What is the input impedance of a multimeter
When measuring voltage, the instrument should have a high input impedance, so that the current drawn from the circuit under test is very small during the measurement process, which will not affect the working status of the circuit under test or the signal source, and can reduce measurement errors.
For example: The input resistance of the DC voltage range of a 31/2-digit handheld digital multimeter is generally 10μΩ. The AC voltage file is affected by the input capacitance, and its input impedance is generally lower than that of the DC voltage file.
When measuring current, the instrument should have a very low input impedance, so that the influence of the instrument on the circuit under test can be minimized after being connected to the circuit under test. However, when using the current range of the multimeter, it is easier to Burn out the meter, please pay attention when using it.
