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 multifaceted Fluke 345 is packed with features such as a bright, color display to analyze the harmonic spectrum, a lowpass 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 longterm 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 startup current where spurious resets or nuisance circuit breaker tripping occurs
 Load studies – Verify electrical system capacity before adding loads
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 610101 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 613261:1997 A  
Immunity  IEC/EN 613261:1997 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 truerms 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 truerms 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 F^{0} 15 Hz to 22 Hz and 45 Hz to 65 Hz Vacrms > 1V 

Watts measurement (single and threephase) (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 threephase) (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 threephase)  
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 threephase)  
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 threephase)  
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 truerms 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 threephase 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 
 AC/DC current: Clampon measurement of ac current up to 1400 A rms and dc current up to 2000 A without breaking the circuit
 Highest safety rating: 600 V CAT IV power analyzer is rated for use at the service entrance
 Accurate in noisy environments: Clamp meter performs even with distorted waveforms present on electronic loads with lowpass filter
 Data logging: Identify intermittent faults by logging any power quality parameter for minutes, or over a month, including harmonics
 Verify batteries: Direct measurement of dc ripple (%) for battery and dc systems
 Troubleshoot harmonics: Analyze and log harmonics digitally or graphically
 Inrush current: Capture and analyze nuisance tripping, from 3 seconds to 300 seconds
 Easy to use: Easily confirm power meter setup with large backlit color display of waveforms and trends
 USB download: Download logged data with PowerLog application software to view trends and screenshots, analyze and create reports simply.
 Battery eliminator: powers the instrument when pefroming extended logging sessions.
 3Phase power: Built in capability for balanced loads
 View graphs and generate reports: Use power analyzer with included Power Log software
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