3M CTM051 Manuale d'uso - Pagina 12
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Using Reference with EMI
Reference mode is helpful if you wish to
hear an audio alarm whenever the EMI
signal exceeds a certain level. In order to
use this mode, depress the REF button while
in any of the EMI screens. You should see
the REF indicator at the top of the display.
The bottom line of the display will now
show the reference value of the average
signal instead of the peak value of the signal.
Adjust the reference level using the Up and
Down arrow buttons. Now whenever the
average value of the EMI signal exceeds this
reference level, an audio alarm will sound.
By depressing the REF button again, you
can adjust the reference level for the peak
signal as shown on the right.
Hold Function
Pressing the Hold button once while in any
measurement mode will cause the 3M
Ground Pro Ground Integrity Meter to enter
the Hold mode. The display will freeze,
showing the value at the moment the button
was pressed. Pressing the Hold button
a second time the display will show the
maximum value of the signal accumulated
from the moment of pressing the button.
Please note that if you power down the
Ground Pro while in any of these modes,
it will collect the maximum value of the
measured parameter for as long as this mode
11
0
2
REF
™
0
2
0
2
0
2
EMI
Ref.
AVG
PEAK
Normal
V
measurements
screen
V
4
AVG
PEAK
Peak value
V
4
Average
AVG
value
V
V
4
Hold
AVG
PEAK
Normal
V
measurements
screen
V
4
HOLD
AVG
PEAK
V
Screen is frozen
V
4
HOLD
MAX
AVG
PEAK
Max. signal values
V
are shown
V
4