Fluke 1664FC Multifunction Tester

  • Protects the installation using Fluke's Insulation pretest feature
  • Save time with auto-test, simultaneous testing, a zero adapter and Z-max memory
  • Fluke Connect and FlukeCloud allow remote access to results via smartphone
More Info
inc VAT £1,078.80 ex VAT £899.00
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Product Details

Fluke 1664FC Multifunction Tester

The Fluke 1664FC Multifunction Tester can be used to test electrical systems quickly and safely. It can take readings for True RMS AC voltage, insulation resistance, loop and line impedance (ZI), prospective earth fault current, RCD tripping speed, earth resistance, and RCD/FI tripping current. Other tests include continuity testing, RCD testing, and ramp testing whilst phase sequence indication constitutes another useful feature of the instrument. All measurement and testing is carried out to a high standard of accuracy over impressive ranges and the user also benefits from auto-testing for line/loop impedance, RCD trigger test, and insulation tests. Auto-testing requires the user to set just one connection and push one button, thus saving time.

Other time-saving features include Z-max memory for loop tests and a zero adapter for lead and cord compensation. Moreover, there is no need to switch connections in order to measure voltages between a variety of different points and the user interface is incredibly simple with straighforward dial operation no confusing menus. In addition, the Fluke 1664FC boasts unique ‘Insulation PreTest’ which prevents testing and therefore any subsequent damage when it detects appliances connected to the object system. This combines with Earth Volt Touchpad, which highlights raised earth voltages, to create a very safe instrument with a Cat III 500V overvoltage categorisation. It is therefore an accurate, safe, and speedy tester. Most usefully, the Fluke 1664FC's auto-test sequence performs five tests and thereby ensures that installations meet local regulations.

The Fluke 1664FC benefits from Fluke Connect technology. After the Fluke Connect app is downloaded from the App Store or Google Play, this allows results to be sent to a smartphone to then be forwarded on to fellow team members and uploaded to the FlukeCloud database from where they can be accessed via internet connection from anywhere in the world. Information is also shown on the clear LCD screen. The Fluke 1664FC multifunction tester is compact, durable and portable and comes supplied with a padded neck strap, test leads, a fused test probe set, a remote probe, batteries, a C1600 hard carry case, a zero adapter, a heavy duty mains cable, a calibration certificate and a user’s manual/CD.

Fluke part number: FLK-1664FC

Fluke Connect App

The free Fluke Connect App is available on both Android and iOS smartphones and tablets and allows the user to instantly upload results from Fluke smart devices to the FlukeCloud database. This database can be accessed via the app from anywhere in the world so it not only provides a handy, smart database, it also allows colleagues to check and analyse data even when they are not on site.

Fluke 1664FC Multifunction Tester Key Features

  • Insulation test voltages of 50V, 100V, 250V, 500V and 1000V DC
  • Measurement of AC voltage, insulation resistance, loop and line impedance (ZI)
  • Measurement of prospective earth fault current, tripping speed, earth resistance, and RCD/FI tripping current
  • Continuity testing, RCD testing, and ramp testing
  • Time-saving auto-test function
  • Insulation PreTest detects appliances to avoid damage
  • Earth Volt Touchpad detects high earth voltage
  • Cat III to 500V, Cat IV to 300V Safety ratings
  • Fluke Connect and FlukeCloud connectivity with smartphones
  • Supplied with all necessary accessories including a remote probe and an FTP fused test probe set
  • Well-built with light, portable design
What's In The Box?
  • Fluke 1664 FC Multifunction Installation Tester
  • CD and instruction manual for Fluke 1664 FC Multifunction Installation Tester
  • 6 x AA batteries
  • C1600 hard carry case
  • Zero adapter
  • Heavy duty mains power cord
  • Standard test lead set with crocodile clips
  • Remote probe
  • Fluke FTP fused test probe set
  • Padded carrying waist and neck strap
  • 1664FC Quick reference guide
  • Fluke calibration certificate
More Information

