| Technical Specification | <table>
<tbody>
<tr>
<td colspan="5">General Specifications</td>
</tr>
<tr>
<td>Memory</td>
<td colspan="4">Internal memory storage up to 1500 records accessible via USB port</td>
</tr>
<tr>
<td>Measuring function</td>
<td colspan="4">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</td>
</tr>
<tr>
<td>Display</td>
<td colspan="4">4 digit (2999 Digit) - 7 segment liquid crystal display, with improved visibility</td>
</tr>
<tr>
<td>Operation</td>
<td colspan="4">Central rotary switch and function keys</td>
</tr>
<tr>
<td colspan="5">Temperature Range</td>
</tr>
<tr>
<td>Operating temperature</td>
<td colspan="4">-10°C to 50°C (14°F to 122°F)</td>
</tr>
<tr>
<td>Storage temperature</td>
<td colspan="4">-30°C to 60°C (-22°F to 140°F)</td>
</tr>
<tr>
<td>Temperature coefficient</td>
<td colspan="4">±0.1% of reading/°C < 18°C > 28°C</td>
</tr>
<tr>
<td>Type of protection</td>
<td colspan="4">IP56 for case, IP40 for battery door according to EN60529</td>
</tr>
<tr>
<td rowspan="3">Max voltage</td>
<td colspan="4">Warning – socket "clamp" to socket E, ES, S or H</td>
</tr>
<tr>
<td colspan="4">Urms = 0 V</td>
</tr>
<tr>
<td colspan="4">Sockets E, ES, S or H to each other in any combination, max. Urms = 250 V (pertains to misuse)</td>
</tr>
<tr>
<td>Safety</td>
<td colspan="4">Protection by double and/or reinforced insulation. Max. 50 V to earth per IEC61010-1. Pollution degree 2</td>
</tr>
<tr>
<td>Quality standard</td>
<td colspan="4">Developed, designed and manufactured to comply with DIN ISO 9001</td>
</tr>
<tr>
<td>External field influence</td>
<td colspan="4">Complies with DIN 43780 (8/76)</td>
</tr>
<tr>
<td>Auxiliary power</td>
<td colspan="4">6 x 1.5 V alkaline (IEC LR6 or type AA)</td>
</tr>
<tr>
<td rowspan="2">Battery life span</td>
<td colspan="4">With IEC LR6/type AA: typ. 3,000 measurements (RE+RH ≤ 1 kΩ)</td>
</tr>
<tr>
<td colspan="4">With IEC LR6/type AA: typ. 6,000 measurements (RE + RH > 10 kΩ)</td>
</tr>
<tr>
<td>Dimensions (W x H x D)</td>
<td colspan="4">250 x 133 x 187 mm (9.75 x 5.25 x 7.35 in)</td>
</tr>
<tr>
<td>Weight</td>
<td colspan="4">≤ 1.1 kg (2.43 lb) without accessories 7.6 kg (16.8 lb) incl. accessories and batteries in carrying case</td>
</tr>
<tr>
<td>Case material</td>
<td colspan="4">Polyester</td>
</tr>
<tr>
<td colspan="5">Measurement of Interference Voltage DC + AC (UST)</td>
</tr>
<tr>
<td>Measuring limits of error: method</td>
<td colspan="4">Full wave rectification</td>
</tr>
<tr>
<td>Measuring range</td>
<td colspan="4">1 V to 50 V</td>
</tr>
<tr>
<td>Display range</td>
<td colspan="4">0.0 V to 50 V</td>
</tr>
<tr>
<td>Resolution</td>
<td colspan="4">0.1 V</td>
</tr>
<tr>
<td>Frequency range</td>
<td colspan="4">DC/AC 45 Hz to 400 Hz sine</td>
</tr>
<tr>
<td>Accuracy</td>
<td colspan="4">±(5% of rdg + 5 digit)</td>
</tr>
<tr>
<td>Measuring sequence</td>
<td colspan="4">Approx. 4 measurements/s</td>
</tr>
<tr>
<td>Internal resistance</td>
<td colspan="4">Approx. 1.5 MΩ</td>
</tr>
<tr>
<td>Max. overload</td>
<td colspan="4">Urms = 250 V</td>
</tr>
<tr>
<td colspan="5">Measurement of Interference Frequency (F)</td>
