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Keeping Your World Up & Running®
Keeping Your World Up & Running®
Rugged and reliable, this stakeless earth ground clamp is perfect for industrial environments. High-quality, the heavy-duty clamp jaw stays in alignment and calibration, and users can identify ground loop resistance without the need to disconnect then reconnect the earth electrode from the system.
Rugged and reliable, this stakeless earth ground clamp is perfect for industrial environments. High-quality, the heavy-duty clamp jaw stays in alignment and calibration, and users can identify ground loop resistance without the need to disconnect then reconnect the earth electrode from the system.
Simpler, faster earth ground tests than ever before. With internal memory storage of up to 1500 records, users can have a faster setup made easy with the new color-coded wires that help eliminate mistakes.
Features
Applications
Complete three-phase voltage and current measurements 50% faster! We're confident in this because it's been tested at customer sites. The new clamp meters from Fluke (models 377 FC & 378 FC) feature FieldSense™ technology where voltage and current can be measured simultaneously with the clamp jaw. Meaning, these clamp meters can be used to make sequential line-to-ground measurements and current measurements that result in calculated line-to-line voltage measurements and phase rotation information.
In this application note, we walk you through the old versus the new way of doing phase-to-phase measurements along with step-by-step instructions on how to make these measurements.
Read the Application Note
| Temperature Range | |
| Operating Temperature | 14 to 122°F (-10 to 50°C) |
| Storage Temperature | -22 to 140°F (-30 to 60°C) |
| Temperature Coefficient | ±0.1% of reading/°C <18°C >28°C |
| Error | Intrinsic: Refers to the reference temperature range and is guaranteed for one year Operating: Refers to the operating temperature range and is guaranteed for one year |
| Climatic Class | C1 (IEC 654-1), 23 to 115°F (-5 to 45°C), 5 to 95% RH |
| Protective Type | IP56 for case, IP40 for battery door according to EN60529 |
| Safety | Protection by double and/or reinforced insulation maximum 50 V to earth. IEC61010-1: 300V CAT II, Pollution degree two |
| EMC (Emission Immunity) | IEC61326-1: Portable |
| Quality System | Developed, designed, and manufactured according to DIN ISO 9001 |
| External Voltage | V external, maximum = 24 V (dc, ac <400 Hz), measurement inhibited for higher values |
| V Ext Rejection | >120 dB (16²⁄3, 50, 60, 400 Hz) |
| Measuring Time | Typical six seconds |
| Maximum Overload | 250 V rms (pertains to misuse) |
| Auxiliary Power | 6 x 1.5 V Alkaline (type AA LR6) |
| Battery Life Span | Typical >3000 measurements |
| RA 3-Pole Ground Resistance Measurement (IEC 1557-5) | |
| Switch Position | RA 3-pole |
| Resolution | 0.001 to 10 Ω |
| Measuring Range | 0.020 Ω to 19.99 kΩ |
| Accuracy | ±(2% rdg + 3 d) |
| Operating Error | ±(5% rdg + 3 d) |
| Measuring Principle: Current/Voltage Measurement | |
| Measuring Voltage | Vm = 48 V ac |
| Short-Circuit Current | >50 mA |
| Measure Frequency | 128 Hz |
| Probe Resistance (RS) | Maximum 100 kΩ |
| Auxiliary Earth Electrode Resistance (RH) | Maximum 100 kΩ |
| Additional Error from RH and RS | RH[kΩ]RS[kΩ]/RA[Ω]0.2% |
| RA 4-Pole Ground Resistance Measurement (IEC 1557-5) | Switch Position | RA 4-pole |
| Resolution | 0.001 to 10 Ω |
| Measuring Range | 0.020 Ω to 19.99 kΩ |
| Accuracy | ±(2% rdg + 3 d) |
| Operating Error | ±(5% rdg + 3 d) |
| Measuring Principle: Current/Voltage Measurement | |
| Measuring Voltage | Vm = 48 V ac |
| Short-Circuit Current | >50 mA |
| Measure Frequency | 128 Hz |
| Probe Resistance (RS + RES) | Maximum 100 kΩ |
| Auxiliary Earth Electrode Resistance (RH) | Maximum 100 kΩ |
| Additional Error from RH and RS | RH[kΩ]RS[kΩ]/RA[Ω]0.2% |
