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LD400P

• Versatile solution for testing dc power sources
• Constant current, resistance, conductance, voltage and power modes
• Wide voltage and current range, 0 to 80V and 0 to 80A
• 400 watts continuous dissipation at 28oC (360W at 40oC)
• 600 watts short-term dissipation (up to 60 seconds)
• Low minimum operating voltage of <1V at 40A
• High resolution and accuracy for level setting
• Built-in transient generator with variable slew
• Current monitor output for waveform viewing
• Variable drop-out voltage for battery testing
• High resolution backlit graphic LCD with soft key control
• Analog remote control of levels and TTL control of on/off
  and transient switching
• Front and rear input terminals (front terminals 30A max.)
• Full bus control via USB, RS232, GPIB and LXI compliant LAN interfaces (LD400P)

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: 400 Watts max. up to 28ºC, derating to 360 watts at 40ºC.
(1) Power Short Term: 600 Watts max. up to 28ºC, for up to 60 seconds on-time, with off time 
at least double the on time.
Min. Operating Volts: <2V at 80A; typically equivalent to 25 mOhm 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 up to
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 up to 30 Amps max.

External Voltage Sense
Connection: Terminal block on rear panel. Sense selection by slide switch. 
Input Impedance: 680kOhm each input to load negative.
Max. Sense 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).
Temp. 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) Min. transition time: 50 µs.

Constant Power Mode (CP)
Power Range: 0 to 400 (or 600) Watts.
Setting Accuracy: ± 0.5% ± 2 W ± 30mA).
Regulation: < 2% over 5 V to 75 V source voltage change (using remote sense).
Temp. Coefficient: <(± 0.1% ± 5mA) per ºC.
(2) Slew Rate Ranges: <40 W per s to >6000 W per ms.
(3) Min. transition time: 150 µs.

Constant Resistance Mode (CR)
Resistance Ranges: 0.04 to 10Ohm (0.01Ohm resolution); 2 to 400Ohm (0.1Ohm resolution).
Setting Accuracy: ±0.5% ± 2 digits ± 30 mA. 
Regulation: < 2% for 90% load power change (V > 2 Volts, using remote sense).
Tem. Coefficient: < (±0.04% ± 5 mA ) per ºC. 
(2) Slew Rate Ranges: 10Ohm range: <1Ohm per s to 100Ohm per ms. 
400Ohm range: <40Ohm per s to 4000Ohm per ms.
(3) Min. transition time: 150 µs.

Constant Conductance Mode (CG)
Conductance Ranges: <0.01 to 1 A/V (1 mA/V resolution); <0.2 to 40 A/V (0.01 A/V resolution).
Setting Accuracy: ± 0.5% ± 2 digits ± 30 mA. 
Regulation: < 2% for 90% load power change (V > 2 Volts, using remote sense).
Temp. Coefficient: < (±0.04% ± 5 mA) per ºC. 
(2) Slew Rate Ranges: 1 A/V range: <0.1 A/V per s to >10 A/V per ms. 
40 A/V range: <4 A/V per s to >400 A/V per ms.
(3) Min. transition time: 150 µs.

Constant Voltage Mode (CV)
Voltage Ranges: Vmin to 8 V (1 mV resolution) and Vmin to 80 V (10 mV resolution).
Vmin depends on current: typically <2V at 80A
Setting Accuracy: ± 0.2% ± 2 digits.
Regulation: < 30 mV for 90% load power change (using remote sense).
Temp. Coefficient: < (0.02% + 1 mV) per ºC.
(2) Slew Rate Ranges: 8 V range: <0.8 V per s to >80 V per ms.
80 V range: <8 V per s to >800 V per ms.
(3) Min. transition time: 150 µs.

TRANSIENT CONTROL

Transient Generator
Pulse Repetition Rate: Adjustable from 0.01Hz (100 seconds) to 10kHz.
Pulse Duty Cycle: 1% to 99% (percentage of period at Level A).
Setting Accuracy: ±1 %
Slew Rate Control
The slew rate control applies to all changes of level whether caused by manual selection, remote control or the transient generator. The level change is a linear slew between the two level settings. The range available in each mode is shown above.
Setting Accuracy: ± 10% (on linear part of slope, excluding high frequency aberrations).
Variation in Level 
Settings: ± 5 digits of specified setting resolution for present mode and range.
Oscillator Sync Output
Connection: Terminal block on rear panel. Opto-isolated open collector output 
conducts during Level B phase of internal transient generator.
Ratings: Max Off State Voltage: 30V. Collector Current: 2mA (typical).

DROPOUT VOLTAGE

The load will cease to conduct if the applied voltage falls below the Dropout Voltage setting; active in all modes except Constant Voltage. The Dropout Voltage setting is also the threshold for the Slow Start facility and acts as an offset voltage in Constant Resistance mode.
Setting Accuracy: ± 2% ± 20mV.
Slow Start
If Slow Start is enabled, the load will not conduct any current until the source voltage reaches the Dropout Voltage setting; it will then ramp the controlled variable up (in CC, CP and CG modes) or down (in CR and CV modes) to the Level setting at a rate determined by the Slew Rate setting.