</tr>
<tr>
<td>Measuring limits of error: method</td>
<td colspan="4">Measurement of oscillation period of the interference voltage</td>
</tr>
<tr>
<td>Measuring range</td>
<td colspan="4">6.0 Hz to 400 Hz</td>
</tr>
<tr>
<td>Display range</td>
<td colspan="4">16.0 Hz to 299.9 Hz to 999 Hz</td>
</tr>
<tr>
<td>Resolution</td>
<td colspan="4">0.1 Hz to 1 Hz</td>
</tr>
<tr>
<td>Range</td>
<td colspan="4">1 V to 50 V</td>
</tr>
<tr>
<td>Accuracy</td>
<td colspan="4">±(1% of rdg + 2 digit)</td>
</tr>
<tr>
<td colspan="5">Earthing Resistance (RE)</td>
</tr>
<tr>
<td>Measuring method</td>
<td colspan="4">Current and voltage measurement with probe as IEC61557-5</td>
</tr>
<tr>
<td>Open circuit voltage</td>
<td colspan="4">20/48 V, AC</td>
</tr>
<tr>
<td>Short circuit current</td>
<td colspan="4">250 mA AC</td>
</tr>
<tr>
<td>Measuring frequency</td>
<td colspan="4">94, 105, 111, 128 Hz selected manually or automatic. (AFC) 55 Hz in function R1</td>
</tr>
<tr>
<td>Noise rejection</td>
<td colspan="4">120 dB (16 2/3 , 50 , 60, 400 Hz)</td>
</tr>
<tr>
<td>Max. overload</td>
<td colspan="4">Urms = 250 V</td>
</tr>
<tr>
<td colspan="5">Electrical Measurement Specifications</td>
</tr>
<tr>
<td>Intrinsic Error or Influence Quantity</td>
<td><strong>Reference Conditions or Specified Operating Range</strong></td>
<td><strong>Designation Code</strong></td>
<td><strong>Requirements or Test in Accordance with the Relevant Parts of IEC 1557</strong></td>
<td><strong>Type of Test</strong></td>
</tr>
<tr>
<td>Intrinsic error</td>
<td>Reference conditions</td>
<td>A</td>
<td>Part 5, 6.1</td>
<td>R</td>
</tr>
<tr>
<td>Position</td>
<td>Reference position ±90°</td>
<td>E1</td>
<td>Part 1, 4.2</td>
<td>R</td>
</tr>
<tr>
<td>Supply voltage</td>
<td>At the limits stated by the manufacturer</td>
<td>E2</td>
<td>Part 1, 4.2, 4.3</td>
<td>R</td>
</tr>
<tr>
<td>Temperature</td>
<td>0°C and 35°C</td>
<td>E3</td>
<td>Part 1, 4.2</td>
<td>T</td>
</tr>
<tr>
<td>Series interference voltage</td>
<td>See 4.2 and 4.3</td>
<td>E4</td>
<td>Part 5, 4.2, 4.3</td>
<td>T</td>
</tr>
<tr>
<td>Resistance of the probes and auxiliary earth electrodes</td>
<td>0 to 100 x RA but ≤ 50 kΩ</td>
<td>E5</td>
<td>Part 5, 4.3</td>
<td>T</td>
</tr>
<tr>
<td>System frequency</td>
<td>99% to 101% of the nominal frequency</td>
<td>E7</td>
<td>Part 5, 4.3</td>
<td>T</td>
</tr>
<tr>
<td>System voltage</td>
<td>85% to 110% of the nominal voltage</td>
<td>E8</td>
<td>Part 5, 4.3</td>
<td>T</td>
</tr>
<tr>
<td rowspan="2">Operating error</td>
<td colspan="2">B = ±(|A| + 1,15 √E21 E22 E23 E24 E25 E26 )</td>
<td>Part 5, 4.3</td>
<td>R</td>
</tr>
<tr>
<td colspan="4">B[%] = ± B/fiducial value x 100%<br />
<br />
A = intrinsic error<br />
En = variations<br />
R = routine test<br />
T = type test</td>
</tr>
<tr>
<td>Measuring range</td>
<td colspan="4">0.020 Ω to 300 kΩ</td>
</tr>
<tr>
<td rowspan="6">Display range</td>
<td colspan="4">0.001 Ω to 2.999 Ω</td>
</tr>
<tr>
<td colspan="4">3.00 Ω to 29.99 Ω</td>
</tr>
<tr>
<td colspan="4">30.0 Ω to 299.9 Ω</td>
</tr>
<tr>
<td colspan="4">0.300 kΩ to 2.999 kΩ</td>
</tr>
<tr>
