9
3. INSULATION RESISTANCE M EASUREM ENTS
a)
Turn the function sw itch from the
“OFF” position to the left
（
4000
MΩ/1000V---4000/
MΩ500V---4000
MΩ/250V---1000
MΩ/125V
）
,and chose one of the voltage-block( there are 4 ranges
namely, 4
MΩ40 MΩ400 MΩ4000 MΩ, can be sw itched
automatically for every voltage-block.)
b)
Connect tw o testing lines to the tested
；
c)
Push dow n and hold the
“TEST” button /or press the “ LOCK”
keystoke first and then the
“TEST” button, if the tested is
electriferous and its voltage ( AC/DC) is over 30V, it w ill refuse
w ork and no high-voltage testing occurs, simultaneity, it show s
“>30V” on the LCD, the symbol “ ” flashes, and the buzzer
w arns frequently. if the tested is diselectriferous or its voltage is
low er than 30V, it w ill enter into the formal testing process and
brings the high-voltage. on the primary display, the insulation
resistance in M
Ω is indicated in-phase w ith analog bar; on the
secondary display, the tested insulation voltage in V (DC) is
indicated, the symbol
“ ” flashes and the buzzer warns
frequently
d)
Being free from the
“TEST” button or pushing down the “TEST”
button in the
“LOCK “ status can exit from the “LOCK” status and
shutoff the high-voltage
，
synchronously, the resistance values is
indicated in the primary display w ill be held, and the secondary
display still be in the status of monitoring the insulation voltage for
the tested.
e)
Subsequently, discharge the balance insulation voltage of the
tested through the inner sw itch of the meter.
Turning the function sw itch can exit automatically from testing
status during the process
。
