General Specifications 
Memory 
Internal memory storage up to 1500 records accessible via USB port 
Measuring function 
Interference voltage and frequency, earthing resistance 3 and 4pole with/without clipon current transformer, resistance 2pole with AC, 2 and 4pole 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 IEC610101. 300 V 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 IEC615575 
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 E_{n} = 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 probeand 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 IEC615575. 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 EN615575 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 IEC615574 possible 
Measuring voltage 
20 V DC 
Short circuit current 
250 mA DC 
Formation of measured value 
With 4pole 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 (2pole or 4pole) 
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} 3pole, R_{E} 4pole (clamp), R AC, and R DC 2pole 
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 4pole (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) 
Measuring principle: Stakeless measurement of resistance in closed loops using two current transformers. 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. 