Keysight 53181A RF Frequency Counter, 10 digits/s, 225 MHz Input Channel

• 225 MHz RF Counter (10 digits/s), 1 channel with optional 2nd microwave channel
• Measures frequency, frequency ratio (with opt. 015), period, peak voltage

Keysight 53181A frequency counter was originally introduced in 1993. The recommended replacement is Keysight 53210A.