描述：**Features * **Constant current (CC), resistance (CR), voltage (CV) and power (CP) operation** * **ide voltage and current range, 0 to 500 V, 0 to 240 A (5000 W max)** * **Low minimum operating voltage of <0.1 V and minimum input resistance of 5 mΩ (model 8518) allowing the load to sink high current at low voltages, required for fuel and solar cell applications** * **Selected models operate up to 500 V, suitable for high voltage applications** * **Built-in transient generator** * **Short circuit test** * **Built-in high resolution (0.1 mA/1 mV) voltage and current measurement (models 8500 and 8502)** * **Bright, easy to read display (VFD technology)** * **Over-Current/Over-Voltage/Over-Power/Over-Temperature Protection** * **RS232 to TTL serial converter cable and application software included** * **List mode operation for increased throughput.** * **Battery testing mode to provide A*hr rating of battery (ending voltage level is adjustable)** * **Flexible triggering: Create trigger events by front panel keystroke, back panel TTL signal, or software** * **Remote voltage sensing to compensate for the effect of voltage drop in wires** * **Store 25 instrument setups** * **Thermostatically-controlled fans allow operation in quiet environments with minimal disruption** * **All models are rack mountable. Compact 300 W and 600 W models for bench use