· Counts to 550 MHzwith /10 Prescale (50 Ohm Input).

· Direct Counting to110 MHz

· 7 Digit LEDDisplay

· Manual Start/Stop(Totalize)

The DC 502 Digital COunter measures frequencies from 10 Hz to 55MHz or totalizes events up to the readout capacity of 10x7-1 at themax rate of 550 MHz. Frequency measurements are accomplished usingon of two inputs. The DIRECT INPUT has a frequency range of 10 Hzto 110 MHz, a 1 megohm input impedance, 300 mV p-p sensitivity (100mV rms sine wave) and an adjustable trigger level range. The /10PRESCALE INPUT has a frequency range from 50 MHz to 550 MHz with a500 mV p-p sensitivity (170 mV rms sine wave) and a 50 Ohm inputimpedance. The manual totalizing mode with front panel start stopcontrol is available in both inputs; from the prescale input, 1displayed count per 10 input events will result. Measurementdisplay is accomplished with 7 segment LEDs in a seven digitreadout. The decimal point is automatically positioned by themeasurement interval seleted, and leading zeros ( those to the leftof the most sig digit or those to the left of the decimal point)are blanked. LEDs indicate when the gate is armed, and whetherdisplayed numbers are in kHz or MHz, and when register overflowoccurs. Four gate times of 0.01 s, 1.0 s, and 10 S are provided. Astandard internal 1 MHz clock is provided with 1x10-5accuracy.