5.3 Recording limits for Acqiris digitizers
The 89600 VSA software allows the acquisition of long records to be captured. Analysis is done as a
Prior to taking a recording, live test measurements of Main Time length are usually made at the desired span. Then, when the recording is made, the analyzer no longer uses Main Time Length but, instead, uses Recording Length to determine length of the acquired record.
When making an 89600 VSA recording the maximum recording length is determined by the digitizer sample rate and memory depth. When in user rate the maximum record- ing lengths will increase as the sample rate decreases. The recording length increase is directly proportional to the sample rate decrease or the memory depth increase. The following table indicates the maximum recording length at full rate for each supported digitizer.
Table 6. Maximum recording lengths at maximum span for each digitizer model with memory
Model | No. of | Max span | Recording length for possible memory configurations |
|
| |||||||
| Ch's |
|
|
| 512k | 1M | 4M | 8M | 64M | 128M | 512M | 1G |
1 | 100 | MHz | − | − | 10 ms | 20 ms | − | − | − | − | ||
2 | 100 | MHz | − | − | 10 ms | 20 ms | − | − | − | − | ||
1 | 164 | MHz | – | – | 10 ms | 20 ms | – | – | – | – | ||
2 | 164 | MHZ | – | – | 10 ms | 20 ms | – | – | – | – | ||
1 | 78.125 | MHz | − | − | 20 ms | 40 ms | − | − | − | − | ||
2 | 78.125 | MHz | − | − | 20 ms | 40 ms | − | − | − | − | ||
1 | 2 GHz |
| − | 130 μs | − | − | − | 16 ms | − | 130 ms | ||
1 | 2 GHz |
| − | 130 μs | − | − | − | 16 ms | − | 130 ms | ||
2 | 1.5625 | GHz | 130 μs | − | − | − | 16 ms | − | 130 ms |
| ||
1 | 2 GHz |
| − | 130 μs | − | − | − | 16 ms | − | 130 ms | ||
2 | 1.5625 | GHz | 130 μs | − | − | − | 16 ms | − | 130 ms | − | ||
Note: The stated recording depths are at maximum sample rate. Lower user sample rates give proportionally longer times.
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