ION7650 sampling cycle and waveform capturing

[sesa47073_bridg]

Hi, may I know the following information on ION7650 regarding the sample per cycle?

1) How many waveform can we capture per channel if we set the capturing to be 1024 sample per cycle?

2) How many pre-event waveform and post-event waveform we can capture with 1024 sample per cycle?

3) Based on 10MB memory, how many waveform can we store inside the ION7650?

Thanks,

John

[Yut]

The format will be 1024X2 means you can set post event cycle only 1 because you can record only 2 cycles.

The waveform depth will determine how many waveforms you can record before the first be overwritten.

In practice I recommend that the ION7650 should be always online to the server some disturbance cause a lot of PQ events for example when there was thunder storm we used to picked up the disturbance in number of 100+ (we lost some waveform but at least the sag/swell and transient logger still logged all).

[sesa47073_bridg]

Thanks K.Yut. May I know how do I determine the waveform depth?

Do you have experience where you have captured all the voltage and current waveform on 1024 sample per cycle for about 1-2 minutes continuously?

Based on the document below, does it mean that the maximum cycles captured is 214,000 for all 16, 256, 512 and 1024 sample/cycle?

Thanks.

[Hal_Etheridge · Accepted solution]

One thing you can do is trigger the same waveform recorder multiple times to record back-to-back waveforms if you want to capture a longer period of time.  They will appear as different waveforms in the SW database but you can graph them on the same screen if needed to see any patterns, etc. There are likely multiple ways to do this with ION module glue logic but a few one-shot timers going through a pulse merge module to the record now input is one possible method that should work.

The maximum size waveform (due to current ION protocol limitations) is 2048 samples.  This limit is unrelated to the sampling rate - the value of samples/cycle * cycles must be <= 2048 (this is enforced by the list of allowed sampling rate setup register values in the WRE module).