Fluke 1621 Earth Ground Tester


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.


• 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

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Product Description

Fluke 1621 Earth Ground Tester’s 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.

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.

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

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.

Additional Information

Weight0.56 kg


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