Domestic school watches generally use analog pointer watches, including electric series watches, three and a half digit and four and a half digit watches.

Electric power meters require calibration with high power (such as a load current in the 10V voltage range, preferably above 800 mA), and accuracy only needs to be around 0.05%.

In response to the actual situation in China, YS87D programmable multifunctional standard source has been developed. Its price is only one fourth to one tenth of that of imported machines, with a maximum accuracy of 0.02%.

Basic error, rise and fall variation, linearity and other calibrations can be performed on AC/DC voltage and current pointer meters and digital meters below level 0.1 according to the electricity meter calibration regulations,

The error and output power can be directly read and set arbitrarily within its resolution range. It can also perform dot grid and sweep inspection on the pointer meter to check the needle sticking situation. It is currently the only programmable multifunctional standard source available for electric pointer meter calibration at home and abroad.

The instrument has self calibration function and is equipped with interfaces and advanced and reliable self-protection circuits.

Suitable for automatic or manual calibration systems of AC/DC voltage, current pointer meters, and digital meters, and can also be used as standard signal sources for AC/DC voltage, current, and resistance.