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Fluke 1621 Earth Ground Tester

Fluke 1621
Catalog #: 2840276
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  • 3-pole Fall-of-Potential earth testing for basic measurements
  • 2-pole resistance measurements for added versatility
  • Easily capture values with single-button operation
  • Ensure accurate measurements with automatic ‘noise’ voltage detection
  • Hazardous voltage warning offers increased user protection
  • Clearly read and record data with a large, backlit display
  • Rugged holster and design for tough work environments
  • Portable size allows for easy transportation
  • Instantly be alerted to measurements outside of your set limit, when you use the adjustable limit setting
  • 600 V Cat II
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Fluke 1621 Earth Ground Tester

Fluke 1621 Earth Ground Tester

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Product Information

Fluke 1621 Earth Ground Tester for resistance measurement

The Fluke 1621 a is an easy-to-use earth ground tester. For ground resistance testing, the 1621 is the first line of defense in detecting reliable ground connections. The unit features basic ground testing methods including 3-pole Fall-of-Potential as well as 2-pole ground resistance tests. Its convenient size, rugged holster, and large, clear LCD display make it an ideal field earth ground tester, for most electrical grounding work environments. With a simple user interface and intuitive functionality, the Fluke 1621 is a handy grounding tool for electrical contractors, utility test engineers, and earth ground specialists.

Fluke 1621 Kit Application shot for Utility Troubleshooters Application for Target Users:
  • Field Service Electricians
  • Electrical Contractor
  • Earth Ground Specialists
  • Industrial Maintenance Electricians
  • Industrial Maintenance Technicians
  • Electrical Utility Maintenance
  • Substation Maintenance
  • Cell / Radio / Microwave Maintenance
  • Lightning Protection Specialists
  • Utility Special Testers
  • Utility Troubleshooters

What's In The Box

  • Users manual
  • Two measuring leads with alligator clips, 2 m (6 ft)
  • One battery, 9 V alkaline (LR61)
  • One protective holster, yellow
  • One CD-ROM


