Incorrect method in tenma CLI

[pieterjbotma]

Description

The following line in the Tenma 72 PSU CLI tool throws an error:
print("Voltage is", instr.read_voltage(channel), "V")

Affected components

• qmi

Modules to be created

• NA

Modules to be modified

qmi.bin.instruments.qmi_tenma_72psu

Tests to be created/updated

• NA

Documentation to be updated

• NA

Hardware

• Test on Tenma

Acceptance criteria

• Functionality implemented in agreement with description
• Tests are updated and pass
• Code quality metrics ok
• Documentation updated

[heevasti]

The same issue was also present with read_current and please also update about adding the possibility to connect to an existing instrument in another QMI context.