DET4 Series
Earth/Ground Resistance & Soil Resistivity Testers
SPECIFICATIONS
Resistance range:
0.01 to 200 k
Ω
autoranging
(0.01 to 20k
Ω
for models DET4TD2 and DET4TR2)
Resistance accuracy:
2P measurements
2% ±3 digits
3P measurements
2% ±3 digits
4P measurements
2% ±3 digits
ART measurements
5% ±3 digits
Stakeless measurements 7% ±3 digits
Maximum probe resistance:
DET4TD2 and DET4TR2
Rp limit: 100k
Ω
(50V output voltage)
Rc limit: 100k
Ω
(50V output voltage)
Limits reduced to 50k
Ω
for 25V output voltage
Limits reduced to 5k
Ω
for 0.01
Ω
resolution
DET4TC2 and DET4TCR2
Rp limit: 200k
Ω
(50V output voltage)
Rc limit: 200k
Ω
(50V output voltage)
Limits reduced to 100k
Ω
for 25V output voltage
Limits reduced to 5k
Ω
for 0.01
Ω
resolution
Earth voltage range:
0 – 100 V
Earth voltage accuracy:
2% ±2 V
2-wire test:
Yes, all models
3-wire test:
Yes, all models
4-wire test:
Yes, all models
ART (Attached Rod Technique):
DET4TC2, DET4TCR2
Stakeless test:
DET4TC2 and DET4TCR2
Ground current range (with current measuring clamp):
0.5 mA to 19.9 A
Ground current accuracy:
5% ±3 digits
Display:
DET4TD2 and DET4TR2: 3-1/2 digit high contrast LCD
DET4TC2 and DET4TCR2: 3-1/2 digit high contrast LCD, backlit
Test frequency:
94, 105, 111 and 128 Hz
(128 Hz for DET4TD2 and DET4TR2)
Test voltage:
25 V or 50 V, user selectable (factory setting 50 V)
Test current:
450 micro-amps at 25 V or 50 V (selectable),
4.5 mA at 25 V
Noise rejection:
40V pk to pk
Noise check:
Automatic
C spike check:
Automatic
P spike check:
Automatic
Battery type:
8 1.5 V AA cells (8 1.5 V AA NiMH rechargeable
cells – DET4TR2 and DET4TCR2)
Battery life:
3 hours, 700 consecutive tests
Safety:
EN61010-1 CAT IV 100 V
Terminals:
4 mm plug type (test leads)
Ingress protection:
IP54
EMC:
Meets the requirements of EN61326-1:1998 for use in heavy
industrial areas, including amendment 1
Dimensions:
8 x 5.7 x 3.2 in. (203 x 148 x 78 mm)
Weight:
2.2 lb (1 kg)
Operating temperature range:
5º to +131º F (-15º to +55º C)
Storage temperature range:
-40º to +158º F (-40º to +70º C)
Humidity:
95% RH non-condensing at 104º F (40º C)
Standards Compliance
Complies with the requirements of KEMA K85B.
Complies with the following parts of EN61557, “Electrical safety
in low voltage distribution systems up to 1000 V a.c. and 1500 V
d.c. - Equipment for testing, measuring or monitoring of protective
measures”.
Part 1 - General requirements
Part 5 - Resistance to earth
STAKELESS (CLAMP-ON) TESTING
The DET4TC2 and DET4TCR2 include stakeless, or
clamp-on testing capability. In effect, these models can
be operated in the same way as a clamp-on ground
tester, eliminating the need to disconnect the ground
under test and drive test probes in certain ground system
testing applications. This method is also useful when
there is insufficient space to perform a classic fall-of-
potential measurement. In addition the units can be used
to measure ground leakage or phase current.
The user simply clamps the optional ICLAMP (current
clamp) and VCLAMP (voltage clamp) around the ground
under test in the manner prescribed in the operator’s
manual and takes the reading. A defined test voltage is
injected into the system using the VCLAMP, inducing a
current, I, to flow and be measured by the ICLAMP. The
instrument then calculates the approximate resistance of
the ground under test.
The stakeless method is subject to the same limitations
faced by the traditional clamp-on ground tester. It is
effective only in situations with multiple grounds in
parallel and cannot be proofed like a fall-of-potential
test. In situations where the stakeless method reading is
questionable, a full fall-of-potential test is recommended.
The advantage of the DET4TC2 and DET4TCR2 is that the
units include both test methods in a single instrument,
making them the most versatile units available.
