Range Considerations
It is not possible to change the measurement range for the NI PXI-4130 independently of the output range. The measurement range is implicitly selected based on the configured output range. The selected measurement range is large enough to measure any voltage or current possible in the configured output range.
The voltage output can be set to any value between 0% and 100% of the active range using the niDCPower Configure Voltage Level VI or the niDCPower_ConfigureVoltageLevel function, or the niDCPower Configure Voltage Limit VI or the niDCPower_ConfigureVoltageLimit function. Current output can be set to any value between 2% and 100% of the active range using the niDCPower Configure Current Level VI or the niDCPower_ConfigureCurrentLevel function, or the niDCPower Configure Current Limit VI or the niDCPower_ConfigureCurrentLimit function. Measurements for both voltage and current can be made from 0% to 105% of the active range using the niDCPower Measure Multiple VI or the niDCPower_MeasureMultiple function. Refer to Overranging for general information about enabling overranging in software.
Overranging
Enabling overranging for a particular channel of the NI PXI-4130 extends current and voltage output capabilities up to 105% and current setpoints down to 1% for the output range (without overranging, valid output values are between 2% and 100% of the current output range). Measurements in any given range may be made up to 105% of the range by default without enabling overranging.
An auxiliary power supply providing at least 12 V at the input terminals should be used when enabling overranging for channel 1. Refer to Ranges for more information about enabling or disabling overranging for a particular channel.
Considerations When Making Range Changes
Using delayed configuration mode, changes in voltage and current levels occur simultaneously when the device is initiated. These changes do not occur at the same time if there is a current range change involved. If the current range, current limit, and voltage level are all changed within the same delayed configuration, the current range and current limit change occur first immediately followed by the voltage level change.
Disabled State
When channel 1 is disabled, it is actively maintaining 0 V with a current limit of 20 mA. If a device capable of sourcing power is connected to channel 1 while the channel is disabled, the channel begins to sink power with a current limit of 20 mA.
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Note All channels on the NI PXI-4130 power on in the disabled state. |