An optional third channel is available for use with the HP 35677A/B s-parameter test set or for measuring two devices simultaneously. When used with the HP 35677A/B, the HP 3577B can measure all four s-parameters and any of the parameters listed above without having to manually alter the test configuration. The HP 35677A is used for 50 ohm systems and the HP 35677B is used for 75 ohm systems.
When equipped with optional HP Instrument BASIC, the HP 3577B can execute user-written programs designed to automate measurement systems, compute parameters (such as pass band ripple and 3 dB bandwidth) or customize the user-interface. This includes system control of other HP-IB instruments and peripherals, such as plotters and printers, via the HP-IB. A programmable I/O port, located on the rear panel, extends HP Instrument BASIC control to non-HP-IB devices, such as device handlers, environmental chambers, and even the device-under-test itself.
Of course, the HP 3577B is fully programmable, either internally with HP Instrument BASIC, or externally via the Hewlett-Packard Interface Bus (HP-IB).
An optional high-stability frequency reference oven is available for those users not having an in-house frequency standard.