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NI-DCPower Python API

Project description

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master branch status

Build Status - master branch MIT License Test Coverage - master branch

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Open Issues + Pull Requests Open Pull Requests


Python bindings for NI Modular Instrument drivers. See GitHub for the latest source.




The nidcpower module provides a Python API for NI-DCPower. The code is maintained in the Open Source repository for nimi-python.

Support Policy

nidcpower supports all the Operating Systems supported by NI-DCPower.

It follows Python Software Foundation support policy for different versions of CPython.

NI-DCPower Python API Status

NI-DCPower (nidcpower)

Driver Version Tested Against

2024 Q2

PyPI Version

Latest NI-DCPower Version

Supported Python Version

NI-DCPower supported Python versions


NI-DCPower Python API Documentation Status

Open Issues

Open Issues + Pull Requests for NI-DCPower

Open Pull Requests

Pull Requests for NI-DCPower


As a prerequisite to using the nidcpower module, you must install the NI-DCPower runtime on your system. Visit to download the driver runtime for your devices.

The nimi-python modules (i.e. for NI-DCPower) can be installed with pip:

$ python -m pip install nidcpower~=1.4.8


We welcome contributions! You can clone the project repository, build it, and install it by following these instructions.


The following is a basic example of using the nidcpower module to open a session to a Source Meter Unit and measure voltage and current.

import nidcpower
# Configure the session.

with nidcpower.Session(resource_name='PXI1Slot2/0') as session:
    session.measure_record_length = 20
    session.measure_record_length_is_finite = True
    session.measure_when = nidcpower.MeasureWhen.AUTOMATICALLY_AFTER_SOURCE_COMPLETE
    session.voltage_level = 5.0

    print('Effective measurement rate: {} S/s'.format(session.measure_record_delta_time / 1))

    samples_acquired = 0
    print('Channel           Num  Voltage    Current    In Compliance')
    row_format = '{0:15} {1:3d}    {2:8.6f}   {3:8.6f}   {4}'
    with session.initiate():
        channel_indices = '0-{}'.format(session.channel_count - 1)
        channels = session.get_channel_names(channel_indices)
        for i, channel_name in enumerate(channels):
            samples_acquired = 0
            while samples_acquired < 20:
                measurements = session.channels[channel_name].fetch_multiple(count=session.fetch_backlog)
                samples_acquired += len(measurements)
                for i in range(len(measurements)):
                    print(row_format.format(channel_name, i, measurements[i].voltage, measurements[i].current, measurements[i].in_compliance))

Other usage examples can be found on GitHub.

Support / Feedback

For support specific to the Python API, follow the processs in Bugs / Feature Requests. For support with hardware, the driver runtime or any other questions not specific to the Python API, please visit NI Community Forums.

Bugs / Feature Requests

To report a bug or submit a feature request specific to Python API, please use the GitHub issues page.

Fill in the issue template as completely as possible and we will respond as soon as we can.


Documentation is available here.


nimi-python is licensed under an MIT-style license (see LICENSE). Other incorporated projects may be licensed under different licenses. All licenses allow for non-commercial and commercial use.

gRPC Features

For driver APIs that support it, passing a GrpcSessionOptions instance as a parameter to Session.__init__() is subject to the NI General Purpose EULA (see NILICENSE).

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