HP 5340A Frequency Counter
The HP 5340A Frequency Counter operates from 10 Hz to 18 GHz. Sensitivity specifications are as follow: -30 dBm from 10 Hz to 500 MHz -35 dBm from 500 MHz to 16 GHz -25 dBm from 10 to 18 GHz Input impedance is 50 ohm.
HP 5335 Universal Counter
The HP 5535 Universal Counter operates from DC to 100MHz. This universal system counter has a range of 0 - 200 Mhz. on Channel A and 0MHz-100MHz on channel B. The single shot time interval is better than 2ns, 100ps with averaging. There is are built in automatic rise time, duty cycle, pulse width, slew rate and phase measurements. Advanced triggering, HPIB, math and statistics are standard.