M-system 73VR3100 User Manual page 11

EVENT RECORDING
In the event recording mode, the 73VR3100 detects an external event by trigger signal, and stores preset number of
samples (max. 1200 respectively) before and after the moment of event.
With an analog trigger, the trigger signal is continuously compared with a preset threshold, and the 73VR3100 initi-
ates recording when it is in a pre-determined condition (higher or lower than the threshold).
With a discrete trigger, the signal logic state is continuously monitored, and the 73VR3100 initiates recording when
it is turned to a pre-determined state (ON or OFF).
n Trigger Conditions for Analog
Value > Threshold
Value < Threshold
Value ≥ Threshold
Value ≤ Threshold
n Trigger Conditions for Discrete
Up Rising pulse edge
Down Sinking pulse edge
How to Set the Event Recording
Figure 2.3.2b. Event recording setting, analog.
1. Storing setting: Pull down the arrow to the right of Storing Field and select Event recording. Choosing the Event
recording on the Data storing method view changes the subsequent menu items to those suitable for the event
recording mode.
2. Discrete / Analog: Choose a type of trigger signal.
Discrete Contact signal trigger
Analog Analog signal trigger
3. Threshold: For analog signals, set a threshold in an engineering unit value.
Threshold
4. Condition: Choose among the aforementioned options.
5. Pen number: Choose a pen to be designated as trigger.
6. Pretrigger / Posttrigger: Specify numbers of samples to be stored before (Pretrigger) and after (Posttrigger) the
event respectively.
Pretrigger Number of pretrigger
samples
Posttrigger Number of posttrigger
Data recording is initiated when the trigger input signal value
goes above the threshold setpoint.
Data recording is initiated when the trigger input signal value
goes below the threshold setpoint.
Data recording is initiated when the trigger input signal
values is equal to or goes above the threshold setpoint.
Data recording is initiated when the trigger input signal
values is equal to or goes below the threshold setpoint.
Data recording is initiated at a rising edge of the trigger input
pulse.
Data recording is initiated at a sinking edge of the trigger
input pulse.
Figure 2.3.2c. Event recording setting, discrete.
A discrete signal triggers recording.
An analog signal triggers recording.
Engineering unit value. Max. 6 digits including decimal
point and minus (–) sign. 'e' is used to set an exponential
value.
Max. 1200 samples. Pretrigger recording is NOT applicable
with the storing intervals set to 2 seconds or longer.
Max. 1200 samples.
samples
73VR31BLD USERS MANUAL EM-7397-C Rev.4 11