| Monitoring of RS and RH with error indicator. Automatic range selection. |
|
| RA 3-Pole Selective Ground Resistance Measurement with Current Clamp (RA with Clamp) | Switch Position | RA 3-pole with clamp |
| Resolution | 0.001 to 10 Ω |
| Measuring Range | 0.020 Ω to 19.99 kΩ |
| Accuracy | ±(7% rdg + 3 d) |
| Operating Error | ±(10% rdg + 5 d) |
| Measuring Principle: Current/Voltage Measurement (with External Current Clamp) | |
| Measuring Voltage | Vm = 48 V ac |
| Short-Circuit Current | >50 mA |
| Measure Frequency | 128 Hz |
| Probe Resistance (RS) | Maximum 100 kΩ |
| Auxiliary Earth Electrode Resistance (RH) | Maximum 100 kΩ |
| Monitoring of RS and RH with error indicator. Automatic range selection. Measurement is not performed if the current through the current clamp is too low. |
|
| RA 4-Pole Selective Ground Resistance Measurement with Current Clamp (RA with Clamp) | |
| Switch Position | RA 4-pole with clamp |
| Resolution | 0.001 to 10 Ω |
| Measuring Range | 0.020 Ω to 19.99 kΩ |
| Accuracy | ±(7% rdg + 3 d) |
| Operating Error | ±(10% rdg + 5 d) |
| Measuring Principle: Current/Voltage Measurement (with External Current Clamp) | Measuring Voltage | Vm = 48 V ac |
| Short-Circuit Current | >50 mA |
| Measure Frequency | 128 Hz |
| Probe Resistance (RS) | Maximum 100 kΩ |
| Auxiliary Earth Electrode Resistance (RH) | Maximum 100 kΩ |
| Monitoring of RS and RH with error indicator. Automatic range selection. Measurement is not performed if the current through the current clamp is too low. |
|
| Stakeless Ground Loop Measurement (2 Clamps) | |
| Switch Position | RA 4-pole 2 clamps |
| Resolution | 0.001 to 10 Ω |
| Measuring Range | 0.020 Ω to 19.99 kΩ |
| Accuracy | ±(7% rdg + 3 d) |
| Operating Error | ±(10% rdg + 5 d) |
| Measuring Principle: Stakeless Measurement of Resistance in Closed Loops Using Two Current Transformers | |
| Measuring Voltage | Vm = 48 V ac |
| Measure Frequency | 128 Hz |
| Noise Current (IEXT) | Maximum IEXT = 10 A (ac) (RA <20 Ω) |
| General Specifications | |
| Display | 1999 Digit LCD: Display with special symbols, digit height 25 mm, fluorescent backlight |
| User Interface | Instant measurement through TURN and START one button concept. The only operating elements are rotary switch and START button |
| Robust, Water and Dust Resistant | Instrument is designed for tough environmental conditions (rubber protective cover, IP56) |
| Memory | Internal memory storage up to 1500 records accessible via USB port |
| Dimensions | 9.75 x 5.25 x 7.35" (250 x 133 x 187 mm) |
| Weight | 2.43 lbs (1.1 kg) including batteries 16.8 lbs (7.6 kg) included accessories and batteries in carrying case |
Click on a category to view a selection of compatible accessories with the Fluke 1625-2-KIT Advanced Geo Earth Ground Tester Kit.
| Temperature Range | |
| Operating Temperature | 14 to 122°F (-10 to 50°C) |
| Storage Temperature | -22 to 140°F (-30 to 60°C) |
| Temperature Coefficient | ±0.1% of reading/°C <18°C >28°C |
| Error | Intrinsic: Refers to the reference temperature range and is guaranteed for one year Operating: Refers to the operating temperature range and is guaranteed for one year |
| Climatic Class | C1 (IEC 654-1), 23 to 115°F (-5 to 45°C), 5 to 95% RH |
| Protective Type | IP56 for case, IP40 for battery door according to EN60529 |
| Safety | Protection by double and/or reinforced insulation maximum 50 V to earth. IEC61010-1: 300V CAT II, Pollution degree two |
| EMC (Emission Immunity) | IEC61326-1: Portable |
| Quality System | Developed, designed, and manufactured according to DIN ISO 9001 |
| External Voltage | V external, maximum = 24 V (dc, ac <400 Hz), measurement inhibited for higher values |
| V Ext Rejection | >120 dB (16²⁄3, 50, 60, 400 Hz) |
| Measuring Time | Typical six seconds |
| Maximum Overload | 250 V rms (pertains to misuse) |
| Auxiliary Power | 6 x 1.5 V Alkaline (type AA LR6) |
| Battery Life Span | Typical >3000 measurements |
