Skip to content

levylab.lockin

LabVIEW class: Instrument.Lockin.lvclass (auto-connected by CESession)

flex_drivers.levylab.lockin.Lockin

Bases: ZMQInstrument

Multichannel lock-in amplifier (LevyLab Instrument Framework app).

get_ao(channel)

Read the analog output configuration of channel.

get_ai(channel)

Read the analog input of channel.

set_ao_function(channel, value)

Set the AO waveform: Sine, Triangle, or Square.

set_sampling_mode(value)

Set the sampling mode (IF method setSamplingFsMode).

set_sweep(sweep_config)

Configure a sweep.

sweep_config format::

sweep_config = {"Sweep Time (s)": sweep_time,
                "Initial Wait (s)": 2,
                "Return to Start": False,
                "Channels": [{"Enable?": True,
                              "Channel": channel,
                              "Start": start,
                              "End": stop,
                              "Pattern": "Ramp /",
                              "Table": []},
                             ]}

set_ao(channel, value)

Canonical DAQ capability alias: set the DC value of an AO channel.

get_lockin_result(channel, param, ref=1)

Extract one value (e.g. X, Theta, Mean) from getResults.

lockin_sweep(sweep_config, timeout=10)

Run a sweep and block until it finishes.

set_backgate(bg_channel, bg_target, sweep_rate, initial_wait=1, tol=0.001)

Sweep the backgate voltage to a target value.

Parameters:

Name Type Description Default
bg_channel int

Analog output channel used for the backgate.

 required
bg_target float

Target backgate voltage in volts (V).

 required
sweep_rate float

Sweep rate in seconds per volt (s/V).

 required
initial_wait float

Delay before starting the sweep in seconds. Default 1 s.

 1
tol float

Voltage tolerance in volts used to determine whether the gate is already at the target voltage. Default 1e-3 V.

 0.001