General specifications
Measuring functions 3-pole earth ground resistance, 2-pole ac resistance of a conductor, Interference voltage
Intrinsic error Refers to the reference temperature range and is guaranteed for one year
Measuring rate 2 measurements/second
Battery[1] One 9 volt alkaline (LR61)
Battery condition LO-BAT is displayed if voltage drops below 6.5 V
Voltages Between jacks H/C2 and E/C1: 250 Veff maximum (effective voltage)
Between jacks S/P2 and E/C1: 250 Veff maximum
Standard infrared lens type Field of view: 17° x 17°
Spatial resolution: (IFOV) 2.50 mRad
Minimum focus distance: 15 cm (approx. 6 in)
Climatic class VDE/VDI 3540 RZ (conforming to KWG as per DIN 40040, 4/87)
Temperature performance[2]
Working: -10 °C to +50 °C (+14 °F to +122 °F)
Operating: 0 °C to +35 °C (+32 °F to +95 °F)
Storage: -20 °C to +60 °C (+68 °F to +140 °F)
Reference: +23 °C ± 2 °C (+73 °F ± 4 °F)
Temperature coefficient ± 0.1 % of range per degree Kelvin
Safety IEC/EN 61010-1, 600 V CAT II, pollution degree 2
Dimensions 113 mm x 54 mm x 216 mm (4.5 in x 2.1 in x 8.5 in), including holster
Weight 850 g (1.9 lb), including standard accessories, volume approximately 600 cm3
Note: [1]If the tester is not going to be used, or is being stored for a long period, remove the battery and store separately from the tester to avoid damage from battery leakage.
[2]The four temperature ranges for the tester exists to satisfy European Standards requirements; the instrument can be used over the full working temperature range by using the temperature coefficient to calculate accuracy at the ambient temperature of use.
Electrical specifications
Maximum deviations: E1 Influence factor Position
E1 Deviation influence 0 %
E2 Influence factor Supply voltage
E2 Deviation influence 0 %
E3 Influence factor Temperature E3
E3 Deviation influence 2.3 %
E4 Influence factor Serial interference voltage (20 V)
E4 Deviation influence 0.6 %
E5 Influence factor Probe- and auxiliary probe resistance
E5 Deviation influence 10 %
Test voltage 3.7 kV
Protection type IP 40; IEC/EN 60529
Electromagnetic compatibility Emission: IEC/EN 61326 Class B
Immunity: IEC/EN 61326 Annex C
RE resistance measurement
Measuring method Current-voltage measurement with improved cross-talk attenuation, no compensation of measuring lead resistance, with probe (3-pole) or without probe (2-pole), as per IEC/EN 61557-5
Open circuit voltage 23 to 24 V ac
Short circuit current > 50 mA ac
Measuring frequency 128 Hz
Maximum permissible overload 250 Veff
Measuring time 8 seconds (average from when START is pressed)
Limit input Tester retains set value even if instrument is turned off (assuming battery power supply is sufficient)
Automatic changeover of resolution RH < 7 k Ω
Resolution 0.01 Ω
RH < 50 kΩ
Resolution 0.1 Ω
RH > 50 kΩ
Resolution 1 Ω
Interference voltage display dc + ac Vmax 30 Veff
Common mode rejection > 80 dB at 50 Hz and 60 HzM
Ri 680 kΩ
Measuring uncertainty < 10 % for pure ac and dc signals
Measuring range
0.15 Ω to 20 Ω Resolution 0.01 Ω
Display range 0 to 19.99 Ω
200 Ω Resolution 0.1 Ω
Display range 20 to 199.9 Ω
2 k Ω Resolution 1 Ω
Display range 200 to 1999 Ω
Intrinsic uncertainty ± (6 % of measured value + 5D)
Operating uncertainty IEC 61557[1] ± (18 % of measured value + 5D)
Notes: [1] Covers all deviations caused by influence quantities E1-E5. If the deviation E4 caused by high probe or auxiliary probe resistance is higher than specified flashes. Measured values are outside of the specified operating uncertainty

Fluke 1621 Product Specifications Summary:
(for full specs please see the full specs tab or the data sheet)

Ground Testers/3 Pole / 4 Pole Ground Testers Template

Type What's This?3 Pole
Display (3 Pole Testers) What's This?Digital
Ground Resistance Range What's This?2 K Ohms
AccuracyIntrinsic uncertainty +/- 6% of measured value + 5D.
Operating uncertainty IEC 61557 +/- 18% of measured value + 5D 
Measuring Current50 mA
Measuring Voltage What's This?24 V
Measuring Frequency What's This?128 Hz
Soil Resistivity What's This?No
Stakeless Capability What's This?No
Power SupplyBattery
CAT Rating What's This?II
CAT Voltage What's This?600 V
Optional Ground Kit Included What's This?No
Auto Ranging What's This?Yes

Test Equipment General Attributes

Unique Features- 3 pole and 2 pole methods
-Easily capture values with single-button
-More accurate measurements with auto 'noise' voltage detection
Warranty2 YEARS
Power Supply VoltageBattery Powered
Data Logging What's This?No
IP Rating What's This?IP40
Product Weight1.9 LBS
Battery Type9v
Product Height8.5 IN
Product Length4.5 IN
Product Width2.1 IN
Shipping Weight6 LBS
ECCN Number3A992
HTS/Schedule B Number9030390100
Country of OriginRomania


Q & A

Q: What ground resistance methods can the Fluke 1621 perform?
A: The Fluke 1621 can be used for 3-pole Fall-of-Potential (IEC/EN 61557-5) and 2-pole ground resistance.

Q: The Fluke 1621 literature states it tests for stray interference. Why is this important?
A: The Fluke 1621 checks for interference voltage (noise) fault voltage above 20 V. Interference above 20 V greatly diminishes the accuracy of measurements


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