以下是关于CD770数字万用表的产品中英文介绍：

CD770数字万用表是日本三和（SANWA）推出的一款紧凑型数字万用表，专为工业电气现场工作人员设计，能够满足多种测量需求。它采用坚固耐用的设计，外壳保护套使用抗撞击的合成橡胶，即使在跌落的情况下，也能有效保护仪表。该万用表具备大数码的大屏幕液晶显示屏，文字清晰易读，3-3/4位4000数据显示，最高精度可达0.5%。它能够测量交直流电压、交直流电流、电阻、电容、频率等多种参数，并且具有通断检查蜂鸣器功能，当测量对象导通时会发出蜂鸣声。此外，还具备数据锁定、量程锁定、相对值模式等功能，方便用户观察和记录测量数据，排除测试导线对测量数据的干扰。标配镀金表笔，防腐、防接触不良，进一步提高了测量的精度。自动省电模式（30分钟）可取消，有助于延长电池寿命。电流测试端子配备防误插安全帽，提升了使用的安全性。其频带宽度为40-400Hz（正弦波），抽样率为3次/秒。

The CD770 digital multimeter is a compact digital multimeter launched by SANWA of Japan, designed specifically for industrial electrical field workers to meet a variety of measurement needs. It features a robust and durable design with an outer protective cover made of impact-resistant synthetic rubber, which can effectively protect the instrument even in the event of a drop. The multimeter is equipped with a large-screen LCD display with large digits that are easy to read, and it provides 3-3/4 digit 4000-count display with a maximum accuracy of 0.5%. It is capable of measuring various parameters such as AC/DC voltage, AC/DC current, resistance, capacitance, and frequency. Additionally, it has a continuity check buzzer function that sounds when the measured object is conductive. The device also includes functions like data hold, range hold, and relative value mode, which facilitate the observation and recording of measurement data and eliminate the interference of test leads on the measurement results. It comes with standard gold-plated test leads, which are corrosion-resistant and prevent poor contact, thereby further enhancing the accuracy of measurements. The auto power-off mode (30 minutes) can be canceled to help extend battery life. The current test terminal is fitted with a safety cap to prevent incorrect insertion, enhancing the safety of use. The bandwidth is 40-400Hz (sine wave), and the sampling rate is 3 times per second.