ADASH Ltd.
Adash 4400 – VA4Pro
For further technical and contact information visit www.adash.eu, email: [email protected]
41
Lines
value
Number of lines. The correspondent signal time length is displayed
under this item.
Orders
(1/2,1-5), (1-5), (1/2,1-10), (1-10)
Avg
value
averaging number
How the averaging is used depends of type of trigger:
freerun
when the measurement is started, all signals needed for averaging is taken
continuously
external
when the external trigger comes, all signals needed for averaging is taken continuously
without waiting for next trigger
tacho
every signal for averaging is triggered (constant phase)
amplitude
every signal for averaging is triggered (constant phase)
manual
first signal for averaging is triggered manually, next signals are taken freerun
Averaging
linear, peak hold (for spectrum)
linear, maximum, minimum, median (for static values)
Overlap
% value
Overlapping of signals in averaging.
Resolution
When you use the tacho for 1x amp+phase measurement, the choice of resolution is
available. The number of FFT lines must be chosen in the computational procedure. The FFT with fewer lines is
faster and displays results more often. When you select higher resolution (e.g.speed/64), then more lines must
be used and you will wait for results longer time. If you have some considerable spectrum amplitude near the
speed frequency, then you need to select the higher resolution. It eliminates the disturbing influence of the non
speed frequency near the speed.
Example: the speed is 25Hz. The resolution is speed/4, i.e. 6.25Hz. The speed line bandwidth in FFT will be
6.25Hz. It means, that speed line contains all frequencies in the interval (21.875 , 28.125). If any disturbing
frequency is in that interval, then higher resolution must be used.
Frequency
speed, value
the frequency value for phase shift measurement can be entered
manually (value) or can be used the speed frequency from tacho sensor.
Next Meas functions
Copy
copy of selected measurement to the new one
Info
displays measurement properties
Edit
enables changes in measurement properties
Delete
deletes selected measurement
Export to uff exports data of selected measurement to the uff file format (not for all measurement types), the
file is saved to uff folder on VA4_DISC.
If the Actual measurement is displayed then only this data will be exported.
If the saved data are displayed (View Trend) then you can export just one displayed data or all data saved in
memory. The unit asks you Export (All/One)? and then you select the button.
Export to wav exports data of selected measurement to the wav file format (time signal and orbit), the file is
saved to wav folder on VA4_DISC.
Time signal is exported as one file with two channels ( 1ch signal, 2ch trigger).
Orbit is exported as two files ( A and B channels).
before exporting you need to enter the required range of signal in wave file. It enables to obtain better resolution
in file. If the true peak of signal is e.g.8mm/s, then enter e.g. 10mm/s.
Export to csv exports data of selected measurement to the csv file format (see next chapter), the file is saved
to uff folder on VA4_DISC.
