黑龙江省计量科学研究所和省计量仪器实验工厂共同研制成准确度为千分之五的UJB—2型直流比较电位差计,并已通过鉴定。 UJB—2型直流比较仪电位差计是利用直流比较仪原理制成的测量直流电压和直流电动势的精密仪器。它可以作为检定直流电位差计、直流数字电压表和直流标准电压源等精密仪器的高精度计量标准。该仪器结构新颖,采用数字显示,具有限量宽、低零漂和噪声,操作使用和清数方便等特点。其主要技术指标如下: Heilongjiang Institute of Metrology and Provincial Institute of Metrology Instruments jointly developed a precision of five thousandths of UJB-2-type DC comparator potentiometer and has passed the identification. UJB-2 DC comparator potentiometer is the use of DC comparator principle to measure the DC voltage and DC electromotive force of the precision instruments. It can be used as a verification DC potentiometer, DC digital voltmeter and DC standard voltage source precision instruments such as high-precision measurement standards. The novel structure of the instrument, the use of digital display, with limited width, low drift and noise, operation and use of clear and convenient features. The main technical indicators are as follows: