Triggered Voltage Level

General Information - 2

(VOLT:RANG command). When you program a voltage value, the electronic load automatically selects the range that corresponds to the value that you program. If the value falls in a region where ranges overlap, the electronic load selects the Low range. If the present input setting is outside the Low range, the electronic load will automatically adjust the input setting to the highest value available in the Low range. If you subsequently program an input value that is outside the Low range, an OUT OF RANGE message will appear on the front panel display.

Figure 2-3. Constant Voltage Mode

Immediate Voltage Level

The voltage level can be set at the front panel or via the GPIB (VOLT command). If the CV mode is active, the new setting immediately changes the input at a rate determined by the voltage slew setting. If the module is not in the CV mode, the new setting is saved for use when the mode is changed to CV.

The voltage level can be preset (stored in the electronic load) allowing the input to be updated when a trigger is received instead of immediately as described above.

If the CV mode is the active mode, the preset current level will become the actual value and the input will be updated when a trigger occurs. If the CV mode is not the active mode, the preset current level will become the actual value when a trigger occurs, but there will be no effect on the input until the CV mode becomes active. Once a level is triggered, subsequent triggers will have no effect on the input unless another VOLT:TRIG command is sent.

Transient Voltage Level

The transient voltage level can be set at the front panel or via the GPIB (VOLT:TLEV command). The module input will switch between the main level and the transient level when transient operation is turned on. The transient voltage level determines the higher voltage level.

Slew Rate

The voltage slew rate determines the rate at which the input voltage to a module changes to a new programmed value. Voltage slew rates are programmed in volts per second. Slew rates can be set at the front panel or via the GPIB (VOLT:SLEW command). The programmed slew rate remains in effect for the immediate, triggered, and transient level changes previously described.

Any slew rate can be programmed provided that it falls between the fastest and the slowest slew rates shown in Figure 2-8B. If a value is programmed that is outside these limits, the module will automatically adjust the programmed value to either the fastest or the slowest slew rates shown in the figure.