DAC

Set analog voltage outputs using DAC pins. Supports LabJack T7, LabJack U3 and MCC USB-202 hardware.

Import

from lager import Net, NetType

Methods

Method	Description
`output(voltage)`	Set analog output voltage
`get_voltage()`	Read configured output voltage
`input()`	Alias for `get_voltage()`

Method Reference

`Net.get(name, type=NetType.DAC)`

Get a DAC net by name.

from lager import Net, NetType

dac = Net.get('VREF', type=NetType.DAC)

Parameters:

Parameter	Type	Description
`name`	`str`	Name of the DAC net
`type`	`NetType`	Must be `NetType.DAC`

Returns: DAC Net instance

`output(voltage)`

Set the analog output voltage.

dac.output(2.5)  # Set to 2.5V

Parameter	Type	Description
`voltage`	`float`	Output voltage in volts. LabJack T7 and USB-202: 0-5 V. LabJack U3: 0.04-4.95 V

Raises: ValueError if the voltage is outside the range of the instrument. A LabJack U3 refuses a value outside 0.04-4.95 V, so you cannot set it to 0 V.

`get_voltage()`

Read the currently configured output voltage.

v = dac.get_voltage()
print(f"DAC set to: {v}V")

Returns: float - Configured voltage in volts A LabJack U3 has no DAC readback. On a U3, get_voltage() returns the last value that this net object set. If it set no value, the call raises an error with the text has no readback. The MCC USB-202 has no readback, so the call raises NotImplementedError.

`input()`

Alias for get_voltage(). Returns the currently configured output voltage.

v = dac.input()
print(f"DAC output: {v}V")

Returns: float - Configured voltage in volts

Examples

Set Reference Voltage

from lager import Net, NetType

vref = Net.get('VREF', type=NetType.DAC)
vref.output(1.8)  # Set to 1.8V

Generate Ramp Signal

from lager import Net, NetType
import time

signal = Net.get('SIGNAL_OUT', type=NetType.DAC)

# Ramp from 0 to 5V in 0.5V steps
for v in range(0, 51, 5):
    voltage = v / 10.0
    signal.output(voltage)
    print(f"Output: {voltage}V")
    time.sleep(0.1)

Voltage Sweep Test

from lager import Net, NetType
import time

control = Net.get('CONTROL', type=NetType.DAC)
sensor = Net.get('RESPONSE', type=NetType.ADC)

# Sweep control voltage and measure response
for mv in range(0, 3301, 100):
    voltage = mv / 1000.0
    control.output(voltage)
    time.sleep(0.1)  # Settling time

    response = sensor.input()
    print(f"Control: {voltage:.2f}V, Response: {response:.3f}V")

Set and Verify

from lager import Net, NetType

dac = Net.get('ANALOG_OUT', type=NetType.DAC)

# Set output
dac.output(3.3)

# Read back to verify
readback = dac.get_voltage()
print(f"Set: 3.3V, Readback: {readback}V")

Supported Hardware

Hardware	Channels	Range
LabJack T7	DAC0-DAC1	0-5 V
LabJack U3	DAC0-DAC1	0.04-4.95 V
MCC USB-202	AOUT0-AOUT1	0-5 V

The examples above output 0 V and 5 V. On a LabJack U3, keep every value from 0.04 V to 4.95 V.

Pin Naming

LabJack T7:

Pin Input	Channel
`0`-`1`	DAC0-DAC1
`"DAC0"`-`"DAC1"`	DAC0-DAC1

MCC USB-202:

Pin Input	Channel
`0`-`1`	AOUT0-AOUT1
`"DAC0"`-`"DAC1"`	AOUT0-AOUT1
`"AOUT0"`-`"AOUT1"`	AOUT0-AOUT1

Notes

DAC nets work directly without enable()/disable() calls
LabJack T7 output range: 0-5 V
LabJack U3 output range: 0.04-4.95 V
USB-202 output range: 0-5 V
input() is an alias for get_voltage() and returns the configured output value
A LabJack U3 and a USB-202 give no hardware readback
Output values are maintained until changed or power cycle
Net names must match those configured on the Lager Box

Getting Started

Development

Power & Simulation

Measurement

I/O & Communication

Utilities

Import

Methods

Method Reference

`Net.get(name, type=NetType.DAC)`

`output(voltage)`

`get_voltage()`

`input()`

Examples

Set Reference Voltage

Generate Ramp Signal

Voltage Sweep Test

Set and Verify

Supported Hardware

Pin Naming

Notes

​Import

​Methods

​Method Reference

​Net.get(name, type=NetType.DAC)

​output(voltage)

​get_voltage()

​input()

​Examples

​Set Reference Voltage

​Generate Ramp Signal

​Voltage Sweep Test

​Set and Verify

​Supported Hardware

​Pin Naming

​Notes

Import

Methods

Method Reference

`Net.get(name, type=NetType.DAC)`

`output(voltage)`

`get_voltage()`

`input()`

Examples

Set Reference Voltage

Generate Ramp Signal

Voltage Sweep Test

Set and Verify

Supported Hardware

Pin Naming

Notes