AC and DC current and voltage measurement – ideal tool for troubleshooting and logging on power electronics

The Fluke 345 is more than an electric power meter. Combining the functions of a clamp meter, oscilloscope, data logger and digital power meter into one handy device, the Fluke 345 is ideal for working with variable frequency motor drives, high efficiency lighting and other loads using switching electronics.

The multi-faceted Fluke 345 is packed with features such as a bright, color display to analyze the harmonic spectrum, a low-pass filter to remove high frequency noise and a high EMC immunity design, making the Fluke 345 power analyzer ideal for troubleshooting power quality on switching loads. The internal memory of this electric power meter enables long-term power quality logging for analysis of trends or intermittent problems. Additionally, the Hall Effect clamp meter design makes measurement of dc current possible without the need to break the circuit.

Besides effectively performing basic tasks like measuring power and power factor, the Fluke 345 power meters offer the ease of use, portability and flexibility needed to resolve most power issues in commercial, industrial and residential settings.

- Setup and troubleshoot variable frequency drives and UPS systems - Verify correct operation by measuring key power quality parameters
- Harmonics measurements - Uncover harmonic issues that can damage or disrupt critical equipment
- Inrush capture - Check start-up current where spurious resets or nuisance circuit breaker tripping occurs
- Load studies - Verify electrical system capacity before adding loads

For three phase applications the 1735 and 43- Series II products will provide the same type of results.

Other useful features:

- Delivers accuracy even in noisy environments with distorted waveforms present on electronic loads with low-pass filter
- Logs any power quality parameter, including harmonics, for minutes or for over a month to help identify intermittent faults
- Verifies batteries with direct measurement of DC ripple (%) for battery and DC systems
- Analyzes and logs harmonics digitally or graphically
- Captures and analyzes inrush current nuisance tripping due from 3 seconds to 300 seconds
- Makes it easy to confirm power meter setup with large backlit color display of waveforms and trends
- Downloads logged data via USB with PowerLog application software making it easy to view trends and screenshots, analyze, and create reports
- Powers the instrument without using the battery when performing extended logging sessions
- Provides built in three-phase power measurement capability for balanced loads
- Allows you to view graphs and generate reports with included Power Log software

Specifications | ||

Display | Color transmissive LCD 320 x 240 pixels (70 mm diagonal) with 2 level backlight | |

Power supply | Battery type 1.5 V Alkaline AA MN 1500 or IEC LR6 x 6 | |

Battery life typically | > 10 hours (backlight on full) > 12 hours (backlight reduced) | |

Battery eliminator | Input | 110/230 V 50/60 Hz |

Output | 15 VDC, 300 mA | |

Ambient conditions (for indoor use only) | ||

Reference conditions | All accuracies stated at 23°C ±1°C (73.4°F ±1.8°F) | |

Operating temperature | 0°C to 50°C (32°F to 122°F) | |

Temperature coefficient of current | ? ±0.15% of rdg per °C | |

Temperature coefficient of voltage | ? ±0.15% of rdg per °C | |

Maximum relative humidity | 80% for temperatures up to 31°C (87°F) decreasing linearly to 50% relative humidity at 40°C (104°F) | |

Maximum operating altitude | 2000 m | |

Electrical safety | ||

Maximum safe working voltages | Safety IEC 61010-1 600 V CAT IV double or reinforced insulation, pollution degree 2 Protection IP40; EN60529 | |

Current measurement | 600 VAC rms or DC between uninsulated conductor and ground | |

Voltage measurement | 600 VAC rms or DC between either input terminal and ground, or 825 V between energized phase voltages (delta power config.) | |

EMC | ||

Emission | IEC/EN 61326-1:1997 A | |

Immunity | IEC/EN 61326-1:1997 Annex C Performance Criterion B | |

Mechanical | ||

Dimensions (L x W x D) | 300 x 98 x 52 mm (12 x 3.75 x 2 in) | |

Weight including batteries | 820 g (1.8 lb) | |

Jaw opening | 60 mm | |

Jaw capacity | 58 mm diameter | |

Cleaning | The unit can be cleaned with an Isopropanol impregnated cloth. Do not use abrasives or other solvents. | |