<td colspan="4">3.00 kΩ to 29.99 kΩ</td>
</tr>
<tr>
<td colspan="4">30.0 kΩ to 299.9 kΩ</td>
</tr>
<tr>
<td rowspan="6">Resolution</td>
<td colspan="4">0.001 Ω</td>
</tr>
<tr>
<td colspan="4">0.01 Ω</td>
</tr>
<tr>
<td colspan="4">0.1 Ω</td>
</tr>
<tr>
<td colspan="4">1 Ω</td>
</tr>
<tr>
<td colspan="4">10 Ω</td>
</tr>
<tr>
<td colspan="4">100 Ω</td>
</tr>
<tr>
<td>Accuracy</td>
<td colspan="4">±(2% of rdg + 2 digit)</td>
</tr>
<tr>
<td>Operating error</td>
<td colspan="4">±(5% of rdg + 5 digit)</td>
</tr>
<tr>
<td>Measuring time</td>
<td colspan="4">Typical 8 seconds with a fixed frequency 30 sec. max. with AFC and complete cycle of all measuring frequencies</td>
</tr>
<tr>
<td>Additional error because of probe-and auxiliary earth electrode resistance</td>
<td colspan="4">RH(RS + 2000 Ω)/RE x 1.25 x 10-6% + 5 digits</td>
</tr>
<tr>
<td>Measuring error of RH and RS</td>
<td colspan="4">Typ. 10% of RE + RS + RH</td>
</tr>
<tr>
<td>Max. probe resistance</td>
<td colspan="4">≤ 1 MΩ</td>
</tr>
<tr>
<td>Max. auxiliary earth electrode resistance</td>
<td colspan="4">≤ 1 MΩ</td>
</tr>
<tr>
<td colspan="5">Automatic check if error is kept within the limits required by IEC61557-5.<br />
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.</td>
</tr>
<tr>
<td colspan="5">Automatic Switchover of Measuring Resolution in Dependence to Auxiliary Earth Electrode Resistance RH</td>
</tr>
<tr>
<td rowspan="4">RH with Umeas = 48 V</td>
<td colspan="4">< 300 Ω</td>
</tr>
<tr>
<td colspan="4">< 6 Ω</td>
</tr>
<tr>
<td colspan="4">< 60 Ω</td>
</tr>
<tr>
<td colspan="4">< 600 Ω</td>
</tr>
<tr>
<td rowspan="4">RH with Umeas = 20 V</td>
<td colspan="4">< 250 Ω</td>
</tr>
<tr>
<td colspan="4">< 2.5 kΩ</td>
</tr>
<tr>
<td colspan="4">< 25 kΩ</td>
</tr>
<tr>
<td colspan="4">< 250 kΩ</td>
</tr>
<tr>
<td rowspan="4">Resolution</td>
<td colspan="4">1 mΩ</td>
</tr>
<tr>
<td colspan="4">10 mΩ</td>
</tr>
<tr>
<td colspan="4">100 mΩ</td>
</tr>
<tr>
<td colspan="4">1 Ω</td>
</tr>
<tr>
<td colspan="5">Selective Measurement of the Earthing Resistance (RE Clamp)</td>
</tr>
<tr>
<td>Measuring method</td>
<td colspan="4">Current and voltage measurement with probe as per EN61557-5 and current measurement in the individual branch with additional current transformer (patent applied for).</td>
</tr>
<tr>
<td>Open circuit voltage</td>
<td colspan="4">20/48 V AC</td>
</tr>
<tr>
<td>Short circuit current</td>
<td colspan="4">250 mA AC</td>
</tr>
<tr>
<td>Measuring frequency</td>
<td colspan="4">94, 105, 111, 128 Hz selected manually or automatically (AFC), 55 Hz (R1)</td>
</tr>
<tr>
<td>Noise rejection</td>
<td colspan="4">120 dB (162/3, 50, 60, 400 Hz)</td>
</tr>
<tr>
<td>Max. overload</td>
<td colspan="4">Max. Urms = 250 V (measurement will not be started)</td>
</tr>
<tr>
<td>Measuring range</td>
<td colspan="4">0.020 Ω to 300 kΩ</td>
</tr>
<tr>
<td rowspan="5">Display range</td>
<td colspan="4">0.001 Ω to 2.999 Ω</td>
</tr>
<tr>
<td colspan="4">3.00 Ω to 29.99 Ω</td>
</tr>
<tr>
<td colspan="4">30.0 Ω to 299.9 Ω</td>
</tr>
<tr>
<td colspan="4">0.300 kΩ to 2.999 kΩ</td>
</tr>
<tr>
<td colspan="4">3.00 kΩ to 29.99 kΩ</td>
</tr>
