SPM leonova emerald - Page 140

E
E:18 Vibration measurement
Trigger selection
Thetriggerfunction(2)canbeset‘Posttrigger’
or ‘RPM trigger’. ‘Post trigger’ is primarily used for
measuring in rolling mills.
-‘TriggerLevel’(3)issettoactivatemeasurement
when the vibration/rpm level exceeds/falls below
the set value.
-“Delaytime”(4)isadelayinsecondsbeforethe
measurement begins after the ‘Trigger level‘ is
exceeded.
-‘‘RPMtriggertype”(5)canbesetto‘RPMrunup’
or‘RPMrundown’(6).Themeasurementbegins
when the rpm exceeds respectively falls below
the set trigger level.
2
3
5
4
6
Zoom centre and zoom factor
Truezoom(1)isselectedtogetahighresolu-
tion around a selected ‘centre frequency’. This
frequency must be within the selected frequency
range. Thus, to zoom in on 600 Hz, the minimum
range is 0 to 1000 Hz. The zoom factor can be set
to 2, 4, 8, 16, 32 or 64. The range covered by the
zoom is ‘upper frequency range/zoom factor’. Thus,
with a zoom factor of 8, the spectrum will cover the
range 537.5 - 662.5 Hz.
The highest possible zoom corresponds to a 12800
line spectrum. For this, combine the lowest number
of spectrum lines, 400, with a zoom factor of 32
(32x400=12800).Withacentrefrequencyof600
Hz, you will get a spectrum over the range 584.375
to 615.625 Hz, with a resolution of 0.078125 Hz.
When using the optional function ‘Order tracking’
the zoom centre frequency is set in orders.
1