METREL MI 2088 User Manual page 28

MI 2088 Earth –Insulation Tester
•
Check resistances of current and potential probe pressing the DISPLAY key. rP
and then value of potential probe will be displayed, automatically followed by rC
and then value of current probe. After a while, main result will automatically be
displayed again.
•
Store displayed result for documentation purpose, see instructions how to store
it in chapter 4.1. Storing of test results .
Notes!
•
In case of present external voltage higher than 19 V a.c./d.c. between H and E
or ES and S test terminals, the Earth Resistance measurement will not be
carried out after pressing START key, but the voltage will be displayed, equiped
with "!" mark! Beep warning sound will be effected too!
• If resistance of current or potential probe is too high (>(4 k Ω + 100 R
kΩ, whichever is lower), test result will be equiped with "!" mark and rC or rP
message. If resistance of both (current and potential) probes is too high, rCP
message will be displayed.
•
If test result is out of measurement range (open test leads), >1,99 kΩ message
will be displayed!
•
If the current, measured with clamp, is lower than 0,5 mA, LC (low current)
message will be displayed, indicating test result may not be correct (the result is
still correct, if Rtot./Rpart. < 100).
Where:
Rtot. ............... Total Earth Resistance, measured when function switch is in R
position.
Rpart. .............. Partial Earth Resistance, measured with clamp, when function switch
is
in R
•
In case of present noise current higher than approx. 2,4 A in clamp loop, nC
(noise current) message will be displayed, indicating test result may not be
correct! The value of noise current may be also measured in CURRENT
function.
•
bat message, displayed during or after finishing the measurement, means,
batteries are too weak to guarantee correct result. Replace the batteries.
(clamp) position.
EARTH
Measurement instructions
28
) or >50
E
EARTH