[COM] Communication issue with Tektronix 2461 Source meter using USB/TCPIP #495
Description
Hello, I'm trying to run a test script from a raspberry pi for long term testing of power consumption. I've run this script using my windows surface using the NI backend with no issues. Running from the pi I seem to always get an empty list from list_resources() I've used both TCPIP and USB with the same results. I'm pretty new to python and raspberry pi in general, so any help would be greatly appreciated.
Instrument details
- Model: Tektronix 2461 Source Measurement Unit
- Communication: TCPIP & USB
- Link to the documentation (if available): https://www.tek.com/en/datasheet/2461-graphical-source-measure-unit
Output of pyvisa-info
Machine Details:
Platform ID: Linux-6.6.74+rpt-rpi-v8-aarch64-with-glibc2.36
Processor:
Python:
Implementation: CPython
Executable: /usr/bin/python3
Version: 3.11.2
Compiler: GCC 12.2.0
Bits: 64bit
Build: Nov 30 2024 21:22:50 (#main)
Unicode: UCS4
PyVISA Version: 1.11.3
Backends:
ivi:
Version: 1.11.3 (bundled with PyVISA)
Binary library: Not found
py:
Version: 0.5.1
ASRL INSTR: Available via PySerial (3.5)
USB INSTR: Available via PyUSB (1.2.1-2). Backend: libusb1
USB RAW: Available via PyUSB (1.2.1-2). Backend: libusb1
TCPIP INSTR: Available
TCPIP SOCKET: Available
GPIB INSTR:
Please install linux-gpib (Linux) or gpib-ctypes (Windows, Linux) to use this resource type. Note that installing gpib-ctypes will give you access to a broader range of funcionality.
No module named 'gpib'
Here is the output of lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 05e6:2461 Keithley Instruments Source Measure Unit
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
And for reference if it is needed here is the program I am trying to run:
import pyvisa
import sys
import csv
from datetime import *
import time
rm = pyvisa.ResourceManager()
count = 0
#Loop for trying to find connected instrument,set maxcount to desired
#of time. Every ~1000 = ~1 second, recommend 60,000 for about a minute wait.
#Program will stop executing if timeout occurs
max_count = 60000
print("Detecting instrument...")
while not rm.list_resources():
if (count < max_count):
count += 1
else:
print("Timeout, no instrument detected")
sys.exit()
print("Resources detected\n{}\n".format(rm.list_resources()))
resources = rm.list_resources()
smu=rm.open_resource(''+resources[0])
results = open("power_consumption_long.csv","w",)
wr=csv.writer(results, dialect='excel')
wr.writerow(["Date and Time", "Current(mA)","Current Units",'Voltage','Voltage Units'])
results.close()
current_date = date.strftime(datetime.now(),'%Y %m %d %H %M %S')
smu_time = current_date.split(" ")
smu.write(f'SYST:TIME {smu_time[0]}, {smu_time[1]},{smu_time[2]},{smu_time[3]},{smu_time[4]},{smu_time[5]}')
#Set up time for test ::
Example: 'Fri Jan 10 16:00:00 2025'
end_test_requested = 'Tue Mar 18 10:30:00 2025'
end_test = end_test_requested.split()
end_test_time = end_test[3].replace(':','')
current_date_smu = smu.query('SYSTem:TIME? 1')
current_date_split = current_date_smu.split()
current_time = current_date_split[3].replace(':','')
smu.write('ROUTe:TERMinals FRONt')
smu.write(':SOURce:FUNCtion VOLTage')
smu.write(':SOURce:VOLTage 3.7')
smu.write('SOURCe:VOLTage:ILIMit 1')
smu.write(':SENSe:CURRent:NPLCycles 10')
smu.write(':OUTPut:STATe ON')
#Trigger stuff, will continue looping until *TRG is sent to instrument
smu.write('TRIG:LOAD "LOOPUNTILEVENT", COMM, 100')
smu.write(':INIT:IMM')
while float(end_test[2]) >= float(current_date_split[2]) and float(end_test_time) > float(current_time):
test_count = 0
while (test_count < 10):
time.sleep(20)
results = open("power_consumption_long.csv","a",)
wr=csv.writer(results, dialect='excel')
measurement = smu.query\
(':FETC? "defbuffer1", DATE,TIME,FRAC,READ, UNIT, SOUR, SOURUNIT')#,DATE,FORM,FRAC,READ,REL,SEC,SOUR, SOURFORM,SOURSTAT, SOURUNIT, STAT, TIME, TST,UNIT')
measurements=measurement.split(',')
wr.writerow(measurements)
test_count += 1
print(measurement)
else:
results.close()
current_date_smu = smu.query('SYSTem:TIME? 1')
current_date_split = current_date_smu.split()
current_time = current_date_split[3].replace(':','')
time.sleep(10)
else:
smu.write('*TRG')
smu.close()
print("Test is Complete")