393 FC CAT III 1500 V True-rms Clamp Meter with iFlex


With its CAT III 1500 V / CAT IV 600 V safety rating, the 393 FC CAT III 1500 V True-RMS Clamp Meter with iFlex provides exceptional safety for work in dc environments up to 1,500V, like solar arrays, wind power, electric railways, and datacenter battery banks for uninterruptible power supplies. The thin jaw allows it to be used in combiner boxes, inverters, and tight spaces, making it ideal for solar energy applications.


The meter measures up to 1,500V DC, 1,000V AC, and up to 999.9 A DC or ac through the clamp jaw. The included iFlex flexible current probe extends ac current measurements up to 2,500 amps. When measuring ac current, the iFlex probe can be twisted through extremely small spaces giving technicians access to cables that would otherwise be difficult or impossible to clamp a probe around.


  • IP54 rating for dust and water making it ideal for work outdoors on solar arrays and wind power systems
  • DC power measurement, showing readings in kVA
  • Audio and Visual Polarity to ensure photovoltaic panels are properly installed with the help of an audio beep and a light to indicate correct polarity
  • Visual Continuity that provides a bright green indicator light in the display for working in dark and noisy environments
  • Logging, sharing and reporting of test results via Fluke Connect software
Maximum voltage between any Terminal and Earth Ground
Batteries2 AA IEC LR6 alkaline
DisplayDual display with backlight
Automatic Power Off20 minutes
Accuracy is specified for 1 year after calibration, at operating temperatures of 18 to 28°C,
relative humidity at 0 to 75%.
Temperature CoefficientsAdd 0.1 x specified accuracy for each °C > 28°C or < 18°C
AC Current: Jaw
Range999.9 A
Resolution0.1 A
Accuracy2% + 5 digits (10 to 100 Hz)
2.5% + 5 digits (100 to 500 Hz)
Crest Factor (50/60 Hz)2.5 @600.0 A
3.0 @500.0 A
1.42 @999.9 A
Add 2% for C.F. >2
AC Current: Flexible Current Probe
Range999.9 A
2,500 A
Resolution0.1 A (≤999.9 A)
1 A (≤2,500 A)
Accuracy3% RD + 5 digits (10 to 500 Hz)
Crest Factor (50/60Hz)2.5 @1,400 A
3.0 @1,100 A
1.42 @2,500 A
Add 2% for C.F. >2
Position Sensitivity
Distance from Optimumi2500-10 Flexi2500-18 FlexError
A0.5 in. (12.7 mm)1.4 in. (35.6 mm)±0.5%
B0.8 in. (20.3 mm)2 in. (50.8 mm)±1%
C1.4 in. (35.6 mm)2.5 in. (63.5 mm)±2%
DC Current
Range999.9 A
Resolution0.1 A
Accuracy2% RD + 5 digits
AC Voltage
Resolution0.1V (≤600V)
1V (≤1,000V)
Accuracy1% RD + 5 digits (20 to 500 Hz)
DC Voltage
Resolution0.1V (≤600V)
1V (≤1,500V)
Accuracy1% RD + 5 digits
mV dc
Range500 mV
Resolution0.1 mV
Accuracy1% RD + 5 digits
Amps Frequency: Jaw
Range5 to 500 Hz
Resolution0.1 Hz
Accuracy0.5% RD + 5 digits
Trigger Level5 to 10 Hz, ≥10 A
10 to 100 Hz, ≥5 A
100 to 500 Hz, ≥10 A
Amps Frequency: Flexible Current Probe
Range5 to 500 Hz
Resolution0.1 Hz
Accuracy0.5% RD + 5 digits
Trigger Level5 to 20 Hz, ≥25 A
20 to 100 Hz, ≥20 A
100 to 500 Hz, ≥25 A
Voltage Frequency
Range5 to 500 Hz
Resolution0.1 Hz
Accuracy0.5% RD + 5 digits
Trigger Level5 to 20 Hz, ≥5V
20 to 100 Hz, ≥5V
100 to 500 Hz, ≥10V
DC Power
Range600 kVA (600V DC range)
1,500 kVA (1,500V DC range)
Resolution0.1 kVA
1 kVA
Accuracy2% RD + 2 kVA
2% RD + 20 kVA
Range600 Ω
6,000 Ω
60 kΩ
Resolution0.1 Ω (≤600.0 Ω)
1 Ω (≤6,000 Ω)
0.01 kΩ (≤60.00 kΩ)
Accuracy1% RD + 5 digits
Range100 μF
1,000 μF
Resolution0.1 μF (≤100.0 μF)
1 μF (≤1,000 μF)
Accuracy1% RD + 5 digits
Inrush Trigger Level5 A
Size (L x W x H)281 x 84 x 49 mm (11 x 3.3 x 2 in.)
Weight520 g (1.1 lb.)
Jaw Opening34 mm (1.3 in.)
Flexible Current Probe Dia.7.5 mm (0.3 in.)
Operating Temp.-10 to 50°C (14 to 122°F)
Storage Temp.-40 to 60°C (-40 to 140°F)
Operating HumidityNon-condensing (<10°C) (50°F)
≤90% RH (at 10 to 30°C) (50 to 86°F)
≤75% RH (at 30 to 40°C) (86 to 104°F)
≤45% RH (at 40 to 50°C) (104 to 122°F)
Operating Altitude2,000 m (1.2 miles)
Storage Altitude12,000 m (7.5 miles)
Ingress Protection (IP) RatingIEC 60529: IP54 non-operating
Electromagnetic Compatibility (EMC)
InternationalIEC 61326-1: Portable, Electromagnetic Environment,
IEC 61326-2-2 CISPR 11: Group 1, Class A
USA (FCC)47 CFR 15 subpart B.
GeneralIEC 61010-1, Pollution Degree 2
MeasurementIEC 61010-2-032: CAT III 1,500V/CAT IV 600V
IEC 61010-2-033: CAT III 1,500V/CAT IV 600V
Wireless Radio
Radio Frequency Cert.FCC ID: T68-FBLE, IC: 6627A-FBLE
Wireless Radio Frequency Range2,400 to 2,483.5 MHz
Output Power<100 mW
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