Fluke 1623 User manual

2 Fluke Corporation 1623 and 1625 GEO Earth Ground Testers
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
rotary switch and START button
Robust and waterproof Instrument is designed for tough environmental conditions (rubber protective cover, IP56)
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
1623 Specifications
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.

3 Fluke Corporation 1623 and 1625 GEO Earth Ground Testers
RA3-pole ground resistance measurement (IEC 1557-5)
Switch position Resolution Measuring range Intrinsic error Operating error
RA3-pole 0.001 7to 10 70.001 7to 19.99 k7± (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 k7
Auxiliary earth electrode resistance (RH)Max. 100 k7
Additional error from RHand RSRH[k7]•••RS[k7]/RA[7]•••0.2 %
Monitoring of RSand RHwith error indicator
Automatic range selection
Measurement is not performed if the current through the current clamp is too low
RA4-pole ground resistance measurement (IEC 1557-5)
Switch position Resolution Measuring range Intrinsic error Operating error
RA4-pole 0.001 7to 10 70.001 7to 19.99 k7± (2 % rdg + 3 d) ± (5 % rdg + 3 d)
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 k7
Auxiliary earth electrode resistance (RH)Max. 100 k7
Additional error from RHand RSRH[k7]•••RS[k7/RA[7]•••0.2 %
Monitoring of RS, and RHwith error indicator
Automatic range selection
RA3-pole selective ground resistance measurement with current clamp (RA )
Switch position Resolution Measuring range Intrinsic error Operating error
RA3-pole 0.001 7to 10 70.001 7to 19.99 k7± (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 k7
Auxiliary earth electrode resistance (RH)Max. 100 k7
Monitoring of RS, and RHwith error indicator
Automatic range selection
Measurement is not performed if the current through the current clamp is too low

4 Fluke Corporation 1623 and 1625 GEO Earth Ground Testers
RA4-pole selective ground resistance measurement with current clamp (RA )
Switch position Resolution Measuring range Intrinsic error Operating error
RA4-pole 0.001 7to 10 70.001 7to 19.99 k7± (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 k7
Auxiliary earth electrode resistance (RH)Max. 100 k7
Monitoring of RS, and RHwith error indicator
Automatic range selection
Measurement is not performed if the current through the current clamp is too low
Stakeless ground loop measurement ( )
Switch position Resolution Measuring range Intrinsic error Operating error
RA4-pole 0.001 7to 0.1 70.001 7to 199.9 7± (7 % rdg + 3 d) ± (10 % rdg + 5 d)
Measuring principle: Stakeless measurement of resistance in closed loops using two current transformers
Measuring voltage Vm = 48 V ac (primary)
Measuring frequency 128 Hz (125 Hz on request)
Noise current (IEXT)Max. IEXT = 10 A (ac) (RA< 20 7)
Max. IEXT = 2 A (ac) (RA> 20 7)
Automatic range selection
The information regarding stakeless ground loop measurements is only valid when used in conjunction with the recommended current clamps at the minimum
distance specified.

5 Fluke Corporation 1623 and 1625 GEO Earth Ground Testers
General
Description Microprocessor controlled, fully automated earth measuring instrument with additional functions
Measuring function Interference voltage and frequency, earthing resistance 3- and 4-pole with/without clip-on current transformer,
resistance 2-pole with ac, 2- and 4-pole with dc
Display 4 digit (2999 Digit) - 7 segment liquid crystal display, digit size 18 mm (0.71 in) with supplementary signs and
active illumination
Operation Central rotary switch and function keys
1625 Specifications
Temperature ranges
Working temperature range -10 °C to 50 °C (14° F to 122° F)
Operating temperature range 0 °C to 35 °C (32° F to 95° F)
Nominal temperature range 18 °C to 28 °C (64° F to 82° F)
Storage temperature range -30 °C to 60 °C (-22° F to 140° F)
Note: 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 range/Kelvin
Operating errors Refer to operating temperature range and RH< 20 RE, RS< 100 RE
The maximum percentage operating error within the measurement range does not exceed ± 30 % with the measured value as fiducial value, as determined in
accordance with Table 1 in the 1625 Users Manual.
The operating error applies under the rated operating conditions given in IEC1557-1 and the following:
• injection of series interference voltages with system frequencies of 400 Hz, 60 Hz, 50 Hz, 162/3Hz or with dc voltage respectively across the terminals E (ES)
and S. The rms value of the series interference voltage shall be 3 V;
• resistance of the auxiliary earth electrode and of the probes: 0 to 100 x RAbut b50 k7;
• system voltages between 85 % and 110 % of the nominal voltage and between 99 % and 101 % of the nominal system frequency for measuring equipment
with a mains supply and/or measuring equipment deriving its output voltage directly from the distribution system.

