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Some general operating information is included in this chapter to help you understand how the power supply operates under various load conditions. This information applies whether you are operating the supply via the front panel or the GP-IB. Output Ranges Figure 4-1 identifies the output combinations that are available on the power supply. Each output can operate as a constant voltage (CV) or constant current (CC) source over a wide variety of output voltage and current combinations. In addition, each output has an active downprogrammer which operates at currents up to approximately 110% of the maximum positive current rating of the output. This means that each output can actively sink as well as source its maximum rated output current. At voltages below 2.5 V, a downprogramming resistor continues downprogramming until the voltage reaches approximately zero volts. Figure 4-1. Output Combinations Output Connections and Operating Information 45 Operating Quadrants Figures 4-2A and 4-2B show the operating locus of your power supply in three quadrants. The area in quadrant 1 shows the operating locus defined by the voltage and current settings of each output. The area in quadrant 2 indicates the locus where each output can operate as a current sink. You cannot program current limit values in quadrant 2. Figure 4-2. Typical Output Range Characteristics 46 Output Connections and Operating Information Figure 4-3 shows the current sink characteristics lower voltages in greater detail. The area in quadrant 4 illustrates the reverse polarity diode characteristics of each output. Do not operate any output with reverse-voltage currents that are greater than the maximum rating of the output. Figure 4-3. Typical Downprogramming Characteristic Below 2.0 V Operating Ranges Notice in Figure 4-2, there are four overlapping areas in quadrant one for both the 25 watt and 50 watt outputs. The Low Range Voltage and Low Range Current ranges are higher precision than the High Range Voltage and High Range Current ranges. The voltage and current ranges can be set independently (see page 73). If the high resolution range is programmed, attempting to program values outside this range will result in a number range error. The 50 watt output (Figure 4-2B) is different from the 25 watt output (Figure 4-2A), in that there is a power limiting boundary at 1 amp in the High Voltage/High Current range. As a result, the 50 watt output can be set to no more than 1.03 amps at voltage settings above 16.16 volts, and vice versa. Setting parameters of voltage or current beyond this power limit boundary, but within the High Voltage/High Current range will cause the other parameter (voltage or current) to automatically be scaled down to the power limiting boundary (see pages 71 and 73). The voltage and current programming resolution of the outputs is affected by the setting of the range. The voltage of the 25 watt output, when programmed to the Low Voltage Range, has a voltage programming resolution of 460 mV. When programmed above 7 volts, the High Voltage Range must be selected resulting in a programming resolution of 3.2 mV. The current of the 25 watt output, when programmed to the High Current Range, has a current programming resolution of 1 mA. When programming above 15 mA, the High Current Range must be selected, resulting in a programming resolution of 33 mA. The voltage of the 50 watt output, when programmed to the High Voltage Range, has a voltage programming resolution of 1 mV. When programming above 16.16 volts, the high range must be selected, resulting in a programming resolution of 3.2 mV. The current of the 50 watt output, when programmed to the High Current Range, has a current programming resolution of 13 mA. When programmed above 200 mA, the High Current Range must be selected, resulting in a programming resolution of 131 mA. The readback range of the outputs is not programmable, and is selected automatically by the power supply. Output Connections and Operating Information 47 The readback resolution of the 25 watt outputs when metering voltages of 7 volts or below, will be 483 mV. For voltages above 7 volts, the readback resolution will be 3.3 mV. The readback resolution of the 25 watt outputs when metering source currents of 15 mA or below, the readback resolution will be 1 mA. When metering source currents above 15 mA, the readback resolution will be 48 mA. When metering sink currents of 15 mA or below, the readback resolution of the 25 watt outputs will be 1 mA. When metering sink currents above 15 mA, the readback resolution will be 37 mA. When metering voltages of 16 volts, or below, the readback resolution of the 50 watt outputs will be 1.1 mV. For voltages above 16 volts. the readback resolution will be 3.3 mV. When metering source currents of 200 mA or below, the readback resolution of the 50 watt outputs will be 14 mA. When metering source currents above 200 mA, the readback resolution will be 160 mA. When metering sink cu...

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