2-32
IM AQ7280-01EN
Explanation
In normal measurement, the sampling interval is set so that data can be sampled at all distances
according to the specified distance range. The maximum number of data samples on the AQ7280 is
256000 (when the distance range is 512 km).
Therefore, if the distance range is large (e.g., 400km), the sampling interval becomes long, and events
occurring between samples cannot be analyzed in detail. Waveform zooming explained in section 3.3
simply expands the measured results at the sampling resolution set for each distance range; it does
not increase the resolution.
400 km, 50000 (sampling interval of 8 m)
Coarse when expanded
Example: 20 km, 10000 (sampling interval of 8 m)
In high resolution measurement, you move the cursor to the location where you want to analyze in
detail and set the sampling resolution. The sampling resolution that you can select here is all intervals
regardless of the distance range. The measurement scope is determined by the selected sampling
resolution with the cursor at the center. If there is no cursor, the left edge of the present measurement
scope becomes the reference.
4 km, 200000 samples
Sample at fine resolution from the beginning
Example: 4 km, 200000 samples
4 km, 200000 samples
Sampling interval
of 2 cm
2.6 Performing High Resolution Measurement