| RA 3-Pole Ground Resistance Measurement (IEC 1557-5) | |
| Switch Position | RA 3-pole |
| Resolution | 0.001 to 10 Ω |
| Measuring Range | 0.020 Ω to 19.99 kΩ |
| Accuracy | ±(2% rdg + 3 d) |
| Operating Error | ±(5% rdg + 3 d) |
| Measuring Principle: Current/Voltage Measurement | |
| Measuring Voltage | Vm = 48 V ac |
| Short-Circuit Current | >50 mA |
| Measure Frequency | 128 Hz |
| Probe Resistance (RS) | Maximum 100 kΩ |
| Auxiliary Earth Electrode Resistance (RH) | Maximum 100 kΩ |
| Additional Error from RH and RS | RH[kΩ]RS[kΩ]/RA[Ω]0.2% |
| RA 4-Pole Ground Resistance Measurement (IEC 1557-5) | Switch Position | RA 4-pole |
| Resolution | 0.001 to 10 Ω |
| Measuring Range | 0.020 Ω to 19.99 kΩ |
| Accuracy | ±(2% rdg + 3 d) |
| Operating Error | ±(5% rdg + 3 d) |
| Measuring Principle: Current/Voltage Measurement | |
| Measuring Voltage | Vm = 48 V ac |
| Short-Circuit Current | >50 mA |
| Measure Frequency | 128 Hz |
| Probe Resistance (RS + RES) | Maximum 100 kΩ |
| Auxiliary Earth Electrode Resistance (RH) | Maximum 100 kΩ |
| Additional Error from RH and RS | RH[kΩ]RS[kΩ]/RA[Ω]0.2% |
| Monitoring of RS and RH with error indicator. Automatic range selection. |
|
| RA 3-Pole Selective Ground Resistance Measurement with Current Clamp (RA with Clamp) | Switch Position | RA 3-pole with clamp |
| Resolution | 0.001 to 10 Ω |
| Measuring Range | 0.020 Ω to 19.99 kΩ |
| Accuracy | ±(7% rdg + 3 d) |
| Operating Error | ±(10% rdg + 5 d) |
| Measuring Principle: Current/Voltage Measurement (with External Current Clamp) | |
| Measuring Voltage | Vm = 48 V ac |
| Short-Circuit Current | >50 mA |
| Measure Frequency | 128 Hz |
| Probe Resistance (RS) | Maximum 100 kΩ |
| Auxiliary Earth Electrode Resistance (RH) | Maximum 100 kΩ |
| Monitoring of RS and RH with error indicator. Automatic range selection. Measurement is not performed if the current through the current clamp is too low. |
|
| RA 4-Pole Selective Ground Resistance Measurement with Current Clamp (RA with Clamp) | |
| Switch Position | RA 4-pole with clamp |
| Resolution | 0.001 to 10 Ω |
| Measuring Range | 0.020 Ω to 19.99 kΩ |
| Accuracy | ±(7% rdg + 3 d) |
| Operating Error | ±(10% rdg + 5 d) |
| Measuring Principle: Current/Voltage Measurement (with External Current Clamp) | Measuring Voltage | Vm = 48 V ac |
| Short-Circuit Current | >50 mA |
| Measure Frequency | 128 Hz |
| Probe Resistance (RS) | Maximum 100 kΩ |
| Auxiliary Earth Electrode Resistance (RH) | Maximum 100 kΩ |
| Monitoring of RS and RH with error indicator. Automatic range selection. Measurement is not performed if the current through the current clamp is too low. |
|
| Stakeless Ground Loop Measurement (2 Clamps) | |
| Switch Position | RA 4-pole 2 clamps |
| Resolution | 0.001 to 10 Ω |
| Measuring Range | 0.020 Ω to 19.99 kΩ |
| Accuracy | ±(7% rdg + 3 d) |
| Operating Error | ±(10% rdg + 5 d) |
| Measuring Principle: Stakeless Measurement of Resistance in Closed Loops Using Two Current Transformers | |
| Measuring Voltage | Vm = 48 V ac |
| Measure Frequency | 128 Hz |
| Noise Current (IEXT) | Maximum IEXT = 10 A (ac) (RA <20 Ω) |
| General Specifications | |
| Display | 1999 Digit LCD: Display with special symbols, digit height 25 mm, fluorescent backlight |
| User Interface | Instant measurement through TURN and START one button concept. The only operating elements are rotary switch and START button |
| Robust, Water and Dust Resistant | Instrument is designed for tough environmental conditions (rubber protective cover, IP56) |
| Memory | Internal memory storage up to 1500 records accessible via USB port |
| Dimensions | 9.75 x 5.25 x 7.35" (250 x 133 x 187 mm) |
| Weight | 2.43 lbs (1.1 kg) including batteries 16.8 lbs (7.6 kg) included accessories and batteries in carrying case |
Click on a category to view a selection of compatible accessories with the Fluke 1625-2-KIT Advanced Geo Earth Ground Tester Kit.
