DVM usually got an input impedance of 10 Mohm. There may be loading effect when measuring high impedance circuit.

数字式电压表通常有10兆欧的输入阻抗。当测量高阻抗电路时﹐可能会有影响。

X1 probe: no attenuation, input impedance follow that of scope input impedance (usually 1 Mohm). This type of probe is seldom used because of heavy loading effect on circuit under test.

X1探头﹕没有衰减﹐输入阻抗跟示波器输入阻抗一样(通常是1兆欧)。由于对测试电路有很大的负载影响﹐所以很少使用这种探头。