14
8.2.3.
SVT Mode (step voltage tests)
The use of
Η
key allows the MD-5075x setting for the performance of a step
voltage test; when this mode is selected, the display shows the SVT
abbreviation. Under this operation mode, the user does not define a specific
voltage test, but a maximum voltage value the device will start tests
applying a 500V voltage and increase this value in 500V steps each minute
until reaching the programmed voltage. At each stage, the MD-5075x
measures the resistance before advancing towards the following step.
The use of voltage adjusting keys, determines the value of the highest
voltage – which will be, in all cases, a multiple of 500V, up to a 5000V limit.
It is advisable to use the
Κ
key in order to select this value;
Ι
and
ϑ
keys
may be used, but if the selected value is not a multiple of 500, it will be
rounded down. The test result is calculated according to the following
formula:
=
SVT
R
R
V MAX
500
After test ending, the value may be recovered by pressing
Ε
key.
8.2.4.
“Pass / Fail” Test mode
Press
Λ
key in order to determine the lower insulation limit for type “Pass /
Fail” test. Select this value using
Θ
and
Ρ
keys. Possible values are 10M
Ω
,
100M
Ω
, 1G
Ω
or 10G
Ω
.
During a “Pass/ Fail” test, the MD-5075x will indicate when the insulation
resistance is lower than the programmed limit, both with an intermittent BIP
and the
Λ
key led flashing . The
Λ
key led will remain flashing until the end
of tests, or until the measurement of the resistance value is greater than the
programmed limit.
