Refers to the reference conditions and is guaranteed for two years

 2 years

 2 years recommended

 developed, designed, and manufactured according to DIN ISO 9001

 23 °C ± 2 K; 74 °F ± 2 K , Vm=230 V ± 10%, 50 Hz ± 0.1 Hz or 60 Hz ± 0.1 Hz

Phase sequence:

 L1, L2, L3

Interval length:

 10 minutes

Wye connection:

 (L1, L2, L3 to N)

Power supply:

 88 V ... 265 V AC

Working temp. range:

 -10 °C to 55°C; 14 °F to 131°F

Operating temp. range:

 0 °C to 35°C; 32 °F to 95°F

Storage temp. range:

 -20 °C to 60°C; -4 °F to 140°F

Reference temp. range:

 23 °C ± 2 K; 74 °F ± 2 K

Relative humidity:

 Fluke 1745: Class B2 acc. IEC 60654-1
Fluke 1744/43: Class C2 acc. IEC 60654-1

 robust, fully insulated housing and accessories

Fluke 1745:

 IP50 as per EN 60529

Fluke 1744/1743:

 IP65 as per EN 60529

 IEC/EN 61010-1 600 V CAT III, 300 V CAT IV, pollution degree 2, double insulation

 5.2 kV rms, 50 Hz / 60 Hz, 5 s

Emission:

 IEC/EN 61326-1, EN55022

Immunity:

 IEC/EN 61326-1

Input range VI P-N:

 max 480 V AC

Input range VI P-P:

 max 830 V AC

Max. overload voltage:

 1.2 VI

Input range selection:

 By job programming

Connections:

 P-P or P-N, 1- or 3-phase

Nominal voltage VN:

 <= 999 kV with PTs and ratio

Input resistance:

 App. 820 kΩ per chan. Lx-N Single phase (L1 or A, L2 or B, L3 or C connected): app. 300 kΩ

Intrinsic uncenrtainty:

 0.1 % of VI

Voltage transformer:

 Ratio: <999 kV / VI

Ration selection:

 By job programming

Input ranges II L1 or A, L2 or B, L3 or C, N:

 15 A / 150 A / 1500 A / 3000 A ac

Measuring range:

 0.75 A … 3000 A ac

Intrinsic uncertainty:

 < 2 % of II

Position influence:

 Max. ± 2 % of measured value – for distance conductor to meas. head > 30 mm

Stray field influence:

 < ± 2 A ac for Iext=500 A ac and distance to measuring head > 200 mm

Temperature coefficient:

 < 0.05 % / K

Current transformer:

 Ratio <= 999 kA / II

Ratio selection:

 By job programming

Connection:

 3-phase, 3-phase +N, 2 phase L1 or A and L3 or C (2 W-meter-method) 7 pole connector

Input ranges II L1 or A,
L2 or B, L3 or C, N:

 0.5 V nominal (for II) 1.4 Vpeak

Intrinsic uncertainty:

 < 0.3 % of II

Max. overload:

 10 V ac

Input resistance:

 App. 8.2 kΩ

Current transformer:

 Ratio Ω 999 kA / II

 Delta, 2-Element Delta, Wye, Single Phase, Split Single Phase

Functional Range:

 88 V to 660 V absolute, 50 Hz / 60 Hz
100 V to 350 V dc Internal fuse: 630 mA T

Power consumption:

 5 Watts

Ride through:

 Fluke 1745: Internal battery for typ. > 5 hours ride through with intelligent power management
Fluke 1743/44: 3 sec Capacitor

Fuse:

 Power supply fuse can be replaced in service facility only. Supply can be connected in parallel to measuring inputs (up to 660 V)

 LEDs for status and voltage levels
Fluke 1745: LC-display with backlight for voltage, current, active power, phase sequence.

 Capacity 8 MB Flash-EPROM

Intervals:

 A function > 12000 intervals for > 85 days with 10 min intervals
P function > 30000 intervals for > 212 days with 10 min intervals

Events:

 > 13000

Memory model:

 linear, circular

 RS 232, 9600...115 000 Baud, automatic Baud rate selection, 3-wire communication

Fluke 1745:

 282 mm x 216 mm x 74 mm (115in x 88in x 33in)

Fluke 1743/1744:

 170 mm x 125 mm x 55 mm (69in x 51in x 22in)

Fluke 1745:

 approx. 3 kg

Fluke 1744/1743:

 approx. 2 kg

A/D converter:

 16 bit, sample rate: 10.24 kHz

Anti-aliasing filter:

 FIR-Filter, fc =4.9 kHz

Frequency response:

 Uncertainty < 1 % of Vm for 40 Hz to 2500 Hz

Interval length:

 1, 3, 5, 10, 30 s, 1, 5, 10, 15, 60 minutes

Averaging time for Min/max values:

 ½, 1 mains period, 200 ms,1 , 3 , 5 s

Time base:

 Resolution: 10 ms (at 50 Hz), deviation: 2s/day at 23 °C; 74 °F ± 2 K