4.2.6　Analysis and questions

(1)What problems should be paid attention to when measuring the internal resistance of the gauge head by the median method and the substitution method?Is there any other way to measure the internal resistance of the gauge head?

(2)How to refit the gauge head to a multi-range voltmeter or ammeter?(https://www.daowen.com)

(3)Why is the scale of the ohmmeter uneven?Why is the ohmmeter zeroed every time it is used?What are the consequences if the voltage of the battery installed in the ohmmeter is not within the power supply range of the ohmmeter?