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Tektronix DC 505A Universal counter/timer. 225MHz dual channel counter. DC Output for Accurate Trigger Level, Setting with Companion DMM, 10 Nanosecond Clock Rate, Time Interval Averaging with Resolution to 100 Picoseconds, Two Equal Bandwidth Channels for Time, Events A During B.
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The DC505A Frequency Counter Plug-In is designed to operate in a TM 500-Series Power Module. Has seven measurement functions: frequency counting, finding frequency ratios, period timing, interval timing, width timing, electronic event counting, and manual event counting. Two input channels (A&B), each have BNC inputs and separate triggering levels, attenuators, and coupling mode controls, and 225 MHz capability. Provides 7-digit LED display.