4
Specification
Accuracy specifications apply for 18°C – 28ºC, using the rear panel terminals, at 50W load power
(in normal 400W mode), after 30 minutes operation at the set conditions; regulation specifies
variation at other powers. Setting accuracies apply with slew rate at the ‘Default’ setting.
Superscript references are to footnotes on page 7, which provide further clarification.
INPUT
Maximum Input Ratings
Current:
80 Amps max. through the rear panel terminals.
30 Amps max. through the front panel terminals.
Voltage:
80 Volts max. while conducting current.
Surge suppressors start to conduct at 120V (nominal),
Max. non-repetitive surge energy: 80 Joules.
Power:
continuous:
(1)
short term mode:
400 Watts max. up to 28ºC, derating to 360 watts at 40ºC.
600 Watts max. up to 28ºC, for up to 60 seconds on-time, with
off-time at least double the on-time.
Minimum Operating Voltage: <2V at 80A; typically equivalent to 25m
Ω
above 100mV (at 4A).
Off State Leakage:
<10 mA (including voltage sense circuit input resistance).
Reverse Polarity:
Diode will conduct; 80 Amps max.
Isolation Voltage:
± 300Vdc max, either load input to chassis ground.
Input Terminals
Rear Panel Input:
Safety terminals accepting 5mm diameter wire, or 8mm spades, at
80 Amps max. or 4mm plugs at 30 Amps max.
Front Panel Input:
Safety terminals accepting 4mm diameter wire, 4mm plugs or 6·5mm
spades. 30 Amps max.
External Voltage Sense
Connection:
Terminal block on rear panel. Sense selection by slide switch.
Input Impedance:
680k
Ω
each input to load negative.
Max. Sense Voltage Offset:
6V (allowance for backing-off supply for zero volt operation).
OPERATING MODES
Constant Current Mode (CC)
Current Ranges:
0 to 8 A (1 mA resolution) and 0 to 80 A (10 mA resolution).
Setting Accuracy:
± 0·2% ± 30 mA.
Regulation:
< 30 mA for 90% load power change (V > 2 Volts).
Temperature Coefficient:
< (±0·02% ± 5 mA) per ºC.
(2)
Slew Rate Ranges:
8 A range:
2·5 Amp per s to 250 Amp per ms.
80 A range:
25 Amp per s to 2500 Amp per ms.
(3)
Minimum transition time: 50 µs.
Constant Power Mode (CP)
Power Range:
0 to 400 (or 600) Watts.
Setting Accuracy:
± 0·5% ± 2 W ± 30 mA.
Regulation:
< 2% over 5 V to 75 V source voltage change (using remote sense).
Temperature Coefficient:
< (± 0·1% ± 5 mA) per ºC.
(2)
Slew Rate Ranges:
40 W per s to 6000 W per ms.
(3)
Minimum transition time:
150 µs.
Содержание LD400
Страница 1: ...LD400 LD400P 400W DC Electronic Loads INSTRUCTION MANUAL ...
Страница 54: ...Book Part No 48511 1730 Issue 2 ...