Electrical data | ||

Accuracy | 23°C ±1°C (73.4°F ±1.8°F). See Ambient conditions specifications for temperature coefficients. | |

Current measurement (DC, DC rms, AC rms) | ||

Measuring range | 0 to 2000 A DC or 1400 AC rms | |

Autorange facility | 40 A / 400 A / 2000 A | |

Resolution | 10 mA in 40 A range 100 mA in 400 A range A in 2000 A range | |

Accuracy: DC and DC rms | I > 10 A | ±1.5% rdg ±5 digits |

I < 10 A | ±0.2 A | |

Accuracy: AVG | I > 10 A | ±3% rdg ±5 digits |

I < 10 A | ±0.5 A | |

Accuracy: Pk | I > 10 A | ±5% rdg ±5 digits |

I < 10 A | ±0.5 A | |

Accuracy: AHr | I > 10 A | ±2% rdg ±5 digits |

I < 10 A | ±0.5 AHr | |

Accuracy: CF (Crest Factor) | 1.1 ? CF < 3 | ±3% rdg ±5 digits |

3 ? CF < 5 | ±5% rdg ±5 digits | |

Resolution | 0.01 | |

Accuracy: RPL (Ripple) | 2% ? RPL < 100% | ±3% rdg ±5 digits |

100% ? RPL < 600% | ±5% rdg ±5 digits | |

Resolution | 0.1% | |

I DC > 5 A, I AC > 2 A | ||

All measurements DC and 15 Hz to 1 kHz Maximum overload 10,000 A or rms x frequency < 400,000 Amps rms is a true-rms measurement (AC + DC) | ||

Voltage measurement (DC, DC rms, AC rms) | ||

Measuring range | 0 to 825 VDC or AC rms | |

Autorange facility | 4 V / 40 V / 400 V / 750 V | |

Resolution | 1 mV in 4 V range 10 mV in 40 V range 100 mV in 400 V range 1 V in 750 V range | |

Accuracy: DC and DC rms | V > 1 V | ±1% rdg ±5 digits |

V < 1 V | ±0.02 V | |

Accuracy: AVG | V > 1 V | ±3% rdg ±5 digits |

V < 1 V | ±0.03 V | |

Accuracy: Pk | V > 1 V | ±5% rdg ±5 digits |

V < 1 V | ±0.03 V | |

Accuracy: CF (Crest Factor) | 1.1 ? CF < 3 | ±3% rdg ±5 digits |

3 ? CF < 5 | ±5% rdg ±5 digits | |

Resolution | 0.01 | |

Accuracy: RPL (Ripple) | 2% ? RPL < 100% | ±3% rdg ±5 digits |

100% ? RPL < 600% | ±5% rdg ±5 digits | |

Resolution | 0.1% | |

VDC > 0.5 V, VAC > 0.2 V | ||

All measurements DC and 15 Hz to 1 kHz Maximum overload 1,000 V rms Volts rms is a true-rms measurement (AC + DC) | ||

Harmonics | ||

THD (Total Harmonic Distortion) | 1% ? THD < 100% | ±3% rdg ±5 digits |

100% ? THD < 600% | ±5% rdg ±5 digits | |

Resolution | 0.1% | |

DF (Distortion Factor) | 1% ? DF < 100% | ±3% rdg ±5 digits |

Resolution | 0.1% | |

H02 ? Vharm < H13 | ±5% ±2 digits | |

H13 ? Vharm ? H30 | ±10% ±2 digits | |

All measurements up to 30th harmonic (40th harmonic for 15 Hz to 22 Hz) Frequency range of fundamental F0 15 Hz to 22 Hz and 45 Hz to 65 Hz Vacrms > 1V | ||

