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The Fluke 1625 earth ground tester is able to measure earth ground loop resistances using only clamps. With this test method, two clamps are placed around the earth ground rod and each are connected to the tester. The Fluke 1625 features, Automatic Frequency Control (AFC) - identifies existing interference and chooses a measurement frequency to minimize its effect, providing more accurate earth ground value. Also, R* measurement - calculates earth ground impedance at 55 Hz to more accurately reflect the earth ground resistance that a fault-to-earth ground would see. Specifications. Operating temperature: 0 °C to 35 °C (32 °F to 95 °F). Temperature coefficient: ± 0.1 % of reading/K. RA 3-pole ground resistance measurement (IEC 1557-5). Measuring range: 0.001 ohm to 19.99 kohm. Resolution: 0.001 ohm to 10 ohm. Intrinsic error: ± (2 % rdg + 3 d). Operating error: ± (5 % rdg + 3 d). RA 4-pole ground resistance measurement (IEC 1557-5). Measuring range: 0.001 ohm to 19.99 kohm. Resolution: 0.001 ohm to 10 ohm. Intrinsic error: ± (2 % rdg + 3 d). Operating error: ± (5 % rdg + 3 d). RA 3-pole selective ground resistance measurement with current clamp. Measuring range: 0.001 ohm to 19.99 kohm. Resolution: 0.001 ohm to 10 ohm. Intrinsic error: ± (7 % rdg + 3 d). Operating error: ± (10 % rdg + 5 d). RA 4-pole selective ground resistance measurement with current clamp. Measuring range: 0.001 ohm to 19.99 kohm. Resolution: 0.001 ohm to 10 ohm. Intrinsic error: ± (7 % rdg + 3 d). Operating error: ± (10 % rdg + 5 d). Stakeless ground loop measurement. Measuring range: 0.001 ohm to 19.99 kohm. Resolution: 0.001 ohm to 10 ohm. Intrinsic error: ± (7 % rdg + 3 d). Operating error: ± (10 % rdg + 5 d). Measurement of interference voltage dc + ac (UST). Measuring range: 1 V to 50 V. Resolution: 0.1 V. Frequency Range: dc/ac 45 Hz to 400 Hz sine. Limits of Error: ± (5 % rdg + 5 d). Measurement of interference frequency (F). Measuring range: 6.0 Hz to 400 Hz. Resolution: 0.1 Hz to 1 Hz. Range: 1 V to 50 V. Limits of Error: ± (1 % rdg + 2 d). Resistance measurement (R ac). Measuring range: 0.020 ohm to 300 kohm. Resolution: 0.001 ohm to 100 ohm. Intrinsic error: ± (2% rdg + 2 d). Operating error: ± (5 % rdg + 5 d). Resistance measurement (R dc). Measuring range: 0.020 ohm to 3 kohm. Resolution: 0.001 ohm to 1 ohm. Intrinsic error: ± (2% rdg + 2 d). Operating error: ± (5 % rdg + 5 d).
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