SR830 connection error - "AttributeError: module 'visa' has no attribute 'ResourceManager'"

[juggernaut545]

Hello. I am new to Pyvisa, NI Visa, and related software so please bear with my lack of technical knowledge.

I have an SR830 Lock-In Amplifier which I am attempting to connect to my computer so that I can read and write data to and from it. I connected the computer with the instrument by using a KUSB-488B wire, with the GPIB side attached to the instrument and the USB attached to the computer.

Below is the code that I am using and the name of the file that the error references.

import pyvisa
from labdrivers.srs import Sr830

sr830_gpib_address = 8

lock_in = Sr830(sr830_gpib_address)

Even after changing the "visa" to "pyvisa" in the specific file that it is referencing, I am still getting the same error.

I appreciate all and any help.
Thank you.

[hinnefe2]

Hi - I'm glad to see this package is still getting some use!

I think the issue here is that the ResourceManager class is now located at pyvisa.highlevel.ResourceManager : https://pyvisa.readthedocs.io/en/1.12.0/api/resourcemanager.html#pyvisa.highlevel.ResourceManager.

Hopefully if you change this line:

labdrivers/labdrivers/srs/sr830.py

Line 21 in 9e79b0b

self.resource_manager = visa.ResourceManager()

to

self.resource_manager = visa.highlevel.ResourceManager() 

things will work. It's possible / likely that other changes in the visa library might need to be accounted for too though. If that change does make things work a PR would be great if you have the time! I don't have access to any of these instruments anymore so I can't really continue development of this package myself.

An alternative option is to try installing a version of the visa library from around the same time as this labdrivers package was developed. Based on the date of the last commit to sr830.py and the release history it looks like that might be 1.9.1.

[bilderbuchi]

In case you don't get anywhere with these modifications, you could try with the SR830 implementation in pymeasure (I'm a maintainer) or the one from instrumentkit.

[juggernaut545]

Thank you all for the help, and I apologize for the delay in my response. I was able to get it to work by reinstalling pyvisa and rewriting the line to self.resource_manager = visa.highlevel.ResourceManager() as Hinnefeld suggested. I appreciate your time and help.

[hinnefe2]

Glad you got it working! If you'd like to put up a pull request with the fix I'll get it merged but no worries if not.