Watts measurement (single and three-phase) (DC, DC rms, AC rms) | ||

Measuring range | 0 to 1650 kW DC or 1200 kW AC | |

Measuring range | 4 kW, 40 kW, 400 kW, 1650 kW | |

Resolution | 1 W in 4 kW 10 W in 40 kW 100 W in 400 kW 1 kW in 1200 kW | |

Accuracy | 2.5% rdg ±5 digits W1Ø < 2 kW ±0.08 kW W3Ø < 4 kW ±0.25 kW | |

VA measurement (single- and three-phase) (DC, DC rms, AC rms) | ||

Measuring range | 0 to 1650 kVA DC or 1200 kVA AC | |

Autorange facility | 4 kVA, 40 kVA, 400 kVA, 1650 kVA | |

Resolution | 1 VA in 4 kVA 10 VA in 40 kVA 100 VA in 400 kVA 1 kVA in 1200 kVA | |

Accuracy | VA > 2 kVA | 2.5% rdg ±5 digits |

VA < 2 kVA | ±0.08 kVA | |

VAR measurement (single- and three-phase) | ||

Measuring range | 0 to 1250 kVAR | |

Autorange facility | 4 kVAR, 40 kVAR, 400 kVAR, 1200 kVAR | |

Resolution | 1 VAR in 4 kVAR 10 VAR in 40 kVAR 100 VAR in 400 kVAR 1 kVAR in 1200 kVAR | |

Accuracy | VAR > 4 kVAR | ±2.5% rdg ±5 digits |

VAR < 4 kVAR | ±0.25 kVAR | |

Power factor range | 0.3 < PF < 0.99 | |

Power factor (single- and three-phase) | ||

Measuring range | 0.3 capacitive to 1.0 and 1.0 to 0.3 inductive (72.5° capacitive to 0° and 0° to 72.5° inductive) | |

Resolution | 0.001 | |

Accuracy | ±3° | |

Frequency range | 15 Hz to 1 kHz | |

Displacement power factor (single- and three-phase) | ||

Measuring range | 0.3 capacitive to 1.0 and 1.0 to 0.3 inductive (72.5° capacitive to 0° and 0° to 72.5° inductive) | |

Resolution | 0.001 | |

Accuracy | ±3° | |

Frequency range | 15 Hz to 22 Hz and 45 Hz to 65 Hz | |

Kilowatt hour (kWHr) | ||

Measuring range | 40,000 kWHr | |

Autorange facility | 4 kWHr, 40 kWHr, 400 kWHr, 4,000 kWHr, 40,000 kWHr | |

Resolution | 1 WHr in 4 kWHr Range 10 WHr in 40 kWHr Range 100 WHr in 400 kWHr Range 1 kWHr in 4,000 kWHr Range 10 kWHr in 40,000 kWHr Range | |

Accuracy | kWHr > 2 kWHr | ±3% ±5 digits |

kWHr < 2 kWHr | ±0.08 kWHr | |

All Watts /VA /VAR /PF measurements | Frequency range | DC and 15 Hz to 1 kHz |

Current range | 10 A to 1400 A rms | |

Voltage range | 1 V to 825 V rms | |

Maximum input | 825 V rms / 1400 A rms | |

Maximum overload | 1000 V rms / 10,000 A All measurements DC and 15 Hz to 1 kHz. Maximum overload 10,000 A or rms x frequency < 400,000 | |

Frequency measurement (from current or voltage sources) | ||

Measuring range | 15 Hz to 1 kHz | |

Resolution | 0.1 Hz | |

Accuracy | 15 to 22 Hz ±0.5% rdg 40 Hz to 70 Hz ±0.5% rdg 15 Hz to 1000 Hz ±1% rdg | |

Current range | 10 A to 1400 A rms | |

Voltage range | 1 V to 825 V rms | |

Scope function | ||

Current measurement | Range | 10 A / 20 A / 40 A / 100 A / 200 A / 400 A / 1000 A / 2000 A |

Resolution | 1 A in 40 A 10 A in 400 A 50 A in 2000 A | |

Accuracy | ±3% rdg ±1 pixel | |

Maximum overload | 10,000 A | |

Voltage measurement | Range | 4 V / 10 V / 20 V / 40 V / 100 V / 200 V / 400 V / 1000 V |

