EL5100S型计算器有A、B、…、J 等十个字母键,可编80个字符以内的程序,并具有改错和储存等功能。该机右下角黑键系应用选择键,当黑键置于“AER”档时,便可编程序;置于“COMP”档时,可进行一般计算和程序运算。该计算器在山区35千伏输电线路施工中使用,大大提高了工效。现仅以盘左观测为例介绍如下。 EL5100S calculator has A, B, ..., J and other ten alphabet keys, can be programmed within 80 characters, and has features such as error correction and storage. The black key at the bottom right corner of the machine is the application of choice keys, when the black key is placed in the “AER” file, you can program; placed in the “COMP” file, the general calculation and program operations. The calculator is used in the construction of 35 kV transmission line in mountain area, which greatly improves the work efficiency. Now take the disk left observation as an example to introduce as follows.