Quad-Channel Digital Pico ammeter

Project information

The P4CH–LNLS is a standalone, high-resolution, four-channel picoammeter. The channels are independent; each features an eight-range transimpedance amplifier (I-V amplifier) and 24-bit resolution, delta-sigma ADC with ten selectable sampling frequencies that reach up to 2000 samples per second. The hardware’s input stage was designed to be biased up to 400 V by an external high-voltage power supply. Edge-sensitive trigger signals allow for synchronization of data acquisition with external events or other devices. Input and output ADC clock connectors are also available on the device, which may be beneficial for applications requiring multiple and synchronized P4CH-LNLS with strict timing requirements. NXP Semiconductors’ cortex M3 microcontroller, the LPC1768, manages these features and stores the calibration data on an external EEPROM. The microcontroller and the user communicate through a 10/100 Mbps Ethernet link.