Resolution | 100 mV in 4 V 1 V in 40 V 10 V in 400 V 31.25 V in 1000 V | |

Accuracy | ±2% rdg ±1 pixel | |

Maximum overload | 1000 V rms | |

Frequency range | DC and 15 Hz to 600 Hz | |

Time base | 2.5 ms, 5 ms, 10 ms, 25 ms, 50 ms/div | |

Refresh rate | 0.5 seconds | |

Maximum sampling rate | 15.625 kHz | |

Inrush current function | ||

Ranges | 40 A, 400 A, and 2000 A | |

Resolution | 10 mA in 40 A range 100 mA in 400 A range 1 A in 2000 A range | |

Accuracy | I > 10 A | ±5% rdg ±1 pixel |

I < 10 A | ±0.5 A | |

All measurements DC and 15 Hz to 1 kHz | ||

Maximum overload | Maximum overload 10,000 A or rms x frequency < 400,000 Amps rms is a true-rms measurement (AC + DC) | |

Capture time | 1 s, 3 s, 10 s, 30 s, 100 s, and 300 s | |

Maximum sampling rate | 15.625 kHz | |

Interface | ||

USB Interface to a PC | Power Log software for download, analysis and reporting 345 Upgrade Utility for installing a new firmware version | |

Logging Memory | ||

Logging areas | Three areas that can be used individually or combined into one large area | |

Averaging periods | 1 s, 2 s, 5 s, 10 s, 30 s, 1 min, 5 min, 10 min, 15 min, and custom | |

Logging Times | ||

Volts and current mode | Average time | Logging time (1 area) |

1 s | 1 h 49 m | |

2 s | 3 h 38 m | |

5 s | 9 h 6 m | |

10 s | 18 h 12 m | |

30 s | 2 d 6 h 36 m | |

1 min | 4 d 13 h 12 m | |

5 min | 22 d 18 h 0 m | |

10 min | 45 d 12 h 0 m | |

15 min | 68 d 6 h 0 m | |

Logging time (3 areas) | ||

1 s | 5 h 12 m | |

2 s | 10 h 24 m | |

5 s | 1 d 2 h 00 m | |

10 s | 2 d 4 h 00 m | |

30 s | 6 d 12 h 1 m | |

1 min | 13 d 0 h 12 m | |

5 min | 65 d 0 h 15 m | |

10 min | 130 d 0 h 30 m | |

15 min | 195 d 0 h 45 m | |

V and A harmonics mode | Average time | Logging time (1 area) |

1 s | 0 h 34 m | |

2 s | 1 h 8 m | |

5 s | 2 h 52 m | |

10 s | 5 h 44 m | |

30 s | 17 h 13 m | |

1 m | 1 d 10 h 26 m | |

5 m | 7 d 4 h 10 m | |

10 m | 14 d 8 h 20 m | |

15 m | 21 d 12 h 30 m | |

Logging time (3 areas) | ||

1 s | 1 h 38 m | |

2 s | 3 h 16 m | |

5 s | 8 h 11 m | |

10 s | 16 h 23 m | |

30 s | 2 d 1 h 11 m | |

1 m | 4 d 2 h 23 m | |

5 m | 20 d 11 h 25 m | |

10 m | 81 d 0 h 50 m | |

15 m | 121 d 13 h 15 m | |

Single- and three-phase power mode | Average time | Logging time (1 area) |

1 s | 1 h 40 m | |

2 s | 3 h 21 m | |

5 s | 8 h 22 m | |

10 s | 16 h 45 m | |

30 s | 2 d 2 h 17 m | |

1 m | 4 d 4 h 35 m | |

5 m | 20 d 22 h 55 m | |

10 m | 41 d 21 h 50 m | |

15 m | 62 d 20 h 45 m | |

Logging time (3 areas) | ||

1 s | 4 h 47 m | |

2 s | 9 h 34 m | |

5 s | 23 h 57 m | |

10 s | 1 d 23 h 54 m | |

30 s | 5 d 23 h 25 m | |

1 m | 11 d 23 h 25 m | |

5 m | 59 d 21 h 5 m | |

10 m | 119 d 18 h 10 m | |

15 m | 179 d 15 h 15 m |

- Combines the functions of a power analyzer, power quality logger, scope, data logger, and clamp meter in one handy tool
- Measures AC current to 1400 A RMS and DC current to 2000 A without breaking the circuit
- Carries the highest safety rating: 600 V CAT IV rated for use at the service entrance