User guide

5 Fluke Corporation 1740 Series Three-Phase Power Quality Loggers Memobox
Voltage and current measurement
Input voltage
Input range V
I
P-N max 480 V ac
Input range V
I
P-P max 830 V ac
Max. overload voltage 1.2 V
I
Input range selection By job programming
Connections P-P or P-N, 1- or 3-phase
Nominal voltage V
N
≤ 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 uncertainty 0.1 % of V
I
Voltage transformer Ratio: < 999 kV / V
I
Ratio selection By job programming
Current input with Flexi-Set
Input ranges I
I
(L1 or A, L2 or B, L3 or C, N) 15 A/150 A/1500 A/3000 A ac
Measuring range 0.75 A to 3000 A ac
Intrinsic uncertainty < 2 % of I
I
Position influence Max. ± 2 % of measured value – for distance conductor to meas. head > 30 mm
Stray field influence < ± 2 A ac for I
ext
= 500 A ac and distance to measuring head > 200 mm
Temperature coefficient < 0.05 %/K
Current transformer
Ratio
≤ 999 kA/I
I
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
Current input for clamp
Input ranges I
I
(L1 or A, L2 or B, L3 or C, N) 0.5 V nominal (for I
I
) 1.4 Vpeak
Intrinsic uncertainty < 0.3 % of I
I
Max. overload 10 V ac
Input resistance
App. 8.2 k
Ω
Current transformer
Ratio
≤ 999 kA/I
I
Ration selection By job programming
Power configurations Delta, 2-Element Delta, Wye, Single Phase, Split Single Phase