AC voltage measurement

  • Range: 500V
  • Resolution: 0.1V
  • Accuracy 45Hz - 66Hz: 0.8% + 3 counts
  • Input impedance: 360kΩ
  • Overload protection: 660V rms

Continuity testing RLO

  • Range (autoranging): 20Ω / 200Ω / 2000Ω
  • Resolution: 0.01Ω / 0.1Ω / 1Ω
  • Open circuit voltage: >4V

Insulation resistance measurement

  • Test voltages:  50-100-250-500-1000V
  • Accuracy of tTest voltage (at rated test current): +10%, -0%
  • Test voltage: 50V; 100V; 250V; 500V; 1000V
  • Insulation resistance range: 20 to 50MΩ; 20 to 100MΩ; 20 to 200MΩ; 20 to 200 to 500MΩ; 20 to 200 to 1000MΩ
  • Resolution: 0.01MΩ / 0.1MΩ; 0.01MΩ / 0.1MΩ; 0.01MΩ / 0.1MΩ; 0.01MΩ / 0.1MΩ / 1MΩ; 0.01MΩ / 0.1MΩ / 1MΩ
  • Test current: 1mA @ 50kΩ; 1mA @ 100kΩ; 1mA @ 250kΩ; 1mA @ 500kΩ; 1mA @ 1MΩ

Loop and line impedance (ZI)

  • Range: 10Ω / 0.001Ω / High current mΩ mode
  • Resolution: 0.01Ω / 0.1Ω / 1Ω

Prospective earth fault current, PSC test

  • Range: 1000A / 10kA (50kA)
  • Resolution: 1A / 0.1kA
  • Computation: Prospective earth fault current (PEFC) or prospective short current (PSC) calculated by splitting actual mains voltage by measured loop (L-PE) resistance or line (L-N) resistance respectively

RCD testing, RCD types tested

  • RCD type: AC1; G2, S3
  • Model 1664: A, AC, B5, S

Notes: 1Responds to AC; 2General no delay; 3Time delay; 4Responds to pulsed signal; 5Responds to smooth DC signal.

Tripping speed test (ΔT)

  • Current settings1: 10-30-100-300-500-1000mA - VAR; 10-30-100mA
  • Multiplier: x0.5, x 1; x5
  • Measurement range: 310ms, 50ms (RCD Type G); 510ms, 160ms (RCD Type)

Notes: 1000mA with type AC only, 700mA maximum type A in VAR mode, VAR mode not available for type B

RCD/FI-Tripping Current Measurement/Ramp Test (IΔN)

  • Current range: 30% to 110% of RCD rated current1
  • Step size: 10% of IΔN2
  • Dwell time: 300ms/step (Type G); 500ms/step (Type S)
  • Measurement accuracy: ±5%
  • Specified trip current ranges (EN 61008-1): 50% to 100% for Type AC; 35% to 140% for Type A (>10 mA); 35% to 200% for Type A (≤10 mA); 50% to 200% for Type B; ²5% for Type B

Notes: ¹30% to 150% for Type A IΔN > 10 mA; 30% to 210% for Type A IΔN = 10 mA; 20% to 210% for Type B

Earth Resistance Test (RE)

  • Range: 200Ω / 2000Ω
  • Resolution: 0.1Ω / 1Ω
  • Frequency: 128Hz
  • Output voltage: 25V


  • Size (L x W x H): 10 x 25 x 12.5cm
  • Weight (incl. batteries): 1.3kg
  • Batteries:  6 x AA
  • Sealing: IP-40
  • Safety: Meets requirements for EN61010-1 Ed 2.0 (2001-02), UL61010, ANSI/ISA –s82.02.01 2000 and CAN/CSA c22.2 No. 1010 2nd edition
  • Overvoltage: Cat III to 500V; Cat IV to 300V
  • Performance: EN61557-1 to EN61557-7 Second Edition and EN61557-10 Second Edition

Fluke Connect

  • Fluke connect is compatible with operating systems iOS 8 and above or on Android 4.4.x or above
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