BK Precision 1805 80 MHz 8-Digit Frequency Counter Dynascan Period Total

BK Precision 1805 80 MHz 8-Digit Frequency Counter Dynascan Period Total

The BK Precision 1805 is an 80 MHz benchtop frequency counter manufactured by Dynascan Corporation, the Chicago-based company behind the BK Precision instrument line. It features an 8-digit LED display and measures three quantities: frequency, period, and totalize (event counting). A front-panel BNC input accepts signals from 5 Hz to 80 MHz with 1 MΩ input impedance and a maximum input of 200V Pk. Selectable resolution, an attenuator, a low-frequency filter, and a hold function round out the front-panel controls.

Specifications & What's Included

• Model: BK Precision 1805 (Dynascan Corporation, Chicago, IL)
• Frequency range: 5 Hz – 80 MHz
• Display: 8-digit LED with MHz, kHz, and µSEC indicators
• Measurement modes: Frequency, Period, Totalize
• Input connector: BNC (front panel)
• Input impedance: 1 MΩ
• Maximum input voltage: 200V Pk Max
• Resolution settings (Frequency): 100, 10, 1, 0.1 Hz
• Resolution settings (Period): 1K, 100, 10, 1, 0.1 µSEC; 0.001, 0.0001 µSEC
• Controls: Power, Frequency, Period, Total, Resolution matrix, Reset, Hold, Filter, Atten., X1/X10 attenuator
• Power: 108–132V AC, 60 Hz, 10 Watts
• Form factor: Benchtop with tilt bail
• Power cord attached

Applications

The BK Precision 1805 is a general-purpose benchtop frequency counter suited for electronics labs, service benches, and hobbyist use. Frequency counters like this measure the number of cycles per second of a periodic signal, making them essential for characterizing oscillators, crystals, RF circuits, and signal generators. The period mode is useful when working with lower-frequency signals where period measurement is more intuitive, and the totalize mode counts discrete events or pulses. The 1805 dates from the late 1970s to early 1980s — the era when Dynascan was a major producer of affordable bench instruments under the BK Precision brand, aimed at technicians, educators, and small electronics shops who needed dependable test equipment at a practical price point. Units like this remain useful today for general bench characterization, educational settings, and vintage electronics repair where 80 MHz coverage is more than adequate.