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tacho
signal (usually like TTL) which contains one pulse during one rotation of the shaft. It can be also understood like
series of single external pulses. The taking of measured data begins, when the external signal (voltage level
higher then defined Tacho Trig Level in tacho sensor) appears on the trigger input (the same like external
item).
Pretrig (%)
value in (100,-100) or user
exactly from the trigger moment. But in some applications you are interested also to know the signal before
trigger. The required time should be define in seconds, but in signal Analyzers is usually defined as percent part
of the total signal length. When 1 second time signal is measured and pretrigger=25, then 0,25s will be taken
before trigger and 0,75s after trigger. Also the negative pretrigger could be used. It means that the time signal
will be taken later then trigger pulse.
Ampl Trig Channel
Ampl Trig Level (unit)
section). The unit is the unit of sensor on selected channel (Ampl Trig Channel).
External Trig Edge
External Trig Level[V] See the description in Trigger Source/ external
Global Settings
The underlined values are the default values (factory settings).
Display Route Values on,off When you want to go faster during the route and you do not want to look at
measurement results after each point, then set it off.
Route Autosave
itself. When set to off, then the user after results confirmation has to save it manually ( by Save button)
Check Route Sensors yes, no
Each point in the route contains the sensor setting, which is defined in DDS. The instrument contains also the
sensors setting (Sensors button). Both settings are compared for each point during the route readings. When
the sensor setting in point is not equal the sensor setting in instrument, then the Used sensor window appears.
It is the warning to the user.
For further technical and contact information visit www.adash.eu, email: info@adash.cz
The tacho is special case of external trigger. When we talk the tacho, we mean the
( 1,2,3,4)
The number of channel, which will be used for amplitude triggering.
value
rising, falling edge for triggering
on,off when set to on, the data are saved after taking measurement at each point by
Usually the taking of measurement (e.g. time signal) begins
See the description of amplitude mode (Trigger Source
25
Adash 4400 – VA4Pro
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