Tektronix DC503A

Universal Counter / Timer
The Tektronix DC503A is a used Universal Counter / Timer.

Two input channels: A and B
Each with 125MHz capability
Each channel has separate:
Triggering level
Triggering slope
Attenuator
Coupling mode controls
Eight measurement functions are available and an averaging feature allows averaging of 1 to 10 occurrences of the signal of interest
Signals to be counted or timed can be applied to channels A and B via front-panel BNC connectors or through rear-interface connections
An easy-access front panel and an LSI-based design for increased instrument reliability.
Equipped with a temperature-controlled 10MHz crystal oscillator to obtain a highly stable and precise internal time base