Tekelec DC504 Counter/Timer Plug-In The Tektronix DC504 is a used Counter/Timer Plug-In. The Tektronix DC504 Counter/Timer Plug-In is for use in any of the TM-500 series Power Modules. Measures frequency from 0.1 Hz to 80 MHz; period, from 1 µS to 999.99 Sec and totalizes events from 0 to 99,999 at a maximum rate of at least 80 MHz. Sensitivity 20 mV below 15 MHz, 35 mV below 50 MHz and 495 mV p-p at 80 MHz. 5-digit LED display with front-panel overflow indicator.
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