| General Specifications |
| Memory |
Internal memory storage up to 1500 records accessible via USB port |
| 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, with improved visibility |
| Operation |
Central rotary switch and function keys |
| Temperature Range |
| Operating temperature |
-10°C to 50°C (14°F to 122°F) |
| Storage temperature |
-30°C to 60°C (-22°F to 140°F) |
| Temperature coefficient |
±0.1% of reading/°C < 18°C > 28°C |
| Type of protection |
IP56 for case, IP40 for battery door according to EN60529 |
| Max voltage |
Warning – socket “clamp” to socket E, ES, S or H |
| Urms = 0 V |
| Sockets E, ES, S or H to each other in any combination, max. Urms = 250 V (pertains to misuse) |
| Safety |
Protection by double and/or reinforced insulation. Max. 50 V to earth per IEC61010-1. Pollution degree 2 |
| 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 alkaline (IEC LR6 or type AA) |
| Battery life span |
With IEC LR6/type AA: typ. 3,000 measurements (RE+RH ≤ 1 kΩ) |
| With IEC LR6/type AA: typ. 6,000 measurements (RE + RH > 10 kΩ) |
| Dimensions (W x H x D) |
250 x 133 x 187 mm (9.75 x 5.25 x 7.35 in) |
| Weight |
≤ 1.1 kg (2.43 lb) without accessories 7.6 kg (16.8 lb) incl. accessories and batteries in carrying case |
| Case material |
Polyester |
| Measurement of Interference Voltage DC + AC (UST) |
| Measuring limits of error: method |
Full wave rectification |
| Measuring range |
1 V to 50 V |
| Display range |
0.0 V to 50 V |
| Resolution |
0.1 V |
| Frequency range |
DC/AC 45 Hz to 400 Hz sine |
| Accuracy |
±(5% of rdg + 5 digit) |
| Measuring sequence |
Approx. 4 measurements/s |
| Internal resistance |
Approx. 1.5 MΩ |
| Max. overload |
Urms = 250 V |
| Measurement of Interference Frequency (F) |
| Measuring limits of error: method |
Measurement of oscillation period of the interference voltage |
| Measuring range |
6.0 Hz to 400 Hz |
| Display range |
16.0 Hz to 299.9 Hz to 999 Hz |
| Resolution |
0.1 Hz to 1 Hz |
| Range |
1 V to 50 V |
| Accuracy |
±(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 R1 |
| Noise rejection |
120 dB (16 2/3 , 50 , 60, 400 Hz) |
| Max. overload |
Urms = 250 V |
| 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 RA but ≤ 50 kΩ |
E5 |
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 |
B = ±(|A| + 1,15 √E21 E22 E23 E24 E25 E26 ) |
Part 5, 4.3 |
R |
| B[%] = ± B/fiducial value x 100%
A = intrinsic error
En = variations
R = routine test
T = type test |
| Measuring range |
0.020 Ω to 300 kΩ |
| Display range |
0.001 Ω to 2.999 Ω |
| 3.00 Ω to 29.99 Ω |
| 30.0 Ω to 299.9 Ω |
| 0.300 kΩ to 2.999 kΩ |
| 3.00 kΩ to 29.99 kΩ |
| 30.0 kΩ to 299.9 kΩ |
| Resolution |
0.001 Ω |
| 0.01 Ω |
| 0.1 Ω |
| 1 Ω |
| 10 Ω |
| 100 Ω |
| Accuracy |
±(2% of rdg + 2 digit) |
| Operating error |
±(5% of rdg + 5 digit) |
| Measuring time |
Typical 8 seconds 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 |
RH(RS + 2000 Ω)/RE x 1.25 x 10-6% + 5 digits |
| Measuring error of RH and RS |
Typ. 10% of RE + RS + RH |
| Max. probe resistance |
≤ 1 MΩ |
| Max. auxiliary earth electrode resistance |
≤ 1 MΩ |
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, the display shows a warning symbol and a notice that RS or RH are too high. |
| Automatic Switchover of Measuring Resolution in Dependence to Auxiliary Earth Electrode Resistance RH |
| RH with Umeas = 48 V |
< 300 Ω |
| < 6 Ω |
| < 60 Ω |
| < 600 Ω |
