Why is the first scale on the pressure gauge smaller than the others?

I really hadn’t paid attention to this issue before; I did a search on Baidu. The most basic standard for pressure gauges is GB1226. According to this standard, the scale markings on a pressure gauge are evenly distributed over 270 degrees, with long markings, medium markings, and short markings. The arrangement of these markings as well as the value represented by each small interval are all specified in detail in GB1226. The first major division on a pressure gauge dial is not necessarily a few degrees lower than the subsequent divisions. On a dial with stop pins, the first major division is always a few degrees smaller than the subsequent divisions, and this is due to the zero-offset effect. According to GB1226 standards, the degree of this zero-offset for dials with stop pins should not exceed 270° × 1.6% = 4.32 degrees; hence, the first major division on such dials is indeed a few degrees smaller than the others. On dials without stop pins (those used for measuring positive/negative pressures or electrical signals), there is no such zero-offset, so the first division is not smaller than the subsequent ones.

Because turtles need to retract their heads; it feels good to do so, {:3_51:}

The stop pin is taken into account in the table’s maximum allowable error

The stop pin is taken into account in the table’s maximum allowable error

It’s often unreliable, which is why a stop pin is installed – it’s like putting a chain on a Blackback Mastiff, or wearing a mask on a donkey or horse. . Only a cheap watch would have a stop pin! For sensors, won’t a stop pin be installed? . .

Good watch, the hands just stop wherever they want to – it doesn’t stop at all.

For watches, isn’t a stop pin used? Broken pressure gauge; ugly ghosts create chaos; put down the pen, oh De.