这是仪准确度s，我国划分为0.1 0.2 0.5 1.0 1.5 2.5 5这几个等级。如果仪表的最大引用误差不超过s%，那该仪表的准确度就是s，s如果结余以上划分的区间内按低等级计算。
引用误差s%=示值误差/测量范围上限
示值误差=测量值-真实值
以上你说的4又5/6 4又3/4都该归到5这一等级。 4又5/6 4又3/4差的不多如果测量没有硬性严格要求不用考虑那个错哪个对。
#include?<reg52.h>
unsigned?char?code?dispbitcode[]={0xfe,0xfd,0xfb,0xf7,
?????0xef,0xdf,0xbf,0x7f};
unsigned?char?code?dispcode[]={0x3f,0x06,0x5b,0x4f,0x66,
????0x6d,0x7d,0x07,0x7f,0x6f,0x00};
unsigned?char?dispbuf[8]={10,10,10,10,0,0,0,0};
unsigned?char?dispcount;
unsigned?char?getdata;
unsigned?int?temp;
unsigned?char?i;
sbit?ST=P3^0;
sbit?OE=P3^1;
sbit?EOC=P3^2;
sbit?CLK=P3^3;
void?main(void)
{
?ST=0;
?OE=0;
?ET0=1;
?ET1=1;
?EA=1;
?TMOD=0x12;
?TH0=216;
?TL0=216;
?TH1=(65536-4000)/256;
?TL1=(65536-4000)%256;
?TR1=1;
?TR0=1;
?ST=1;
?ST=0;
?while(1)
?{
?if(EOC==1)
?{
??OE=1;
??getdata=P0;
??OE=0;
??temp=getdata*235;
??temp=temp/128;
??i=5;
??dispbuf[0]=10;
??dispbuf[1]=10;
??dispbuf[2]=10;
??dispbuf[3]=10;
??dispbuf[4]=10;
??dispbuf[5]=0;
??dispbuf[6]=0;
??dispbuf[7]=0;
??while(temp/10)
??{
??dispbuf[i]=temp%10;
??temp=temp/10;
??i++;
??}?
??dispbuf[i]=temp;?
??ST=1;
??ST=0;
?}
?}
}
void?t0(void)?interrupt?1?using?0
{
CLK=~CLK;
}
void?t1(void)?interrupt?3?using?0
{
?TH1=(65536-4000)/256;
?TL1=(65536-4000)%256;
?P1=dispcode[dispbuf[dispcount]];
?P2=dispbitcode[dispcount];
?if(dispcount==7)
?{
?P1=P1?|?0x80;
?}
?dispcount++;
?if(dispcount==8)
?{
?dispcount=0;
?}?
}
