The NNJ TPLLV1/A is a compact, USB-powered Tight Phase-Lock Loop (TPLL) instrument designed for precision frequency metrology. It enables high-resolution characterization and disciplining of OCXOs and higher-grade references, while providing a clean buffered control output for loop closure.

• Tight Phase-Lock Loop (TPLL) implementation optimized for frequency metrology
• High-resolution 24-bit ADC for direct digitization of control and error signals
• Optimized for 10 MHz references; usable from ~1 MHz to 100 MHz
• Accepts both sine and square wave inputs
• Buffered EFC output for direct oscillator control and loop closure (±3.5 V max)
• USB powered
• Dedicated low-noise LDO regulators and fully separated analog/digital power domains, ensuring clean and stable operation
• Compatible with John Miles’s TimeLab for direct measurement

• NNJ TPLLV1/A instrument
• Dedicated case
• No cables are included

Each unit is individually assembled, calibrated, and tested in our laboratory prior to shipment.

The TPLLV1/A is covered by a 1-year limited warranty against hardware defects. Lifetime free technical support is included. In case of warranty issues, shipping costs to and from our facility/warehouse are the responsibility of the customer.

*please check our policies while ordering. We cannot ship to some countries.