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General Data
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Intrinsic error
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Refers to the reference conditions and is guaranteed for two years
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Warranty
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2 years
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Recalibration interval
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2 years recommended
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Quality system
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developed, designed, and manufactured according to DIN ISO 9001
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Reference conditions
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23 °C ± 2 K; 74 °F ± 2 K , Vm=230 V ± 10%, 50 Hz ± 0.1 Hz or 60 Hz ± 0.1 Hz
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Phase sequence:
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L1, L2, L3
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Interval length:
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10 minutes
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Wye connection:
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(L1, L2, L3 to N)
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Power supply:
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88 V ... 265 V AC
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Environment conditions
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Working temperature range:
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-10 °C to 55°C; 14 °F to 131°F
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Operating temperature range:
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0 °C to 35°C; 32 °F to 95°F
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Storage temperature range:
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-20 °C to 60°C; -4 °F to 140°F
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Reference temperature range:
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23 °C ± 2 K; 74 °F ± 2 K
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Relative humidity:
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Fluke 1745: Class B2 acc. IEC 60654-1
Fluke 1744/43: Class C2 acc. IEC 60654-1
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Housing
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robust, fully insulated housing and accessories
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Protection type
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Fluke 1745:
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IP50 as per EN 60529
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Fluke 1744/1743:
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IP65 as per EN 60529
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Safety
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IEC/EN 61010-1 600 V CAT III, 300 V CAT IV, pollution degree 2, double insulation
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Type test voltage
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5.2 kV rms, 50 Hz / 60 Hz, 5 s
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EMC
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Emission:
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IEC/EN 61326-1, EN55022
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Immunity:
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IEC/EN 61326-1
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Voltage and Current Measurement
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Input voltage
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Input range VI P-N:
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max 480 V AC
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Input range VI P-P:
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max 830 V AC
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Max. overload voltage:
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1.2 VI
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Input range selection:
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By job programming
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Connections:
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P-P or P-N, 1- or 3-phase
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Nominal voltage VN:
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<= 999 kV with PTs and ratio
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Input resistance:
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App. 820 kΩ per chan. Lx-N Single phase (L1 or A, L2 or B, L3 or C connected): app. 300 kΩ
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Intrinsic uncenrtainty:
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0.1 % of VI
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Voltage transformer:
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Ratio: <999 kV / VI
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Ration selection:
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By job programming
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Current input with Flexi Set
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Input ranges II L1 or A, L2 or B, L3 or C, N:
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15 A / 150 A / 1500 A / 3000 A ac
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Measuring range:
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0.75 A … 3000 A ac
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Position influence:
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Max. ± 2 % of measured value – for distance conductor to meas. head > 30 mm
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Stray field influence:
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< ± 2 A ac for Iext=500 A ac and distance to measuring head > 200 mm
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Temperature coefficient:
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< 0.05 % / K
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Current transformer:
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Ratio <= 999 kA / II
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Ratio selection:
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By job programming
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Connection:
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3-phase, 3-phase +N, 2 phase L1 or A and L3 or C (2 W-meter-method) 7 pole connector
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Current input for clamp
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Input ranges II L1 or A, L2 or B, L3 or C, N:
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0.5 V nominal (for II) 1.4 Vpeak
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Intrinsic uncertainty:
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< 0.3 % of II
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Max. overload:
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10 V ac
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Input resistance:
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App. 8.2 kΩ
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Current transformer:
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Ratio Ω 999 kA / II
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Power systems
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Delta, 2-Element Delta, Wye, Single Phase, Split Single Phase
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Logger
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Power supply
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Functional Range:
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88 V to 660 V absolute, 50 Hz / 60 Hz
100 V to 350 V dc Internal fuse: 630 mA T
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Power consumption:
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5 Watts
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Ride through:
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Fluke 1745: Internal battery for typ. > 5 hours ride through with intelligent power management
Fluke 1743/44: 3 sec Capacitor
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Fuse:
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Power supply fuse can be replaced in service facility only. Supply can be connected in parallel to measuring inputs (up to 660 V)
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Display, indicators
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LEDs for status and voltage levels
Fluke 1745: LC-display with backlight for voltage, current, active power, phase sequence.
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Memory
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Intervals:
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Capacity 8 MB Flash-EPROM
A function > 12000 intervals for > 85 days with 10 min intervals
P function > 30000 intervals for > 212 days with 10 min intervals
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Events:
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> 13000
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Memory model:
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linear, circular
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Interface
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RS 232, 9600...115 000 Baud, automatic Baud rate selection, 3-wire communication
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Dimensions
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Fluke 1745:
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282 mm x 216 mm x 74 mm (115in x 88in x 33in)
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Fluke 1743/1744:
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170 mm x 125 mm x 55 mm (69in x 51in x 22in)
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Weight
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Fluke 1745:
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approx. 3 kg
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Fluke 1743/1744:
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approx. 2 kg
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Measurement
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A/D converter:
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16 bit, sample rate: 10.24 kHz
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Anti-aliasing filter:
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FIR-Filter, fc =4.9 kHz
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Frequency response:
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Uncertainty < 1 % of Vm for 40 Hz to 2500 Hz
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Interval length:
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1, 3, 5, 10, 30 s, 1, 5, 10, 15, 60 minutes
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Averaging time for Min/max values:
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½, 1 mains period, 200 ms,1 , 3 , 5 s
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Time base:
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Resolution: 10 ms (at 50 Hz), deviation: 2s/day at 23 °C; 74 °F ± 2 K
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