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LM124: 单电源,在共模范围内,测试CMRR

Part Number: LM124
Other Parts Discussed in Thread: LM158

根据答案datasheet 提供的共模输入范围0-3.5V ,测试CMRR,条件为当VCC=+5V 单电源供电时候,将IN+ =IN- =3.5V 输入,G=10, 为什么输出的电压非常大,有660mV 左右, 最终计算的CMRR 将会非常小,请帮忙解释一下单电源怎么测试CMRR?
当in+ =in-=3.5V,vo=660mV
当IN+=IN-=0V,vo=20mV 
-->计算CMRR 40DB ,目前想来了解,单电源如果测试CMRR ,为什么同样测试方法,LM158 测试非常良好呢。问题出在哪里,非常希望得到您的support