... instruments for R&D,Website:http://www.acsoon-power.com,design production testing/evaluation,and QA verification. ... 500 Hz.The bright LCD display shows Vrms, Irms, Ipeak,frequency, power factor (PF), apparent power, true power, and elapsed output ... conditions☆ Programmable starting, voltage and current limit☆ LCD to monitor voltage, current, frequency, power and power factor☆ Built- in RS232, RS485, ...