<tr>
<td rowspan="5">Resolution</td>
<td colspan="4">0.001 Ω</td>
</tr>
<tr>
<td colspan="4">0.01 Ω</td>
</tr>
<tr>
<td colspan="4">0.1 Ω</td>
</tr>
<tr>
<td colspan="4">1 Ω</td>
</tr>
<tr>
<td colspan="4">10 Ω</td>
</tr>
<tr>
<td>Accuracy</td>
<td colspan="4">±(7% of rdg + 2 digit)</td>
</tr>
<tr>
<td>Operating error</td>
<td colspan="4">±(10% of rdg + 5 digit)</td>
</tr>
<tr>
<td>Additional error because of probe- and auxiliary earth typ. electrode resistance</td>
<td colspan="4">RH(RS + 2000 Ω)/RETOTAL x 1.25 x 10-6% + 5 digits</td>
</tr>
<tr>
<td>Measuring error of RH and RS</td>
<td colspan="4">Typ. of 10% of RETOTAL + RS + RH</td>
</tr>
<tr>
<td>Measuring time</td>
<td colspan="4">Typ. 8 sec. with a fixed frequency 30 sec. max. with AFC and complete cycle of all measuring frequencies.</td>
</tr>
<tr>
<td rowspan="2">Minimal current in single branch to be measured</td>
<td><strong>0.5 mA</strong></td>
<td colspan="4">With transformer (1000:1)</td>
</tr>
<tr>
<td>0.1 mA</td>
<td colspan="4">With transformer (200:1)</td>
</tr>
<tr>
<td>Max. interference current through transformer</td>
<td><strong>3 A</strong></td>
<td colspan="4">With transformer (1000:1)</td>
</tr>
<tr>
<td colspan="5">1. With recommended current clamps/transformers.</td>
</tr>
<tr>
<td colspan="5">Resistance Measurement (R~)</td>
</tr>
<tr>
<td>Measuring method</td>
<td colspan="4">Current and voltage measurement</td>
</tr>
<tr>
<td>Measuring voltage</td>
<td colspan="4">20 V AC, square pulse</td>
</tr>
<tr>
<td>Short circuit current</td>
<td colspan="4">> 250 mA AC</td>
</tr>
<tr>
<td>Measuring frequency</td>
<td colspan="4">94, 105, 111, 128 Hz selected manually or automatically (AFC)</td>
</tr>
<tr>
<td>Measuring range</td>
<td colspan="4">0.020 Ω to 300 kΩ</td>
</tr>
<tr>
<td rowspan="6">Display range</td>
<td colspan="4">0.001 Ω to 2.999 Ω</td>
</tr>
<tr>
<td colspan="4">3.00 Ω to 29.99 Ω</td>
</tr>
<tr>
<td colspan="4">30.0 Ω to 299.9 Ω</td>
</tr>
<tr>
<td colspan="4">300 Ω to 2999 Ω</td>
</tr>
<tr>
<td colspan="4">3.00 kΩ to 29.99 kΩ</td>
</tr>
<tr>
<td colspan="4">30.0 kΩ to 299.9 kΩ</td>
</tr>
<tr>
<td rowspan="6">Resolution</td>
<td colspan="4">0.001 Ω</td>
</tr>
<tr>
<td colspan="4">0.01 Ω</td>
</tr>
<tr>
<td colspan="4">0.1 Ω</td>
</tr>
<tr>
<td colspan="4">1 Ω</td>
</tr>
<tr>
<td colspan="4">10 Ω</td>
</tr>
<tr>
<td colspan="4">100 Ω</td>
</tr>
<tr>
<td>Accuracy</td>
<td colspan="4">±(2% of rdg + 2 digit)</td>
</tr>
<tr>
<td>Operating error</td>
<td colspan="4">±(5% of rdg + 5 digit)</td>
</tr>
<tr>
<td>Measuring time</td>
<td colspan="4">Typical 6 seconds</td>
</tr>
<tr>
<td>Max. interference voltage</td>
<td colspan="4">24 V, with higher voltages measurement will not be started</td>
</tr>
<tr>
<td>Max overload</td>
<td colspan="4">Urms max. = 250 V</td>
</tr>
<tr>
<td colspan="5">Resistance Measurement (R DC)</td>
</tr>
<tr>
<td>Measuring method</td>
<td colspan="4">Current- voltage measurement as per IEC61557-4 possible</td>
</tr>
<tr>
<td>Measuring voltage</td>
<td colspan="4">20 V DC</td>
</tr>
<tr>
<td>Short circuit current</td>
<td colspan="4">250 mA DC</td>
</tr>
<tr>
