Elmo HARSFEN0602, HARmonica software manual Trigger events and timing

HARSFEN0602ElmoHARmonicaSoftwareManual		PRELIMINARYDRAFT
RG=1 means that	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	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 (11−1) × 240u sec = 2400usec.

The recorder has a limited memory – total of 8kb. When more signals are recorded, less memory is available for each recorded signal.

If RL > (recorder memory) /(number of signals) , 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
0.8	Trigger signal (not necessarily
0.6		Level 1
0.4	The trigger
		The trigger
0.2	occur here if set
		occur here if set
	for negative slope	for positive slope

0

			The trigger
-0.2			occur here if set
			for window
-0.4			Level 2
-0.6
-0.8
-1	2	3	4	5	6	7
1

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