Dy/Dt Triggering - HBM Genesis GEN5i User Manual

560
G.2

dY/dT Triggering

Basic setting definitions:
dY: The result of substracting two ADC values
dT: Specifies the time between the two samples substracted
These two setting values are independent from each other. So the user needs
to specify both explicitly for the trigger unit to do a correct job. Perception, nor
the GEN series can recalculate the 2 settings to extract a useable setting. It is
the user that needs to specify both settings within limits that the GEN series
can use.
Notes on setting definitions:
dY: Specified in technical user units so scales with changes of technical
units. Maximum dY depends on your amplifier range and technical unit
scaling. Perception might turn the background yellow to inform you a
change in the amplifier settings is required to be able to actually
generate a trigger for you. Say amplifier is set to 100 V range and dY
of 110 V can never be measured with this sensitivity. However applying
a technical unit multiplier of 10 or decreasing the amplifier sensitivity
to 200 V range both would make this setting valid. Do not expect
Perception to re-calculate the dY/dT of 110 V/10 ms to be recalculated
to 55 V/5 ms. What choice should Perception make here 11 V/1 ms
would also be possible. But this leads to completely different trigger
behavior as the noise sensitivity goes down from 110 V to 11 V and
this might not be what you want.
dT: Specified in seconds, used in samples. Setting is samplerate
dependant. Maximum dT in samples is 1023. For user convenience we
allow entry in time. But the hardware works in samples. Therefore
changing samplerates might make your setting unusable. Eg.
1023 ms is OK as long as the samplerate is 1 kS/s. At 1 MS/s the
maximum dT time is 1.023 ms.
Whenever a dT is not useable with the selected samplerate the
background of this setting will turn yellow within Perception (Perception
indicates this setting is not valid with the current settings that are
dependant for this setting).
Remember:
Always specify your requested dY and dT values the way you expect GEN
series to look at your signals.
GEN5i
I2679-4.0 en