Tektronix CMC251 1.3 GHz Multifunction Counter
The CMC251 1.3 GHz Multifunction Counter measures the frequency of sine, square and triangle waves from 1 Hz to 1.3 GHz. The CMC251 also provides period, totalize and pulse width measurements. The counter has two input channels. Channel A is a standard 1 megaohm input for frequency measurements up to 100 MHz. Channel B is a 50 Ohm terminated input for use in high-frequency systems. This counter is of interest to radio amateurs because of its ability to measure high-frequency systems. The temperature-compensated, crystal-controlled time base is stable to ±1 part per million per year.
Attenuation - 3 V to 42 V (HI); 50 mV to 5 V (LO)
Low Pass Filter - -3 dB at 100 kHz
Attenuation - 3 V to 42 V (HI); 50 mV to 5 V (LO)
Pulse Width Range - 0.25 µs to 0.5 Second
Selectable Slope - No
Ratio CH A: CH B - No
Display Hold - Yes
Remote Start/Stop - Yes
Time Interval CH A: CH B - No
EMC - Meets Directive 89/336/EEC