Fluke 1623 Data sheet
Fluke 1623 and 1625
GEO Earth Ground Testers
The new Fluke 1623 and 1625
GEO Earth Ground Testers offer
an innovative solution, called
Stakeless testing, to make your
earth ground loop resistance
testing quicker and easier. No
need for a separate earth
ground clamp.
• 3- and 4-pole Fall of Potential,
earth resistance loop testing
• 4-pole Soil Resistivity testing
• Selective earth ground rod
testing using 1 clamp
• Stakeless earth ground rod
testing using 2 clamps
• IP56 rated for outdoor use
• Rugged carrying case
Technical Data
In addition, the Fluke 1625 offers
these advanced features:
• Automatic Frequency Control
(AFC) - identifies existing
interference and chooses a
measurement frequency to
minimize its effect, providing
more accurate earth ground
value
• R* measurement - calculates
earth ground impedance at
55 Hz to more accurately
reflect the earth ground
resistance that a fault-toearth ground would see
• Adjustable limits - for quicker
testing
Stakeless testing
The Fluke 1623 and 1625 earth
ground testers are able to measure
earth ground loop resistances using
only clamps. With this test method,
two clamps are placed around the
earth ground rod and each are connected to the tester. No earth ground
stakes are used at all. A known, fixed
voltage is induced by one clamp and
the current is measured using the
second clamp. Then the tester automatically determines the resistance
of the earth ground rod.
This test method only works if a
bonded earth ground system exists for
the building or structure under test, but
most are. If there is only one path to
ground, like at many residential applications, the Stakeless method will not
provide an acceptable value and the Fall
of Potential test method must be used.
With Stakeless testing, the earth
ground rod does not need to be disconnected—leaving the bonded earth
ground system intact during test. Gone
are the days of spending time placing
and connecting stakes for each earth
ground rod on your system—a major
time saver. You can also perform earth
ground tests in places you’ve not
considered before: inside buildings,
power pylons, or anywhere you don’t
have access to soil.
The most complete testers
The Fluke 1623 and 1625 are distinctive earth
ground testers that can perform all four types of
earth ground measurement:
3- and 4-Pole Fall of Potential (using stakes)
•
4-Pole Soil Resistivity testing (using stakes)
•
Selective testing (using 1 clamp and stakes)
•
Stakeless testing (using 2 clamps only)
•
The testers are also easy to use. For each test,
the testers inform you which stakes or clamps need
to be connected and the large rotary switch can be
used even with a gloved hand.
The complete model kit comes with the 1623
or 1625 tester, test leads, 4 earth ground stakes,
3 cable reels with wire, 2 clamps, batteries, and
manual—all inside a rugged Fluke carrying case.
1623 Specifications
General
Display:1999 digit LCD Display with special symbols, digit height 25 mm, fluorescent backlight
User interface Instant measurement through TURN and START one button concept. The only operating elements are
Robust and waterproof Instrument is designed for tough environmental conditions (rubber protective cover, IP56)
rotary switch and START button
Temperature ranges
Working temperature -10 °C to 50 °C (14 °F to 22 °F)
Operating temperature 0 °C to 35 °C (32 °F to 95 °F)
Storage temperature -20 °C to 60 °C (-4 °F to 140 °F)
Reference temperature 23 °C to ± 2 °C (73 °F to ± 4 °F)
The chart of four temperature ranges for the instrument exist 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.
Temperature coefficient ± 0.1 % of reading/K
Intrinsic error Refers to the reference temperature range and is guaranteed for 1 year
Operating error Refers to the operating temperature range and is guaranteed for 1 year
Climatic class C1 (IEC 654-1), -5 °C to +45 °C (23° to +115° F), 5 % to 95 % RH
Protective type IP56 for case, IP40 for battery door according to EN60529
Safety Protection by double and/or reinforced insulation. max. 50 V to earth
EMC (Emission Immunity) IEC 61326-1:1997 Class A
Quality system Developed, designed and manufactured according to DIN ISO 9001
External voltage V ext, max = 24 V (dc, ac < 400 Hz), measurement inhibited for higher values
V ext rejection > 120 dB (162⁄3, 50, 60, 400 Hz)
Measuring time Typical 6 sec.
Max. overload 250 V rms (pertains to misuse)
Auxiliary power 6 x 1.5 V mignon cells alkali-manganese (type AA LR6)
Battery life span Typical > 3,000 measurements
Dimensions (WxHxD) 250 mm x 133 mm x 187 mm (9.75 in x 5.25 in x 7.35 in)
Weight 1.1 kg (2.43 lb) including batteries
2 Fluke Corporation 1623 and 1625 GEO Earth Ground Testers
RA 3-pole ground resistance measurement (IEC 1557-5)
Switch position Resolution Measuring range Intrinsic error Operating error
RA 3-pole 0.001 Ω to 10 Ω 0.001 Ω to 19.99 kΩ ± (2 % rdg + 3 d) ± (5 % rdg + 3 d)
For 2-pole measurements connect terminals H and S with the supplied connector cable.
Measuring principle: Current and voltage measurement
Measuring voltage Vm = 48 V ac
Short-circuit current > 50 mA
Measure frequency 128 Hz (125 Hz on request)
Probe resistance (RS) Max 100 k Ω
Auxiliary earth electrode resistance (RH) Max. 100 kΩ
Additional error from RH and R
S
Monitoring of RS and RH with error indicator
Automatic range selection
Measurement is not performed if the current through the current clamp is too low
RH[kΩ]
• ••
RS[kΩ]/RA[Ω]
• ••
0.2 %
RA 4-pole ground resistance measurement (IEC 1557-5)
Switch position Resolution Measuring range Intrinsic error Operating error
R
4-pole 0.001 Ω to 10 Ω 0.001 Ω to 19.99 kΩ ± (2 % rdg + 3 d) ± (5 % rdg + 3 d)
A
Measuring principle: Current/voltage measurement
Measuring voltage Vm = 48 V ac
Short-circuit current > 50 mA
Measuring frequency 128 Hz (125 Hz on request)
Probe resistance (RS+ RES) Max. 100 kΩ
Auxiliary earth electrode resistance (RH) Max. 100 kΩ
Additional error from RH and R
S
Monitoring of RS, and RH with error indicator
Automatic range selection
RH[kΩ]
• ••
RS[kΩ/RA[Ω]
• ••
0.2 %
RA 3-pole selective ground resistance measurement with current clamp (R
)
A
Switch position Resolution Measuring range Intrinsic error Operating error
RA 3-pole
0.001 Ω to 10 Ω 0.001 Ω to 19.99 kΩ ± (7 % rdg + 3 d) ± (10 % rdg + 5 d)
Measuring principle: Current/voltage measurement (with external current clamp)
Measuring voltage Vm = 48 V ac
Short-circuit current > 50 mA
Measuring frequency 128 Hz (125 Hz on request)
Probe resistance (RS) Max. 100 kΩ
Auxiliary earth electrode resistance (RH) Max. 100 kΩ
Monitoring of RS, and RH with error indicator
Automatic range selection
Measurement is not performed if the current through the current clamp is too low
3 Fluke Corporation 1623 and 1625 GEO Earth Ground Testers
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