Tonghui TH2822D, Instruction Manual

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Clear Functions (CLEAR)
There are two functions under CLEAR: Open Clear
and Short Clear. Clear can decrease the distributed
error caused by test leads, for instance, short clear
can reduce the effects of contact resistors and test
leads and open clear will minimize the influence of
distributed capacitors and resistors on testing high
impedance elements.
Enter Clear Mode
For convenience, open clear and short clear are
designed to share a button. By pressing the CLEAR
button, the meter will automatically choose either
open clear or close clear.