Features 1、FREQUENCY RANGE: This is a phase frequency analyzer that can measure the frequency and phase difference between signal applied to two inputs very accurately. The input frequency can be any frequency between 1MHz and 290MHz 2、TYPICAL USE: Measure the difference between two 10MHz clocks. The phase meter can display the phase and frequency difference digitally, display the relationship between the measurement results and time with a graph, store the measurement results on the memory card inserted into the memory card slot, or send the phase measurement results to the PC via USB, and run programs such as for Time Lab for further display and processing. Phase and frequency measurement accuracy better than 1e‑12 per second 3、FREQUENCY DIFFERENCE: The maximum frequency difference that a phase frequency analyser can display depends on the measurement time (τ), which is about 200Hz/s, so for τ 1s, the maximum frequency difference is 200Hz 4、SUPPORTED HARDWARE: Phase frequency analyser is based on for VNA‑H4 hardware, run custom software to measure small deviations between two signal with similar frequencies. If you already own for VNA‑H 4 and do not need to use for long term measurement, you can use for VNA‑H 4 after brushing into for tiny PFA firmware without having to buy again 5、APPLICABLE SITUATION: Phase analyser is not a frequency meter, the internal reference is inaccurate and unstable, can be used to compare a signal with a very accurate reference signal 6、USB POWERED: The phase frequency analyzer is a portable battery powered device that charged by a USB port and has a 4in display that is very easy to carry and operate Specification Item Type: Phase Frequency Analyzer Material: ABS Frequency: 1MHz-290MHz Accuracy: <1E-12/sec Screen Size: 4in touch screen Storage: Micro memory card 32GB Power Supply: Built in 3.7V 2000mAh lithium battery Package List 1 x Host(including 32GB micro memory card) 2 x SMA Male to Male ALSR100 Cables 1 x Micro Memory Card Reader 1 x USB Type C Data Cable 1 x Touch Pen 1 x Lanyard