A multi-channel scaler designed for the experiment of the reaction microscope at Lanzhou

This article introduces a high resolution and multi-channel scaler based on PXI-3U standard. The maximum repetition frequency of the input signal is 100 MHz, with a counting scale up to 2⁴⁰. This scaler is able to operate in two working modes: counting within a certain time period or between two adjacent input trigger signals. The first mode is designed for a low counting rate (∼1 MHz), while the second mode for a high rate (∼100 MHz). Test results indicate that this scaler has a good performance, beyond the application requirement in the experiment of the reaction microscope at Lanzhou (ReMiLa). Besides, with the application of Field Programmable Gate Array (FPGA), this scaler module is flexible and convenient to be upgrade in future. (authors)