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一台完好的UJ33a直流电位差计,因工作电池使用时间较长,调不出工作电流。当换上六节新电池后,在校准工作电流时,奇怪地发现:即使把工作电流调节旋钮旋到底,也无法使检流计指零。这时,千万不要以为电位差计出了故障,而随便拆卸电位差计。解决的办法是:用两节原来的旧电池代替新电池(或者用四节旧电池代替新电池),这样一来工作电流就能调节了。这是为什么呢?根据UJ33a直流电位差计的要求,它的工作电压为2.7～3.4V,也就是说两节1.5 V的电池串联就能满足这个要求。但UJ33a的总工作电流为3mA,因此需要用六节一号电池(即两节串联后再互相并联)才能满足要求。当换上六节新电池后,因
A good UJ33a DC potentiometer, due to the working battery is used for a long time, can not adjust the working current. When replacing a new six-cell battery, when calibrating the operating current, it was strange to find that the galvanometer can not be zeroed even though the operating current adjustment knob is turned all the way down. At this time, do not think of potential difference as a fault, and casually disassemble the potentiometer. The solution is to replace the new battery with two older batteries (or replace the new battery with four batteries) so that the operating current can be adjusted. This is why? According to UJ33a DC potentiometer requirements, it’s operating voltage of 2.7 ~ 3.4V, which means that two 1.5 V battery in series to meet this requirement. However, the total operating current UJ33a 3mA, so the need to use six batteries on the 1st (that is, two in series and then parallel with each other) to meet the requirements. When replaced by six new batteries, due