METER SPECIFICATIONS

Display Type: 256 x 112 pixel backlit graphic LCD.
Measured Values
Volts & Amps: Measured values of current through and voltage across the load.
Watt & Ohms: Power and equivalent load resistance, calculated from Volts and Amps. 
Voltage Accuracy: ± 0.1% ± 2 digits.
Current Accuracy: ± 0.2% ± 3 digits.

CURRENT MONITOR OUTPUT

Output Terminals: 4mm safety sockets on front panel or terminal block on rear panel.
Output Impedance: 600W nominal, for >1MW load (e.g. oscilloscope)
Scaling: 50mV per Amp (4 Volts full scale).
Accuracy: ± 0.5% ± 5mV.
Common Mode Range: ± 3V dc max. See note (4).

ANALOG REMOTE CONTROL (LD400 and LD400P)

External Control Input Characteristics
Connection: Terminal block on rear panel.
Input Impedance: 400kOhm each input to load negative.
Common Mode
Range: ± 100V to load negative.
External Analogue Voltage Control
Operating Mode: The applied voltage sets the operating level within the selected range.
Scaling: 4 Volts full scale.
Accuracy: ± 2% ± accuracy of selected range.
Common Mode
Rejection: Better than –66dB.
External Logic Level (TTL) Control
Operating Mode: The applied signal selects between Level A and Level B settings.
Threshold: + 1.5V nominal. A logic high selects Level B.
Remote Disable Input
Connection: Terminal block on rear panel. 
Input to the LED of an opto-isolator through 1kW resistor.
Threshold: Apply >+3V to disable load input (+12V maximum).

DIGITAL REMOTE CONTROL (LD400P only)

Digital Remote Interfaces
The LD400P model provides LAN, USB, GPIB and RS232 interfaces for full remote control.
LAN: Ethernet 100/10base-T connection with auto cross-over detection. LXI v1.4 Core 2011 compliant.
USB: Standard USB 2.0 connection. Operates as virtual COM port.
GPIB: Conforming to IEEE488.1 and IEEE488.2.
Capabilities: SH1, AH1, T6, L4, SR1, RL2, PP1, DC1, DT0, C0, E2.
RS232: Standard 9-pin D connection. Baud rate: 9600.

PROTECTION

Excess Power: The unit will attempt to limit the power to approx 430 Watts; if this fails the unit will trip into the fault state at about 460 Watts. If intermittent mode operation is enabled, these levels are 610W and 630W.
Protection Current: The input is disabled if the measured current exceeds a user set limit.
Excess Current: The unit will trip into the fault state at nominally 92 Amps.
Protection Voltage: The input is disabled if the measured voltage exceeds a user set limit.
Excess Voltage: The unit will conduct a current pulse (to absorb inductively generated spikes) for 1ms at about 90V.
The unit will trip into the fault state at nominally 106V
Surge suppressors will start to conduct above 120V.
Temperature: The unit will trip into the fault state if the heatsink temperature exceeds safe levels.
Sense Error: The unit will trip into the fault state if the external voltage sense is more than 6V below the internal sense.

GENERAL

AC Input: 110V–120V or 220V–240V AC ±10%, 50/60Hz. Installation Category II.
Power Consumption: 30VA max. Mains lead rating 6A.
Operating Range: + 5ºC to + 40ºC, 20% to 80% RH.
Storage Range: – 40ºC to + 70ºC.
Environmental: Indoor use at altitudes up to 2000m, Pollution Degree 2.
Cooling: Variable speed fan. Air exit at rear.
Safety: Complies with EN61010-1 and EN61010-2-030.
EMC: Complies with EN61326.
Size: 130mm H (3U) x 212mm W (½ rack) x 435mm D.
Weight: 5.7 kg.

OPTIONS

Option: 19-inch rack mount kit.

Specification Notes
(1) In 600 Watt short-term operation mode the dynamic response is not specified, and both the slew rate and the transient oscillator frequency range are restricted. The slew rate limitation applies also to external voltage control. This mode is primarily intended for limited duration operation at a fixed level setting.
(2) Slew Rate Ranges refer to the theoretical slope of the transition between two levels, regardless of whether that transition can be achieved when taking into account the level difference, the set transition duration, the minimum transition time, and the characteristics of the source.
(3) Minimum Transition Time specification is an indication of the fastest available transition using a benign battery source and low inductance connections, with a minimum terminal voltage of 5V and a minimum current of 1A. The actual performance attainable with electronically regulated power supplies depends on the combination of source and load loop bandwidths and interconnection inductance. 
(4) The common mode capability of the current monitor is to provide tolerance of voltage drops in the cables. The monitor negative must be connected at some point to the load negative circuit.

Accuracy specifications apply for 18°C – 28ºC, 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.