6 Fluke Corporation 1623 and 1625 GEO Earth Ground Testers
Limits of error Refer to nominal temperature range
Climate class C1 (IEC 654-1), -5 °C to 45 °C, 5 % to 95 % RH
Type of protection IP56 for case, IP40 for battery door according to EN60529
Max voltage !socket to socket
Urms = 0 V
Sockets ” “ to each other in any combination, max. Urms = 250 V (pertains to misuse)
EMC (Emission Immunity) IEC 61326-1:1997 Class A
Quality standard Developed, designed and manufactured to comply with DIN ISO 9001
External field influence Complies with DIN 43780 (8/76)
Auxiliary power 6 x 1.5 V alkali-manganese-batteries (IEC LR6 or type AA )
Battery life span With IEC LR6/type AA: typ. 3,000 measurements (RE+RHb1k7)
With IEC LR6/type AA : typ. 6,000 measurements (RE+ RH> 10 k7)
Dimensions (WxHxD) 250 mm x 133 mm x 187 mm (9.75 in x 5.25 in x 7.35 in)
Weight b1.1 kg (2.43 lb) without accessories
b5.5 kg (12.13 lb) incl. accessories and batteries in carrying case
Case material NORYL, shock -and scratch proof thermoplast
Measurement of interference voltage dc + ac (UST)
Measuring Limits of error: method Fullwave rectification
Measuring Range Display Range Resolution Frequency Range Limits of Error
1 V to 50 V 0.0 V to 50 V 0.1 V dc/ac 45 Hz to 400 Hz sine ± (5 % of rdg + 5 digit)
Measuring sequence approx. 4 measurements/s
Internal resistance approx. 1.5 M7
Max. overload Urms = 250 V
Measurement of interference frequency (F )
Measuring method Measurement of oscillation period of the interference voltage
Measuring Range Display Range Resolution Range Limits of Error
6.0 Hz to 400 Hz 16.0 Hz to 299.9 Hz to 999 Hz 0.1 Hz to 1 Hz 1 V to 50 V ± (1 % of rdg + 2 digit)
Earthing resistance (RE)
Measuring method Current and voltage measurement with probe as IEC61557-5
Open circuit voltage 20/48 V, ac
Short circuit current 250 mA ac
Measuring frequency 94, 105, 111, 128 Hz selected manually or automatic. (AFC) 55 Hz in function R*
Noise rejection 120 dB (162/3, 50 , 60, 400 Hz)
Max. overload Urms = 250 V

7 Fluke Corporation 1623 and 1625 GEO Earth Ground Testers
Electrical measurement specifications
Intrinsic error or influence
quantity
Reference conditions or specified
operating range
Designation
code
Requirements or test in
accordance with the relevant
parts of IEC 1557
Type
of test
Intrinsic error Reference conditions A Part 5, 6.1 R
Position Reference position ± 90° E1 Part 1, 4.2 R
Supply voltage At the limits stated by the
manufacturer
E2 Part 1, 4.2, 4.3 R
Temperature 0 °C and 35 °C E3 Part 1, 4.2 T
Series interference voltage See 4.2 and 4.3 E4 Part 5, 4.2, 4.3 T
Resistance of the probes and
auxiliary earth electrodes
0 to 100 x RAbut b50 k7E5 Part 5, 4.3 T
System frequency 99 % to 101 % of the
nominal frequency
E7 Part 5, 4.3 T
System voltage 85 % to 110 % of the nominal voltage E8 Part 5, 4.3 T
Operating error Part 5, 4.3 R
A = intrinsic error
En = variations
R = routine test
T = type test
Measuring
Range Display Range Resolution Instrinsic Error Max. Operating Error
0.020 7to 0.001 7to 2.999 70.001 7± ( 2 % of rdg + 2 digit ) ± ( 5 % of rdg + 5 digit )
300 k73.00 7to 29.99 70.01 7
30.0 7to 299.9 70.1 7
0.300 k7to 2.999 k717
3.00 k7to 29.99 k710 7
30.0 k7to 299.9 k7100 7
Measuring time typ. 8 sec. with a fixed frequency
30 sec. max. with AFC and complete cycle of all measuring frequencies
Additional error because of probe-and auxiliary earth
electrode resistance
Measuring error of RH and RS typ. 10 % of RE+ RS+ RH
Max. probe resistance b1 M7
Max. auxiliary earth electrode resistance b1 M7
Automatic check if error is kept within the limits required by IEC61557-5.
If after a measurement of probe-, auxiliary earth electrode- and earthing resistance, a measurement error of higher than 30 % is assumed because of the influencing
conditions (see diagram), the display shows a warning symbol !and a notice that RSor RHare too high.

