Tektronix

Today Tektronix manufactures many different pieces of equipment but is not really present in the Optical Test Equipment space. Tektronix, just like Fluke and Keithley is now a subsidiary of Fortive.

Tektronix offers a wide range of products for testing and measurement. Here are some of their key products:
•Oscilloscopes and Probes: These are used to observe the change of an electrical signal over time.
•Analyzers: This includes spectrum analyzers, logic analyzers, and protocol analyzers.
•Bit Error Rate Tester: This is used to test the quality of signal transmission of single components or complete systems.
•Signal Generators: These are used for designing, testing, troubleshooting, and repairing electronic devices.
•Software Applications: These are used for controlling and analyzing results from their hardware products.
•Digital Multimeters: These are used to measure voltage, current, and resistance.
•Semiconductor Test Systems: These are used for testing the electrical behavior of semiconductor devices.
•Electrochemistry Products: These are used in a variety of research and industrial applications.
•Power Supplies: These are used to provide electrical power to an electrical load.
•Source Measure Units: These are used to precisely source voltage or current and simultaneously measure voltage and/or current.

Please note that this is not an exhaustive list and Tektronix offers many other specialized products as well.