Elmo HARmonica, HARSFEN0602 - page 99

HARSFEN0602
RG=1 means that a new sample shall be taken once per time quantum. If TS=60, and
RP[0]=0, the recorder will sample once per 240usec.
RG=2 means that a new sample shall be taken once per two time quanta. If TS=60, and
RP[0]=1, the recorder will sample once per 120usec.
Similarly, RG=N means that a new sample shall be taken once per N time quanta.
Note that RG specifies only the recorder sampling-rate, not the trigger sampling-rate. A
trigger event will cause the recorder to start within one time quantum.
RL defines the number of maximal data items to collect.
For example, if RL=11, TS=60,RG=1, RP[0]=0, then the 11 samples at the rate of 240usec
shall be taken, lasting secu240)111(×− = 2400usec.
The recorder has a limited memory – total of 8kb. When more signals are recorded, less
memory is available for each recorded signal.
If )signalsofnumber/()memoryrecorder(RL >, the recorder will fail to record the
specified RL samples – instead it will record to fill its data volume.
The actual amount of recorded data can be polled using WI[21].
8.5 Trigger events and timing
The recorder is started by a trigger event.
The trigger event may be one of the following:
Immediate: The recorder starts immediately after the recording request has been
issued.
Motion begin: The recorder is triggered by the execution of a software BG
command, or by timed BG command, or by a hardware commanded hardware
begin.
Triggered by an analog signal: The recorder starts upon the following event:
o Positive slope – The signal crosses a prescribed level with positive
slope
o Negative slope – The signal crosses a prescribed level with negative
slope
o Window – The signals exits a window of two prescribed signal
levels.
The picture below depicts the positive slope, negative slope, and window trigger types.
1 2 3 4 5 6 7
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
Trigger signal (not necessarily
recorded)
Level 1
The trigger
will
occur here if set
for negative slope
The trigger
will
occur here if set
for positive slope
Level 2
The trigger
will
occur here if set
for window