The readback resolution of the 25 watt outputs when metering voltages of 7 volts or below, will be 483 μV. 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 μA. When metering source currents above 15 mA, the readback resolution will be 48 μA.
When metering sink currents of 15 mA or below, the readback resolution of the 25 watt outputs will be 1 μA. When metering sink currents above 15 mA, the readback resolution will be 37 μA.
When metering voltages of 16 volts, or below, the readback resolution of the 50 watt outputs will be 1.1 μV. 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 μA. When metering source currents above 200 mA, the readback resolution will be 160 μA.
When metering sink currents of 200 mA or below, the readback resolution of the 50 watt outputs will be 14 μA. When metering sink currents above 200 mA, the readback resolution will be 151 μA.
Protection Features
Protective circuitry within the supply can limit or turn off an output in the event of an abnormal condition. The activated protection feature can be determined by observing the front panel display area. You can also read back the status of the supply over the
OVERVOLTAGE
1.The output voltage exceeds the programmed overvoltage trip point. or
2.The sum of the voltage from the + V output terminal to the +S terminal plus the voltage from the
or
3. A trip signal is received on the output’s OV terminals.
or
4. The output’s fixed overvoltage circuit is activated.
The OV trip point can be programmed up to 55 V. When an overvoltage occurs, the word OVERVOLTAGE appears in the front panel display and the OV status bit is set for that output. Chapter 5 explains how to program the overvoltage trip level.
A fixed overvoltage threshold of approximately 120% of the maximum rated output voltage is built into each output. Because the fixed overvoltage circuit is biased from the output terminals, it can be activated and provide protection even when the supply is not connected to the ac power line.
The OVRST command or front panel RESET key restores the programmed voltage and current values and clears the OV once the cause of the overvoltage has been eliminated.
OVERCURRENT
CCoperating mode, the output will be disabled (set to zero volts and minimal current) and the word OVERCURRENT will appear on the front panel display. In addition, the OC status bit is set for that output. The OCRST command or front panel RESET key restores the programmed voltage and current values and clears the OC once the cause of the overcurrent condition has been eliminated. Refer to Chapter 5 for programming details.
