The Fluke 1621 is an easy-to-use earth ground tester. For ground resistance testing, the 1621 is the first line of defense in detecting reliable ground connections. The unit features basic ground testing methods including 3-pole Fall-of-Potential as well as 2-pole ground resistance tests. Its convenient size, rugged holster, and large, clear LCD display make it an ideal field earth ground tester, for most electrical grounding work environments. With a simple user interface and intuitive functionality, the Fluke 1621 is a handy grounding tool for electrical contractors, utility test engineers, and earth ground specialists.
| Measuring Functions | 3-pole earth ground resistance, 2-pole AC resistance of a conductor, interference voltage |
| Intrinsic Error | Refers to the reference temperature range and is guaranteed for one year |
| Measuring Rate | 2 measurements/second |
| Battery | One 9V alkaline (LR61) |
| Battery Condition | LO-BAT displayed if voltage drops below 6.5V |
| Voltages | Between jacks H/C2 and E/C1: 250 Veff max Between jacks S/P2 and E/C1: 250 Veff max |
| Climatic Class | VDE/VDI 3540 RZ (conforming to KWG as per DIN 40040, 4/87) |
| Temperature Performance | Working: -10°C to +50°C (+14°F to +122°F) Operating: 0°C to +35°C (+32°F to +95°F) Storage: -20°C to +60°C (+68°F to +140°F) Reference: +23°C ±2°C (+73°F ±4°F) |
| Temperature Coefficient | ±0.1% of range per degree Kelvin |
| Safety | IEC/EN 61010-1, 600V CAT II, pollution degree 2 |
| Dimensions | 113 × 54 × 216 mm (4.5 × 2.1 × 8.5 in), including holster |
| Weight | 850 g (1.9 lb), including standard accessories (approx. 600 cm³ volume) |
| Note | [1] Remove the battery for long-term storage to prevent leakage damage. [2] The four temperature ranges satisfy European Standards; use the temperature coefficient to determine accuracy at any ambient temperature. |
| Maximum Deviations (Influence Factors) | E Position – 0% E Supply Voltage – 0% E Temperature – 2.3% E Serial Interference Voltage (20V) – 0.6% E Probe and Auxiliary Probe Resistance – 10% |
| Test Voltage | 3.7 kV |
| Protection Type | IP40 (IEC/EN 60529) |
| Electromagnetic Compatibility | Emission: IEC/EN 61326 Class B Immunity: IEC/EN 61326 Annex C |
| RE Resistance Measurement | Measuring method: Current-voltage with improved cross-talk attenuation, 3-pole or 2-pole (IEC/EN 61557-5) Open circuit voltage: 23–24V AC Short circuit current: >50 mA AC Measuring frequency: 128 Hz Maximum overload: 250 Veff |
| Measuring Time | Approx. 8 seconds (average after START pressed) |
| Limit Input | Tester retains set value even when turned off (if sufficient battery power) |
| Automatic Changeover of Resolution | RH < 7 kΩ – Resolution 0.01 Ω RH < 50 kΩ – Resolution 0.1 Ω RH > 50 kΩ – Resolution 1 Ω |
| Interference Voltage Display (DC + AC) | Vmax: 30 Veff Common mode rejection: >80 dB at 50/60 Hz Ri: 680 kΩ Measuring uncertainty: <10% for pure AC and DC signals |
| Range | Resolution / Display / Accuracy |
| 0.15 Ω to 20 Ω | Resolution: 0.01 Ω Display range: 0–19.99 Ω |
| 200 Ω | Resolution: 0.1 Ω Display range: 20–199.9 Ω |
| 2 kΩ | Resolution: 1 Ω Display range: 200–1999 Ω |
| Intrinsic Uncertainty | ±(6% of measured value + 5D) |
| Operating Uncertainty IEC 61557 | ±(18% of measured value + 5D) |
| Notes | [1] Covers all deviations caused by influence quantities E –E . If deviation E (probe resistance) is higher than specified, readings flash. Measured values may be outside the specified operating uncertainty. |
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