| RH with Umeas = 20 V |
< 250 Ω |
| < 2.5 kΩ |
| < 25 kΩ |
| < 250 kΩ |
| Resolution |
1 mΩ |
| 10 mΩ |
| 100 mΩ |
| 1 Ω |
| Selective Measurement of the Earthing Resistance (RE Clamp) |
| 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 (R1) |
| Noise rejection |
120 dB (162/3, 50, 60, 400 Hz) |
| Max. overload |
Max. Urms = 250 V (measurement will not be started) |
| Measuring range |
0.020 Ω to 300 kΩ |
| Display range |
0.001 Ω to 2.999 Ω |
| 3.00 Ω to 29.99 Ω |
| 30.0 Ω to 299.9 Ω |
| 0.300 kΩ to 2.999 kΩ |
| 3.00 kΩ to 29.99 kΩ |
| Resolution |
0.001 Ω |
| 0.01 Ω |
| 0.1 Ω |
| 1 Ω |
| 10 Ω |
| Accuracy |
±(7% of rdg + 2 digit) |
| Operating error |
±(10% of rdg + 5 digit) |
| Additional error because of probe- and auxiliary earth typ. electrode resistance |
RH(RS + 2000 Ω)/RETOTAL x 1.25 x 10-6% + 5 digits |
| Measuring error of RH and RS |
Typ. 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 transformer (1000:1) |
| 1. With recommended current clamps/transformers. |
| 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 |
0.020 Ω to 300 kΩ |
| Display range |
0.001 Ω to 2.999 Ω |
| 3.00 Ω to 29.99 Ω |
| 30.0 Ω to 299.9 Ω |
| 300 Ω to 2999 Ω |
| 3.00 kΩ to 29.99 kΩ |
| 30.0 kΩ to 299.9 kΩ |
| Resolution |
0.001 Ω |
| 0.01 Ω |
| 0.1 Ω |
| 1 Ω |
| 10 Ω |
| 100 Ω |
| Accuracy |
±(2% of rdg + 2 digit) |
| Operating error |
±(5% of rdg + 5 digit) |
| Measuring time |
Typical 6 seconds |
| Max. interference voltage |
24 V, with higher voltages measurement will not be started |
| Max overload |
Urms max. = 250 V |
| Resistance Measurement (R DC) |
| Measuring method |
Current- voltage measurement as per IEC61557-4 possible |
| Measuring voltage |
20 V DC |
| Short circuit current |
250 mA DC |
| Formation of measured value |
With 4-pole measurement wires on H, S, ES can be extended without additional error.
Resistances > 1 Ω in wire E can cause additional error of 5m Ω/Ω. |
| Measuring range |
0.020 Ω to 300 kΩ |
| Display range |
0.001 Ω to 2.999 Ω |
| 3.00 Ω to 29.99 Ω |
| 30.0 Ω to 299.9 Ω |
| 300 Ω to 2999 Ω |
| 3.0 kΩ to 29.99 kΩ |
| 30.0 kΩ to 299.9 kΩ |
| Resolution |
0.001 Ω |
| 0.01 Ω |
| 0.1 Ω |
| 1 Ω |
| 10 Ω |
| 100 Ω |
| Accuracy |
±(2% of rdg + 2 digit) |
| Operating error |
±(5% of rdg + 5 digit) |
| Measuring sequence |
Approx. 2 measurements/s |
| Measuring time |
Typical 4 second including reversal of polarity (2-pole or 4-pole) |
| Maximum interference voltage |
≤ 3 V AC or DC, with higher voltages measurement will not be started |
| Maximum inductivity |
2 Henry |
| Maximum overload |
Urms = 250 V |
| Compensation of Lead Resistance (RK) |
| Compensation of lead resistance (RK) can be switched on in functions RE 3-pole, RE 4-pole (clamp), R AC, and R DC 2-pole |
| Formation of measured value |
Rdisplay = Rmeasured – Rcompensated2 |
| 2. Value of setpoint entry RK = 0.000 Ω, variable from 0.000 to 29.99 Ω by means of measuring adjustment. |
| Stakeless Ground Loop Measurement (Two Clamp Stakeless) |
| Switch position |
RA 4-pole (two clamp Stakeless) |
| Resolution |
0.001 Ω to 0.1 Ω |
| Measuring range |
0.02 Ω to 199.9 Ω |
| Accuracy |
±(7% rdg + 3 digit) |
| Operating error |
±(10% rdg + 5 digit) |
| Measuring voltage |
Vm = 48 V AC (primary) |
| Measuring frequency |
128 Hz |
| Noise current (IEXT) |
Max. IEXT = 10 A (AC) (RA < 20 Ω) |
| Max. IEXT = 2 A (AC) (RA > 20 Ω) |
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