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 |

U_{rms} = 0 V |

Sockets E, ES, S or H to each other in any combination, max. U_{rms} = 250 V (pertains to misuse) |

Safety |
Protection by double and/or reinforced insulation. Max. 50 V to earth per IEC61010-1. 300V CAT II, 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 (R_{E}+R_{H} ≤ 1 kΩ) |

With IEC LR6/type AA: typ. 6,000 measurements (R_{E} + R_{H} > 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 (U_{ST}) |

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 |
U_{rms} = 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 R^{1} |

Noise rejection |
120 dB (16 2/3 , 50 , 60, 400 Hz) |

Max. overload |
U_{rms} = 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 R_{A} 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 √E^{2}_{1} E^{2}_{2} E^{2}_{3} E^{2}_{4} E^{2}_{5} E^{2}_{6 }) |
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 |
R_{H}(R_{S} + 2000 Ω)/R_{E} x 1.25 x 10^{-6}% + 5 digits |

Measuring error of R_{H} and R_{S} |
Typ. 10% of R_{E} + R_{S} + R_{H} |

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 R_{H} |

RH with U_{meas} = 48 V |
< 300 Ω |

< 6 Ω |

< 60 Ω |

< 600 Ω |

RH with U_{meas} = 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 (R_{E} 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 (R^{1}) |

Noise rejection |
120 dB (162/3, 50, 60, 400 Hz) |

Max. overload |
Max. U_{rms} = 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 |
R_{H}(R_{S} + 2000 Ω)/R_{ETOTAL} x 1.25 x 10^{-6}% + 5 digits |

Measuring error of R_{H} and R_{S} |
Typ. of 10% of R_{ETOTAL} + R_{S} + R_{H} |

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 |
U_{rms} 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 |
U_{rms} = 250 V |

Compensation of Lead Resistance (R_{K}) |

Compensation of lead resistance (R_{K}) can be switched on in functions R_{E} 3-pole, R_{E} 4-pole (clamp), R AC, and R DC 2-pole |

Formation of measured value |
R_{display} = R_{measured} – R_{compensated}^{2} |

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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