MEGABRAS MD-5060x Guia Del Usuario página 11

When the selected mode is different from the Normal mode, the led A
flashes in order to warn the operation that the equipment is programmed for
a special test (SVT or with Timer).
LIM. "Pass-fail test"
Allows to program the lower insulation limit in 10 MΩ, 100 MΩ, 1 GΩ or
10 GΩ. By using this key, the megohmmeter will indicate with a BEEP
(intermittent sound) and with an C led when the insulation resistance is
lower than the programmed limit acting, in this case, as a "Pass-fail test"
device. The C led will remain flashing until the test is finished or until the
measured resistance limit is higher than the programmed limit.
Voltmeter
By pressing this key, the equipment will measure the tension effectively
applied to the element being tested.
Memory (HOLD)
It allows to hold the last performed reading on the display, at the moment
this key was pressed, without interrupting the test. When this key is re-
leased, the megohmmeter updates the resistance and time values. The B
led on and the letter H on the display, indicate that the function was acti-
vated.
Filter
When insulation measures are carried out in transformers or in large di-
mension machines, in presence of strong electromagnetic fields, it is possi-
ble that the equipment reading is unstable, especially for resistance values
higher than 300 MΩ. In these cases it is convenient to press the FILTER )
key before starting the measurement. This function allows to reach the
insulation resistance value in an upward curve without significant oscilla-
tions.
Dielectric Absorption Index (DAI)
This key makes it possible to visualize the Dielectric Absorption Index value
on the display. For this kind of tests, the megohmmeter should be con-
nected, applying voltage to the sample for 1 minute (60 seconds). After this
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