Tektronix 5B40

60 MHz Time Base Plug-In
The Tektronix 5B40 is one of our refurbished 60 MHz, Time Base Plug-Ins.

Tektronix 5B40 Features:

Sweep rate: 10ns to 5s/div
The Tektronix 5B40 is a 60 MHz timebase for 5000-series scopes, particularly the 5400-series. The trigger signal passes through source switching, coupling switching, and then a JFET source-follower buffer. Next, the signal is buffered by a PNP emitter-follower biased at around 5mA collector current. That provides a known (low) source impedance for driving the switch-selectable LF reject and HF reject filters. The output of the filters drives a discrete NPN differential amplifier, which drives U165, a 155-0109-01 Tek-made trigger IC.