1621 Earth Ground Tester

Earth Ground Tester for resistance measurement
The Fluke 1621 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.

Product Description


Fluke 1621
  • 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


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
 One 9 volt alkaline (LR61)
Battery condition
 LO-BAT is displayed if voltage drops below 6.5 V
Between jacks H/C2 and E/C1:
 250 Veff maximum (effective voltage)
Between jacks S/P2 and E/C1:
 250 Veff maximum
Climatic class
 VDE/VDI 3540 RZ (conforming to KWG as per DIN 40040, 4/87)
Temperature performance[2]
 -10 °C to +50 °C (+14 °F to +122 °F)
 0 °C to +35 °C (+32 °F to +95 °F)
 -20 °C to +60 °C (+68 °F to +140 °F)
 +23 °C ± 2 °C (+73 °F ± 4 °F)
Temperature coefficient
 ± 0.1 % of range per degree Kelvin
 IEC/EN 61010-1, 600 V CAT II, pollution degree 2
 113 mm x 54 mm x 216 mm (4.5 in x 2.1 in x 8.5 in), including holster
 850 g (1.9 lb), including standard accessories, volume approximately 600 cm3
 [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
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
 < 7 kΩ
 0.01 Ω
 < 50 kΩ
 0.1 Ω
 > 50 kΩ
 1 Ω
Interference voltage display dc + ac
 30 Veff
Common mode rejection
 > 80 dB at 50 Hz and 60 Hz
 680 kΩ
Measuring uncertainty
 < 10 % for pure ac and dc signals
Measuring range
0.15 Ω to 20 Ω
 0.01 Ω
Display range
 0 to 19.99 Ω
200 Ω
 0.1 Ω
Display range
 20 to 199.9 Ω
2 kΩ
 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)
 [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.

Models and Accessories

Model Name
Fluke 1621
Earth Ground Tester
1621 includes:
  • 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
Accessory Kits
Stake Set for 3-Pole Measurement
Cables and Hardware
Cable Reel 25M BL
Ground/Earth Cable Reel 25 m (81.25 ft)
Cable Reel 25M GR
Ground/Earth Cable Reel 25 m (81.25 ft)
Cable Reel 50M RD
Ground/Earth Cable Reel 50 m (162.5 ft)
Ground/Earth Cable Reel 25 M Wire
Ground/Earth Cable Reel 50 M Wire
Cases and Holsters
CXT280 Extreme Case
Other Accessories
GEO Earth Stake 2
Ground/Earth Stake 2

Checking ground electrode impedance
for commercial, industrial and residential buildings

[pdfviewer width=”1182px” height=”1673px” beta=”true/false”]https://www.mrmmetrology.com/wp-content/uploads/2018/02/2550440_6115_ENG_C_W.pdf[/pdfviewer]

Earth Ground Education

[pdfviewer width=”1182px” height=”1673px” beta=”true/false”]https://www.mrmmetrology.com/wp-content/uploads/2018/02/2633834_6115_ENG_A_W.pdf[/pdfviewer]


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