What is a common usage of Keithley cards in a cellular telephone production test environment?

What is a common usage of Keithley cards in a cellular telephone production test environment?

• 7011 - Audio switching
• 7013 - Power switching
• 7016 - RF switching
• 7020 - Digital monitoring and control
  
  Other cards that are commonly used in telecommunications applications include:
  
  
• 7022 - Combines 5x6 matrix and digital I/O on one card
• 7035 - Four-wire switching for T1/E1 applications
• 7037 - Combines 30 independent one pole switches and digital I/O on one card
• 7038 - 75 Ohm characteristic impedance for cable and internet applications