BK Precision 1803 100 MHz Frequency Counter Dynascan 5Hz–100MHz LPF BNC 1MΩ

BK Precision 1803 100 MHz Frequency Counter Dynascan 5Hz–100MHz LPF BNC 1MΩ

The BK Precision 1803 is a benchtop frequency counter covering a range of 5 Hz to 100 MHz, manufactured by BK Precision under their parent company Dynascan Corporation. It features a bright red LED 7-segment display, a single BNC input channel with 1 MΩ input impedance, a 200 V maximum input rating, and a three-position POWER switch offering OFF, ON, and LPF (Low Pass Filter) modes. The LPF mode attenuates high-frequency noise on the input signal, making it useful for cleaner measurements on low-frequency sources.

Specifications & What's Included

• Brand: BK Precision (Dynascan Corporation)
• Model: 1803
• Type: Benchtop Frequency Counter
• Frequency range: 5 Hz to 100 MHz
• Input impedance: 1 MΩ
• Maximum input voltage: 200 V MAX
• Input connector: BNC
• Display: Red LED 7-segment readout
• Power switch modes: OFF / ON / LPF (Low Pass Filter)
• Form factor: Benchtop, compact desktop enclosure
• Case: Tan/beige metal housing
• Included: Unit only — no manual, cables, or accessories

Applications

The BK Precision 1803 is a general-purpose benchtop frequency counter suited for electronics labs, service benches, and educational settings. Frequency counters at this range are used to measure the frequency of oscillators, signal generators, RF circuits, crystal resonators, and audio/RF test setups. The 5 Hz lower limit makes it capable of measuring low-frequency signals down into the audio range, while the 100 MHz upper limit covers standard RF and VHF signals common in amateur radio, communications work, and general electronics testing. The LPF mode is particularly handy when measuring TTL clocks or noisy digital signals where edge-rate issues can cause false triggering. The 1803 dates from the late 1970s to 1980s era of Dynascan/BK Precision benchtop instruments — a period when compact LED-display counters in this frequency class were standard fixtures on electronics workbenches. Units like this remain useful today for any bench requiring a straightforward, no-frills frequency readout.