations that use permanent insulation monitoring systems.

Auto Test to speed up checks

The Fluke 1674 FC includes the Auto Test function, which allows a complete test sequence to be run with a single setup.

The instrument also provides automatic measurement validation and allows limits to be set for an immediate visual indication of the result.

The built-in help displays connection diagrams on screen to make it easier to set up each test correctly.

Loop and line impedance with 1 milliohm resolution

A particularly important difference compared with the 1673 FC is the ability to measure loop and line impedance with a resolution of up to 0.001 ohms in the 10-ohm range.

• 10-ohm range: 0.001-ohm resolution.
• 20-ohm range: 0.01-ohm resolution.
• 200-ohm range: 0.1-ohm resolution.
• 2,000-ohm range: 1-ohm resolution.

The unit offers high-current and no-trip test modes for testing circuits protected by residual current devices.

PEFC and PSC up to 50 kiloamps

Based on the voltage and measured impedance, the instrument calculates prospective earth fault current PEFC and prospective short-circuit current PSC.

• Range: 0 to 50 kiloamps.
• Resolution below 1,000 amps: 1 amp.
• Resolution from 1,000 amps: 0.1 kiloamp.

The instrument can display impedance and calculated prospective current simultaneously, making it easier to assess circuit protection.

Advanced RCD testing

The Fluke 1674 FC offers broad coverage for testing residual current devices, including models sensitive to different residual current waveforms.

• Type AC RCD.
• Type A RCD.
• Type F RCD.
• Type B RCD.
• Type B+ RCD.
• RDC-DD for 6 mA DC residual currents.
• A/EV RCD.
• B/Mi RCD.
• GFCI.
• General and selective devices depending on the RCD type.

The instrument allows trip time tests, ramp trip current tests, and automatic sequences for different rated values.

Earth resistance test

The 1674 FC includes a function for measuring earth resistance.

• Range: 200 ohms.
• Resolution: 0.1 ohms.
• Range: 2,000 ohms.
• Resolution: 1 ohm.
• Test frequency: 128 hertz.
• Output voltage: 25 volts.

The specific accessories required for certain earth measurement configurations must be selected according to the test method used; the standard kit for reference 5580841 does not include a Fluke 1630-2 FC clamp.

Voltage and frequency measurement

The tester can measure AC and DC voltage, as well as frequency.

• Voltage range: up to 600 volts.
• Resolution: 0.1 volts.
• Input impedance: 320 kiloohms.
• Overload protection: 660 volts.
• Frequency range: 45 to 66 hertz.
• Frequency resolution: 0.1 hertz.

With the appropriate mains lead, it can display phase-to-neutral, phase-to-earth, and neutral-to-earth voltages simultaneously.

Continuity test

The Fluke 1674 FC can verify protective conductors, equipotential bonding, and other low-resistance circuits.

• Auto ranges: 20, 200, and 2,000 ohms.
• Resolutions: 0.01, 0.1, and 1 ohm.
• Open-circuit voltage: greater than 4 volts.

It also includes continuity testing with a reduced 10 mA current, indicated by Fluke, among other applications, for measuring motor windings.

Voltage drop measurement

The tester includes voltage drop calculation based on line impedance measurement and the rated current entered.

• Range: 0.0 to 99.9%.
• Resolution: 0.1%.

Phase sequence test

In three-phase installations, the instrument can verify phase sequence.

• Range: 185 to 600 volts.
• Correct sequence: 1-2-3 indication.
• Reverse sequence: 3-2-1 indication.

Color touchscreen and rotary selector

The unit features a high-resolution full-color touchscreen combined with a physical rotary selector. The user can select functions directly on the screen or use the selector to navigate between the different test modes.

The interface provides visual instructions and connection diagrams to make measurement setup easier.

Structured project management

The Fluke 1674 FC allows results to be organized in a hierarchical structure that makes documentation of large installations easier.

• Customers.
• Sites.
• Distribution boards.
• Circuits.
• Test points.

Data can be edited directly on the instrument and transferred between the tester, compatible mobile devices, and a computer.

Integrated Fluke Connect

Fluke Connect wireless connectivity allows measurement results to be synchronized with the compatible mobile app.

From Fluke Connect, it is possible to prepare projects, boards, and circuits, transfer them to the tester, and attach photos and notes to specific test points or assets.

The unit can also receive results from other instruments compatible with the Fluke Connect ecosystem to centralize installation documentation.

