Instrument Description The TEKTRONIX DC 510 is a universal counter/timer plug-in. It features reciprocal Frequency, Period, Ratio, and Events B During A measurements to 350 MHz. For timing measurements, the Time Interval, Width, Risetime and Falltime functions feature 3.125 nsec single-shot resolution. For these measurements, averaging and identical A and B channels provide increased accuracy. Also included is a time manual mode, as well as three 350 MHz Totalize modes (A, A+B, and A-B). The DC 510 also has an auto-trigger feature, a probe-compensation feature, an auto averages function, and an extensive set of automatic power-up self tests. The DC 510 has a DVM mode that reads out the channel A and channel B trigger level voltages. Shaped outputs and an arming input are available at the front panel. Also available at the front panel is a signal for use with the probe compensation function. The DC 510 can be equipped with an optional, oven-controlled, 10 MHz crystal oscillator to obtain an even more stable and precise internal time base. A GPIB conversion kit (Field Modification Kit 040-1023-00) for the DC 510 is available from Tektronix, Inc.