53131A Agilent Technologies - Counters and Frequency Meters

The 53131A universal counter has the capability to do the job quickly and correctly from fast signal processing to automated limit tests. The 53131A has frequency resolution of 10 digits per second, 500 ps time interval resolution and a complete set of test and analysis features. The unit comes with two 225 MHz channels, and you can choose an optional third channel that measures up to 3 GHz.

• Two-channel frequency and time interval measurements up to 225 MHz
• Time-interval resolution of 500 ps
• Frequency resolution of 10 digits per second
• Single-key setup recall
• High measurement throughput
• Standard HP-IB and talk-only RS-232

For more details consult datasheet here