Compatible with Fluke TruTest

Results obtained with the Fluke 1674 FC can be used with Fluke TruTest to manage data and prepare test certificates and reports.

Communication with TruTest can be carried out via USB-C or through the Fluke Connect data flow, depending on the configuration used.

Important: reference 5580841 corresponds to the standard Fluke 1674 FC and does not include Fluke TruTest software. Fluke sells specific variants that include the software package.

Z Max memory

The instrument includes a Z Max function to store the maximum value obtained during loop impedance tests, making it easier to review results later.

Rechargeable lithium-ion battery

The Fluke 1674 FC uses a BP290 rechargeable lithium-ion battery and can be charged via its USB-C connection.

• Battery model: BP290.
• Technology: lithium-ion.
• Voltage: 10.8 volts.
• Capacity: 2,500 milliamp hours.
• Energy: 27 watt hours.
• Charging: USB-C.

The USB-C port is also used for data transfer and firmware updates.

CAT III 600 V and CAT IV 300 V

The tester is designed for professional work on electrical installations and has the following measurement categories:

• CAT III: 600 volts.
• CAT IV: 300 volts.
• Safety standards: IEC/EN 61010-1, IEC 61010-2-030, and IEC 61010-2-034.
• Performance standards: IEC 61557-1 to IEC/EN 61557-8 and IEC 61557-10.

The unit also provides visual and audible warnings when it detects voltages above 50 volts.

IP40 protection and portable format

• Protection rating: IP40 according to IEC 60529.
• Width: 262.5 millimeters.
• Height: 141.9 millimeters.
• Depth: 119.3 millimeters.
• Weight with battery: 1.6 kilograms.

Its portable format, rechargeable battery, and strap make it suitable for testing work on distribution boards, circuits, and different points of an installation.

Accessories included with the Fluke 1674 FC 5580841

The standard reference 5580841 includes:

• Fluke 1674 FC multifunction tester.
• High-performance mains lead with single input connector.
• Hard carrying case.
• USB-C power adapter for charging.
• Remote control probe.
• Hanging strap.
• Zeroing or compensation adapter.
• Test leads and probes.
• Alligator clips.
• Rechargeable lithium-ion battery.

Fluke TruTest software and the Fluke 1630-2 FC earth clamp are not part of the standard supply for reference 5580841.

Technical specifications of the Fluke 1674 FC SCH 5580841

• Brand: Fluke.
• Series: 1670.
• Model: 1674 FC SCH.
• Reference: 5580841.
• Type: electrical installation multifunction tester.
• Display: full-color touchscreen.
• Auto Test: yes.
• Automatic result validation: yes.
• Insulation PreTest: yes.
• Fluke Connect: yes.
• Interface: USB-C and Bluetooth Low Energy.
• SPD test: yes, using RAMP test.
• IMD test: yes, in accordance with IEC 61557-8.
• Measured voltage: up to 600 volts.
• Frequency: 45 to 66 hertz.
• Insulation test voltages: 50, 100, 250, 500, and 1,000 volts.
• Insulation resistance: up to 1,000 megaohms.
• Continuity: 20, 200, and 2,000 ohms.
• Minimum loop/line impedance resolution: 0.001 ohms.
• PEFC and PSC: up to 50 kiloamps.
• Voltage drop measurement: 0.0 to 99.9%.
• RCD tests: AC, A, F, B, B+, RDC-DD, A/EV, B/Mi, and GFCI depending on the test.
• Earth resistance test: yes.
• Earth resistance ranges: 200 and 2,000 ohms.
• Phase sequence: 185 to 600 volts.
• Z Max memory: yes.
• Compatible with Fluke TruTest: yes; software not included in reference 5580841.
• Battery: BP290 lithium-ion.
• Capacity: 2,500 milliamp hours.
• Energy: 27 watt hours.
• Safety category: CAT III 600 volts / CAT IV 300 volts.
• Protection: IP40.
• Dimensions: 262.5 × 141.9 × 119.3 millimeters.
• Weight with battery: 1.6 kilograms.

Advanced tester for installation, inspection, and documentation

The Fluke 1674 FC SCH 5580841 combines the main tests needed to verify an electrical installation in a single unit and adds advanced functions such as Insulation PreTest, 1 milliohm resolution, SPD and IMD testing, B/B+ RCD tests, and Fluke Connect connectivity.

Its combination of touchscreen, Auto Test, rechargeable battery, structured project management, and wireless connectivity makes it possible to carry out on-site checks and keep results organized for later documentation, making it a particularly complete solution for installers and professional technicians.