The PAD-L Power supply is designed for high operation reliability and excellent electrical performance. It is a universal-purpose industrial power supply which can be used as a variable power source for research and development, or as a fixed power source for long time aging test. Features of the PAD-L Power Supply can be summarized as follows: 1. Improved«power factor at low output voltage: A choke input system is used for the rectifier filter circuit, thereby reducing the apparent input current and improving the power factor. This led to a smaller power transformer and consequently to a compact and light power supply. 2. Less waveform distortion caused to the AC input line: As the choke input system is used, the input current waveform is less distorted with harmonics, thereby reducing waveform .. distortion to the AC input line.—......................................................· 3. Excellent temperature coefficient: Very low temperature drift characteristics of 50 ppm/°C is attained by using premium-quality parts, improved circuits, and forced air cooling. Time-elapse drift (aging drift) also is very low. „ .... _ . . . . 4. Fast transient response: A wide-band error amplifier is used to ensure stable frequency - gain, phase characteristics. 5. Low ripple and noise voltages: Ripple and noise voltages are low, both in nos and peak values. The output voltage is finely adjustable from 0 V to the rated voltage with a 10-turn potentiometer The power supply has a current/voltage limit switch to preset a current/voltage value. The set value of constant-voltage/ constant-current operation can be checked when in operation. The power supply has internal protection such as voltage detector* current detector and temperature detector circuits. An overvoltage protector (ÖVP), voltage adjustable from the front panel, also is incorporated as a standard feature. A high speed overvoltage protector (a thyristor crowbar protection circuit) is available as an option. The power supply is boused in a casing for bench top use. It can be installed on a standard EIA (JIS) rack. - The user is requested to read thoroughly. this instruction manua1 before' operating the power supply. · * It is highly recommended to use the thyristor crowbar highspeed overvoltage protector (OVP: option) for a load whose - allowable voltage range is very narrow and which could be damaged when a slight overvoltage is applied.