CODEWITHSUNDEEP
pythonpyvisaoscilloscope
LeThrill
LeThrill

Reputation: 1

Reading Waveform from Teledyne Lecroy Wavesurfer 3054

I am trying to read the waveform data from a Teledyne LeCroy Wavesurfer 3054 using a pyvisa package I found on GitHub (https://github.com/SengerM/TeledyneLeCroyPy/tree/main). The problem is, when the script calls the get_waveform() method which then calls self.resource.read_raw() the program then halts on that line. I have also tried using pyvisa methods like read_binary_values() but the same problem occurs.

When I restart the oscilloscope then run the code I sometimes get the error: struct.error: unpack_from requires a buffer of at least 4 bytes for unpacking 4 bytes at offset 0 (actual buffer size is 0).

But the vast majority of time the code just get stuck on self.resource.read_raw()

Here is the script I'm running. It is just the first example from the above link.

import TeledyneLeCroyPy

o = TeledyneLeCroyPy.LeCroyWaveRunner('USB0::blah::blah::blah::9.1.0')

print(o.idn) # Pings e.g. LECROY,WAVERUNNER9254M,LCRY4751N40408,9.2.0

print('Waiting for trigger...')
o.wait_for_single_trigger() # Halt the execution until there is a trigger.

data = o.get_waveform(n_channel=1)

print(data['waveforms'])

I cannot for the life of me figure out why if anyone has a solution that would be greatly appreciated.

Upvotes: 0

Views: 67

Answers (1)

Hol Wi
Hol Wi

Reputation: 21

I frequently download oscilloscope curve data using pyvisa. Twice I did run into trouble:

  1. For downloading the curve the oscilloscope must be in the stop state (thats why I always use single shot to aquire the data). In the run state downloading curve data always fails.
  2. Damaged USB port in the oscilloscope. Using the same device over a network cable did function without any issues.

So make shure the oscilloscope is not acquiring new data while doing the download and try using a network cable instead of the USB-Port.

Upvotes: 0

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