BK Precision 1823B Frequency Counter, 0.001 Hz Min, 3GHz Max, 10 digits Resolution

The BK1820B Series Universal Frequency Counters are compact instruments designed for versatile frequency measurements. They’re equipped with a high-quality temperature-compensated internal frequency reference to provide exceptional stability and accuracy, with a low aging rate of ±1 ppm across the entire temperature range.
Featured on the front is a 0.5 in LCD for displaying frequency, period, ratio, pulse width, or event count measurements. Multiple input channels allow for precise measurements across a broad range of frequencies. Input A offers flexible signal conditioning, with configurable coupling (AC or DC), input impedance (1 MΩ or 50 Ω), attenuation (1:1 or 5:1), threshold (fully variable) and active edge. With the BK1826B, an additional input C offers an N-type connector with 50 Ω input impedance and frequency range of 3 GHz to 6 GHz.

3 GHz (BK1823B) and 6 GHz (BK1826B) models
Dedicated microwave channel with N-type connector (BK1826B only)
10-digit display resolution with 0.5 in LCD
±1 ppm time base stability
Internal rechargeable batteries allow for up 24 hours of operating life
Frequency ratio measurement function
Time interval measurement
Remote control with USB (VCOM) interface
Selectable measurement time, 100 s, 10 s, 1 s, and 0.3 s