<td>Formation of measured value</td>
<td colspan="4">With 4-pole measurement wires on H, S, ES can be extended without additional error.<br />
Resistances > 1 Ω in wire E can cause additional error of 5m Ω/Ω.</td>
</tr>
<tr>
<td>Measuring range</td>
<td colspan="4">0.020 Ω to 300 kΩ</td>
</tr>
<tr>
<td rowspan="6">Display range</td>
<td colspan="4">0.001 Ω to 2.999 Ω</td>
</tr>
<tr>
<td colspan="4">3.00 Ω to 29.99 Ω</td>
</tr>
<tr>
<td colspan="4">30.0 Ω to 299.9 Ω</td>
</tr>
<tr>
<td colspan="4">300 Ω to 2999 Ω</td>
</tr>
<tr>
<td colspan="4">3.0 kΩ to 29.99 kΩ</td>
</tr>
<tr>
<td colspan="4">30.0 kΩ to 299.9 kΩ</td>
</tr>
<tr>
<td rowspan="6">Resolution</td>
<td colspan="4">0.001 Ω</td>
</tr>
<tr>
<td colspan="4">0.01 Ω</td>
</tr>
<tr>
<td colspan="4">0.1 Ω</td>
</tr>
<tr>
<td colspan="4">1 Ω</td>
</tr>
<tr>
<td colspan="4">10 Ω</td>
</tr>
<tr>
<td colspan="4">100 Ω</td>
</tr>
<tr>
<td>Accuracy</td>
<td colspan="4">±(2% of rdg + 2 digit)</td>
</tr>
<tr>
<td>Operating error</td>
<td colspan="4">±(5% of rdg + 5 digit)</td>
</tr>
<tr>
<td>Measuring sequence</td>
<td colspan="4">Approx. 2 measurements/s</td>
</tr>
<tr>
<td>Measuring time</td>
<td colspan="4">Typical 4 second including reversal of polarity (2-pole or 4-pole)</td>
</tr>
<tr>
<td>Maximum interference voltage</td>
<td colspan="4">≤ 3 V AC or DC, with higher voltages measurement will not be started</td>
</tr>
<tr>
<td>Maximum inductivity</td>
<td colspan="4">2 Henry</td>
</tr>
<tr>
<td>Maximum overload</td>
<td colspan="4">Urms = 250 V</td>
</tr>
<tr>
<td colspan="5">Compensation of Lead Resistance (RK)</td>
</tr>
<tr>
<td colspan="5">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</td>
</tr>
<tr>
<td>Formation of measured value</td>
<td colspan="4">Rdisplay = Rmeasured - Rcompensated2</td>
</tr>
<tr>
<td colspan="5">2. Value of setpoint entry RK = 0.000 Ω, variable from 0.000 to 29.99 Ω by means of measuring adjustment.</td>
</tr>
<tr>
<td colspan="5">Stakeless Ground Loop Measurement (Two Clamp Stakeless)</td>
</tr>
<tr>
<td>Switch position</td>
<td colspan="4">RA 4-pole (two clamp Stakeless)</td>
</tr>
<tr>
<td>Resolution</td>
<td colspan="4">0.001 Ω to 0.1 Ω</td>
</tr>
<tr>
<td>Measuring range</td>
<td colspan="4">0.02 Ω to 199.9 Ω</td>
</tr>
<tr>
<td>Accuracy</td>
<td colspan="4">±(7% rdg + 3 digit)</td>
</tr>
<tr>
<td>Operating error</td>
<td colspan="4">±(10% rdg + 5 digit)</td>
</tr>
<tr>
<td>Measuring voltage</td>
<td colspan="4">Vm = 48 V AC (primary)</td>
</tr>
<tr>
<td>Measuring frequency</td>
<td colspan="4">128 Hz</td>
</tr>
<tr>
<td rowspan="2">Noise current (IEXT)</td>
<td colspan="4">Max. IEXT = 10 A (AC) (RA < 20 Ω)</td>
</tr>
<tr>
<td colspan="4">Max. IEXT = 2 A (AC) (RA > 20 Ω)</td>
</tr>
<tr>
<td colspan="5">Measuring principle: Stakeless measurement of resistance in closed loops using two current transformers.<br />
Automatic range selection.<br />
The information regarding stakeless ground loop measurements is only valid when used in conjunction with the recommended current clamps at the minimum distance specified.</td>
</tr>
</tbody>
</table>
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