DAC

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Syntax

lager dac [OPTIONS] NET [VOLTAGE]

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Global Options

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Arguments

• NET - Name of the DAC Net to control
• VOLTAGE - Voltage value in volts to output

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Supported Hardware

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LabJack U3

• The output range is 0.04 V to 4.95 V, not 0 V to 5 V. The box refuses a value outside that range and does not clamp it. You cannot set a U3 DAC to 0 V.
• A U3 has no DAC readback. lager dac NET without a voltage returns the last value that the box set on that net.
• If the box has no value to report, the read fails with a has no readback error. This happens, for example, after a lager python script ran. Set a value first.

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Channel Naming

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Read the Output

lager dac VOLTAGE_OUTPUT --box my-lager-box

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Default Net

lager defaults add --dac-net VOLTAGE_OUTPUT

lager dac 3.3

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Examples

# Set DAC output to 3.3V
lager dac VOLTAGE_OUTPUT 3.3 --box my-lager-box

# Set DAC output to 5.0V
lager dac POWER_RAIL 5.0 --box my-lager-box

# Set DAC output to 1.8V
lager dac REFERENCE_VOLTAGE 1.8 --box my-lager-box

# Set DAC output to 0V
lager dac SIGNAL_GENERATOR 0.0 --box my-lager-box

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Troubleshooting

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Notes

• Net names (e.g., VOLTAGE_OUTPUT, POWER_RAIL) refer to names assigned when setting up your testbed
• Voltage values are specified in volts
• Only works with nets of type dac
• Ensure the target box has DAC nets properly configured
• DAC outputs provide precise voltage control for analog circuits
• LabJack T7 and USB-202 output 0-5V. LabJack U3 outputs 0.04-4.95V.

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See Also

• ADC — Analog-to-digital converter input (the complement of DAC)
• Python DAC API — Set DAC output in Python scripts