Mastech MS5201 - Operating Instructions and Measurement Guide

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4. OPERATING INSTRUCTION
4.1 SWITCH DISLOCATION ALARM
When using for measuring AC voltage, DC voltage, resistance and continuity
test, you must rotate the function switch to “200Ω
,1000V , 700V~” ,
rotate the range switch to “ 200Ω
 700V~  1000V ” ; measuring
insulation resistance, you must rotate the function switch to “MAUN.LOCK
1min.LOCK 2min. LOCK 4min” . Otherwise, the inside alarm system will
give out a humming sound per two seconds. The indicator shows random
reading.
4.2 SOUND AND FLASH ALARM
In insulation range, the test button is pressed, the inside alarming system will
send out a humming sound per two seconds, also the right red high voltage
output indicator of the LCD flashes.