Fluke 1621 Earth Ground Tester

Last Updated
16 Mar 2023
Country Origin
United States
Minimum Order

Specification of Fluke 1621 Earth Ground Tester

Fluke 1621 Earth Ground Tester

Earth ground Tester for the measurement of the resistance of the

Fluke 1621 is earth ground tester is easy to use. For testing the resilience of the soil, which is the first line of Defense is 1621 in detecting reliable ground connection. This unit has the basic soil testing methods including 3-pole Fall-of-Potential and soil resistance test 2-pole. Comfortable, rugged Holster size, and large, clear LCD display makes it ideal field bumI ground tester, for most working environment electrical grounding. With a simple user interface and intuitive functions, Fluke 1621 is a tool useful for grounding electrical contractors, engineers, utility and specialist test ground of the Earth.



  • 3-pole Fall-of-potential of the Earth for measurement testing basics

  • measurement of the resistance of the 2-pole for added flexibility

  • Easily capture the value with the single -  button operation

  • Ensure accurate measurements with voltage detection ' sounds ' automatic

  • Warning hazardous voltage protection users increased

  • Definitely read and record data with large screen, backlit

  • rugged Holster and design to a difficult working environment

  • portable size allows for easy transport

  • Instantly reminded to measurement outside Your limits are set, to

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]

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


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  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 kΩ

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 Hz

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 kΩ

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)


[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.


Model And Accesories

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


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