UT521 USERS MANUAL
14
press"TEST"button, the button's light will be on, which shows the Tester is in
measurement.
(Note:when C or E does not connect properly, auxiliary earth resistance or earth
resistance excess the load (like 20 excess around 14K ),or testing terminal open
circuit,LCD display will show"- - - - ",then it need to double check the connection
parts, whether soil is too dry, whether auxiliary earth stakes is close to earth.)
When the earth resistance testing point over the selected measuring range,
meanwhile the selected 20 position less than around 14K , or 200
position less than around 26K , or 2000 position less than around 78K ,LCD
display will show "OL"(overload). Warning:If the auxiliary earth stake is banning
or touch the other materials, it will affect the reading. When connect the test leads,
it must clean the auxiliary earth stake. If the auxiliary earth stake value is too large,
it also cause the deviation in reading.
d. The tester should be switch - on when press the button and select the function
key.Auto switch off after around 10 minutes for power save(except earth resistance
testing function on).
e. Backlight on:while testing in poorly lighted area, it needs backlight press
"Light/Load"button,backlight function will be on and LCD display the corresponding
sign. Press"Light/Load"button again, then it will switch-off backlight function.