8 Fluke Corporation 1623 and 1625 GEO Earth Ground Testers
Automatic switchover of measuring resolution in
dependence to auxiliary earth electrode resistance RH
RH with Umeas = 48 V RH with Umeas = 20 V Resolution
< 300 7< 250 71m7
< 6 k7< 2.5 k710 m7
< 60 k7< 25 k7100 m7
< 600 k7< 250 k717
Selective measurement of the earthing
resistance (RE )
Measuring method Current and voltage measurement with
probe as per EN61557-5 and current
measurement in the individual branch
with additional current transformer
(patent applied for).
Open circuit voltage 20/48 V ac
Short circuit current 250 mA ac
Measuring frequency 94, 105, 111, 128 Hz selected manually
or automatically (AFC), 55 Hz (R*)
Noise rejection 120 dB (162/3, 50, 60, 400 Hz)
Max. overload Max. Urms = 250 V (measurement will
not be started)
Measuring Range Display range Resolution Intrinsic error* Operating error*
0.020 7to 30 k70.001 to 2.999 70.001 7± (7 % of rdg + 2 digit) ± (10 % of rdg + 5 digit)
3.00 to 29.99 70.01 7
30.0 to 299.9 70.1 7
0.300 to 2.999 k717
3.00 to 29.99 k710 7
* With recommended current clamps/transformers.
Additonal error because of probe- and auxiliary earth
typ. electrode resistance
Measuring error of RHand RSTyp. of 10 % of RETOTAL + RS+ RH
Measuring time Typ. 8 sec. with a fixed frequency 30 sec. max. with AFC and complete cycle of
all measuring frequencies
Minimal current in single branch to be measured 0.5 mA With transformer (1000:1)
0.1 mA With transformer (200:1)
Max. interference current through transformer 3 A With a transformer (1000:1)

9 Fluke Corporation 1623 and 1625 GEO Earth Ground Testers
Resistance measurement (R~)
Measuring method Current and voltage measurement
Measuring voltage 20 V ac, square pulse
Short circuit current > 250 mA ac
Measuring frequency 94, 105, 111, 128 Hz selected manually or automatically (AFC)
Measuring range Display range Resolution Intrinsic error Operating errors
0.020 7to 300 k70.001 7to 2.999 70.001 7± (2 % of rdg + 2 digit) ± (5 % of rdg + 5 digit)
3.0 7to 29.99 70.01 7
30 7to 299.9 70.1 7
300 7to 2999 717
3.0 k7to 29.99 k710 7
30.0 k7to 299.9 k7100 7
Measuring time typ. 6 sec.
Max. interference voltage 24 V, with higher voltages measurement will not be started
Max overload Urms max. = 250 V
Resistance measurement (R )
Measuring method current- voltage measurement as per IEC61557-4 possible
Open circuit voltage 20 V dc
Short circuit current 200 mA dc
Formation of measured value with 4-pole measurement wires on H, S, ES can be extended without additional error.
Resistances > 1 7in wire E can cause additional error of 5m 7/7.
Measuring range Display range Resolution Intrinsic error Operating error
0.020 7to 3 k70.001 7to 2.999 70.001 7± (2 % of rdg + 2 digit) ± (5 % of rdg + 5 digit)
3.0 7to 29.99 70.01 7
30.0 7to 299.9 70.1 7
300 7to 2999 717
Measuring sequence Approx. 2 measurements/s
Measuring time Typ. 4 sec. incl. reversal of polarity (2-pole or 4-pole)
Max. interference voltage b3 V ac or dc, with higher voltages measurement will not be started
Max inductivity 2 Henry
Max. overload Urms = 250 V
Compensation of lead resistance (RK)
Compensation of lead resistance (RK) can be switched on in functions RE3-pole, RE4-pole , R~ , and R 2-pole
Formation of measured value Rdisplay = Rmeasured - Rcompensated*
* Value of setpoint entry RK= 0.000 7, variable from 0.000 to 29.99 7by means of measuring adjustment.